JP4986938B2 - Apparatus, method and program for calculating total weight of fissile elements in nuclear reactor - Google Patents

Description

  The present invention relates to an apparatus, a method, and a program for calculating a loading amount of a fissile element in a nuclear power reactor using a boiling water reactor.

  In order to ensure public safety while ensuring the use of nuclear energy for peaceful purposes, the national government has various regulations regarding the installation, operation, and disposal of nuclear power plants. In other words, operators who own nuclear power plants are obliged to notify the Minister of Economy, Trade and Industry every year in accordance with the laws and regulations, and in this operation plan, uranium, plutonium, etc. present in the reactor The total weight of fissile elements must also be stated. Therefore, electric power companies with nuclear power generation facilities must make calculations to predict the total weight in the furnace for each fissile element such as uranium and plutonium every year.

  In nuclear power generation using a boiling light water reactor so far, in addition to the amount of nuclear fuel burned during the period determined from the amount of generated power, taking into account the state in the reactor such as the void ratio indicating the amount of bubbles generated in the cooling water, The total weight of fissile elements in the furnace was calculated for each fuel type.

  However, in the nuclear reactor, the burning method of nuclear fuel is different between the central part and the peripheral part of the reactor, the burning method is also different between the new nuclear fuel and the old nuclear fuel, and the burning method is also different depending on the amount of nuclear fuel in the nuclear reactor. Different types of nuclear fuel burn, the type and amount of fissile material produced will vary accordingly, but so far the calculation of the total weight in the reactor for each fissile element takes these differences into account. I couldn't.

Incidentally, for example, Patent Document 1 discloses an apparatus and method for observing the amount of fissile elements present in nuclear fuel when the nuclear fuel is burned and observing the amount of neutrons and calculating based on the result. .
JP-A-7-181283

  In order to solve such a problem, the present invention predicts the total weight of each fissile element in a nuclear power reactor using a boiling water reactor. A device and method that can calculate more accurately by taking into account the peaking rate indicating the ratio of the burnup increment and taking into account the position of the nuclear fuel in the reactor, the old and new of the nuclear fuel, and the amount of the nuclear fuel in the reactor And to provide a program.

1st invention calculates the total weight of the fissile element in the nuclear reactor of the said nuclear power plant at the time of the end of the said predetermined period when the nuclear power plant using a boiling water light water reactor is carried out electric power generation operation for the predetermined period A device,
CPU and memory;
A storage area provided in the memory, which is a generated power amount storage unit, a thermal efficiency storage unit, an in-furnace total weight storage unit, a peaking rate storage unit, a fuel type initial combustion degree storage unit, a fuel weight ratio composition rate storage unit, and Fuel body weight storage section by fuel type ;
Incremental burnup calculation unit realized by executing a program stored in the memory by the CPU, incremental burnup calculation unit by fuel type, end burnup calculation unit by fuel type, each element composition by fuel type A rate calculation unit, a weight calculation unit in each element furnace by fuel type, and a total weight calculation unit in each element furnace ,
With
The generated power amount storage unit stores the amount of power generated by the nuclear power plant in the predetermined period,
The thermal efficiency storage unit stores thermal efficiency when the nuclear power plant operates at a rated output,
The total reactor weight storage unit stores the total weight of fissile elements contained in nuclear fuel loaded in the reactor at the beginning of the predetermined period,
The incremental burnup calculation unit includes the generated power amount stored in the generated power amount storage unit, the thermal efficiency stored in the thermal efficiency storage unit, and the total of fissionable elements stored in the in-furnace total weight storage unit. Based on the weight, the burnup increased in the predetermined period by the power generation operation,
The peaking rate storage unit stores the peaking rate for each nuclear fuel type used in the reactor with respect to the incremental burnup of the entire reactor,
The incremental burnup by fuel type calculation unit increments by nuclear fuel type in the reactor based on the incremental burnup calculated by the incremental burnup calculation unit and the peaking rate stored in the peaking rate storage unit. Calculate the burnup,
The initial burnup storage unit by fuel type stores the burnup by nuclear fuel type in the reactor at the beginning of the predetermined period,
The fuel Type end burnup calculation unit, and the nuclear fuel by type of incremental burnup calculated by the fuel Type incremental burnup calculation unit, of the predetermined period stored in the fuel Type beginning burnup storage unit Based on the burnup for each nuclear fuel type in the reactor at the beginning of the period, the burnup for each nuclear fuel type in the reactor at the end of the predetermined period is calculated,
The fuel weight ratio composition ratio storage unit stores the composition ratio of fissile elements per unit weight of nuclear fuel according to the burnup at a predetermined void ratio,
Each elemental composition ratio calculation unit for each fuel type includes a burnup ratio for each nuclear fuel type calculated by the end-of-fuel ratio calculation unit for each fuel type, and a composition ratio stored in the fuel weight ratio composition ratio storage unit. Based on the fuel type, calculate the composition ratio of each fissile element per weight contained in the nuclear fuel in the reactor,
The fuel type-specific fuel body weight storage unit stores the weight of the fuel type-specific fuel body installed in the nuclear reactor,
Each element type weight calculation unit for each fuel type is stored in the fuel type weight for each fissile element calculated by the element composition rate calculation unit for each fuel type and the fuel body weight storage unit for each fuel type. The weight of each fissile element contained in the nuclear fuel in the reactor is calculated for each fuel type based on the fuel body weight for each fuel type,
The total weight calculation unit in each elemental reactor is based on the weight of each fissile element contained in the nuclear fuel in the nuclear reactor for each fuel type calculated in each elemental weight calculation unit for each fuel type. Calculating the weight of each fissile element contained in the nuclear fuel,
Is a total nuclear fissionable element weight calculation device.

