JPH077092B2 - Damaged fuel detection device - Google Patents
Damaged fuel detection deviceInfo
- Publication number
- JPH077092B2 JPH077092B2 JP60292054A JP29205485A JPH077092B2 JP H077092 B2 JPH077092 B2 JP H077092B2 JP 60292054 A JP60292054 A JP 60292054A JP 29205485 A JP29205485 A JP 29205485A JP H077092 B2 JPH077092 B2 JP H077092B2
- Authority
- JP
- Japan
- Prior art keywords
- cap
- pipe
- fuel
- fuel assembly
- air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Monitoring And Testing Of Nuclear Reactors (AREA)
Description
【発明の詳細な説明】 〔発明の技術分野〕 本発明は原子炉の破損燃料を検出する破損燃料検出装置
に係り、特に原子炉内における破損燃料の位置検出を安
全かつ確実に行なう破損燃料検出装置に関する。Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a damaged fuel detection device for detecting damaged fuel in a nuclear reactor, and more particularly to a damaged fuel detection for safely and reliably detecting the position of damaged fuel in a nuclear reactor. Regarding the device.
原子炉内の炉心部に設置された多数の燃料集合体は、長
期間の使用中に破損する恐れがあるので原子炉の運転を
定期的に停止させて燃料集合体の定期的検査を行なって
いる。Many fuel assemblies installed in the core of the reactor may be damaged during long-term use, so the reactor operation should be stopped regularly and the fuel assemblies should be inspected regularly. There is.
従来、原子炉の炉心部に装荷される燃料集合体はその頂
部が上部格子板から上方に突出して設置されており、こ
の設置関係を有する燃料集合体の検査は次のようにして
行なわれていた。すなわち、第３図に示すように原子炉
内の冷却水面１下の炉心２に装荷された燃料集合体３の
上端部に、空気供給管４とサンプリング管５を設けたキ
ャップ６を被せて、上部格子板７に設置し、空気供給源
より空気を供給する。この状態で、床８上から炉心２内
を覗き込みキャップ６の四隅の切欠部より気泡が均等に
出ていることを、目視で確認してキャップ６の装着が完
全であること、および各燃料集合体３間の冷却水の液面
が独立していることを確認する。第３図に示されたよう
に、この切欠部９の上端は燃料集合体のチャンネルボッ
クス上端2a位置よりも低い位置にある。従ってキャップ
６内の液面と燃料集合体内の液面さらには各燃料集合体
相互間の液面は各々独立することができる。その後、サ
ンプリング管５を通して試料水の採取を行ない、この試
料水を分析して破損燃料の検出を行なう。Conventionally, the fuel assemblies loaded in the core of a nuclear reactor are installed so that the tops thereof project upward from the upper lattice plate, and the inspection of the fuel assemblies having this installation relationship is performed as follows. It was That is, as shown in FIG. 3, a cap 6 provided with an air supply pipe 4 and a sampling pipe 5 is put on the upper end portion of the fuel assembly 3 loaded in the core 2 below the cooling water surface 1 in the reactor, It is installed on the upper lattice plate 7 and air is supplied from an air supply source. In this state, the inside of the core 2 is looked into from the floor 8 and it is visually confirmed that the bubbles are evenly ejected from the notches at the four corners of the cap 6, and the cap 6 is completely attached, and It is confirmed that the liquid level of the cooling water between the aggregates 3 is independent. As shown in FIG. 3, the upper end of the notch 9 is located lower than the upper end 2a of the channel box of the fuel assembly. Therefore, the liquid level in the cap 6, the liquid level in the fuel assembly, and the liquid level between the fuel assemblies can be independent. After that, the sample water is collected through the sampling pipe 5, and the sample water is analyzed to detect the damaged fuel.
しかしながら、燃料集合体のチャンネルボックス上端位
置が上部格子板の上端と同一レベルあるいはそれよりも
低い場合は、キャップ６に形成された切欠部９の上端位
置は燃料集合体のチャンネルボックス上端よりも高くな
ってしまうため燃料集合体の液面を独立することができ
ない。However, when the upper end position of the channel box of the fuel assembly is at the same level as or lower than the upper end of the upper lattice plate, the upper end position of the notch 9 formed in the cap 6 is higher than the upper end of the channel box of the fuel assembly. Therefore, the liquid level of the fuel assembly cannot be independent.
