Method for manufacturing core barrel and core barrel

Patent metadata

Field	Value
Publication number	US-2016240271-A1
Application number	US-201615018961-A
Country	US
Kind code	A1
Filing date	Feb 9, 2016
Priority date	Feb 17, 2015
Publication date	Aug 18, 2016
Grant date	—

Abstract

A method for manufacturing a core barrel according to the embodiment includes: welding one end part of a short ring to a lower core support plate; and machining the lower core support plate to which the short ring is welded. The machining of the lower core support plate includes forming a placement surface on which the fuel assembly is to be placed; and forming a fuel alignment pin hole, in which a fuel alignment pin for positioning the fuel assembly is to be inserted. After the machining of the lower core support plate, a main body barrel is welded to the other end part of the short ring, where the main body barrel covers the reactor core including the fuel assembly to be placed on the placement surface.

First claim

1 . A method for manufacturing a core barrel which is to be disposed in a reactor pressure vessel of a pressurized water reactor and is to hold a reactor core including a fuel assembly, the method comprising:
welding one end part of a short ring to a lower core support plate; machining the lower core support plate to which the short ring is welded, the machining of the lower core support plate including:
forming a placement surface on which the fuel assembly is to be placed; and
forming a fuel alignment pin hole, in which a fuel alignment pin for positioning the fuel assembly is to be inserted; and
welding, after the machining of the lower core support plate, a main body barrel which covers the reactor core including the fuel assembly to be placed on the placement surface to the other end part of the short ring.

2 . The method for manufacturing a core barrel according to claim 1 , wherein before the machining of the lower core support plate, a heat treatment is performed on a weld line formed between the short ring and the lower core support plate.

3 . A core barrel which is to be disposed in a pressure vessel of a pressurized water reactor and is to hold a reactor core including a fuel assembly, the core barrel comprising:
a lower core support plate having a placement surface on which the fuel assembly is to be placed and having a fuel alignment pin hole in which a fuel alignment pin for positioning the fuel assembly is to be inserted; a main body barrel which covers the reactor core including the fuel assembly to be placed on the placement surface of the lower core support plate; and a short ring one end part of which is welded to the lower core support plate and the other end part of which is welded to the main body barrel.

Assignees

• Toshiba Kk

Inventors

• Yamamoto Akira
• Ono Yoshiaki
• Maruyama Daiki

Classifications

• B23K2101/12

  Vessels · CPC title

• G21C21/00 Primary

  Apparatus or processes specially adapted to the manufacture of reactors or parts thereof (in general section B, e.g. B23) · CPC title

• G21C5/10

  Means for supporting the complete structure {(arrangements for supporting vessels and core-structures G21C13/024)} · CPC title

• B23K31/02 Primary

  relating to soldering or welding · CPC title

• G21C13/093

  Concrete vessels · CPC title