A second invention is the nuclear fissionable element total weight calculation device according to the first invention,
The thermal efficiency storage unit is a nuclear fissionable element total weight calculation device that stores thermal efficiency for each unit period when the nuclear power plant operates at a constant output at a constant power.

A third invention is a nuclear fissionable element total weight calculation apparatus according to the first to second inventions,
Further comprising a void ratio storage section and a fuel composition ratio storage section which are storage areas provided in the memory;
The void rate storage unit stores the rate of change in reactivity associated with the amount of bubbles generated in the cooling water in the reactor,
The fuel composition ratio storage unit stores the composition ratio of the fissile element per unit weight of the nuclear fuel according to the void ratio and burnup,
Each elemental composition rate calculation unit for each fuel type includes a burnup for each nuclear fuel type calculated by the end-of-life burnup calculation unit for each fuel type and a burnup for each nuclear fuel type calculated by the incremental burnup calculation unit for each fuel type . The degree of burn-up, the rate of change of reactivity associated with the amount of bubbles generated in the cooling water in the reactor stored in the void rate storage unit, and the composition rate stored in the fuel composition rate storage unit Based on the fuel type, calculate the composition ratio of each fissile element per weight contained in the nuclear fuel in the reactor ,
Is a total nuclear fissionable element weight calculation device.

  According to the present invention, in the prediction of the total weight per fissile element in a nuclear power reactor using a boiling water reactor, the ratio of the burnup increment of each nuclear fuel to the burnup increment of the entire reactor In consideration of the peaking rate indicating the above, it is possible to calculate more accurately by taking into consideration the position of the nuclear fuel in the reactor, the old and new of the nuclear fuel, and the amount of the nuclear fuel in the reactor.

  FIG. 1 is a diagram showing a hardware configuration of a nuclear fissionable element total weight calculating apparatus 1 according to an embodiment of the present invention. The nuclear fissionable element total weight calculation device 1 includes a CPU 10, a memory 20, a storage device 30, a recording medium reading device 40, a communication interface 50, an input device 60, an output device 70, and the like.

  The programs stored in the storage device 30 are sequentially stored in the memory 20, and the CPU 10 executes the programs stored in the memory 20. Here, the storage device 30 is, for example, a hard disk drive. The recording medium reading device 40 can also read a program recorded on a recording medium 80 such as a CD-ROM and store it in the storage device 30.

  The communication interface 50 is an interface for transmitting / receiving data to / from another computer via a network. The other computer is, for example, a computer (not shown) for controlling a nuclear power plant in which the nuclear fissionable element total weight calculating device 1 is installed. The input device 60 is a keyboard, a mouse, or the like. The output device 70 is a display, a printer, or the like.