従って各燃料集合体内の水は切欠部の上端位置にある共
通液面と各燃料集合体のチャンネルボックル上端との間
にある水を介して相互に流入混入する。このため、ある
燃料集合体からサンプリングした水から核分裂生成物が
検出されたとしても、この燃料集合体が破損していると
は特定できない。Therefore, the water in each fuel assembly flows into and mixes with each other via the water between the common liquid surface at the upper end position of the notch and the upper end of the channel bockle of each fuel assembly. Therefore, even if fission products are detected in water sampled from a certain fuel assembly, it cannot be specified that this fuel assembly is damaged.
このように、従来の破損燃料（破損燃料集合体）の検査
装置では燃料集合体が上部格子板より突出している場合
のみ有効であり、燃料集合体が上部格子板と同一レベル
あるいはそれ以下の場合は破損燃料の検出が不可能とな
っている。As described above, the conventional inspection device for damaged fuel (damaged fuel assembly) is effective only when the fuel assembly projects from the upper grid plate, and when the fuel assembly is at the same level as the upper grid plate or less. Is unable to detect damaged fuel.
また、破損燃料検出装置のキャップ６の装着状態を目視
による確認で行なっているため、確認作業時に作業員に
放射線被曝の危険を伴い、また、炉心は冷却水で満され
ているため、透明度の低下、冷却水面の波立および光の
屈折度の違いにより目視による確認作業は正確性を欠
き、確認作業が非常に困難であるという欠点があった。Further, since the mounting state of the cap 6 of the damaged fuel detection device is visually confirmed, there is a risk of radiation exposure to the worker at the time of confirmation work, and the core is filled with cooling water. Due to the deterioration, the ripples on the cooling water surface, and the difference in the refraction of light, the visual confirmation work is inaccurate and the confirmation work is very difficult.
本発明は、以上の事情を考慮してなされたもので、燃料
集合体の頂部と上部格子板の相対位置に関係なく、破損
燃料の検出を安全かつ確実に行ない得る破損燃料検出装
置を提供することを目的とする。The present invention has been made in consideration of the above circumstances, and provides a damaged fuel detection device capable of safely and reliably detecting a damaged fuel regardless of the relative positions of the top of the fuel assembly and the upper lattice plate. The purpose is to
本発明は燃料集合体を上方から覆う複数個の中キャップ
を収容し、下端全周に弾性シールを装着したキャップ
と、上記中キャップ内に挿着されこの中キャップの下端
よりも下側に開口するサンプリング管と、前記キャップ
内に開口された空気供給管と、前記キャップ上面の近傍
に開口された空気放出管と、前記キャップの側方に取り
付けられ、前記キャップの下端が上部格子板に接したこ
とを検出するキャップ挿着性検出装置とを備え、このキ
ャップ装着性検出装置によって下端が上部格子板に接し
た時に発信される装着完了信号に応動して空気供給管お
よび空気放出管に空気を送りこむ電磁弁と、前記空気供
給管内の圧力と前記空気放出管内の圧力との差圧が、燃
料集合体の冷却材液面が上部格子板上面よりも高くない
位置において独立するに相当する所定値に達した際に試
料採取可信号を発する差圧計と、この試料採取可信号を
受けて前記各サンプリング管より、各燃料集合体内冷却
水の採取を行なうポンプを備えたことを特徴とする破損
燃料検出装置である。The present invention accommodates a plurality of middle caps that cover the fuel assembly from above, and an elastic seal is attached to the entire circumference of the lower end, and a cap that is inserted into the middle cap and that is open below the lower end of the middle cap. Sampling pipe, an air supply pipe opened in the cap, an air discharge pipe opened in the vicinity of the upper surface of the cap, and a side of the cap, and a lower end of the cap contacts an upper lattice plate. And a cap insertability detecting device for detecting that the air supply pipe and the air releasing pipe respond to a mounting completion signal transmitted when the lower end contacts the upper lattice plate. And the pressure difference between the pressure in the air supply pipe and the pressure in the air discharge pipe are independent at the position where the coolant liquid level of the fuel assembly is not higher than the upper lattice plate upper surface. And a pump for collecting the cooling water in each fuel assembly from each of the sampling pipes in response to the sample collection enable signal when the sample collection enable signal is reached. A characteristic is a damaged fuel detection device.
これにより、燃料集合体の頂部と上部格子板の相対位置
に関係なく、破損燃料の検出を安全かつ確実に行なうこ
とができるものである。As a result, regardless of the relative position of the top portion of the fuel assembly and the upper lattice plate, the damaged fuel can be detected safely and reliably.
