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Title: In-plant test and evaluation of the neutron collar for verification of PWR fuel assemblies at Resende, Brazil

The neutron-coincidence collar has been evaluated for the measurement of pressurized-water reactor (PWR) fuel assemblies at the Fabrica de Elementos Combustiveis plant in Resende, Brazil. This evaluation was part of the cooperative-bilateral-safeguards technical-exchange program between the United States and Brazil. The neutron collar measures the STVU content per unit length of full fuel assemblies using neutron interrogation and coincidence counting. The STYU content is measured in the passive mode without the AmLi neutron-interrogation source. The extended evaluation took place over a period of 6 months with both scanning and single-zone measurements. The results of the tests gave a coincidence-response standard deviation of 0.7% (sigma = 1.49% for mass) for the active case and 2.5% for the passive case in 1000-s measurement times. The length measurement in the scanning mode was accurate to 0.77%. The accuracies of different calibration methods were evaluated and compared.
Authors:
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Publication Date:
OSTI Identifier:
6265671
Report Number(s):
LA-10562-MS
ON: DE86005860
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Technical Report
Research Org:
Los Alamos National Lab., NM (USA)
Country of Publication:
United States
Language:
English
Subject:
98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; PWR TYPE REACTORS; SAFEGUARDS; COINCIDENCE METHODS; FUEL ASSEMBLIES; COUNTING TECHNIQUES; REACTORS; WATER COOLED REACTORS; WATER MODERATED REACTORS 055001* -- Nuclear Fuels-- Safeguards, Inspection, & Accountability-- Technical Aspects; 210200 -- Power Reactors, Nonbreeding, Light-Water Moderated, Nonboiling Water Cooled; 400103 -- Radiometric & Radiochemical Procedures-- (-1987)