  FIG. 2 is a diagram showing a functional configuration of the nuclear fissionable element total weight calculation device 1 according to an embodiment of the present invention. As shown in the figure, the nuclear fissionable element total weight calculation device 1 of the present embodiment includes a power generation amount storage unit 100, a thermal efficiency storage unit 110, a total furnace weight storage unit 120, and an incremental burnup storage unit 130. , Peaking rate storage unit 140, fuel type incremental burnup storage unit 150, fuel type start burnup storage unit 160, fuel type end burnup storage unit 170, void rate storage unit 180, fuel weight ratio composition rate storage unit 190, each element composition ratio storage unit 200 by fuel type, fuel body weight storage unit 210 by fuel type, each element furnace weight storage unit 220 by fuel type, and each element furnace total weight storage unit 230, , Incremental burnup calculation unit 310, incremental burnup calculation unit by fuel type 320, end burnup calculation unit by fuel type 330, each element composition rate calculation unit by fuel type 340, each element furnace weight by fuel type And each functional unit of the calculator 350, and each element furnace total weight calculation section 360, and a. Note that the functional units 310 to 360 are realized by the CPU 10 executing a program stored in the memory 20. The storage units 100 to 230 are realized using the memory 20 or the storage device 30.

  The generated power amount storage unit 100 stores the amount of power generated by the nuclear power plant in a predetermined period (for example, one year). The thermal efficiency storage unit 110 stores thermal efficiency when the nuclear power plant operates at a constant output at a rated output. Since the thermal efficiency can change depending on the temperature of the outside air due to seasonal fluctuations or the like, the thermal efficiency for each unit period (for example, every month) may be stored. Furthermore, the in-core total weight storage unit 120 stores the total weight for each fissile element contained in the nuclear fuel loaded in the nuclear reactor at the beginning of a predetermined period (for example, April 1 at the beginning of the year). Keep it.

数式（１）は、発電電力量（ＭＷ・ｄａｙ）を熱効率で除することで、当該期間に核燃料が燃焼した量である熱出力（ＭＷ・ｄａｙ）を求め、更に炉内の核燃料の総重量（ｔｏｎ）で除することで、当該期間における１トン当りの核燃料の燃焼した量である増分燃焼度（ＭＷ・ｄａｙ／ｔｏｎ）を求めるものである。
増分燃焼度記憶部１３０には、増分燃焼度算出部３１０で算出された増分燃焼度を記憶させておく。
ピーキング率記憶部１４０には、原子炉全体の増分燃焼度に対する原子炉で用いられている核燃料タイプ毎のピーキング率を記憶させておく。ピーキング率とは、原子炉内の核燃料全体の増分燃焼度に対する各核燃料タイプ毎の増分燃焼度の比率であり、核燃料タイプ、原子炉装荷期間、装荷体本数を勘案して予め設定されるものである。 The incremental burnup calculation unit 310 is stored in the generated power amount (MW · day) stored in the generated power amount storage unit 100, the thermal efficiency (%) stored in the thermal efficiency storage unit 110, and the in-furnace total weight storage unit 120. Based on the total weight (ton) of the fissile element, the burnup increased in the predetermined period by the power generation operation is calculated by the following equation (1).

Equation (1) calculates the heat output (MW · day), which is the amount of nuclear fuel burned during the period, by dividing the amount of generated power (MW · day) by the thermal efficiency, and further calculates the total weight of nuclear fuel in the furnace. By dividing by (ton), the incremental burnup (MW · day / ton), which is the amount of nuclear fuel burned per ton during the period, is obtained.
The incremental burnup storage unit 130 stores the incremental burnup calculated by the incremental burnup calculation unit 310.
The peaking rate storage unit 140 stores the peaking rate for each nuclear fuel type used in the nuclear reactor with respect to the incremental burnup of the entire nuclear reactor. The peaking rate is the ratio of the incremental burnup for each nuclear fuel type to the incremental burnup of the entire nuclear fuel in the reactor, and is preset in consideration of the nuclear fuel type, the reactor loading period, and the number of loaded bodies. is there.

