JPS5875100A - Radioactive iodine remover - Google Patents

Radioactive iodine remover

Info

Publication number
JPS5875100A
JPS5875100A JP17281881A JP17281881A JPS5875100A JP S5875100 A JPS5875100 A JP S5875100A JP 17281881 A JP17281881 A JP 17281881A JP 17281881 A JP17281881 A JP 17281881A JP S5875100 A JPS5875100 A JP S5875100A
Authority
JP
Japan
Prior art keywords
radioactive
iodine
building
radioactive iodine
exhaust
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.)
Pending
Application number
JP17281881A
Other languages
Japanese (ja)
Inventor
文夫 戸塚
堤 潔
亨 高橋
松本 雅喜
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Engineering Co Ltd
Hitachi Ltd
Original Assignee
Hitachi Engineering Co Ltd
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Engineering Co Ltd, Hitachi Ltd filed Critical Hitachi Engineering Co Ltd
Priority to JP17281881A priority Critical patent/JPS5875100A/en
Publication of JPS5875100A publication Critical patent/JPS5875100A/en
Pending legal-status Critical Current

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  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。
(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 本発明は、原子力発電プラントの建屋換気空調系CHV
AC系)及び非常用ガス処理系(5GTS系)に係シ、
特に、排気筒からプラント系外へ放出される放射性よう
素を低減するのに好適な放射性よう素除去装置に関する
。 従来の放射性よう素除去装置を第1図に示す。 通常時システムは建屋1.建屋換気空調系(以下HVA
C)3.放射性よう素除去フィルタ7、及び主排気筒6
から成り、事故時システムは建屋1゜非常用ガス処理系
(以下5GTS)4.放射性よう□未除去フィルタ7、
及び主排気筒6から成る。 通常時、建屋1に放出された放射性よう素は排気系ダク
ト5に移行し、排気WJ6に至る途中に設置された放射
性よう素除去フィルタ7によって除去された後、主排気
筒6がらプラント系外へ放出される。 冷却材喪失事故時、原子炉格納容器2がら建屋1に漏洩
した放射性よう素は5GTS系に設置された放射性よう
素除去フィルタによって除去された後、主排気筒6から
プラント系外へ放出される。 しかし、現在考案されている放射性よう素除去フィルタ
は高価であシ、又、1年〜3年に1回は交換する必要が
あるためコストが非常にかかる。 また、廃棄物が発生するという問題点がある。 本発明の目的は、排気筒から放出される放射性よう素を
低減する放射性よう素除去装置を提供するにある。 本発明はHVAC,5GTS排気系に表面積の大きな迷
路を設け、表面金スプレー等で濡らすことにより無機よ
う素゛を吸着、除去する。さらに、迷路の手前で安定よ
う素を含むIt−を放出することにより生じる化学反応
1.+CH3I“→1.”+CH,Iを利用し、放射性
有機よう素を放射性無機よう素に置換し、この放射性無
機よう素を濡れ壁に吸着させ、放出量を低減する。 以下に本発明の一実施例を第2図、第3図に、より説明
する。 第2図、第3図は、建屋と排気筒の間の排気系ダクトに
本発明の放射性よう未除去装置を設置した例を示したも
のである。 本発明は、建屋1とそれに続く排気系ダクト5゜及び主
排気筒6から成り、更に、排気系ダクト5に設置された
複数の濡れ壁14と水スプレー装置13から構成される
よう未除去装置10.及び無機よう素注入装置11と加
熱器12から構成される放射性よう素無機化装置9であ
る。 一般に、放射性よう素は放射性有機よう素CH3I”と
放射性無機よう素■げから成り、放射性無機よう素は水
に溶けやすく、壁面等に付着しやすい性質をもち、放射
線有機よう素は逆の性質をもつ。 従って、建屋1から排気系ダクトに移行した放射性無機
よう素■げは、よう未除去装置10における水スプレー
で濡らされた大きな表面積をもつ濡れ壁14に吸着され
る。一方、建屋1から排気   ゝ系ダクト5に移行し
た放射性有機よう素C1/QI”を無機よう素注入装置
11から注入された非放射性無機よう素との化学反応(
CH3I”+I2:■メ+CH8I)により放射性無機
よう素heに置換し、よう未除去装置10により吸着、
除去する。ここで、加熱器12によりこの化学反応を促
進することができる。これにより、排気筒6から放出さ
れる放射性よう素を低減させ、住民及び作業員の被曝を
低減できる。 ここで、本装置による低減効果を以下に述べる。 建屋1から排気系タソト5に移行する放射性よう素をQ
とし、そのうち無機よう素の割合をAとし、有機よう素
の割合を(1−A)とする。また、放射性有機よう素無
機化装置9により放射性有機よう素から放射性無機よう
素へ置換される割合をαとし、よう未除去装置10によ
り吸着される放射性無機よう素の割合をβとすると排気
筒から放出される放射性よう素置は次のようにして求め
ることができる。 よう未除去装置10により、建、屋より移行した放射性
無機よう素のうちQXAX(1−β)が排気筒から放出
される。一方、放射性有機丸う素のうち排気筒から放出
される量は無機よう素に置換されなかった放射性有機よ
う素置QX(1−A)×(1−α)と、置換された放射
性無機よう素のうち、濡れ壁14に吸着されなかった放
射性無機よう素置QX(1−A)Xα×(1−β)が排
気筒より放出される。従って、放射性よう未除去装置8
による放射性よう素像減率μは次式で与えられる。 →) =A(1−β)+(1−A)(t−αβ)ここで1本装
置ではα=0.1.β=0,99となることか期待でき
ることがらμは次のようになる。 μ= 0.I X (1−0,99)+019X(1−
0,9X0.99)ユ1/10 従って1本装置を設置した場合に排気筒から放出される
放射性よう素置は本装置がない場合の1/10に低減で
き、住民及び作業員の被曝を1/10程度に低減するこ
とが可能になる。 第4図は濡れ壁の表面積を大きくするための変形例を示
す。 第5図はスプレー水を再利用するだめの変形例を示す。 本発明によれば、現在、考案されているような銀ゼオラ
イト、銀アルミナ等のよう素フィルタと比較して、同程
度の放射性よう素除去効果を得るのに。 ■ 材料費がはるかに安い。    ■ 交換等のメンテナンースが不用である。 などの利点がある。
DETAILED DESCRIPTION OF THE INVENTION The present invention provides a CHV
AC system) and emergency gas treatment system (5GTS system),
In particular, the present invention relates to a radioactive iodine removal device suitable for reducing radioactive iodine released from an exhaust stack to the outside of a plant system. A conventional radioactive iodine removal device is shown in FIG. The normal system is building 1. Building ventilation air conditioning system (hereinafter referred to as HVA)
C)3. Radioactive iodine removal filter 7 and main exhaust stack 6
The accident system consists of the building 1゜emergency gas treatment system (hereinafter referred to as 5GTS)4. Radioactive □ Unremoved filter 7,
