REACTOR CONTAINMENT VESSEL VENT SYSTEM

• Main Authors: YANO TASUKU, TAKII TAICHI, MATSUZAKI TAKAHISA, KITO KAZUAKI, YOSHIDA SHINTARO
• Format: Patent
• Language: English; Japanese
• Published: 03.10.2022
• Subjects: DECONTAMINATION ARRANGEMENTS THEREFOR; MEASUREMENT OF NUCLEAR OR X-RADIATION; MEASURING; NUCLEAR ENGINEERING; NUCLEAR PHYSICS; NUCLEAR POWER PLANT; NUCLEAR REACTORS; PHYSICS; PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULARRADIATION OR PARTICLE BOMBARDMENT; TESTING; TREATING RADIOACTIVELY CONTAMINATED MATERIAL

To provide a reactor containment vessel vent system capable of discharging oxygen gas while suppressing the discharge of radioactivity in the vent operation of a reactor containment vessel.SOLUTION: A reactor containment vessel vent system includes: a vent line 20 for exhausting gas (vent gas) inside a reactor containment vessel 1 to the outside; first and second intermediate containers 31 and 32 arranged in parallel on the vent line 20; a first rare gas filter 31a for capturing xenon and krypton, permeating vapor and hydrogen gas and dividing the inside of the first intermediate container 31 into a first upstream space 31b and a first downstream space 31c; and a second rare gas filter 32a for capturing xenon, permeating vapor, hydrogen gas and oxygen gas and dividing the inside of the second intermediate container 32 into a second upstream space 32b and a second downstream space 32c. According to the radiation dose of krypton included in the vent gas, the vent gas is discharged to one of the first upstream space 31b and the second upstream space 32b.SELECTED DRAWING: Figure 1 【課題】原子炉格納容器のベント操作において、放射能の放出を抑えつつ酸素ガスを放出できる原子炉格納容器ベントシステムを提供する。【解決手段】原子炉格納容器１の内部の気体（ベントガス）を外部に排出するベントライン２０と、ベントライン２０上に並列に配置された第１中間容器３１及び第２中間容器３２と、キセノンとクリプトンを捕集し蒸気と水素ガスを透過し第１中間容器３１内を第１上流空間３１ｂと第１下流空間３１ｃに区画する第１希ガスフィルタ３１ａと、キセノンを捕集し蒸気と水素ガスと酸素ガスを透過し第２中間容器３２内を第２上流空間３２ｂと第２下流空間３２ｃに区画する第２希ガスフィルタ３２ａとを備える。ベントガスに含まれるクリプトンの放射線量に応じて、ベントガスは第１上流空間３１ｂと第２上流空間３２ｂとのいずれか一方に放出される。【選択図】 図１