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Title: Apparatus for in situ determination of burnup, cooling time and fissile content of an irradiated nuclear fuel assembly in a fuel storage pond

A detector head for in situ inspection of irradiated nuclear fuel assemblies submerged in a water-filled nuclear fuel storage pond. The detector head includes two parallel arms which extend from a housing and which are spaced apart so as to be positionable on opposite sides of a submerged fuel assembly. Each arm includes an ionization chamber and two fission chambers. One fission chamber in each arm is enclosed in a cadmium shield and the other fission chamber is unshielded. The ratio of the outputs of the shielded and unshielded fission chambers is used to determine the boron content of the pond water. Correcting for the boron content, the neutron flux and gamma ray intensity are then used to verify the declared exposure, cooling time and fissile material content of the irradiated fuel assembly.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
5407195
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; FUEL POOLS; RADIATION MONITORING; FISSION CHAMBERS; IONIZATION CHAMBERS; BORON; GAMMA DETECTION; NEUTRON FLUX; DETECTION; ELEMENTS; MEASURING INSTRUMENTS; MONITORING; NEUTRON DETECTORS; RADIATION DETECTION; RADIATION DETECTORS; RADIATION FLUX; SEMIMETALS 440101* -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments