Monte Carlo calculational design of an NDA instrument for the assay of waste products from high enriched uranium spent fuels
The Monte Carlo design of the waste assay region of a dual assay system, to be installed at the Fluorinal and Storage Facility, is described. The instrument will be used by the facility operator to assay high-enriched spent fuel packages and waste solids produced from dissolution of the fuels. The fissile content discharged in the waste is expected to vary between 0 and 400 g of /sup 235/U. Material accountability measurements of the waste must be obtained in the presence of large neutron (0.5 x 10/sup 6/ n/s) and gamma (50,000 R/hr) backgrounds. The assay system employs fast-neutron irradiation of the sample, using a 5 mg /sup 252/Cf source, followed by delayed neutron counting after the source is transferred to storage. Calculations indicate a +-4-g (2 sigma) assay for a waste canister containing 300 g of /sup 235/U is achievable with an end-of-life (1 mg) /sup 252/Cf source and a background rate of 0.5 x 10/sup 6/ n/s.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5625319
- Report Number(s):
- LA-UR-79-3218; CONF-791117-4; TRN: 80-001895
- Resource Relation:
- Conference: ANS topical conference, Kiawah Island, SC, USA, 26 Nov 1979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
FISSILE MATERIALS
ACCOUNTING
RADIOACTIVE WASTES
NONDESTRUCTIVE ANALYSIS
SPENT FUELS
DELAYED NEUTRON ANALYSIS
FAST NEUTRONS
MONTE CARLO METHOD
URANIUM 235
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
BARYONS
CHEMICAL ANALYSIS
ELEMENTARY PARTICLES
ENERGY SOURCES
EVEN-ODD NUCLEI
FERMIONS
FISSIONABLE MATERIALS
FUELS
HADRONS
HEAVY NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MANAGEMENT
MINUTES LIVING RADIOISOTOPES
NEUTRONS
NUCLEAR FUELS
NUCLEAR REACTION ANALYSIS
NUCLEI
NUCLEONS
RADIOACTIVE MATERIALS
RADIOISOTOPES
REACTOR MATERIALS
URANIUM ISOTOPES
WASTES
YEARS LIVING RADIOISOTOPES
055001* - Nuclear Fuels- Safeguards
Inspection
& Accountability- Technical Aspects
052000 - Nuclear Fuels- Waste Management
400101 - Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures