Dose rate determination of UMRR fuel in preparation for transportation

Conference · Tue Dec 31 23:00:00 EST 1991 · Transactions of the American Nuclear Society; (United States)

OSTI ID:7056977

Simpkins, A A ^[1]; Bolon, A E ^[2]

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1. Westinghouse Savannah River Co., Aiken, SC (United States)
2. Univ. of Missouri, Rolla (United States)

The dose rates of the highly enriched uranium (HEU) fuel at the University of Missouri-Rolla Reactor (UMRR) were determined and a method for transporting the fuel out of the facility was recommended. The UMRR has been mandated by the US Nuclear Regulatory Commission (NRC) to convert from their existing HEU fuel to low-enriched uranium fuel. The UMRR, which is a pool-type reactor, has been operating since its first startup in 1959 with the same fuel (material test reactor MTR plate-type elements that contain U{sub 3}O{sub 8} in an aluminum matrix). The uranium enrichment is nominally 90% {sup 235}U. There are currently 14 elements, 1 half-element, and 4 control-rodded elements in the core and 8 fuel elements and 1 half-element in the storage pool. The fuel is owned by the US Department of Energy, and they will ultimately be in charge of removing it from the facility. Thermoluminescent dosimetry (TLD) was used to experimentally determine the activity of each of the fuel elements in water, and then an analytical model was developed to determine the in-air dose rates at distances of interest.

• OSTI ID: 7056977
• Report Number(s): CONF-920606--
• Journal Information: Transactions of the American Nuclear Society; (United States), Journal Name: Transactions of the American Nuclear Society; (United States) Vol. 65; ISSN TANSA; ISSN 0003-018X
• Country of Publication: United States
• Language: English

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21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
220600* -- Nuclear Reactor Technology-- Research
Test & Experimental Reactors
ACTINIDE ISO
ACTINIDE NUCLEI
ACTINIDES
ALARA
ALPHA DECAY RADIOISOTOPES
CONTROL ELEMENTS
DOSES
DOSIMETRY
ELEMENTS
ENRICHED URANIUM
ENRICHED URANIUM REACTORS
EVEN-ODD NUCLEI
FUEL ELEMENTS
FUEL POOLS
HEAVY NUCLEI
HIGHLY ENRICHED URANIUM
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPE ENRICHED MATERIALS
ISOTOPES
MATERIALS
METALS
MINUTES LIVING RADIOISOTOPES
MODERATELY ENRICHED URANIUM
NATIONAL ORGANIZATIONS
NUCLEI
OPERATION
POOL TYPE REACTORS
RADIATION DOSES
RADIATION PROTECTION
RADIOISOTOPES
REACTOR COMPONENTS
REACTOR OPERATION
REACTOR START-UP
REACTORS
REMOVAL
RESEARCH AND TEST REACTORS
RESEARCH REACTORS
SAFETY
SPENT FUEL ELEMENTS
SPONTANEOUS FISSION RADIOISOTOPES
START-UP
THERMAL REACTORS
THERMOLUMINESCENT DOSIMETRY
TRAINING REACTORS
TRANSPORT
UMRR REACTOR
UNDERWATER OPERATIONS
URANIUM
URANIUM 235
URANIUM ISOTOPES
US DOE
US NRC
US ORGANIZATIONS
WATER COOLED REACTORS
WATER MODERATED REACTORS