A skyshine study for a low-level radwaste storage facility for state compacts
- Bechtel National, Inc., Oak Ridge, TN (USA)
- Bechtel Eastern Power Corporation, Gaithersburg, MD (USA)
The Central Interstate Compact Facility, to be located in Nebraska, is designed to utilize above-grade concrete vaults for disposal of all classes of waste. Such a low-level radwaste facility (LLRWF) must meet many, and at times competing, design conditions. One of the more rigorous design conditions is to limit the yearly effluent dose and direct radiation dose to the closest resident to the facility to < 0.25 mSv (25 mrem). Thus, a shield designer must assure that the proposed design will not only be cost-effective and provide for the conventional maintenance and operations of the facility, but will also meet the performance criteria. During the operational phase of the facility, the dominant dose quickly becomes the air-scattered dose (skyshine) from the photons emerging from the roofs and walls of the facility. To investigate the sensitivity to skyshine of a preliminary design for an LLRWF, a study was undertaken using a version of the MORSE Monte Carlo program that runs on a PC/386. The effects of source energy were also examined by modeling two difference sources--{sup 60}Co and {sup 137}Cs. It was felt that these two isotopes are representative of the predominant high-energy gamma emitters for the projected waste inventory in the LLRWF. At the end of the design life of the LLRWF (i.e., full capacity at 30 yr), it was found that the difference in the yearly dose between assuring all {sup 60}Co and all {sup 137}Cs was a factor of < 2.
- OSTI ID:
- 5430654
- Report Number(s):
- CONF-891103-; CODEN: TANSA; TRN: 91-024787
- Journal Information:
- Transactions of the American Nuclear Society; (United States), Vol. 60; Conference: Winter meeting of the American Nuclear Society (ANS) and nuclear power and technology exhibit, San Francisco, CA (United States), 26-30 Nov 1989; ISSN 0003-018X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
LOW-LEVEL RADIOACTIVE WASTES
RADIOACTIVE WASTE DISPOSAL
NEBRASKA
CAPACITY
CESIUM 137
COBALT 60
DESIGN
GROUND DISPOSAL
M CODES
MAINTENANCE
MONTE CARLO METHOD
OPERATION
PERFORMANCE
PHOTONS
RADIATION DOSES
RADIATION PROTECTION
SENSITIVITY
SHIELDING
ALKALI METAL ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BOSONS
CESIUM ISOTOPES
COBALT ISOTOPES
COMPUTER CODES
DEVELOPED COUNTRIES
DOSES
ELEMENTARY PARTICLES
FEDERAL REGION VII
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MANAGEMENT
MASSLESS PARTICLES
MATERIALS
MINUTES LIVING RADIOISOTOPES
NORTH AMERICA
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
RADIOACTIVE MATERIALS
RADIOACTIVE WASTE MANAGEMENT
RADIOACTIVE WASTES
RADIOISOTOPES
USA
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES
YEARS LIVING RADIOISOT
YEARS LIVING RADIOISOTOPES
052002* - Nuclear Fuels- Waste Disposal & Storage