以下、本発明の詳細を第１図および第２図に示す実施例
につき説明する。Hereinafter, the details of the present invention will be described with reference to the embodiments shown in FIGS. 1 and 2.
本発明に係る破損燃料検出装置の一実施例においては、
燃料集合体の頂部と上部格子板とが同レベルに設定され
ており、燃料集合体の検査を４本同時に取扱う場合を示
している。In one embodiment of the damaged fuel detection device according to the present invention,
It shows the case where the top of the fuel assembly and the upper lattice plate are set to the same level and four inspections of the fuel assembly are handled at the same time.
第１図および第２図において、破損燃料検出装置は、燃
料集合体２の頂部を覆うボックス状のキャップ10を有
し、このキャップ10下端に全周に亘って弾性シール10a
が取付けられ、この弾性シール10aでキャップ10と上部
格子板６の間をシールするようになっている。1 and 2, the broken fuel detection device has a box-shaped cap 10 that covers the top of the fuel assembly 2, and the elastic seal 10a is provided at the lower end of the box 10 over the entire circumference.
The elastic seal 10a seals between the cap 10 and the upper lattice plate 6.
また、上記キャップ10には個々の燃料集合体２を隔離す
る４個のボックス状の中キャップ11が収容され、各中キ
ャップ11に試料水を採取するサンプリング管12がそれぞ
れ設けられる。これらのサンプリング管12と中キャップ
11をそれぞれ昇降させる案内パイプ13がキャップ10の頂
部にスライド自在に設けられる。Further, the cap 10 accommodates four box-shaped middle caps 11 for separating the individual fuel assemblies 2, and each middle cap 11 is provided with a sampling tube 12 for collecting sample water. These sampling tubes 12 and medium cap
Guide pipes 13 for raising and lowering each 11 are slidably provided on the top of the cap 10.
一方、サンプリング管12にはチューブ14が接続され、各
チューブ14は床８上まで導かれ、先端に試料水を吸い上
げるポンプ15が設けられる。また、中キャップ11内に
は、中キャップの装着を案内する４枚の案内板16が設け
られる。On the other hand, tubes 14 are connected to the sampling tubes 12, each tube 14 is guided to the floor 8, and a pump 15 for sucking up sample water is provided at the tip. Further, inside the middle cap 11, four guide plates 16 for guiding the mounting of the middle cap are provided.
さらに、キャップ10には空気を送る空気供給管17が接続
されており、この空気供給管17はそれぞれチューブ18に
より、床８上まで導かれ、先端には供給空気の圧力、流
量を制御・監視する流量計19や、圧力計20、減圧弁21、
空気供給・停止を行なう電磁弁22が順次接続される。キ
ャップ10上面には、冷却水１の水深を測定する空気放出
管23が設けられ、この空気放出管23に接続されたチュー
ブ24は、床８上まで導かれ、先端には、供給空気の圧力
・流量を制御・監視する流量計25や圧力計26、減圧弁27
および空気供給・停止を行なう電磁弁28が順次接続され
る。Further, an air supply pipe 17 for sending air is connected to the cap 10, and each of the air supply pipes 17 is guided to the floor 8 by a tube 18, and the pressure and flow rate of the supply air are controlled and monitored at the tip. Flow meter 19, pressure gauge 20, pressure reducing valve 21,
Solenoid valves 22 for supplying and stopping air are sequentially connected. An air discharge pipe 23 for measuring the water depth of the cooling water 1 is provided on the upper surface of the cap 10, and a tube 24 connected to this air discharge pipe 23 is guided to above the floor 8, and the pressure of the supply air is supplied to the tip.・ Flow meter 25, pressure gauge 26, pressure reducing valve 27 that controls and monitors the flow rate
And the solenoid valve 28 for supplying / stopping the air is sequentially connected.
