Title:
【発明の名称】原子炉格納容器の構造
Document Type and Number:
Japanese Patent JP2511931
Kind Code:
B2
Abstract:
PURPOSE:To enable the easy measurement of the thickness of a plate (steel plate) by a method wherein a hole extending from the surface of concrete to the surface of the plate is provided in the concrete covering the plate. CONSTITUTION:Dry well bottom concrete 5 is deposited in the bottom part of a dry well 2 for a reactor container during the construction of a plant. Prior to the deposition of this concrete 5, a pipe is set as a sleeve 11 opened in both ends. The sleeve 11 is so set that the upper end projects above the surface of the concrete 5 while the lower end contacts with the inner surface of a spherical shell 10 of the lower part of the dry well. The sleeve 11 is set at several representative places of the shell 10 including a place under a pedestal 4 of a reactor pressure vessel. Then, a probe 13 of an ultrasonic thickness meter 12 is made to contact the inner wall surface of the shell 10 to measure the plate thickness of the shell 10. Besides, a flange 15 is provided at the upper end of the sleeve 11, and a closing plate 16 is fitted to the flange 15 with bolts except for the time of measurement, so as to prevent the inflow of water.
Inventors:
NAGATA TETSUYA
FURUKAWA HIDEYASU
KUME TADASHI
FURUKAWA HIDEYASU
KUME TADASHI
Application Number:
JP3799387A
Publication Date:
July 03, 1996
Filing Date:
February 23, 1987
Export Citation:
Assignee:
HITACHI LTD
International Classes:
G21C13/00; E04H7/00; G01B21/08; (IPC1-7): G21C13/00; G01B21/08
Domestic Patent References:
| JP60175920B | ||||
| JP59178310B |
Attorney, Agent or Firm:
Katsuo Ogawa (1 person outside)