Boiling Water Type Nuclear Power Plant

• US 20160055924A1
• Filed: 08/20/2015
• Published: 02/25/2016
• Est. Priority Date: 08/25/2014
• Status: Active Grant

• Current Assignee: Hitachi-Ge Nuclear Energy Limited (Hitachi, Ltd.)
• Original Assignee: Hitachi-Ge Nuclear Energy Limited (Hitachi, Ltd.)
• Inventors: ONISHI, Yuriko, YOSHIKAWA, Kazuhiro, SUMIKAWA, Takashi
• Granted Patent: US 10,446,279 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G21C 1/084 Boiling water reactors
• CPC Class Codes: G21C 15/182 comprising powered means, e.g. pumps
• CPC Class Codes: G21D 1/02 Arrangements of auxiliary equipment
• CPC Class Codes: G21D 3/04 Safety arrangements emergency protection of reactor G21C9/00
• CPC Class Codes: Y02E 30/00 Energy generation of nuclear origin
• CPC Class Codes: Y02E 30/30 Nuclear fission reactors

Abstract

To more reliably supply cooling water to a reactor pressure vessel and a reactor containment vessel using a back-up building if a severe accident should occur, a boiling water type nuclear power plant includes a nuclear reactor building including a reactor containment vessel, and an external building, which is installed independently outside the nuclear reactor building and which has an anti-hazard property. The external building has a power source and an operating panel independent of the nuclear reactor building. The boiling water type nuclear power plant includes a water injection pump installed inside the external building, an alternative water injection pipe performing water injection at least on a reactor pressure vessel or the reactor containment vessel in the nuclear reactor building from the water injection pump, and a valve connected to the alternative water injection pipe, making it possible to perform alternative water injection if a severe accident occurs.

Claims

1. A boiling water type nuclear power plant comprising:

a nuclear reactor building including a reactor containment vessel and a reactor pressure vessel;

an external building which is installed independently outside the nuclear reactor building, which includes a power source and an operating panel independent of the nuclear reactor building, and which has an anti-hazard property;

a water injection pump installed inside the external building;

an alternative water injection pipe configured to perform water injection on at least the reactor pressure vessel or the reactor containment vessel in the nuclear reactor building from the water injection pump; and

a valve connected to the alternative water injection pipe.

2. The boiling water type nuclear power plant according to claim 1, wherein a branching-off portion is provided at some midpoint in the alternative water injection pipe;

and a hose connection portion allowing connection of a hose of a pumper vehicle is provided in a pipe branching off from the branching-off portion.

3. The boiling water type nuclear power plant according to claim 2, wherein the branching-off portion is provided inside the external building;

and the hose connection portion is arranged inside the external building.

4. The boiling water type nuclear power plant according to claim 2, wherein the branching-off portion is provided inside the external building;

and the hose connection portion is arranged outside the external building.

5. The boiling water type nuclear power plant according to claim 2, wherein the branching-off portion is provided inside the nuclear reactor building;

and the hose connection portion is arranged outside the nuclear reactor building.

6. The boiling water type nuclear power plant according to claim 1, wherein the external building includes a garage storing the pumper vehicle.

7. The boiling water type nuclear power plant according to claim 1, wherein, of the valves connected to the alternative water injection pipe, the valves inside the nuclear reactor building are configured of a valve operated to be kept constantly open, and a check valve.

8. The boiling water type nuclear power plant according to claim 1,

wherein the alternative water injection pipe is connected to a water injection port inside the nuclear reactor building via an up-grade alternative water injection pipe;

and

a water discharge mechanism including a flow rate restrictor is provided at the lowermost point of the up-grade alternative water injection pipe.

9. The boiling water type nuclear power plant according to claim 1, comprising:

a first alternative water injection pipe performing water injection on the reactor pressure vessel, and a second alternative water injection pipe performing water injection on the other portions, as the alternative water injection pipe; and

a bypass pipe performing water injection on the first alternative water injection pipe from the second alternative water injection pipe, and a valve installed at some midpoint of the bypass pipe.

10. The boiling water type nuclear power plant according to claim 1, comprising, at a position different from the external building, a garage storing the pumper vehicle.