ML20132B532
| ML20132B532 | |
| Person / Time | |
|---|---|
| Issue date: | 03/02/1983 |
| From: | Rolonda Jackson Office of Nuclear Reactor Regulation |
| To: | Algermissen S INTERIOR, DEPT. OF, GEOLOGICAL SURVEY |
| Shared Package | |
| ML19264D658 | List: |
| References | |
| CON-FIN-B-8633, CON-NRC-03-83-105, CON-NRC-3-83-105, FOIA-85-353 TAC-49636, NUDOCS 8303170341 | |
| Download: ML20132B532 (6) | |
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, NUCLEAR REGULATORY COMMISSION '
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. MAR 0 2' 1983
, Dr. S. T. Algermissen U. S. Geological Survey P. O. Box 25046, M. S. 966 "
Denver, CO 80225
Dear Ted:
As you are aware,'we have been monitoring ongoing activities associated .
with Mt. St. Helens volcanic activity as it relates to WNP-3 and the -
Trojan nuclear power plant and other facilities in the region. The U. S. Geological Survey also has a contract related to volcanic hazards with the NRC Office of Research.
Recently, we were made aware by private sources of ongoing studies by '
the U.S.G.S.. F.E.M.A., and the U. S. Army Corps of Engineers. These studies deal with the geotechnical integrity of the natural dam that is .
impounding Spirit Lake, the potential for downstream mudflows, and seismicity related to the Mt. St. Helens Zone. A 1983 report ~
.~ (Water-Resources Investigation 82-4125), published by the U. S.
Geological Report, in cooperation with FEMA, addresses the mudfl.ow hazard associated with the hypothetica1 faibre of the Spirit f.ake - -
blockage. The authors of the report, Charles H. Swift III and '
David L. Kresch, are located at the USGS's Tacoma, Washington facilities. Because of the potential significance of this inforination to the Trojan and WNP-3 facilities, I am requesting that the U-$.
Geological Survey provide us with continuing update ~d ~information related to these ongoing or proposed studies. We request that this information be provided as a monthly letter report for the next six months with the first report due on April 1,1983. After that time, we will reassess any needed modification to this request. The effort for this activity '
should start immediately and be charged to Geosciences Case Reviews IV, ..
- ~ Task 1 - Advisory Services of Contract No. 03-83-105, FIN B8633. As
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soon as possible we will. forward a new task to cover this activity.
Dr. Stephan Brocoum, Leader, Geology Section, will be the contact for
- this activity._ H.g_c_an be. reached at FTS 301-492-4414.
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Sincerely, e
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Robert E. Jac on Chief Geociences an if Division of gineering
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Task 3 - ' Mount St. Helens Volcano - Spirit Lake Blockace
~ Technical Monitor: S. Brocoum Estimated Level of Effort: 0.10 SY (FY 83) 0.15 SY (FY 84) ,
0.15 SY (FY 85) 0.05 SY (FY 86) _--
Background ..
A heterogeneous mass of debris resulting from the 1980 eruption of Mount St. Helens has blocked the normal outlet channel of Spirit Lake.
This has impounded the lake and has created a potential flooding hazard to downstream inhabitants, communities and perhaps the Trojan Nuclear Plant. A report released in early 1983 by the U. S. Geological Survey '
addresses the postulated, controlled failure by piping (subsurface .
erosion) of this Spirit Lake blockage and the effect of the resulting water / debris mass on the Toutle and Cowlitz river valleys as far as the Longview/Kelso, Washington area at the confluence of the Cowlitz and Columbia rivers. The postulated impact of this debris mass on the '
Y Trojan Nuclear Plant located upstream on the Columbia River, about 5 miles from the Longview/Kelso region was not addressed in this report.
To mitigate the likelihood of the failure of the blockage by piping, the -
Corps of Engineers is attempting to stabilize the lake on a temporary basis by pumping and maintaining the lake at a level about 13 feet-below -
the easily erodable soil constituting a large portion of the crest of the blockage. In addition to the State of Washington, several Federal agencies including ~ the U. S. Army Corps of Eagineers, (COE) the ' . S. _ _
Geological Survey (USGS),- the U. S. National Weather Service (N . and the Federal Emergency Manacement Agency (FEMA), are involved in assessing the impact of a potential mudflow (debris) as a hazard.to residents downstream of the Spirit Lake blockage. Additional hlockage failure model studies may be conducted by_the U. Sr-Geological Survey including the postulated failure as a result of earthquake-induced liquefaction, perhaps producing a blockage breach and peak flow larger than that assumed to be associated with the postulated piping failure model. A number of permanent, engineered alternative methods of .
providing natural drainage to Spirit Lake have been proposed and are currently under review by the Corps of Engineers. Considering the -l
~potential hazard to the Trojan Nuclear Plant posed by the hypothetical [
failurt of the Spirit Lake blockage it is prudent that the U. S. Nuclear F I
Regulatory Commission be informed, on a timely basis of the status of the block _ age stability by an agency (the .USGS) directly involved in both !
the potential hazard assessment ~'8 Tid the develved.edt and-empleyment of an l ultimate solution to the problem. l Objective The objective of the task is to apprise the NRC staff on a monthly basis (more frequently if the situation warrants) of the stability of 1
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