ML20246E452
| ML20246E452 | |
| Person / Time | |
|---|---|
| Issue date: | 05/08/1989 |
| From: | Lohaus P NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Matthews M ENERGY, DEPT. OF |
| References | |
| REF-WM-58 NUDOCS 8905110265 | |
| Download: ML20246E452 (2) | |
Text
{{#Wiki_filter:_. _ _ - _ _ 5 r j MAY 0 81909 Mr. Mark L. Matthews, Acting Project Manager Uranium Mill Tailings Project Office Albuquerque Operations Office Department of Energy P. O. Box 5400 Albuquerque, New Mexico 87115
Dear Mr. Matthews:
During an October 21, 1987 NRC site visit to the Shiprock, New Mexico site, we raised concerns regarding the thickness and placement of the erosion protection layer (letter from P. Lohaus to J. Arthur dated November 17,1987). In response to these issues, you have submitted documentation of investigations and analyses to demonstrate the adequacy of the Shiprock erosion protection. This documentation consists of " Evaluation of As-Constructed Riprap for Shiprock, New Mexico Site" transmitted by DOE letter dated December 5, 1988, and " Report and Analysis of Erosion Protection Investigation" and peak runoff calculations transmitted by DOE letter dated February 27, 1989. Based on our review of the information provided, we conclude that the data presented are adequate to demonstrate that the erosion protection at the Shiprock site meets the requirements of 40 CFR Part 192. The investigations are sufficient to show that the areas of exposed bedding, that appeared to have insufficient rock cover, actually contain rock which provides the required erosion protection. However, it should be pointed out that wveral of the photographs which were provided to document your observations are, by themselves, inconclusive. For example, the photograph taken at Excavation D3-1 is not clear enough to conclude that a 15-inch layer of rock exists. The photograph shows that a hole was dug to a depth of 15 inches but, because of shadows, it cannot be determined whether there is rock all the way to the bottom of the hole. In the case of Shiprock, we were able to reach our conclusions based on the written material provided. However, it would be helpful if photographs of any future investigations clearly document the conclusions presented. If you have any questions regarding our evaluation, please contact Dan Gillen of my staff at FTS 492-0557. Sincerely OR!Gi!E C::D BY Paul H. Lohaus, Chief Operations Branch Division of Low-Level Waste Management and Decommissioning, HMSS cc: R. Richey, DOE Albg. M. Abrams, DOE Albg. l )l 8905110265 890508 PDR WASTE WM-58 PDC gu+ Wm-se
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