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

R -- AGE DATING OF GEOLOGIC MATERIALS--STATE-OF-THE- ART METHODOLOGIES APPLICABLE TO LICENSING OF NUCLEAR POWER PLANTS SOL NRC-04-94-041 POC Mary H. Mace, Contracting Officer, 301/415-/7314, Deborah Neff, Contract Specialist, 301/415-8160 The U.S. Nuclear Regulatory Commission intends to negotiate a sole source modification with William Lettis and Associates (WLA) for the completion of research entitled ''Age Dating of Geologic Materials - State-of-the-Art Methodologies Applicable to Licensing of Nuclear Power Plants'' under Contract No. NRC-04-94- 041. During Task 1 of the contract, Collection of Information, WLA identified sites, and during Task 2, Testing of New Methods, performed field and laboratory experiments at these sites to test the appropriateness and resolution of new procedures. However, due to the findings and experiences gained from performing Task 2, and in order to accomplish the main objective of this contract, it is necessary to perform additional tests to validate certain geochronological methods that show promise for application in future nuclear power plant site licensing activities. Also, the additional work will include a plan to gather samples and perform additional analyses to verify the results of samples now being analyzed in the laboratory to ensure that the ages of the materials sampled are from true fault scarps, and thus represent the times of occurrences of earthquakes, and not the ages of secondary slide blocks, which may not be seismically induced. Note 22 applies. (0107)

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