| 摘要 |
PROBLEM TO BE SOLVED: To reduce the concentration of hydrogen inside a reactor containment vessel by using metal for permeating merely hydrogen gas (hydrogen permeation metal), and by extracting hydrogen being generated inside the reactor containment vessel toward the outside of the reactor containment vessel. SOLUTION: A reactor containment vessel 1 is divided into suppression chambers(S/C) 3 with a reactor pressure vessel 4, a dry well(D/W) 2, and a pressure suppression pool. In the D/W 2, a hydrogen permeation device 7 is installed. In the hydrogen permeation device 7, hydrogen permeation metal 6 of a cylindrical pipe is bundled, and its one end part is connected to a hydrogen discharge pipe 8. In the hydrogen discharge pipe 8, a separation valve 10 is installed, and a rupture disk 9 is provided at the upstream side of the separation valve 10. At the other end where the hydrogen permeation metal 6 is bundled, a drain line 12 is placed, and enters the pressure suppression pool of the S/C 3 through the rupture disk 9. Hydrogen that fills the reactor containment vessel 1 is permeated from the outside of the hydrogen permeation metal 6 of the cylindrical pipe to the inside, passes through the hydrogen discharge pipe 8, and is introduced to the outside of the reactor containment vessel 1.
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