JPS5813879B2 - Cask decontamination method - Google Patents
Cask decontamination methodInfo
- Publication number
- JPS5813879B2 JPS5813879B2 JP54019322A JP1932279A JPS5813879B2 JP S5813879 B2 JPS5813879 B2 JP S5813879B2 JP 54019322 A JP54019322 A JP 54019322A JP 1932279 A JP1932279 A JP 1932279A JP S5813879 B2 JPS5813879 B2 JP S5813879B2
- Authority
- JP
- Japan
- Prior art keywords
- cask
- cleaning liquid
- pool
- decontamination
- spent nuclear
- 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
Links
Landscapes
- Cleaning By Liquid Or Steam (AREA)
Description
【発明の詳細な説明】 本発明は使用済核燃料輸送容器（以下キャスクという。[Detailed description of the invention] The present invention relates to a spent nuclear fuel transport container (hereinafter referred to as a cask).
）の除染方法に関するものである。キャスクは、使用済
核燃料をその内部に格納して輸送するためのものである
。) related to decontamination methods. A cask is used to store and transport spent nuclear fuel.
キャスク内部へ使用済核燃料を格納する作業は、被爆防
止の観点から、キャスク及び使用済核燃料をプールに浸
漬した状態で行なわれる。The operation of storing spent nuclear fuel inside a cask is carried out with the cask and spent nuclear fuel immersed in a pool to prevent exposure to radiation.
このためキャスク外表面には燃料プールの汚染水が付着
することになる。Therefore, contaminated water from the fuel pool adheres to the outer surface of the cask.
したがってキャスクを燃料プールから取り出した後輸送
前に、該キャスク外表面を除染する必要がある。Therefore, after the cask is removed from the fuel pool and before it is transported, it is necessary to decontaminate the outer surface of the cask.
本発明は除染を効率良く行ない得るキャスク除染方法を
提案するものであり、以下その実施例を図面に基づき説
明する。The present invention proposes a cask decontamination method that can perform decontamination efficiently, and examples thereof will be described below based on the drawings.
１は合成樹脂製のシートで構成された可燃性のプールで
あり、このプール１は図外の燃料プールの近傍に設けて
おくのが望ましい。Reference numeral 1 denotes a combustible pool made of a synthetic resin sheet, and it is desirable that this pool 1 be provided near a fuel pool (not shown).
プール１には洗浄液２が貯留されている。A cleaning liquid 2 is stored in a pool 1.
３はキャスクであり、このキャスク３は、燃料プール中
で使用済核燃料がその内部に格納され、密封されている
。3 is a cask, and this cask 3 stores spent nuclear fuel in the fuel pool and is sealed.
使用済核燃料の格納作業中にキャスク３の外表面は燃料
プールの汚染水と接触するため、格納作業終了後に該キ
ャスク３を燃料プール外方へ取り出したとき、その外表
面は汚染され、しかも内部に使用済核燃料を格納してい
るためその外表而は２５〜６０℃程度に昇温しでいる。During the spent nuclear fuel storage operation, the outer surface of the cask 3 comes into contact with contaminated water in the fuel pool, so when the cask 3 is taken out of the fuel pool after the storage operation, its outer surface will be contaminated and the inside will be contaminated. Because spent nuclear fuel is stored in the tank, the temperature of its outer surface has risen to about 25-60°C.
かかるキャスク３を除染するために前記プール１の洗浄
液２中へ浸漬する。The cask 3 is immersed in the cleaning liquid 2 in the pool 1 to decontaminate it.
この場合洗浄液２として、アセトン、トルエン、ベンゼ
ン等の低沸点溶剤を用いているものとする。In this case, as the cleaning liquid 2, a low boiling point solvent such as acetone, toluene, benzene, etc. is used.
浸漬時、洗浄液２は常温又は液自体の蒸発によってそれ
以下の温度となっているため、該洗浄液２中へこれより
高温のキャスク３を浸漬すると、キャスク３の外表面近
傍の洗浄液２が該キャスク３によって加熱され沸騰する
。During immersion, the cleaning liquid 2 is at room temperature or a temperature lower than that due to evaporation of the liquid itself. Therefore, when the cask 3 at a higher temperature than this is immersed in the cleaning liquid 2, the cleaning liquid 2 near the outer surface of the cask 3 will melt into the cask. It is heated by 3 and boils.
この沸騰に伴なってキャスク３の外表面が活性化し、そ
の上には気泡４が発生する。Along with this boiling, the outer surface of the cask 3 is activated, and bubbles 4 are generated thereon.
