SUBJECT: ACCEPTANCE REVIEW OF THE TOPICAL REPORT TITLED "EVIDENCE OF EXTREME EROSION DURING THE QUATERNARY PERIOD" AT YUCCA MOUNTAIN, NEVADA

The subject of this letter is the Nuclear Regulatory Commission's acceptance review of the U.S. Department of Energy's (DOE) Topical Report, Evaluation of the Potentially Adverse Condition of Extreme Erosion. During the Quaternary Period' at Yucca Mountain, Nevada, dated March 1993. This review was conducted in accordance with the guidelines established in the NRC Division of High-Level Waste Management Topical Report Review Position Paper (TRPP), provided to DOE on April 7, 1993. Additional details regarding the acceptance criteria used by the staff in making its findings are described in the following paragraph.