# US 10,872,704 B2 · Water injection device

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- Number: US 10,872,704 B2
- Document ID: US10872704B2
- Status: Granted
- Kind: B2
- Application number: 15/852,817
- Filed: 2017-12-22
- Published: 2018-06-28
- Granted: 2020-12-22
- Earliest claimed: 2016-12-26
- Assignees: Hitachi-GE Nuclear Energy, Ltd.; Okano Valve Mfg. Co. Ltd.
- Applicants: Hitachi-GE Nuclear Energy, Ltd.; Okano Valve Mfg. Co. Ltd.
- Inventors: Daisuke Hirasawa; Yoshihisa Kiyotoki; Hisashi Satou; Keisuke Sakemura; Keiji Sasaki; Yuta Fukuda
- Web page: https://patentgrep.com/patent/US10872704B2

## CPC

- G21C 15/18: Emergency cooling arrangements; Removing shut-down heat
- G21C 9/016: Core catchers
- G21C 15/243: for liquids
- G21C 15/185: {using energy stored in reactor system}
- Y02E 30/30: Nuclear fission reactors
- G21C: NUCLEAR REACTORS (fusion reactors, hybrid fission-fusion reactors G21B; nuclear explosives G21J)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A high reliable water injection device is provided that injects water into a reactor containment vessel and can reliably shut off cooling water at normal times and quickly and reliably inject water into the reactor containment vessel without the need for external power, in a case of emergency. The water injection device injects water into a reactor containment vessel includes a flow path through which cooling water is supplied; a disk that closes the flow path; a swing arm that is connected to the disk and performs closing and opening of the flow path by the disk; and a weight that is connected to the swing arm via a swing lever, in which the weight is supported by a support member made of a low melting point alloy.

## Claims

### Claim 1

A water injection device that injects water into a reactor containment vessel, the device comprising:
a flow path through which cooling water is supplied;
a disk that closes the flow path;
a swing arm that is connected to the disk and performs closing and opening of the flow path by the disk; and
a weight that is connected to the swing arm via a swing lever, wherein
the weight is supported by a support member made of a low melting point alloy,
the swing arm has one end which is rotatably supported by a body of the water injection device and another end which is rotatably connected to the swing lever,
an end portion of a side opposite to an end portion which is connected to the swing arm of the swing lever is connected to the weight via a wire, and
the low melting point alloy is an alloy that is in a solid state at a temperature lower than 200° C. and is in a liquid state at 260° C.

### Claim 2 (depends on 1)

The water injection device according to claim 1,
wherein the flow path is closed by the disk by a connection portion between the swing arm and the swing lever being supported by an arm rotatably provided with respect to the body of the water injection device.

### Claim 3 (depends on 1)

The water injection device according to claim 1,
wherein the disk is seal welded to a body of the water injection device using a metal material having a melting point lower than that of the low melting point alloy constituting the support member.

### Claim 4 (depends on 1)

The water injection device according to claim 1, wherein the support member melts due to the temperature rise of the surrounding environment of the water injection device, the weight falls, the disk is released due to the fall of the weight, and water is injected into the reactor containment vessel.

### Claim 5 (depends on 1)

The water injection device according to claim 1, wherein the low melting point alloy constituting the support member is an alloy including Sb: 8.0 mass % to 12.5 mass %, Ag: 0 to 6.0 mass %, and Cu: 0 to 1.5 mass %.

### Claim 6 (depends on 5)

The water injection device according to claim 5, wherein the low melting point alloy constituting the support member is an alloy further including Sn.