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Title: In-field Calibration of a Fast Neutron Collar for the Measurement of Fresh PWR Fuel Assemblies

A new neutron collar has been designed for the measurement of fresh LEU fuel assemblies. This collar uses “fast mode” measurement to reduce the effect of burnable poison rods on the assay and thus reduce the dependence on the operator’s declaration. The new collar design reduces effect of poison rods considerably. Instead of 12 pins of 5.2% Gd causing a 20.4% effect, as in the standard thermal mode collar, they only cause a 3.2% effect in the new collar. However it has higher efficiency so that reasonably precise measurements can be made in 25 minutes, rather than the 1 hour of previous collars. The new collar is fully compatible with the use of the standard data collection and analysis code INCC. This report describes the calibration that was made with a mock-up assembly at Los Alamos National Laboratory and with actual assemblies at the AREVA Fuel fabrication Plant in Lingen, Germany.
Authors:
 [1] ;  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. European Commission (Luxembourg). Euratom Safeguards
Publication Date:
OSTI Identifier:
1178313
Report Number(s):
LA-UR--15-22843
TRN: US1500380
DOE Contract Number:
AC52-06NA25396
Resource Type:
Technical Report
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; FAST NEUTRONS; PWR TYPE REACTORS; BURNABLE POISONS; FUEL ASSEMBLIES; CALIBRATION; DESIGN; PRECISION; EFFICIENCY; NEUTRON DETECTORS; CONTROL ELEMENTS