JPH08292293A - Reactor exhaust gas treatment system - Google Patents
Reactor exhaust gas treatment systemInfo
- Publication number
- JPH08292293A JPH08292293A JP9923395A JP9923395A JPH08292293A JP H08292293 A JPH08292293 A JP H08292293A JP 9923395 A JP9923395 A JP 9923395A JP 9923395 A JP9923395 A JP 9923395A JP H08292293 A JPH08292293 A JP H08292293A
- Authority
- JP
- Japan
- Prior art keywords
- particle
- environment
- filter
- gas
- radioactive
- 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
Links
Landscapes
- Structure Of Emergency Protection For Nuclear Reactors (AREA)
- Treating Waste Gases (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は原子炉排気ガス処理系に
関する。FIELD OF THE INVENTION The present invention relates to a reactor exhaust gas treatment system.
【0002】[0002]
【従来の技術】従来の技術では、万一の事故時にも放射
性物質を環境へ放出させないようガス処理系を設置して
いる。特に、放射性ヨウ素化合物の環境への放出を抑制
するため、ガス処理系には有機ヨウ素等も捕集するヨウ
化カリと、有機物等を含浸させた活性炭フィルタ、及
び、塵等を除去する高性能(HEPA)フィルタを用
い、放射性ヨウ素化合物を捕集あるいは吸着して除去で
きるようにしてある。2. Description of the Related Art In the prior art, a gas treatment system is installed so as not to release radioactive substances into the environment even in the event of an accident. In particular, in order to suppress the release of radioactive iodine compounds to the environment, potassium iodide that collects organic iodine and the like in the gas treatment system, activated carbon filter impregnated with organic substances, and high performance to remove dust and the like A (HEPA) filter is used so that the radioactive iodine compound can be collected or adsorbed and removed.
【0003】[0003]
【発明が解決しようとする課題】上記従来技術は、放射
性ヨウ素化合物の主成分を単体ヨウ素I2 とし、これが
環境に放出されないように構成されている。The above-mentioned prior art is constructed so that the main component of the radioactive iodine compound is elemental iodine I 2 , which is not released to the environment.
【0004】しかし、最近の知見ではヨウ素は単体ヨウ
素としてよりは、ヨウ化セシウムの放射性固体微粒子と
して燃料から放出される可能性が大きい。従来のガス処
理系でも高性能フィルタで固体微粒子を除去できるが、
多量の固体微粒子に対してはフィルタにおける圧力損失
が大きくなる可能性がある。そこで、多量の固体微粒子
に対しても捕集効率の高いガス処理系が必要となる。However, recent findings indicate that iodine is more likely to be released from the fuel as radioactive solid fine particles of cesium iodide than as elemental iodine. Solid particles can be removed with a high-performance filter even with a conventional gas treatment system,
The pressure loss in the filter may be large for a large amount of solid particles. Therefore, a gas treatment system with high collection efficiency is required even for a large amount of solid fine particles.
【0005】本発明の目的は、放射性ヨウ素化合物の化
学形態の変化に対応可能な排気ガス処理系を提供するこ
とにある。An object of the present invention is to provide an exhaust gas treatment system capable of coping with changes in the chemical form of radioactive iodine compounds.
【0006】[0006]
【課題を解決するための手段】上記目的を達成するた
め、本発明は、放射性ヨウ素化合物の固体微粒子の慣性
力を増加させ捕集板に衝突させ、あるいは、HEPAフ
ィルタより圧力損失の少ない金属製繊維フィルタに固体
微粒子を通気させ、金属繊維表面への慣性衝突により捕
集,除去する。In order to achieve the above object, the present invention is to increase the inertial force of solid fine particles of a radioactive iodine compound so that the solid particles collide with a collecting plate, or are made of metal with less pressure loss than a HEPA filter. Solid fine particles are ventilated through the fiber filter, and are collected and removed by inertial collision with the metal fiber surface.
【0007】[0007]
【作用】格納容器内から放出される放射性ヨウ素化合物
の固体微粒子を小径のノズルを通過させると、粒子が乗
っている流線が変化し、粒子の速度が増加する。ノズル
から一定の距離に捕集板を設置し、慣性力の増加した粒
子を捕集板表面に衝突させる。また、金属繊維フィルタ
に粒子を通気させ、慣性衝突などにより表面に粒子を付
着させることにより、フィルタの空隙を利用した長時間
の粒子捕集が可能となる。When solid fine particles of a radioactive iodine compound discharged from the storage container are passed through a nozzle having a small diameter, the streamline on which the particles are mounted changes, and the speed of the particles increases. A collecting plate is installed at a certain distance from the nozzle, and particles having increased inertial force are made to collide with the surface of the collecting plate. Further, by allowing the particles to pass through the metal fiber filter and adhering the particles to the surface by inertial collision or the like, it is possible to collect the particles for a long time using the voids of the filter.
