ML19263D671

Summary of 790328 Meeting W/Puerto Rico Water Resources Authority in Bethesda,Md Re Site SER Seismology

ML19263D671
Person / Time
Site:	05000376
Issue date:	04/02/1979
From:	Froelich R Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 7904130122
Download: ML19263D671 (4)

Text

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w APR 2 1979 DOCKET NO.: 50-376 APPt.ICANT:

Puerto Rico Water Resources Authoority e

FACILITY:

-. North Coast Nuclear Plant Unit No.1 i

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SUBJECT:

SUPNARY OF MARCH 28, 1979 EETING TO REVIEW Tile STAFF SITE SAFETY EVALUATION REPORT - SEISMOLOGY ISSUES INTRODUCTION 1

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The NRC staff met with representatives of the Puerto Rico Water Resources Authority (PRWRA) on March 28, 1979, in the staff offices in Bethesda.

Maryland. The purpose of the meeting was to discuss the U. S. Geological Survey (USGS) Status Review of geology and seismology for the PRWRA Islote site for the North Coast Nuclear Plant (NORCO) Unit 1, and the staff's use of that review in arriving at a recommended seismic design level of 0.45 93 s...

BACKGROUND

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The USGS review of geology and seismology for the PRWRA's Islote site was received in December,1978. This was the last input needed to complete the staff's Site Safety Evaluation Report (SSER) for this site, and a final draft of the SSER'was completed and distributed for NRC staff approval on March 7. 1979. The USGS review has been transmitted to the NORCO hearing board and parties in February 1979, and PRWRA had also been infomally notified of the staff's recomended 0.45 g seismic design level. (PRWRA had proposed a 0.35 g level). PRWRA requested a meeting with the staff and the USGS to discuss the USGS status review and the staff's analysis (including the USGS data) leading to the recomended 0.45 g design level.

MEETING

SUMMARY

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PRWRA explained that they intend to make decisions affecting their long-range generation plans in April 1979. The status of NORCO i

site suitability will affect these plans, and PRWRA had requested this meeting in order to understand the basis for the USGS status report and the staff's reconnended 0.45 g seismic level.

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The staff and USGS position is that the data now available.do not provide adequate support for a 0.35 g seismic design level, but that it is possible that provision and analysis of additional data could lower the reconmended seismic design level below 0.45 g.

It was agreed'.that improtant factors to be considered in any further-

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submittal of seismic'adata would include the following:

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1.ocatic'n and association of the 1943 earthquake.

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Reco6putation of. the magnitude of the 1943 earthquake.

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Deve)opment of an attenuation model based on subduction

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Cdosideration of'an unspecified earthquake on an

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,3..:unsppified structure (the random earthquake).

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.J. BRWRA will'not contest the staff recossendation, and at this time.

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will proceed with their' consideration of NORCO Unit No.1 at the Islota site on the_ basis of a 0.45 g seismic design levele c,

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4.3 The staff $5ER will indicate that additional data, if available,

,o could result in decreasing the 0.45 g seismic design level.

It was understood that PRWRA could submit such additional data at the time that they submitted plant-specific design data for the staff facility review.,

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, l R. W. Froclich

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R. W. Froelich, Project Manager Environmental Projects Branch No. 1 5

Division of Site Safety and Environmental Analysis -

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