# US 2022/0044832 A1 · Method for decommissioning nuclear facility

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2022/0044832 A1
- Document ID: US20220044832A1
- Status: Published application
- Kind: A1
- Application number: 17/414,006
- Filed: 2019-12-24
- Published: 2022-02-10
- Earliest claimed: 2018-12-26
- Assignees: Korea Hydro & Nuclear Power Co., Ltd.
- Applicants: Korea Hydro & Nuclear Power Co., Ltd.
- Inventors: Young Hwan HWANG; Seok-Ju HWANG; Mi-Hyun Lee; Cheon-Woo Kim
- Web page: https://patentgrep.com/patent/US20220044832A1

## CPC

- G21D 1/003: {Nuclear facilities decommissioning arrangements (decontamination arrangements, treating radioactively contaminated material G21F9/00)}
- G21C 1/086: {Pressurised water reactors}
- G21D: NUCLEAR POWER PLANT
- G21C: NUCLEAR REACTORS (fusion reactors, hybrid fission-fusion reactors G21B; nuclear explosives G21J)

## Abstract

A method for decommissioning a nuclear facility includes: floating a nuclear reactor pressure vessel above a cavity; positioning a mounting device on bio-protective concrete to cover the cavity with the mounting device; mounting a lower portion of the nuclear reactor pressure vessel on the mounting device; and cutting and decommissioning the nuclear reactor pressure vessel mounted on the mounting device.

## Claims

### Claim 1

A method for decommissioning a nuclear facility that includes a nuclear reactor pressure vessel and bio-protective concrete including a cavity in which the nuclear reactor pressure vessel is positioned, comprising:
floating the nuclear reactor pressure vessel above the cavity;
positioning a mounting device on the bio-protective concrete to cover the cavity with the mounting device;
mounting a lower portion of the nuclear reactor pressure vessel on the mounting device; and
cutting and decommissioning the nuclear reactor pressure vessel mounted on the mounting device.

### Claim 2 (depends on 1)

The method for decommissioning the nuclear facility of claim 1, wherein
the mounting device includes a mounting portion corresponding to a lower portion of the nuclear reactor pressure vessel.

### Claim 3 (depends on 2)

The method for decommissioning the nuclear facility of claim 2, wherein the mounting portion includes a curved surface.

### Claim 4 (depends on 2)

The method for decommissioning the nuclear facility of claim 2, wherein
the mounting portion includes a step-like surface.

### Claim 5 (depends on 2)

The method for decommissioning the nuclear facility of claim 2, wherein
the mounting portion further includes a through-hole penetrating a center of the mounting portion.

### Claim 6 (depends on 2)

The method for decommissioning the nuclear facility of claim 2, wherein
the mounting device further includes an elastic coating layer coated on a surface of the mounting portion.

### Claim 7 (depends on 1)

The method for decommissioning the nuclear facility of claim 1, wherein
the nuclear facility further includes a plurality of pipes directly connected to the nuclear reactor pressure vessel, and
the method further includes: expanding an inner wall of the bio-protective concrete forming the cavity; and separating the plurality of pipes from the nuclear reactor pressure vessel.

### Claim 8 (depends on 1)

The method for decommissioning the nuclear facility of claim 1, wherein
the nuclear facility further includes a crane positioned on the bio-protective concrete, and
the floating of the nuclear reactor pressure vessel above the cavity is performed by lifting the nuclear reactor pressure vessel from the bio-protective concrete by using the crane.