他方、キャップ10内には、その装着の案内を安全確実に
行なう十字形の案内板29が設けられ、この案内板29はキ
ャップ10の補強を兼ねている。キャップ10の外側面には
キャップ装着性検出装置30が設けられ、この検出装置30
によりキャップ10が正確に上部格子板６に着座したこと
を検知する。４個のキャップ装着性検出装置30に接続さ
れたチューブ31は、１本にまとめられて、床８上まで導
かれ、先端には、供給空気の流量・圧力を制御・監視す
る流量計32や圧力計33および減圧弁34が順次接続され
る。空気供給管17に接続されているチューブ18と空気放
出管23に接続されているチューブ24の間には、床８上に
おいて、キャップ10内の冷却水の液面指示を行なう差圧
計35が接続される。On the other hand, in the cap 10, a cross-shaped guide plate 29 for safely and securely guiding the mounting is provided, and the guide plate 29 also serves as a reinforcement of the cap 10. A cap mountability detection device 30 is provided on the outer surface of the cap 10, and this detection device 30
By this, it is detected that the cap 10 is accurately seated on the upper lattice plate 6. The tubes 31 connected to the four cap mountability detectors 30 are combined into one tube, guided to the floor 8, and at the tip thereof, a flow meter 32 for controlling / monitoring the flow rate / pressure of the supply air and a flow meter 32. The pressure gauge 33 and the pressure reducing valve 34 are sequentially connected. Between the tube 18 connected to the air supply pipe 17 and the tube 24 connected to the air discharge pipe 23, a differential pressure gauge 35 for indicating the liquid level of the cooling water in the cap 10 is connected on the floor 8. To be done.
また、流量計32は、流量が零になると、電磁弁22,28に
装着完了信号S1を送り、電磁弁22,28を動作させる構成
となっており、さらに、差圧計35が設定圧力に達すると
ポンプ15に試料採取可の信号S2を送り、ポンプ15を作動
させる構成となっている。When the flow rate becomes zero, the flow meter 32 sends the mounting completion signal S 1 to the solenoid valves 22 and 28 to operate the solenoid valves 22 and 28. When it reaches, a signal S 2 indicating that sampling is possible is sent to the pump 15 to operate the pump 15.
この破損燃料検出装置の作用は次のようにして行なわれ
る。まず、キャップ10を炉心の上方に昇降自在に支持し
ておき、これを上部格子板６の格子内の４本の燃料集合
体２上に徐々に下げて行くと、中キャップ11内の案内板
16は燃料集合体２の取手（ハンドル）に案内され、大略
の位置決めが行なわれる。この状態で、さらにキャプ10
を下げていくと、キャップ10内にある十字形の案内板29
が燃料集合体２の間の間隙に挿入され、正確に位置決め
が行なわれる。このまま、キャップ10を上部格子板６の
上面に設置されるまで下げていくと、キャップ10下端の
弾性シール10aが上部格子板６に当り、キャップ10と上
部格子板６の間がシールされる。The operation of this broken fuel detection device is performed as follows. First, the cap 10 is supported so as to be able to move up and down above the core, and is gradually lowered onto the four fuel assemblies 2 in the lattice of the upper lattice plate 6 to guide the guide plate in the middle cap 11.
16 is guided by the handle of the fuel assembly 2 and is roughly positioned. In this state, 10 more caps
As you lower the cross-shaped guide plate 29 inside the cap 10.
Are inserted into the gaps between the fuel assemblies 2 and are accurately positioned. When the cap 10 is lowered as it is until it is installed on the upper surface of the upper lattice plate 6, the elastic seal 10a at the lower end of the cap 10 contacts the upper lattice plate 6 and the gap between the cap 10 and the upper lattice plate 6 is sealed.
次に減圧弁34を開いて、設定圧力・流量の空気をチュー
ブ31を通してキャップ10の装着性検出装置30に送気し、
一定時間放置する。その後、流量計32の流量が零である
ことを確認することにより、キャップ10が正確に据付け
られていると判断する。また、流量計32の信号を電気的
に取出し、電磁弁22,28に装着完了信号S1を送り、これ
らの弁を開いて空気供給管17および水深測定用の空気放
出管23へ空気を供給する。つまり、前記装着完了信号S1
により、チューブ18を通してキャップ10内に電磁弁22に
て予め設定された圧力の空気を送る。Next, the pressure reducing valve 34 is opened, and air having a set pressure and flow rate is sent to the wearability detection device 30 of the cap 10 through the tube 31.
Leave for a certain time. After that, by confirming that the flow rate of the flow meter 32 is zero, it is determined that the cap 10 is correctly installed. Further, the signal of the flow meter 32 is electrically taken out, the mounting completion signal S 1 is sent to the solenoid valves 22 and 28, and these valves are opened to supply air to the air supply pipe 17 and the air discharge pipe 23 for water depth measurement. To do. That is, the mounting completion signal S 1
Thus, air having a preset pressure is sent by the solenoid valve 22 into the cap 10 through the tube 18.
