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Title: Detecting pin diversion from pressurized water reactors spent fuel assemblies

Detecting diversion of spent fuel from Pressurized Water Reactors (PWR) by determining possible diversion including the steps of providing a detector cluster containing gamma ray and neutron detectors, inserting the detector cluster containing the gamma ray and neutron detectors into the spent fuel assembly through the guide tube holes in the spent fuel assembly, measuring gamma ray and neutron radiation responses of the gamma ray and neutron detectors in the guide tube holes, processing the gamma ray and neutron radiation responses at the guide tube locations by normalizing them to the maximum value among each set of responses and taking the ratio of the gamma ray and neutron responses at the guide tube locations and normalizing the ratios to the maximum value among them and producing three signatures, gamma, neutron, and gamma-neutron ratio, based on these normalized values, and producing an output that consists of these signatures that can indicate possible diversion of the pins from the spent fuel assembly.
Inventors:
;
Issue Date:
OSTI Identifier:
1338908
Assignee:
Lawrence Livermore National Security, LLC (Livermore, CA) LLNL
Patent Number(s):
9,543,046
Application Number:
12/619,791
Contract Number:
AC52-07NA27344
Resource Relation:
Patent File Date: 2009 Nov 17
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Other works cited in this record:

Transfer Machine for Nuclear Reactor
patent, December 1971

Method and apparatus for measuring irradiated fuel profiles
patent, June 1982

Method for monitoring irradiated nuclear fuel using Cerenkov radiation
patent, June 1983

Gripper assembly for inserting and removing burnable absorber rods and thimble plugs in a nuclear reactor fuel assembly
patent, September 1988

Monitor for measuring both the gamma spectrum and neutrons emitted by an object, such as spent nuclear fuel
patent, March 2000

Detector and method for inspecting a sealed nuclear storage container
patent, April 2009

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