and a main exhaust stack 6. Under normal conditions, radioactive iodine released into the building 1 moves to the exhaust system duct 5, is removed by the radioactive iodine removal filter 7 installed on the way to the exhaust WJ 6, and is then removed from the main exhaust pipe 6 outside the plant system. released to. During a loss of coolant accident, the radioactive iodine that leaked from the reactor containment vessel 2 into the building 1 is removed by the radioactive iodine removal filter installed in the 5GTS system, and then released from the main exhaust stack 6 to the outside of the plant system. . However, currently devised radioactive iodine removal filters are expensive and need to be replaced once every 1 to 3 years, which is very costly. Another problem is that waste is generated. An object of the present invention is to provide a radioactive iodine removal device that reduces radioactive iodine emitted from an exhaust stack. The present invention adsorbs and removes inorganic iodine by providing a labyrinth with a large surface area in the HVAC, 5GTS exhaust system and wetting the surface with gold spray or the like. Furthermore, the chemical reaction that occurs by releasing It- containing stable iodine in front of the maze 1. +CH3I"→1." +CH,I is used to replace radioactive organic iodine with radioactive inorganic iodine, and this radioactive inorganic iodine is adsorbed on the wet wall to reduce the amount of emission. An embodiment of the present invention will be explained below with reference to FIGS. 2 and 3. FIGS. 2 and 3 show an example in which the radioactive substance removal device of the present invention is installed in an exhaust system duct between a building and an exhaust stack. The present invention consists of a building 1, an exhaust system duct 5° and a main exhaust pipe 6 following the building 1, and further comprises a plurality of wetted walls 14 installed in the exhaust system duct 5 and a water spray device 13. 10. and a radioactive iodine mineralization device 9 comprising an inorganic iodine injection device 11 and a heater 12. In general, radioactive iodine consists of radioactive organic iodine (CH3I) and radioactive inorganic iodine. Radioactive inorganic iodine is easily soluble in water and easily adheres to walls, etc., while radioactive organic iodine has the opposite properties. Therefore, the radioactive inorganic iodine that has migrated from the building 1 to the exhaust system duct is adsorbed to the wet wall 14, which has a large surface area and has been wetted with water spray in the unremoved device 10. A chemical reaction (
CH3I"+I2:■Me+CH8I) is substituted with radioactive inorganic iodine he, and the iodine is adsorbed by the unremoved device 10.
Remove. Here, this chemical reaction can be promoted by the heater 12. Thereby, the radioactive iodine released from the exhaust stack 6 can be reduced, and the radiation exposure of residents and workers can be reduced. Here, the reduction effect achieved by this device will be described below. Radioactive iodine transferred from building 1 to exhaust system 5 is Q.
The proportion of inorganic iodine is A, and the proportion of organic iodine is (1-A). Further, if the ratio of radioactive organic iodine replaced by radioactive inorganic iodine by the radioactive organic iodine mineralization device 9 is α, and the ratio of radioactive inorganic iodine adsorbed by the unremoved device 10 is β, then the exhaust pipe The amount of radioactive material emitted from can be determined as follows. Of the radioactive inorganic iodine transferred from the building and the building, QXAX (1-β) is released from the exhaust stack by the unremoved device 10. On the other hand, the amount of radioactive organic iodine emitted from the exhaust stack is the amount of radioactive organic iodine Q Of the radioactive inorganic components QX (1-A) Therefore, radioactive unremoved equipment 8
The radioactive iodine image loss rate μ is given by the following formula. →) =A(1-β)+(1-A)(t-αβ)Here, for one device, α=0.1. It can be expected that β=0.99, and μ is as follows. μ=0. I X (1-0,99)+019X(1-
0.9X0.99) U1/10 Therefore, when one device is installed, the radioactive elements emitted from the exhaust stack can be reduced to 1/10 of that without this device, reducing the radiation exposure of residents and workers. It becomes possible to reduce it to about 1/10. FIG. 4 shows a modification for increasing the surface area of the wetted wall. FIG. 5 shows a modification of the reservoir for recycling spray water. According to the present invention, compared to currently devised iodine filters made of silver zeolite, silver alumina, etc., the same level of radioactive iodine removal effect can be obtained. ■ Material costs are much lower. ■ No maintenance such as replacement is required. There are advantages such as