As shown in the following equation (2), the fuel type-specific incremental burnup calculation unit 320 multiplies the incremental burnup stored in the fuel type incremental burnup storage unit 130 by the peaking rate stored in the peaking rate storage unit 140. Thus, the burnup is calculated for each nuclear fuel type in the reactor.
Incremental burnup by fuel type (MW · day / ton)
= Incremental burnup (MW · day / ton) x peaking rate (2)
The incremental burnup by fuel type storage unit 150 stores the incremental burnup (MW · day / ton) during the predetermined period calculated by the incremental burnup by fuel type calculation unit 320.
The fuel type initial burnup storage unit 160 stores the burnup by nuclear fuel type (MW) at the beginning of the predetermined period (for example, if the predetermined period is a year, April 1 of each year). (Day / ton) is stored.

The fuel type-specific end-of-period burnup calculating unit 330 sets the fuel type-specific incremental burnup storage unit 150 to the incremental burnup by nuclear fuel type stored in the fuel type-by-fuel type initial burnup degree storage unit 160 for the predetermined period. By adding the burnup by nuclear fuel type in the reactor at the beginning of the period, the burnup by nuclear fuel type (MW · day / ton) at the end of the predetermined period (for example, March 31 of each year) is calculated. To do.
The end-of-life burnup storage unit 170 for each fuel type stores the burnup (MW · day / ton) for each nuclear fuel type in the reactor at the end of the predetermined period calculated by the end-of-life burnup calculation unit 330 for each fuel type. Let me.
The void ratio storage unit 180 stores a void ratio (%), which is a rate of change in reactivity with the amount of bubbles generated in the cooling water in the nuclear reactor. Further, the fuel composition ratio storage unit 190 stores the composition ratio (%) of the fissile element per unit weight of the nuclear fuel according to the void ratio and the burnup.

Each elemental composition ratio calculation unit 340 for each fuel type includes the incremental burnup for each nuclear fuel type stored in the fuel type incremental burnup storage unit 150 and the predetermined period stored in the end burnup storage unit 170 for each fuel type. The degree of burnup of each nuclear fuel type in the nuclear reactor at the end of the reactor, the rate of change in reactivity with the amount of bubbles generated in the cooling water in the nuclear reactor stored in the void ratio storage unit 180, and the weight percentage Based on the composition ratio stored in the fuel composition ratio storage unit 190, the composition ratio (%) of each fissile element per weight contained in the nuclear fuel in the nuclear reactor is calculated for each fuel type.

  For example, the burnup composition ratio table shown in FIG. 3 shows the composition ratios of fission materials and the like contained in nuclear fuel corresponding to the void ratio and burnup for the fuel type A stored in the fuel composition ratio storage unit 190. Is a comparison table. For fuel type A, using this comparison table, the burnup of nuclear fuel type A in the nuclear reactor at the end of the predetermined period stored in the end-of-period burnup storage unit 170 by fuel type and the void rate storage unit 180 The change rate of the reactivity according to the amount of bubbles generated in the stored cooling water in the reactor, and corresponding uranium 235, uranium 238, plutonium 239, plutonium 240, plutonium 241, plutonium 242, neptunium 239, etc. The composition ratio per unit weight of nuclear fuel such as each fission material can be obtained. For example, the composition ratio of plutonium 239 when the void ratio is 40% and the end-of-term burnup is 30000 (MW · day / ton) is calculated as 0.3692% according to the comparison table of the void ratio 40%.

  If the burnup value by the fuel type is not stored in the comparison table, the approximate burnup value is calculated based on the value in the comparison table. The composition ratio can be determined. For example, when the void rate is 40% for fuel type A and the burnup at the end of the period is 6500 (MW · day / ton), the composition rate of uranium 235 is 5000 (MW · day) according to the comparison table with a void rate of 40%. / Ton) is 1.7154%, and 7000 (MW · day / ton) is 1.5128%, so 1.5635% is obtained. Further, for example, when the initial burn-up for fuel type A is 5000 (MW · day / ton) and the void fraction is 30%, the composition ratio of uranium 235 is the burn-up 5000 (MW) according to the comparison table with a void fraction of 0%. (Day / ton) is 1.6913% and void ratio is 40%. According to the comparison table, 5000 (MW · day / ton) is 1.7154%, so 1.7094% is obtained. Further, for example, when the initial burnup degree is 6500 (MW · day / ton) and the void fraction is 30% for fuel type A, the composition ratio of uranium 235 is the burnup degree at a void fraction of 0% according to the same calculation as described above. Since it is 1.5299% at 6500 (MW · day / ton) and 1.5635% at 6500 (MW · day / ton) according to a comparison table with a void ratio of 40%, it is calculated as 1.5551%.

