ML20213E325
| ML20213E325 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 02/07/1983 |
| From: | Rolonda Jackson Office of Nuclear Reactor Regulation |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| CON-WNP-0565, CON-WNP-565 NUDOCS 8302160437 | |
| Download: ML20213E325 (2) | |
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._j DISTRIBUTION:
FG 9 ? ^33 t'Ef'n"A!TUti FCP:
Al Schwencer, Chief Licensirg Branch t'c 2, DL FP0t':
Pebert E. Jackson, Chief Geosciences Branch, DE
SUBJECT:
GE0 LOGY INPUT TO WilP-2 OL-SER SUPPLE"ErtT NO. 3 Attached is the genlogy input to Supplement No. 3 of the '<NP-2 OL-SEP.,
closing confirmatory issue 1.8 (24) of Supplenent flo.1, relatino to the design basis ashfall.
It is concluded that the newer esticates of unccrpactad ash thickness and rate of fall over a 20-hour period are adaquately conservative in providinq for the operatino safaty of the plant.
I# there are any ouestions, please contact Dr. Ina C. Alterran, neology reviewer for UNP-2.
Original Si:::ed by R.E. Jackson Robert E..lackson, Chief Geosciences Branch Division of Enginearing
Attachment:
As statrd cc: w/attachnent J. Knight S. Brocoum
- 1. Alterman J. Kirball R. Auluck C. Moon
- 4. Lefevre A. Ibrahim T. Hait, USGS D. Dickey, USGS V. Hays, USGS XM LTu' 302160437 830207 W ADOCK 05000397
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Supplement No. 3 - SSER for WNP-2 2.5.1.3 Volcanic Hazards 2.5.1.3.1 Ash Fall In the OL-SER, Supplement #1, the staff and the United States Geological Survey (Appendix G) indicated that the FSAR estimates of ash fall uncompacted thickness and rate of fall fell short of more recently developed estimates by the United States Geological Survey based on experience with the recent Mt. St. Helens eruption.
While the compacted design thickness chosen (7.4 cm or 3 in) was considered conservative, the uncompacted thickness was based on earlier estimates of 20%-40% compaction of loose ash.
As was pointed out by the USGS, p. G-11 of the SSER, a compaction factor of up to 75% was measured for the May 18, 1980 lit. St. Helens.
While the validity of this latter figure had not been determined at the time of the SSER writing, it was considered prudent to use a more conservative estimate than the 20-40%,
somewhere between 50-60%.
This figure would result in a maximum of 18.5 cm (7.4 in) of loose ash.
The rate of ashfall for a 20-hour period, based on the earlier FSAR percent compaction estimates,.37 cm/hr (.15 in/hr), would result from the compacted thickness of 7.4 cm (3 in). Therefore a higher rate based on the more recent uncompacted ash estimates was suggested, the average being.92 cm/hr (.36 in/hr) and the maximum 1~.1 cm/hr (.44 in/hr) for the Katmai Volcano rate.
'ased on these differences between the applicant's estimates on the one B
hard, and that of the NRC Staff and the USGS on the other, the applicant committed to set up a task force to evaluate and recommend a plan to incorporate the new information.
In October,1982, the applicant submitted a supplement using the maximum compacted (3 in) and uncompacted (7.4 in) esh fall thickness and the averace and maximum rates (.35 in/hr and.44 in/hr respectively) for the design basis ash fall.
The new figures have resulted in proposed revisions to operating i
procedures and equipment modifications that are addressed in sections of this supplement.
l The staff agrees that the newer estimates for uncompacted ash fall thickness and rate of ashfall are adequately conservative in providing for the safety of the plart.
.t' DISTRIBUTION:
See attached page FEB 8 1933 Docket No. 50-397 MEff0RANDU;1 FOR:
A. Schwencer, Chief Licensing Branch flo. 2 Division of Licensing FROM:
R. Auluck, Project Panager Licensing Branch No. 2, DL
SUBJECT:
FORTi!COMIflG MEETIllG WITH WASHINGTON PUBLIC POWER SUPPLY SYSTEM (WPPSS)
DATE & tit'E:
February 15,16 and 17,1983 8:30 AM LOCATION:
WPPSS Headquarters 3000 George Washington Way Richland, Washington PURPOSE:
Environrrental Equipment Qualification Audit PARTICIPANTS:
NRC EG&G WPPSS A. Masciantonio R. Halloway R. Nelson &
J. Kennedy T. Humphrey Support Staff R. Auluck Q. Ibcker Original signed by:
R. Auluck, Project f'anager Licensing Branch ?!o. 2 Division of Licensing cc: See next page 830208 PDR ADOCK 03000397 A
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WNP-2 Mr. R. L. Ferguson Managing Director Washington Public Power Supply System 4
P. O. Box 968 3000 George Washington Way Richland, Washington 99352 cc:
Nicholas Reynolds, Esquire Debevoise & Liberman 1200 Seventeenth Street, N. W.
Washington, D. C.
20036 Mr. G.E. Doupe, Esquire Washington Public Power Supply System P.O. Box 968 3000 George Washington Way Richland, Washington 99352 Nicholas Lewis, Chairman Energy Facility Site Evaluation Council Mail Stop PY-ll Olympia, Washington 98504 Roger Nelson, Licensing Manager Washington Public Power Supply System P.O. Box 968 Richland, Washington 99352 Mr. W.G. Conn, Sr. N/M Group Supervisor Burns and Roe, Incorporated 601 Williams Boulevard Richland, Washington 99352 Mr. Richard Feil U.S. NRC Resident Inspector WPPSS-2 NPS P.O. Box 69 Richland, Washington 99352 Dr. G.D. Bouchey D;puty Director, Safety & Security Washington Public Power Supply System P.O. Box 968, MD 650 Richland, Washington 99352 i
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