結局キャスク３の外表面の汚染物はこの沸騰エネルギー
によって除去せしめられ、洗浄液２中へ移行する。Eventually, the contaminants on the outer surface of the cask 3 are removed by this boiling energy and transferred into the cleaning liquid 2.
以上は洗浄液２として低沸点溶剤を用いた例であるが、
低沸点溶剤のかわりに通常の清水を用いることもできる
。The above is an example of using a low boiling point solvent as the cleaning liquid 2.
Ordinary fresh water can also be used instead of a low boiling point solvent.
清水を用いる場合は、プール１を密閉とし、内部を、清
水沸点がキャスク３の外表面温度よりも低温となるまで
減圧する。When using fresh water, the pool 1 is hermetically sealed, and the pressure inside is reduced until the boiling point of the fresh water becomes lower than the outer surface temperature of the cask 3.
これによって低沸点溶剤を用いるのと同様の効果を得る
ことができる。With this, the same effect as using a low boiling point solvent can be obtained.
なお図中５はクレーン（図示せず。In addition, 5 in the figure is a crane (not shown).
）から索体６を介して、吊り下げられたキャスク３の吊
具である。) is a hanging tool for the cask 3 suspended from the cable body 6.
キャスク３の除染完了後は該キャスク３をプール１中か
ら取り出し乾燥する。After the decontamination of the cask 3 is completed, the cask 3 is taken out from the pool 1 and dried.
この乾燥は自然乾燥を行なってもよいし、また強制的な
ものであってもよい。This drying may be carried out naturally or may be forced.
一方除染により汚染された洗浄液２は汚染物を分離後再
利用し、また汚染されているプール１は焼却処理する。On the other hand, the cleaning fluid 2 contaminated by decontamination is reused after separating the pollutants, and the contaminated pool 1 is incinerated.
以上の説明から明らかなように、本発明によるとキャス
クに格納されている使用済核燃料の放散熱をキャスク除
染に利用しえる点で非常に経済的であると共に、キャス
ク外表面を洗浄液の沸騰エネルギーで活性化して除染す
るので除染を早期に行なうことができ、しかもキャスク
自体に無理な力がかからないのでフィン等の保護のため
にも有益である。As is clear from the above description, the present invention is very economical in that the heat dissipated from the spent nuclear fuel stored in the cask can be used for decontamination of the cask, and the outer surface of the cask is heated by boiling of the cleaning liquid. Since it is activated and decontaminated with energy, decontamination can be carried out quickly, and since no undue force is applied to the cask itself, it is also useful for protecting the fins, etc.
また、洗浄液としてキャスク外表面の温度より低い沸点
を有するものを使用しているので、特別な加熱装置を必
要としない。Furthermore, since a cleaning liquid having a boiling point lower than the temperature of the outer surface of the cask is used, no special heating device is required.
図面は本発明実施例の説明図である。
１……プール、２……洗浄液、３……キャスク、４……
気泡。The drawings are explanatory diagrams of embodiments of the present invention. 1... Pool, 2... Cleaning liquid, 3... Cask, 4...
Bubbles.
Claims (1)
表面の温度より低い沸点を有する洗浄液に浸漬し、キャ
スク外表面と洗浄液との温度差を利用して該キャスク外
表面上で洗浄液を沸騰させることを特徴とするキャスク
除染方法。1. Immersing a cask containing spent nuclear fuel in a cleaning liquid having a boiling point lower than the temperature of the outer surface of the cask, and boiling the cleaning liquid on the outer surface of the cask using the temperature difference between the outer surface of the cask and the cleaning liquid. A cask decontamination method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54019322A JPS5813879B2 (en) | 1979-02-20 | 1979-02-20 | Cask decontamination method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54019322A JPS5813879B2 (en) | 1979-02-20 | 1979-02-20 | Cask decontamination method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55110998A JPS55110998A (en) | 1980-08-27 |
| JPS5813879B2 true JPS5813879B2 (en) | 1983-03-16 |
Family
ID=11996160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP54019322A Expired JPS5813879B2 (en) | 1979-02-20 | 1979-02-20 | Cask decontamination method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5813879B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2613351C3 (en) * | 1976-03-29 | 1982-03-25 | Kraftwerk Union AG, 4330 Mülheim | Process for the chemical decontamination of metallic components of nuclear reactor plants |
| JPS5914554B2 (en) * | 1976-05-20 | 1984-04-05 | 荏原インフイルコ株式会社 | Cleaning agent and cleaning method for poorly soluble scale |
-
1979
- 1979-02-20 JP JP54019322A patent/JPS5813879B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55110998A (en) | 1980-08-27 |
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