The composition ratio can be obtained in the same manner for fuels other than fuel type A.
Thus, the composition ratio (%) for each fuel type of each fissile element calculated by each element composition ratio calculation unit 340 for each fuel type is stored in the element composition ratio storage unit 200 for each fuel type.
The fuel type-specific fuel body weight storage unit 210 stores the weight (ton) of the fuel type-specific fuel body installed in the nuclear reactor.
Each element type weight calculation unit 350 for each fuel type is stored in each element composition ratio storage unit 200 for each fuel type in the fuel body weight for each fuel type stored in the fuel body weight storage unit 210 for each fuel type. By multiplying the composition ratio of each fissile element by fuel type, the weight (ton) of each fissile element contained in the nuclear fuel in the nuclear reactor is calculated for each fuel type.
The total weight calculation unit 360 in each elemental reactor is based on the weight of each fissile element in the nuclear fuel in the reactor for each fuel type calculated by each elemental weight calculation unit 350 for each fuel type. The weight of each fissile element contained in the nuclear fuel in the nuclear reactor is calculated by counting each time.

The calculated weight of each fissile element contained in the nuclear fuel in the nuclear reactor is stored in the total weight storage unit 230 in each elemental reactor.
Information stored in each of the storage units 100 to 230 can be output by the output device 70 as necessary.

  As described above, according to the nuclear fissionable element total weight calculation device 1 of the present embodiment, in the prediction of the total weight for each fissionable element in a nuclear power reactor using a boiling water reactor, More accurate by taking into account the peaking rate, which indicates the ratio of the increment of burnup of each nuclear fuel to the increment of burnup of the whole, and taking into account the location of the nuclear fuel in the reactor, the old and new of the nuclear fuel, and the amount of the nuclear fuel in the reactor Can be calculated.

  In addition, since the thermal efficiency of the nuclear power plant can change depending on the temperature of the outside air, by storing the thermal efficiency for each unit period (for example, every month) in the thermal efficiency storage unit 110, in consideration of seasonal variations, It is possible to calculate the total weight of each fissile element more accurately.

  Furthermore, the void ratio for a given rated output is a constant value (for example, 40%). However, if the void ratio changes due to a change in the lower rated output, etc., the change in the void ratio is taken into account to make the fissionability more accurate. Predictive calculation of total weight for each element can be made. In other words, in the cooling water of a nuclear power plant using a boiling water reactor, bubbles are generated due to boiling of the cooling water. Depending on the amount of these bubbles, the way the nuclear fuel burns changes, and the type of fissile material produced Since the amount also changes, accurate calculation is possible by taking the void ratio into consideration.

  In addition, the description of the above embodiment is for facilitating understanding of the present invention, and does not limit the present invention. It goes without saying that the present invention can be changed and improved without departing from the gist thereof, and that the present invention includes equivalents thereof.

It is a figure which shows the hardware constitutions of the nuclear fissionable element total weight calculation apparatus 1 in a reactor. It is a figure which shows the structure of the function with which the nuclear fissionable element total weight calculation apparatus 1 is provided. It is a figure which shows the burnup composition rate table about the fuel type A memorize | stored in the fuel composition rate memory | storage part 190. FIG.

Explanation of symbols

1 Nuclear fissionable element total weight calculation device 10 CPU
20 Memory 30 Storage Device 40 Recording Medium Reading Device 50 Communication I / F
60 Input device 70 Output device 80 Recording medium 100 Power generation amount storage unit 110 Thermal efficiency storage unit 120 In-furnace total weight storage unit 130 Incremental burnup storage unit 140 Peaking rate storage unit 150 By combustion type Incremental burnup storage unit 160 By fuel type Beginning burn-up storage unit 170 End-of-burn burnup storage unit by fuel type 180 Void rate storage unit 190 Fuel weight rate composition rate storage unit 200 Each element composition rate storage unit 210 by fuel type Fuel body weight storage unit 220 by fuel type By fuel type Each element furnace weight storage unit 230 Each element furnace total weight storage unit 310 Incremental burnup calculation unit 320 Incremental burnup calculation unit by fuel type 330 End-of-burning burnup calculation unit by fuel type 340 Each element composition rate calculation unit by fuel type 350 Each Element Furnace Weight Calculation Unit by Fuel Type 360 Each Element Furnace Total Weight Calculation Unit

