ML19347B585
| ML19347B585 | |
| Person / Time | |
|---|---|
| Site: | Satsop |
| Issue date: | 10/06/1980 |
| From: | Renberger D WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Tedesco R Office of Nuclear Reactor Regulation |
| References | |
| GO3-80-2472, NUDOCS 8010150380 | |
| Download: ML19347B585 (6) | |
Text
{{#Wiki_filter:. W - P P W shington Public Power Supply System A JOINT OPERATING AGENCY S . ...... . _ .... .. _ . _ .. . _ ... ..._. _ ..... .__.<......._ October 6,1980 G03-80-2472 Docket Nos. STN 50-508 STN 50-509 U. S. Nuclear Regulatory Commission Division of Licensing Washington, D.C. 20555 Attention: Mr. R. L. Tedesco, Assistant Director, Licensing Gentlemen:
Subject:
WPPSS NUCLEAR PROJECT flUMBERS 3 AtlD 5 INFORMATION RELATIVE TO MT. ST. HELENS' ERUPTIONS Ref: Letter, R. L. Tedesco to D. L. Renberger, " Request of Geologic Information as a Result of Mount St. Helens," dated July 31, 1980.. The information you requested in the referenced letter is attached. Please contact me if you desire any discussion or clarification of the information provided. Very truly yours, M D. L. REtiBERGE Assistant Director, Technology bk cc: N. S. Reynolds, D&L W. Woods, NUS g
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- 360.0 Geosciences Branch i
j 361.1 Recent (1980) Mount St. Helens volcanism has resulted in i three major ash falls (May 18, May 25, and June 12) as well 1 as several smaller intennediate emissions. Describe (if i applicable), the effect (including ash thickness ranges) of 1 each of the above larger events, as well as any smaller ash j fall on the WPPSS 3 and 5 site. 4 j Response Recent Mt. St. Helens volcanism resulted in three major ash falls on , May 18, May 25, and June 12, 1980. Only the May 25, 1980 eruption , deposited ash at the WNP-3/5 site, which is located approximately 82 miles northwest of Mt. St. Helens. That eruption deposited approximately
- . 1/8 inch of ash at the site. The May 18, 1980 eruption's ash plume
- traveled in an east-northeast direction. The June 12, 1980, ash was j carried to the southwest by low altitude winds and to the north by
! high altitude winds. Consequently, no ash accumulations were measured
- at the WNP-3/5 site due to either the May 18 or June 12, 1980 eruptions.
) The only sijnificant effect at the WNP-3/5 site from the May 25, 1980, i ash fall was hazardous driving conditions due to rain mixing with the
; ash. Plant construction was halted temporarily to allow removal of j the ash from the construction and laydown areas. Please refer to our i July 9,1980, letter (from G. C. Sorensen to A. Bournia) for a more ! detailed description of clean-up activities.
1 i j 361.2 Based upon information obtained directly by the Washington i Public Power Supply System (WPPSS), or as reported by other, j provide a map of the area within at least a 50-mile radius
; of the WPPSS 3 and 5 units, showing the distribution and
i cumulative thickness of ashfall resulting from the recent ~ Mount St. Helens volcanism. Provide (if applicable) separating maps depicting the ash distribution and thickness of the May
- 18, May 25, and June 12 events within the same 50-mile
- radius.
l Resconse Attached are a ' series of ashfall isopach maps for the May 18, May 25, q and June 12, 1980, Mt. St. Helens' eruptions. I
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361. 3 Describe the effect, including thickness, duration of fallout, and elapsed time between eruption and ashfall at the site of each of the main ash fall events (or any intermediate site-affected events at the WPPSS 3 and 5 site.)
Response
Only the May 25, 1980, eruption of Mt. St. Helens deposited ash at the WNP-3/5 plant site. Ashfall thickness for the site region was highly variable due to the local surface winds and ranged from 1/16 to 1/4 inch. Workers at the WNP-3/5 construction site reported approximately 1/8 inch total ash accumulation. The May 25, 1980, eruption began at 0239 and the Portland weather radar reported that the ash plume had reached an altitude in excess of 40,000 feet by 0245. Residents near the town of Montesano (about five miles west of the site) reported that the ash began falling at approxi-mately 0700. Thus, the elapsed time between the eruption and the initial ashfall at the WNP-3/5 site (located about 82 miles northwest of Mt. St. Helens) was approximately 4 to 41/2 hours. Other effects are described in the response to question 361.1 References Washington Geologic Newsletter, July 1980, Volume 8, November 3, prepared by the Washington State Division of Geology and Earth Resources Korosec, M. A. , Rigby, J. G., and Stoffel, K. L. , The 1980 Eruction of Mount St. Helens, Washington, Part I: March 20 - May 19, 1980, Infor-mation Circular No. 71, Washington State Division of Geology and Earth Resources, June 1980. .
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