Title:
燃焼度評価方法および装置
Document Type and Number:
Japanese Patent JP4601838
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To evaluate a burn-up of a spent fuel assembly by correcting a positional shift in measurement to provide a precise burn-up data. SOLUTION: This burn-up evaluating method has a neutron measuring step for arranging a neutron detector group 5 having the first and second neutron detectors 3, 4 fixed each other in the vicinity of the fuel assembly 2 to measure a neutron counting rate, a ratio calculating step for finding a ratio of the obtained neutron counting rates, a function setting step for setting a function for expressing a relation between the neutron counting rate and detection efficiency of the first neutron detector by a simulation experiment or Monte Carlo calculation, a conversion step for converting the ratio of the neutron counting rate into the detection efficiency of the first neutron detector based on the function, and a neutron counting rate correcting step for correcting the positional shift of the counting rate of the neutron detector based on the counting rate of the neutron detector provided in the neutron measuring step and the detection efficiency of the neutron detector provided in the conversion step.
Inventors:
Kenichi Yoshioka
Sei Ueda
Mitsuhashi
Sei Ueda
Mitsuhashi
Application Number:
JP2001031753A
Publication Date:
December 22, 2010
Filing Date:
February 08, 2001
Export Citation:
Assignee:
Toshiba Corporation
International Classes:
G21C17/06; G01T3/00
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Attorney, Agent or Firm:
Toshio Kanata
Yoshiaki Inomata
Hiroko Inomata
Yoshiaki Inomata
Hiroko Inomata