この圧力空気の供給により、キャップ10と中キャップ11
の間に充満していた冷却水は燃料集合体のチャンネルボ
ックスの内側および外側にある流路を通して下方に排出
されて空気と置換され、キャップ10内は一定圧力に保た
れる。また、チューブ24を通して空気放出管23内に空気
を送り空気を放出させる。この時チューブ24内は空気放
出管23の水深に相当する圧力になっている。ここで、キ
ャップ10内の圧力とキャップ10上端に設置した空気放出
管23内の圧力との差圧を差圧計35で測定する。そしてこ
の差圧がキャップ10内の水位が燃料集合体のチャンネル
ボックスの上端より低いレベルにある時に相当する設定
圧力に達したら各燃料集合体２の冷却水の液面が独立に
なったと判定する。この時、差圧計35から試料採取可信
号S2をポンプ15に送り、ポンプ15を動作させて各燃料集
合体内の試料水の採取を行なう。By supplying this pressurized air, the cap 10 and the middle cap 11
The cooling water filled during the period is discharged downward through the flow passages inside and outside the channel box of the fuel assembly and is replaced with air, and the inside of the cap 10 is maintained at a constant pressure. Further, air is sent through the tube 24 into the air discharge pipe 23 to discharge the air. At this time, the inside of the tube 24 has a pressure corresponding to the water depth of the air discharge pipe 23. Here, the differential pressure between the pressure inside the cap 10 and the pressure inside the air discharge pipe 23 installed at the upper end of the cap 10 is measured by the differential pressure gauge 35. When this differential pressure reaches a set pressure corresponding to the level of water in the cap 10 lower than the upper end of the channel box of the fuel assembly, it is determined that the liquid level of the cooling water of each fuel assembly 2 has become independent. . At this time, the differential pressure gauge 35 sends a sample collection enable signal S 2 to the pump 15, and the pump 15 is operated to collect the sample water in each fuel assembly.
このようにして上部格子板６のある格子内の破損燃料検
査が完了すると、キャップ10を上方へ引上げ、その後、
移動させ、上記手順を繰り返すことにより原子炉内の全
燃料集合体２の破損燃料位置検査を自動的に実施するこ
とが可能となる。In this way, when the inspection of the broken fuel in the lattice with the upper lattice plate 6 is completed, the cap 10 is pulled up, and then,
By moving the fuel assembly and repeating the above procedure, it is possible to automatically perform the damaged fuel position inspection of all the fuel assemblies 2 in the nuclear reactor.
なお、一実施例では燃料集合体の頂部と上部格子板とが
ほぼ同レベルの場合について説明したが、中キャップは
案内パイプによりキャップに対し昇降自在に支持されて
いるので、燃料集合体の頂部が上部格子板の上面より上
方であっても、下方にある場合にも、原子炉の炉心に装
荷された燃料集合体の破損燃料を正確に検出することが
できる。In the embodiment, the case where the top of the fuel assembly and the upper lattice plate are at substantially the same level has been described, but since the middle cap is supported by the guide pipe so that it can be raised and lowered with respect to the cap, the top of the fuel assembly is Even if is above or below the upper surface of the upper lattice plate, it is possible to accurately detect the broken fuel of the fuel assembly loaded in the core of the nuclear reactor.
以上説明したように、本発明においては、キャップの下
端全周に弾性シールを装着したのでキャップ下端と設置
される上部格子板との間のシールを良好に保てるため、
キャップから空気が漏洩せずにキャップ内の水位を底下
させて冷却水液面の独立性を保つことができる。さらに
は、燃料集合体と上部格子板との相対位置に関係なくキ
ャップの装着性確認とキャップ内の冷却水液面の独立性
の確認を行なうことができ、さらに試料水の採取を自動
的に行なうものであるから、省力化が可能となり、作業
時間の短縮を図ることができ、また、作業員の目視確認
作業は不要となるので被曝低減も可能とにる。しかも、
炉心の水の透明度の低下、水面の波立および光の屈折率
の違いによる目視判断の困難等に起因する作業員個々の
判断によるバラツキの悪影響もなく、安全・確実に破損
燃料の位置検査ができ、検査の信頼性は非常に大きい。As described above, in the present invention, since the elastic seal is attached to the entire circumference of the lower end of the cap, the seal between the lower end of the cap and the upper lattice plate to be installed can be maintained well,
It is possible to maintain the independence of the cooling liquid level by lowering the water level in the cap without air leaking from the cap. Furthermore, regardless of the relative position of the fuel assembly and the upper lattice plate, it is possible to confirm the mountability of the cap and the independence of the liquid surface of the cooling water in the cap. Since this is performed, labor can be saved, work time can be shortened, and visual confirmation work by a worker is not required, so radiation exposure can be reduced. Moreover,
The location of damaged fuel can be inspected safely and surely without any adverse effect of variation due to individual judgment of the operator due to deterioration of transparency of water in the core, difficulty of visual judgment due to water ripple and difference in refractive index of light. , The inspection reliability is very high.
