METHOD AND INSTRUMENT FOR MEASURING THICKNESS OF BUILD-UP WELD OF REACTOR PRESSURE VESSEL

Title:

METHOD AND INSTRUMENT FOR MEASURING THICKNESS OF BUILD-UP WELD OF REACTOR PRESSURE VESSEL

Document Type and Number:

Japanese Patent JPH07110203

Kind Code:

A

Abstract:

PURPOSE: To provide a method and instrument for accurately measuring the build-up weld of a reactor pressure vessel.

CONSTITUTION: With a magnetic yoke 202 having an arbitrary magnetic path length and cross-sectional area press-contacted with the surface 104 of a build-up weld 105 on a reactor pressure vessel so that a magnetic path can be formed by the yoke 101 and pressure vessel, the yoke 101 is magnetized to measure a magnetic field distribution 301a-301i on the surface 104 and in the vicinity of the weld 105. Then the thickness (g) of the weld 105 is identified from the median and half-width of the measured magnetic field distribution.

Inventors:

ARA KATSUYUKI
NAKAJIMA SHINYA
EBINE NORIYA

Application Number:

JP25294993A

Publication Date:

April 25, 1995

Filing Date:

October 08, 1993

Export Citation:

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Assignee:

JAPAN ATOMIC ENERGY RES INST

International Classes:

G01B7/06; G01B7/00; G01N27/82; G21C17/003; G21C17/01; (IPC1-7): G01B7/06; G01N27/82; G21C17/003

Attorney, Agent or Firm:

Kyozo Yuasa (6 people outside)

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