Characterization of Suspect Fuel Rod Pieces from the 105 K West Basin
This report provides physical and radiochemical characterization results from examinations and laboratory analyses performed on {approx}0.55-inch diameter rod pieces found in the 105 K West (KW) Basin that were suspected to be from nuclear reactor fuel. The characterization results will be used to establish the technical basis for adding this material to the contents of one of the final Multi-Canister Overpacks (MCOs) that will be loaded out of the KW Basin in late FY2006 or at a later time depending on project priorities. Fifteen fuel rod pieces were found during the clean out of the KW Basin. Based on lack of specific credentials, documentation, or obvious serial numbers, none of the items could be positively identified nor could their sources or compositions be described. Item weights and dimensions measured in the KW Basin indicated densities consistent with the suspect fuel rods containing uranium dioxide (UO2), uranium metal, or being empty. Extensive review of the Hanford Site technical literature led to the postulation that these pieces likely were irradiated test fuel prepared to support of the development of the Hanford ''New Production Reactor'', later called N Reactor. To obtain definitive data on the composition of the suspect fuel, 4 representative fuel rod pieces, with densities corresponding to oxide fuel were selected from the 15 items, and shipped from the KW Basin to the Pacific Northwest National Laboratory's (PNNL) Radiological Processing Laboratory (RPL; also known at the 325 Building) for examinations and characterization. The three fuel rod that were characterized appear to contain slightly irradiated UO2 fuel, originally of natural enrichment, with zirconium cladding. The uranium-235 isotopic concentrations decreased by the irradiation and become slightly lower than the natural enrichment of 0.72% to range from 0.67 to 0.71 atom%. The plutonium concentrations, ranged from about 200 to 470 grams per metric ton of uranium and ranged in Plutonium-239 concentration from about 97 to 99 atom%.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 894475
- Report Number(s):
- PNNL-15939; 830403000; TRN: US0700163
- Country of Publication:
- United States
- Language:
- English
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DIMENSIONS
DOCUMENTATION
FUEL RODS
IRRADIATION
METRICS
N-REACTOR
OXIDES
PLUTONIUM
PLUTONIUM 239
PRODUCTION
REACTORS
URANIUM
URANIUM 235
URANIUM DIOXIDE
ZIRCONIUM
Suspect Fuel
Legacy Fuel
Fuel Rods
Fuel Pieces
Multi-Canister Overpack
MCO
K Basin Closure Project
KBC
K Basin
K West Basin
Hanford
Spent Nuclear Fuel
Spent Nuclear Fuel Project
SNF
Physical Examinations
Characterization
Gamma Energy Analysis
GEA
Alpha Energy Analysis
AEA
X-ray Diffraction
Isotope
Isotopic
Plutonium
Uranium
Uranium Oxide
Fluor Hanford
New Production Reactor