【0008】[0008]
【実施例】以下、本発明の実施例を示す。図1は原子炉
排気ガス処理系で、原子炉1,原子炉建屋2,空気供給
設備3,接続配管4,粒子加速ノズル5,捕集板6,ス
テンレス製繊維フィルタ7,揮発性ヨウ素捕集用フィル
タ8,排気ガス用ファン9,排気塔10から構成され
る。事故時には原子炉1から粒径0.3μm 以上のCs
Iなどの放射性微粒子が原子炉建屋2内に放出される可
能性がある。原子炉建屋2内の空気の漏洩による、環境
へのCsIなどの粒子の放出を防止するため、空気供給
設備3から空気を建屋内に最大流量75m3/hr で供
給するとともに、排気ガス用ファン9を作動させ排気塔
10より排気する。建屋内空気18000m3 を50〜10
0%/day の割合で換気する。CsI粒子は接続配管4
を経て慣性捕集器に送気される。慣性捕集器内には、孔
径0.1cm のノズルが200個空けられたノズルプレー
トが設置されており、ノズル通過時の粒子速度は56m
/sである。粒子個数濃度が108個/cm3で、粒径0.
3μm のCsI粒子の場合でも、ノズル通過後、ノズ
ルプレートから3mmの距離に設置された捕集板上に慣性
衝突し、粒子の50%以上が捕集され個数濃度5×10
7個/cm3以下になる。慣性捕集器を通過したCsIなど
の粒子は接続配管を経て、フィルタユニットに供給され
る。フィルタユニット内には、繊維径4μm,充填率0.
00625 のステンレス製繊維フィルタが充填されている。
フィルタユニットは面積0.25m2,厚さ35cmであ
る。フィルタユニット通過後の粒子は99.99% 以上
除去される。EXAMPLES Examples of the present invention will be shown below. FIG. 1 shows a reactor exhaust gas treatment system, which includes a reactor 1, a reactor building 2, an air supply facility 3, a connecting pipe 4, a particle accelerating nozzle 5, a collecting plate 6, a stainless fiber filter 7, and volatile iodine collecting. The exhaust gas filter 8, the exhaust gas fan 9, and the exhaust tower 10. At the time of the accident, Cs with a particle size of 0.3 μm or more from the reactor 1
There is a possibility that radioactive fine particles such as I will be released into the reactor building 2. In order to prevent the release of particles such as CsI to the environment due to the air leak in the reactor building 2, the air is supplied from the air supply facility 3 into the building at a maximum flow rate of 75 m 3 / hr, and the exhaust gas fan is used. 9 is operated to exhaust from the exhaust tower 10. 50 to 10 in the building air 18,000m 3
Ventilate at a rate of 0% / day. CsI particles are connecting pipes 4
It is sent to the inertial collector via the. Inside the inertial collector, a nozzle plate with 200 nozzles with a hole diameter of 0.1 cm is installed, and the particle velocity when passing through the nozzle is 56 m.
/ S. The particle number concentration is 10 8 particles / cm 3 , and the particle size is 0.1.
Even in the case of 3 μm CsI particles, after passing through the nozzle, they collide inertially on a collection plate installed at a distance of 3 mm from the nozzle plate, 50% or more of the particles are collected and the number concentration is 5 × 10 5.
7 pieces / cm 3 or less. Particles such as CsI that have passed through the inertial collector are supplied to the filter unit through the connecting pipe. Inside the filter unit, the fiber diameter is 4 μm and the filling rate is 0.
Filled with 00625 stainless fiber filter.
The filter unit has an area of 0.25 m 2 and a thickness of 35 cm. After passing through the filter unit, 99.99% or more of particles are removed.
【0009】また、事故時には最大約37kgのCsIな
どの放射性微粒子が放出される可能性がある。ステンレ
ス製繊維フィルタの空隙率は99.375% で、フィル
タユニット内の空間の体積は0.0869m3である。C
sIなどの粒子の密度は約4.5g/cm3なので、全体積
は0.0082m3となり、これはフィルタ内の空間体積
の約10%にあたる。従ってフィルタユニットはCsI
などの放射性微粒子を全て吸着させても、圧力損失はほ
とんど増加しない。また、フィルタ内部から再飛散によ
り粒子が放出されることもない。CsI等の放射性微粒
子捕集後の排気ガスは、その後揮発性ヨウ素捕集用フィ
ルタ8に送られ、活性炭等の気体吸着剤によってガス状
放射性物質の99%以上が除去された後、環境に放出さ
れる。このように、本実施例から原子炉格納容器から放
出された放射性ヨウ素化合物の固体微粒子を小径のノズ
ルとステンレス製繊維フィルタを通過させることによ
り、環境への放出を防止できる。Further, at the time of an accident, a maximum of about 37 kg of radioactive fine particles such as CsI may be released. The porosity of the stainless fiber filter is 99.375%, and the volume of the space inside the filter unit is 0.0869 m 3 . C
Since the density of particles such as sI is about 4.5 g / cm 3 , the total volume is 0.0082 m 3 , which is about 10% of the spatial volume in the filter. Therefore, the filter unit is CsI
Even if all the radioactive fine particles are adsorbed, the pressure loss hardly increases. Further, particles are not emitted from the inside of the filter due to re-scattering. The exhaust gas after collecting the radioactive particulates such as CsI is then sent to the filter 8 for collecting volatile iodine, and 99% or more of the gaseous radioactive substances are removed by a gas adsorbent such as activated carbon, and then released to the environment. To be done. As described above, the solid fine particles of the radioactive iodine compound discharged from the reactor containment vessel according to the present embodiment can be prevented from being discharged into the environment by passing through the nozzle having the small diameter and the stainless fiber filter.
【0010】[0010]
【発明の効果】本発明によれば、原子炉格納容器内から
放出された放射性ヨウ素化合物の固体微粒子を、慣性衝
突により捕集材表面に付着させることにより捕集除去で
き、環境への放出を防止できる。According to the present invention, the solid fine particles of the radioactive iodine compound released from the reactor containment vessel can be trapped and removed by adhering to the surface of the trapping material by inertial collision, and the release to the environment. It can be prevented.
【図1】本発明の一実施例のブロック図。FIG. 1 is a block diagram of an embodiment of the present invention.
【符号の説明】 1…原子炉、2…原子炉建屋、3…空気供給設備、4…
接続配管、5…粒子加速ノズル、6…捕集板、7…ステ
ンレス製繊維フィルタ、8…揮発性ヨウ素捕集用フィル
タ、9…排気ガス用ファン、10…排気塔。[Explanation of symbols] 1 ... Reactor, 2 ... Reactor building, 3 ... Air supply equipment, 4 ...
Connection pipe, 5 ... Particle accelerating nozzle, 6 ... Collection plate, 7 ... Stainless fiber filter, 8 ... Volatile iodine collection filter, 9 ... Exhaust gas fan, 10 ... Exhaust tower.
Claims (2)
を捕集する排気ガス処理系において、放射性微粒子と揮
発性気体を別々に捕集することを特徴とする原子炉排気
ガス処理系。1. An exhaust gas treatment system for collecting radioactive substances released from a reactor containment vessel, wherein radioactive particulates and a volatile gas are separately collected.
る排気ガス処理系において、前記放射性微粒子を慣性衝
突により捕集,除去することを特徴とする原子炉排気ガ
ス処理系。2. An exhaust gas treatment system for separately collecting radioactive fine particles and a volatile gas, wherein the radioactive fine particles are collected and removed by inertial collision.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9923395A JPH08292293A (en) | 1995-04-25 | 1995-04-25 | Reactor exhaust gas treatment system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9923395A JPH08292293A (en) | 1995-04-25 | 1995-04-25 | Reactor exhaust gas treatment system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH08292293A true JPH08292293A (en) | 1996-11-05 |
Family
ID=14241970
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9923395A Pending JPH08292293A (en) | 1995-04-25 | 1995-04-25 | Reactor exhaust gas treatment system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH08292293A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002071895A (en) * | 2000-08-30 | 2002-03-12 | Fuji Electric Co Ltd | Volume reducing system of radioactive waste |
KR20170027830A (en) * | 2014-07-14 | 2017-03-10 | 아레바 인코포레이티드 | Convective dry filtered containment venting system |
-
1995
- 1995-04-25 JP JP9923395A patent/JPH08292293A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002071895A (en) * | 2000-08-30 | 2002-03-12 | Fuji Electric Co Ltd | Volume reducing system of radioactive waste |
KR20170027830A (en) * | 2014-07-14 | 2017-03-10 | 아레바 인코포레이티드 | Convective dry filtered containment venting system |
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