U.S. Nuclear Regulatory Commission, Division of Contracts, Attn: Linda Wise MS-T-7I2, Washington, D.C. 20555

A -- PEER REVIEW OF THERMAL HYDRAULIC RESEARCH POC Contact: Steve Pool Contract Specialist, 301-415-8168 This synopsis is a market survey, not a request for proposals. The Nuclear Regulatory Commission (NRC) is seeking independent experts to conduct peer reviews of research work in areas related to numerical methods used in two-phase flows. One goal of the research is to improve the numerical methods used to solve a six equation (2 mass, 2 momentum, 2 energy) model formulation of water and steam flowing through a one-dimensional (some three-dimensional components) network of pipes and vessels. Codes of this type are in use by the NRC at this time and are used to predict the behavior of the cooling system of nuclear reactors. Examples of areas under consideration include differencing schemes, meshing techniques, solution algorithms, and coupling of solutions with other codes (CFD for example). Another research goal is to quantify the uncertainties in two-phase flow modeling as used in the NRC's own reactor system codes. The NRC is interested in comparisons of individual model results with experimental datain which the uncertainty of individual components of the constitutive models are quantified. A fundamental assessment of the models is needed to insure that compensating errors in model formulations do not hide the true uncertainty in the model. A third goal of the NRC is the use of CFD techniques for the solution of two-phase problems in sub-sections of reactor systems. To provide the NRC with an unbiased evaluation of the above described research, potential sources must have extensive experience in two-phase techniques, model formulations, and system analysis codes. Potential sources should provide a capability statement to perform peer reviews of the above described research areas. This statement should include a description of professional qualifications, previous similar projects, and any existing relationship with NRC licensees. Respondents should send the requested information to the above address. Closing date for submission of responses is 30 days after publication of this notice. This synopsis is not a request for proposals. Sources deemed capable will be considered if procurement ensues.***** (0247)

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