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は従来技術の系統図、第2図は本発明の系統図、
第3図は本発明の放射性よう素除去装置の系統図、第4
図(a)、(b)は本発明のよう素除去装置の変形例の
断面図、第5図は本発明の放射性よう素除去装置の系統
図である。 1・・・建屋、2・・・原子炉格納容器(PCV)、3
・・・HVAC系、4・・・5GTS系、5・・・排気
系ダクト、6・・・主排気筒、7・・・放射性よう素除
去フィルタ、8・・・放射性よう素除去装置、9・・・
放射性有機よう素無機化装置、10・・・よう素除去装
置、11・・・無機よう素注入装置、12・・・加熱器
、13・・・水スプレー装置、14・・・濡れ壁% 1
5・・・配管、16・・・タン$1 図 第2 目 !!−3口 第4− 図 ぴ) 3 0 (1,) 3 一一丁一一 グざ目 ゛
Figure 1 is a system diagram of the prior art, Figure 2 is a system diagram of the present invention,
Figure 3 is a system diagram of the radioactive iodine removal device of the present invention;
Figures (a) and (b) are cross-sectional views of modified examples of the iodine removal apparatus of the present invention, and FIG. 5 is a system diagram of the radioactive iodine removal apparatus of the present invention. 1... Building, 2... Reactor containment vessel (PCV), 3
...HVAC system, 4...5 GTS system, 5... Exhaust system duct, 6... Main exhaust stack, 7... Radioactive iodine removal filter, 8... Radioactive iodine removal device, 9 ...
Radioactive organic iodine mineralization device, 10... Iodine removal device, 11... Inorganic iodine injection device, 12... Heater, 13... Water spray device, 14... Wet wall % 1
5... Piping, 16... Tan $1 Diagram 2nd! ! -3rd mouth 4th- Diagram) 3 0 (1,) 3 11th, 11th, ゛

Claims (1)

【特許請求の範囲】 1、沸騰水型原子力炉において、建屋と排気筒を接続す
る建屋換気空調系の排気ダクト及び非常用ガス処理系の
配管に、表面積を大きくするように配列した壁と水スプ
レーを有する空間を設置し、前記水スプレー装置に−よ
り表面を濡らされた表面積の大きな濡れ壁によって、放
射性よう素を吸着。 除去することを特徴とする放射よう素除去装置。
[Claims] 1. In a boiling water nuclear reactor, walls and water are arranged to increase the surface area of the exhaust duct of the building ventilation and air conditioning system that connects the building and the exhaust stack, and the piping of the emergency gas treatment system. A space with a spray is installed, and radioactive iodine is adsorbed by a wetted wall with a large surface area whose surface is wetted by the water spray device. A radioiodine removal device characterized by removing radioiodine.
JP17281881A 1981-10-30 1981-10-30 Radioactive iodine remover Pending JPS5875100A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17281881A JPS5875100A (en) 1981-10-30 1981-10-30 Radioactive iodine remover

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17281881A JPS5875100A (en) 1981-10-30 1981-10-30 Radioactive iodine remover

Publications (1)

Publication Number Publication Date
JPS5875100A true JPS5875100A (en) 1983-05-06

Family

ID=15948934

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17281881A Pending JPS5875100A (en) 1981-10-30 1981-10-30 Radioactive iodine remover

Country Status (1)

Country Link
JP (1) JPS5875100A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020094979A (en) * 2018-12-14 2020-06-18 日立Geニュークリア・エナジー株式会社 Organic iodine collection apparatus and organic iodine collection method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020094979A (en) * 2018-12-14 2020-06-18 日立Geニュークリア・エナジー株式会社 Organic iodine collection apparatus and organic iodine collection method
WO2020121714A1 (en) * 2018-12-14 2020-06-18 日立Geニュークリア・エナジー株式会社 Organic iodine collection device and organic iodine collection method
EP3896704A4 (en) * 2018-12-14 2022-08-10 Hitachi-Ge Nuclear Energy, Ltd. Organic iodine collection device and organic iodine collection method

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