Water injection device

Patent metadata

Field	Value
Publication number	US-10872704-B2
Application number	US-201715852817-A
Country	US
Kind code	B2
Filing date	Dec 22, 2017
Priority date	Dec 26, 2016
Publication date	Dec 22, 2020
Grant date	Dec 22, 2020

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.

First claim

The invention claimed is:

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.

2. 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.

3. 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.

4. 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.

5. 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 %.

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

Assignees

• Hitachi Ge Nuclear Energy Ltd
• Okano valve mfg co ltd

Inventors

• Hirasawa Daisuke
• Kiyotoki Yoshihisa
• Satou Hisashi
• SAKEMURA Keisuke
• Sasaki Keiji
• Fukuda Yuta

Classifications

• G21C15/18 Primary

  Emergency cooling arrangements; Removing shut-down heat · CPC title

• G21C9/016

  Core catchers · CPC title

• G21C9/00

  Emergency protection arrangements structurally associated with the reactor {, e.g. safety valves provided with pressure equalisation devices}(emergency cooling arrangements G21C15/18) · CPC title

• F16K17/386

  the closure members being rotatable or pivoting · CPC title

• G21C15/185

  using energy stored in reactor system · CPC title