第１図は本発明の一実施例を示す概略断面図、第２図は
第１図のII−II線に沿う横断面図、第３図は従来の燃料
集合体の検査法を説明するための炉心上部の縦断面図で
ある。 ２……燃料集合体、６……上部格子板、８……床、10…
…キャップ、10a……弾性シール。FIG. 1 is a schematic cross-sectional view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a view for explaining a conventional fuel assembly inspection method. 2 is a vertical cross-sectional view of the upper part of the core of FIG. 2 ... Fuel assembly, 6 ... Upper lattice plate, 8 ... Floor, 10 ...
… Cap, 10a… Elastic seal.
Claims (2)
ップを収容し、下端全周に弾性シールを装着したキャッ
プと、上記中キャップ内に挿着されこの中キャップの下
端よりも下側に開口するサンプリング管と、前記キャッ
プ内に開口された空気供給管と、前記キャップ上面の近
傍に開口された空気放出管と、前記キャップの側方に取
り付けられ、前記キャップの下端が上部格子板に接した
ことを検出するキャップ挿着性検出装置とを備え、この
キャップ装着性検出装置によって下端が上部格子板に接
した時に発信される装着完了信号に応動して空気供給管
および空気放出管に空気を送りこむ電磁弁と、前記空気
供給管内の圧力と前記空気放出管内の圧力との差圧が、
燃料集合体の冷却材液面が上部格子板上面よりも高くな
い位置において独立するに相当する所定値に達した際に
試料採取可信号を発する差圧計と、この試料採取可信号
を受けて前記格サンプリング管より、各燃料集合体内冷
却水の採取を行なうポンプを備えたことを特徴とする破
損燃料検出装置。1. A cap having a plurality of middle caps for covering the fuel assembly from above and having an elastic seal attached to the entire circumference of the lower end, and a cap inserted into the middle cap and below the lower end of the middle cap. A sampling pipe open to the inside, an air supply pipe opened inside the cap, an air discharge pipe opened near the upper surface of the cap, and a side attached to the cap, and the lower end of the cap is an upper grid plate. A cap insertability detecting device for detecting contact with the air supply pipe and the air releasing pipe in response to the attachment completion signal transmitted when the lower end comes into contact with the upper lattice plate by the cap attachability detecting device. A solenoid valve for sending air to, the differential pressure between the pressure in the air supply pipe and the pressure in the air discharge pipe,
A differential pressure gauge that issues a sampling enable signal when the liquid level of the coolant of the fuel assembly reaches a predetermined value corresponding to being independent at a position not higher than the upper surface of the upper lattice plate; A damaged fuel detecting device, comprising a pump for collecting cooling water in each fuel assembly from a case sampling pipe.
パイプが立設され、この案内パイプはキャップの頂部に
スライド自在に支持された特許請求の範囲第１項に記載
の破損燃料検出装置。2. A broken fuel detecting device according to claim 1, wherein a guide pipe covering the sampling pipe is erected on the middle cap, and the guide pipe is slidably supported on the top of the cap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60292054A JPH077092B2 (en) | 1985-12-26 | 1985-12-26 | Damaged fuel detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60292054A JPH077092B2 (en) | 1985-12-26 | 1985-12-26 | Damaged fuel detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62151791A JPS62151791A (en) | 1987-07-06 |
| JPH077092B2 true JPH077092B2 (en) | 1995-01-30 |
Family
ID=17776939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60292054A Expired - Lifetime JPH077092B2 (en) | 1985-12-26 | 1985-12-26 | Damaged fuel detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH077092B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6050313B2 (en) * | 1978-04-27 | 1985-11-07 | 株式会社東芝 | Shipper cap installation status confirmation device |
| JPS5925996B2 (en) * | 1979-07-31 | 1984-06-22 | 株式会社東芝 | Damaged fuel detection device in nuclear reactor |
-
1985
- 1985-12-26 JP JP60292054A patent/JPH077092B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62151791A (en) | 1987-07-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |