ML17275A573

Forwards Addl Geologic Info Re Time of Latest Movements of Earth Faults on Gable Mountain Near Ctr of Reservation. No Conclusions Re Significance Have Been Reached & Info Is Not Considered Reportable Under 10CFR21

ML17275A573
Person / Time
Site:	Columbia, Washington Public Power Supply System
Issue date:	09/02/1980
From:	Renberger D WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Youngblood B Office of Nuclear Reactor Regulation
References
ELE-GCS-80-271, NUDOCS 8009090496
Download: ML17275A573 (7)

Text

REGULATORY NFORMATION DISTRIBUTION S TEM (RIDS)

ACCESSION NBR:8009090496 DOC ~ DATE: 80/09/02 NOTARIZED:

NO DOCKET ¹ FACIL:50-397 WPPSS Nuclear ProJectp Unjt 2i Nashjngton Publjc Powe 05000397 50-460 WPPSS NuClear PrOJeCtE Unit ir HaShjngtOn PubljC POWe 05000460 50-513

'HPPSS Nuclear ProJecti Unit 4i-Washington Public Powe 05000513 AUTH.NAME AUTHOR AFFILIATION zl, RENSBERGERiD.L.

Tfashington Public Power Supply System pl, RECIP ~ NAME RECIPIENT AFFILIATION YOUNGBLOODPB.J.

LIicensing Branch 1

SUBJECT:

Forwards addi geologic info re time of latest movements of earth faults on Gab]e Mountain near ctr". of reservatjon.

No conclusions re significance have been reached 8 info is not considered r'eportable unde(

10CFR21..

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Washington Public Power Supply System A JOINT OPERATING AGENCY P. O. BOX 988 3000 GEO. WANHINCTON WAY TTICHLANO, WAIHINCTON99352 PHONC (509) 375.5000 September 2,

1980 ELE-GCS-80-271 Docket Nos.

5Dg97 50-460/513 Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D.

C.

20555 Attention:

Mr. B. J.

Youngblood, Chief Licensing Branch 1

U

Subject:

NEW GEOLOGIC INFORMATION On August 15,

1980, a geotechnical consulting firm working for Puget Sound Power 8 Light Co.

on the Hanford Reservation, discovered addi-tional information which deals with the time of latest movement of earth faults on Gable Mountain near the center of the reservation.

Faulting on Gable Mountain was first studied in 1970 by the U.S.

Geological Survey (USGS) and the Supply System in conjunction with siting studies for the FFTF and WNP-2, respectively.

The area was later studied by the Supply System in 1973 and 1974 as part of the WNP-1/4 siting programs.

These faults are thought to have resulted from the forces which shaped all the ridges common to the Columbia

Plateau, over 40,000 years ago.

The findings of August 15 included minor offsets (less than four inches) that show displacement in flood gravels and clastic dikes of unknown, but probably late Pleistocene age.

From the information available at this time, it cannot be determined whether these offsets are due to minor continuation of tectonic activity which originally formed the mountain; soft sediment deformation asso-ciated with original implacement of the flood deposits; or some other phenomena, such as land sliding, which post-dates the flood deposits.

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No conclusions regarding the significance, if any, have yet been reached.

At this point, we do not consider the information reportable under 10CFR21.

The Supply System and Puget Sound Power 5 Light will coordinate further field investigation and will keep the Nuclear Regulatory Commission informed through normal licensing channels.

Mr. M. D. Lynch, lJNP-2 Licensing Project Manager, was advised of this finding via a telephone conversation with Mr. Sorensen, of our staff, on August 18, 1980.

A subsequent conference call between represen-tatives of the

NRC, USGS, Puget Sound Power 8 Light and the Supply System took place on August 19.

For'urposes of your records, we have attached a list of Supply System.and Puget Sound Power 8 Light represen-tatives who participated in the conference call.

Very truly yours, bk Attachment cc:

N. S.

Reynolds D&L D. L. Renberger Assistant Director, Technology

TELECON PARTICIPANTS IN WPPSS/PUGET NRC DISCUSSIONS OF 8 19/80 Jim Mecca--Puget Gordon Jacobsen--Puget Howard Coombs--Puget Consultant Richard Holt--Puget Consultant Donald Caldwell--Golder Associates Duane Renberger--WPPSS Ron Chitwood--WPPSS Alan Hosier--WPPSS Gerry Sorensen--WPPSS

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