U.S. Nuclear Regulatory Commission, Division of Contracts, Attn: Sharlene McCubbin, Contract Specialist, Mail Stop T-7I2, Washington, D.C. 20555

B -- SPECIAL STUDY AND ANALYSIS OF URANIUM HEXAFLUORIDE POC Sharlene McCubbin, (301) 415-6565 This synopsis is not a request for proposals. The Nuclear Regulatory Commission (NRC) is seeking a contractor to conduct a study to assess the utility of various existing analytic models (both source term and dispersion models) to estimate the consequences that could result from the inadvertent release of uranium hexafluoride (UF6). The assessment will assist NRC in judging the acceptability of such models for use in three areas of NRC regulatory responsibility: (1) analysis of potential accidents identified by a systematic evaluation of process hazards (Integrated Safety Analysis), (2) analysis of potential accidents for use in emergency planning, and (3) post-accident analysis of actual events. The models under consideration may range from simple algorithms to sophisticated dispersion models that take into account the complex thermodynamics of UF6/HF/water systems and the ''heavy vapor'' behavior of such systems. Consequently, the contractor chosen to perform the study must demonstrate expertise in source term and dispersion modelling as well as in the thermodynamic and chemical properties of UF6 and HF for various ambient conditions. The level of effort estimated for this study is 18 staff-months. To provide the NRC with an unbiased evaluation of the analytic models, the contractor should not have a preconceived preference for any particular model. For example, a contractor who has developed its own model capable of analyzing UF6 releases would most likely have a conflict of interest. In the event of an apparent or actual conflict of interest, potential contractors should address what steps they would propose to assure an unbiased evaluation. Potential sources should provide a letter of interest together with a capability statement, and resumes showing your capability to perform the studies and analysis in the areas listed above. Respondents should send the requested information to the attention of Ms. Sharlene McCubbin at the above address. Closing date for submission of responses is thirty (30) days after publication of this notice. This synopsis is not a request for proposals. Sources deemed capable will be considered if procurement ensues. (0024)

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