Implementation of the active neutron Coincidence Collar for the verification of unirradiated PWR and BWR fuel assemblies
An active neutron interrogation technique has been developed for the measurement of the /sup 235/U 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 /sup 238/U by the spontaneous fission reactions. The system can be applied to the fissile content determination in fresh fuel assemblies for accountability, criticality control, and safeguards purposes. Field tests have been performed by International Atomic Energy Agency (IAEA) staff using the Coincidence Collar to verify the /sup 235/U content in light-water-reactor fuel assemblies. The results gave an accuracy of 1 to 2% in the active mode (/sup 235/U) and 2 to 3% in the passive mode (/sup 238/U) under field conditions.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 7013784
- Report Number(s):
- LA-UR-82-2797; CONF-821119-3; IAEA-SM-260/104; ON: DE83000608
- Resource Relation:
- Conference: International symposium on recent advances in nuclear materials safeguards, Nienna, Australia, 8 Nov 1982
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
FUEL ASSEMBLIES
NUCLEAR REACTION ANALYSIS
NUCLEAR MATERIALS MANAGEMENT
URANIUM 235
ACCOUNTING
ACCURACY
BWR TYPE REACTORS
COINCIDENCE METHODS
EXPERIMENTAL DATA
FIELD TESTS
NEUTRON BEAMS
PWR TYPE REACTORS
SAFEGUARDS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
BEAMS
CHEMICAL ANALYSIS
COUNTING TECHNIQUES
DATA
EVEN-ODD NUCLEI
HEAVY NUCLEI
INFORMATION
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MANAGEMENT
MINUTES LIVING RADIOISOTOPES
NUCLEI
NUCLEON BEAMS
NUMERICAL DATA
PARTICLE BEAMS
RADIOISOTOPES
REACTORS
TESTING
URANIUM ISOTOPES
WATER COOLED REACTORS
WATER MODERATED REACTORS
YEARS LIVING RADIOISOTOPES
055001* - Nuclear Fuels- Safeguards
Inspection
& Accountability- Technical Aspects
400103 - Radiometric & Radiochemical Procedures- (-1987)