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

A -- REVISION OF REGULATORY GUIDANCE ON DESIGN GROUND MOTION SOL RS-RES-95-060 DUE 070795 POC Mary H. Mace, Contracting Officer, 301/415-7314 /Paulette Smith, Contract Negotiator, 301/415-6594 The Nuclear Regulatory Commission (NRC) requires technical assistance to develop revised regulatory guidance to characterize the vibratory ground motion used for nuclear power plant design. Vibratory ground motion will take into account engineering characteristics needed to consider linear and nonlinear design, liquefaction, secondary system response, spatial variation, and other pertinent effects. The contractor will (1) collect an earthquake strong ground motion time history database for use in developing response spectra and analyses, (2) develop recommendations for seismic design response spectra to be used for nuclear power plants considering engineering characteristics and different site and geographical conditions, and (3) develop recommendations for minimum power spectral density requirements for the proposed spectral shapes. These results will be included as technical input by the NRC staff in its revision of Regulatory Guide 1.60 entitled, ''Design Response Spectra for Seismic Design of Nuclear Power Plants'' (NRC, 1973) and associated standard review plan sections. The proposed period of performance is 3 years. Proposals for this requirement may be submitted by all concerns, i.e., large businesses, small businesses, and small businesses owned and controlled by socially and economically disadvantaged individuals. Notice to large busineses: The subcontracting plan requirements of P.L. 95-507 are applicable to this effort. Thus, all large businesses determined to be in the competitive range must be prepared to submit a detailed subcontracting plan. A source list comprising the names, addresses, and telephone numbers of all concerns requesting a copy of the solicitation, with large busineses identified by an asterisk, will be provided with the solicitation. In order to identify large businesses on the list, a request for the solicitation should indicate the size of the business based upon a SIC code of 8999. The size standard for this solicitation is average annual receipts for preceding three fiscal years not to exceed $3.5 million. In order to allow small concerns sufficient time to contact you for possible subcontracting opportunities, you are encouraged to make your request for the solicitation prior to the solicitation issuance date. A copy of the solicitation and all subsequent amendments will be provided to each requester. Interested firms should submit written requests for RS- RES-95-060. Telephone requests will not be honored. Closing date for proposals is 30 days after issue date of solicitation. (0144)

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