Claims (5)

An apparatus for calculating the total weight of fissionable elements in the nuclear power plant reactor at the end of the predetermined period when the nuclear power plant using a boiling water reactor is operated for a predetermined period,
CPU and memory;
A storage area provided in the memory, which is a generated power amount storage unit, a thermal efficiency storage unit, an in-furnace total weight storage unit, a peaking rate storage unit, a fuel type initial combustion degree storage unit, a fuel weight ratio composition rate storage unit, and Fuel body weight storage section by fuel type ;
Incremental burnup calculation unit realized by executing a program stored in the memory by the CPU, incremental burnup calculation unit by fuel type, end burnup calculation unit by fuel type, each element composition by fuel type A rate calculation unit, a weight calculation unit in each element furnace by fuel type, and a total weight calculation unit in each element furnace ,
With
The generated power amount storage unit stores the amount of power generated by the nuclear power plant in the predetermined period,
The thermal efficiency storage unit stores thermal efficiency when the nuclear power plant operates at a rated output,
The total reactor weight storage unit stores the total weight of fissile elements contained in nuclear fuel loaded in the reactor at the beginning of the predetermined period,
The incremental burnup calculation unit includes the generated power amount stored in the generated power amount storage unit, the thermal efficiency stored in the thermal efficiency storage unit, and the total of fissionable elements stored in the in-furnace total weight storage unit. Based on the weight, the burnup increased in the predetermined period by the power generation operation,
The peaking rate storage unit stores the peaking rate for each nuclear fuel type used in the reactor with respect to the incremental burnup of the entire reactor,
The incremental burnup by fuel type calculation unit increments by nuclear fuel type in the reactor based on the incremental burnup calculated by the incremental burnup calculation unit and the peaking rate stored in the peaking rate storage unit. Calculate the burnup,
The initial burnup storage unit by fuel type stores the burnup by nuclear fuel type in the reactor at the beginning of the predetermined period,
The fuel Type end burnup calculation unit, and the nuclear fuel by type of incremental burnup calculated by the fuel Type incremental burnup calculation unit, of the predetermined period stored in the fuel Type beginning burnup storage unit Based on the burnup for each nuclear fuel type in the reactor at the beginning of the period, the burnup for each nuclear fuel type in the reactor at the end of the predetermined period is calculated,
The fuel weight ratio composition ratio storage unit stores the composition ratio of fissile elements per unit weight of nuclear fuel according to the burnup at a predetermined void ratio,
Each elemental composition ratio calculation unit for each fuel type includes a burnup ratio for each nuclear fuel type calculated by the end-of-fuel ratio calculation unit for each fuel type, and a composition ratio stored in the fuel weight ratio composition ratio storage unit. Based on the fuel type, calculate the composition ratio of each fissile element per weight contained in the nuclear fuel in the reactor,
The fuel type-specific fuel body weight storage unit stores the weight of the fuel type-specific fuel body installed in the nuclear reactor,
Each element type weight calculation unit for each fuel type is stored in the fuel type weight for each fissile element calculated by the element composition rate calculation unit for each fuel type and the fuel body weight storage unit for each fuel type. The weight of each fissile element contained in the nuclear fuel in the reactor is calculated for each fuel type based on the fuel body weight for each fuel type,
The total weight calculation unit in each elemental reactor is based on the weight of each fissile element contained in the nuclear fuel in the nuclear reactor for each fuel type calculated in each elemental weight calculation unit for each fuel type. Calculating the weight of each fissile element contained in the nuclear fuel,
A device for calculating the total weight of fissile elements in a nuclear reactor. It is a nuclear fissionable element total weight calculation apparatus of Claim 1,
The in-reactor total nuclear fissionable element weight calculation device, wherein the thermal efficiency storage unit stores thermal efficiency for each unit period when the nuclear power plant operates at a constant output at a constant output. A nuclear fissionable element total weight calculation device according to claim 1 or 2,
Further comprising a void ratio storage section and a fuel composition ratio storage section which are storage areas provided in the memory;
The void rate storage unit stores the rate of change in reactivity associated with the amount of bubbles generated in the cooling water in the reactor,
The fuel composition ratio storage unit stores the composition ratio of the fissile element per unit weight of the nuclear fuel according to the void ratio and burnup,
