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Portable Neutron Measurement Technique for the Assay of 235U in LWR Fuel Assemblies

Conference ·
OSTI ID:6579431
 [1];  [1]
  1. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
+ Show Author Affiliations

An active neutron interrogation technique has been developed for the measurement of the 235U content in fresh fuel assemblies. The method employs an AmLi neutron source to induce fission reactions in the fuel assembly and coincidence counting of the resulting fission reaction neutrons. When no interrogation source is present, the passive neutron coincidence rate gives a measure of the 238U via the spontaneous fission reactions. The system can be applied to the fissile content determination in HWR, BWR, and LWR fuel assemblies for accountability, criticality control, and safeguards purposes.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
DOE Contract Number:
W-7405-ENG-36
OSTI ID:
6579431
Report Number(s):
LA-UR--81-358; CONF-810513-1
Country of Publication:
United States
Language:
English

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Related Subjects

055001* -- Nuclear Fuels-- Safeguards
Inspection
& Accountability-- Technical Aspects
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400103 -- Radiometric & Radiochemical Procedures-- (-1987)
98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION
ACCOUNTING
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
Active Neutron Interrogation Technique
AmLi Neutron Source
BWR TYPE REACTORS
CHEMICAL ANALYSIS
COINCIDENCE METHODS
COUNTING TECHNIQUES
DECAY
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FISSILE MATERIALS
FISSION
FISSIONABLE MATERIALS
FUEL ASSEMBLIES
HEAVY NUCLEI
HEAVY WATER MODERATED REACTORS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MATERIALS
MINUTES LIVING RADIOISOTOPES
NEUTRON SOURCES
NUCLEAR REACTIONS
NUCLEI
Nuclear Criticality Safety Program (NCSP)
PARTICLE SOURCES
PWR TYPE REACTORS
QUANTITATIVE CHEMICAL ANALYSIS
RADIATION SOURCES
RADIOISOTOPES
RADIOMETRIC ANALYSIS
REACTORS
SAFEGUARDS
SPONTANEOUS FISSION
URANIUM 235
URANIUM 238
URANIUM ISOTOPES
WATER COOLED REACTORS
WATER MODERATED REACTORS
YEARS LIVING RADIOISOTOPES