Each elemental composition rate calculation unit for each fuel type includes a burnup for each nuclear fuel type calculated by the end-of-life burnup calculation unit for each fuel type and a burnup for each nuclear fuel type calculated by the incremental burnup calculation unit for each fuel type . The degree of burn-up, the rate of change of reactivity associated with the amount of bubbles generated in the cooling water in the reactor stored in the void rate storage unit, and the composition rate stored in the fuel composition rate storage unit Based on the fuel type, calculate the composition ratio of each fissile element per weight contained in the nuclear fuel in the reactor ,
A device for calculating the total weight of fissile elements in a nuclear reactor. Calculate the total weight of fissile elements in the nuclear power plant reactor at the end of the period when a nuclear power plant using a boiling water reactor is operated for a specified period using the total nuclear fissionable element weight calculation device A way to
A nuclear fissionable element total weight calculation device equipped with a CPU and memory,
The amount of electric power generated by the nuclear power plant in the predetermined period stored in the memory, the thermal efficiency when the nuclear power plant operates at a constant output at a rated output, and the atoms at the beginning of the predetermined period Calculating the burnup increased in the predetermined period by the power generation operation based on the total weight of the fissile elements contained in the nuclear fuel loaded in the furnace;
Based on the calculated incremental burnup and the peaking rate for each nuclear fuel type used in the reactor relative to the incremental burnup of the entire reactor stored in the memory, the nuclear fuel type in the reactor Separately calculating the incremental burnup;
And another incremental burnup nuclear fuel types the calculated, and another burn nuclear fuel type of the reactor at the beginning of the memory stored the predetermined period, the reactor at the end of the year of the predetermined period based on Calculating the burnup for each nuclear fuel type,
Based on the calculated burnup for each nuclear fuel type and the composition ratio of the fissile element per unit weight of the nuclear fuel according to the burnup at a predetermined void rate stored in the memory, Calculating the composition ratio of each fissile element per weight contained by fuel type;
Fuel Type weight of each fissile elements that are pre-Symbol calculated, and the weight of fuel Type of fuel assemblies that are mounted in the reactor, which is stored in the memory, based on, contained in the reactor nuclear fuel Calculating the weight of each fissile element by fuel type,
Calculating the weight of each fissile element contained in the nuclear fuel in the reactor based on the calculated weight of each fissile element contained in the nuclear fuel in the reactor for each fuel type;
A total nuclear fissionable element weight calculation method. Using the nuclear fissionable element total weight calculation device to calculate the total weight of fissile elements in the nuclear power plant reactor at the end of the period when a nuclear power plant using a boiling water reactor is operated for a specified period A program for calculating
In the nuclear fissionable element total weight calculation device with CPU and memory,
The amount of electric power generated by the nuclear power plant in the predetermined period stored in the memory, the thermal efficiency when the nuclear power plant operates at a constant output at a rated output, and the atoms at the beginning of the predetermined period Calculating the burnup increased in the predetermined period by the power generation operation based on the total weight of the fissile elements contained in the nuclear fuel loaded in the furnace;
Based on the calculated incremental burnup and the peaking rate for each nuclear fuel type used in the reactor relative to the incremental burnup of the entire reactor stored in the memory, the nuclear fuel type in the reactor Separately calculating the incremental burnup;
And another incremental burnup nuclear fuel types the calculated, and another burn nuclear fuel type of the reactor at the beginning of the memory stored the predetermined period, the reactor at the end of the year of the predetermined period based on Calculating the burnup for each nuclear fuel type in the
Based on the calculated burnup for each nuclear fuel type and the composition ratio of the fissile element per unit weight of the nuclear fuel according to the burnup at a predetermined void rate stored in the memory, Calculating the composition ratio of each fissile element per weight contained by fuel type;
Fuel Type weight of each fissile elements that are pre-Symbol calculated, and the weight of fuel Type of fuel assemblies that are mounted in the reactor, which is stored in the memory, based on, contained in the reactor nuclear fuel Calculating the weight of each fissile element by fuel type,
Calculating the weight of each fissile element contained in the nuclear fuel in the reactor based on the calculated weight of each fissile element contained in the nuclear fuel in the reactor for each fuel type;
A program for calculating the total weight of fissionable elements in a nuclear reactor.

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