ML20149L586

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Summary of 871221 Meeting W/Util in Bethesda,Md Re Licensee Proposed Methodology to Develop New Seismic Floor Response Spectra.Attendance List Encl
ML20149L586
Person / Time
Site: Oyster Creek
Issue date: 02/16/1988
From: Dromerick A
Office of Nuclear Reactor Regulation
To:
Office of Nuclear Reactor Regulation
References
NUDOCS 8802240300
Download: ML20149L586 (4)


Text

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  • Docket No's: 50-219 FEB 16198g LICENSEE: GPU Nuclear Corporation FRCM: Alexander W. Dromerick, Project Manager Project Directorate I-4 Divisicn of Reactor Projects I/II

SUBJECT:

SilMMARY OF DECEMBER 21, 1987 PEETING WITH GPU NUCLEAR CORFORATION (GFl;h) 10 DISCUSS MATTERS RELATED TO NEW SEISHIC FLOOR RESPONSE SPECTRA FOR OYSTER CREEK NUCLEAR GENERATING STATION On Monday, Deceuber 21, 1987 a neeting was held at NRC, Pethesda, t'aryland with GPUN (the licensee) to discuss the licensee's proposed mcthodology to develop new seismic floor response spectra for the Oyster Creek Nuclear Generating Station. Attachn<nt 1 is the list of individuals participating in the discussion.

The following is a sunnary of the items discussed.

A detailed discussion was held regardirg our letter to the licensee dated recember 16,1987 (Attachment 2) concerning the two options reconmended by the staff for use by the licensee for future seismic qualification work at the Oyster Creek Generating Nuclear Station. As a result of the discussion, our letter of Decerrber 16, 1987 was nodified to include a sub option under option 1(i.e. to use the SEP site specific spectra at the foundation level).

With respect to Option 2, details regarding the consistency of the site specific analysis were discussed. The staff provided the licensee with appropriate guidelines to be used for any of the options selected by the licensee.

Alex N M E Project Manager Project Directorate I-4 Division of Reactor Projects I/II

Enclosures:

As state-d cc w/ enclosures See next page DISTRIBUTION IfoWet File NRC & Local PORs PDI-4 Gray File SVarga BBoger SNorric ADror.erick OGC EJordan JPartlow ACRS(10) k[k y yMck: e 1m $

zipc8 2 maamg!m"&

P

Mr. P. B. Fiedler Oyster Creek Nuclear Oyster Creek Nuclear Generating Station Generating Station e e.

cc: Resident Inspector Ernest L. Blake, Jr.

Shaw, Pittman, Potts and Trowbridge c/o U.S. NRC 2300 N Street, NV Post Office Box 445 Washington, D.C. 20037 Forked River, New Jersey 08731 J.B. Libeman, Esquire Connissioner Bishop, Liberman, Cook, et al. New Jersey Department of Energy 1155 Avenue of the Americas 101 Comerce Street New York, New York 10036 Newark, New Jersey 07102 Mr. David M. Scott, Acting Chief Regional Administrator, Region I Bureau of Nuclear Engineering U.S. Nuclear Regulatory Comission Department of Environmental Protection 631 Park Avenue CN 411 -

Trenton, New Jersey 08625 King of Prussia, Pennsylvania 19406 a

BWR Licensing Manager GPU Nuclear Corporation

6. 1 Upper Pond Road Parsippany, New Jersey 07054 Deputy Attorney General State of New Jersey Department of Law and Public Safety 36 West State Street - CN 112 Trenton, New Jersey 08625  :

Mayor l l

Lacey Township .

818 West Lacey Road '

Forked River, New Jersey 08731 Licensing Manager

- Oyster Creek Nuclear Generating Station Mail Stop: Site Emergency Bldg. '

P. O. Box 388 Forked River, New Jersey 08731 l

( ATTACHMENT 1 ATTENDANCE LIST OYSTER CREEK hilCLEAR GEt'.ERATING STATION DECE!'BER 21, 1987 - MEETING NAME ORGANIZATI_0N Alexander Dromerick NRC/NRR/ Project Manager, PDI-4 Hans Ashar NRC/NRR/ DEST /ESGB Robert L. Rothman NRC/ESGB Leon Reiter NRR/ESGB Morris Reich BNL A.T. Phillippalopols BNL P. Tatnaik State of N.J.

E. F. O'Connor GPUN L. E. Malik URS/Blume A. P. Rochino GPUN Y. Nagai GPUN G. Capoanno GPUN C. P. Tan NRR/ESGB Leon Garibian GPUN George Klimkiewicz Weston Geophysical Richard Holt Weston Geophysical

- .~. _ _ _ . . . _ _ . _ . . _ _ _ ._

I MEETING

SUMMARY

DISTRIBUTION D6EketiEil's-NRC PDR Local PDR PDI4 Gray File S. Varga B. Boger J. Stolz A. Dromerick OGC E . - Jo rdan J. Partlow ACRS (10)

GPA/PA HBClayton NRC Participants Alexander Dronerick Hans Ashar Robert L. Rothrr,an Lecn Reiter C. P. Tan

ATTACHMENT 2 '

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1JNITED STATES g

  1. '  % NUCLEAR REGULATORY COMMISSION umsmworow, o. c. soses g

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DEC16 Hg7 l Mr. P. B. Fiedler e j

Vice President and Director Oyster Creek Nuclear Generating Station )

Post Office Box 388 Forked River, New Jersey 08731

Dear Mr. Fiedler:

SUBJECT:

METHODOLOGY TO DEVELOP NEW SEISMIC FLOOR RESPONSE SPECTRA FOR OYSTER )

CREEK NUCLEAR GENERATING STATION On Novent>er 17 and 18,1987 the staff conducted an audit at URS/Blume in San Francisco, California, concerning the soil structure interaction (SSI) ~.

analysis. GPU Nuclear Corporation plans to use the analysis for developing l the floor response spectra for future work at the Oyster Creek Nuclear i

Generating Station. As a result of the audit, the staff concluded that in

- general the methodology used was appropriate. However, the staff has certain i concerns regarding the site specific spectra and its usage.

As discussed during the teleconference on this subject on December 10, 1987, '

the staff is recossending two options for use by the licensee for future l seismic qualification work at tie Oyster Creek Nuclear Generating Station. For )

the optt.on selected, the licensee is requested to provide the study results )

which account for the following factors prior to implementation.

. I

1. Variations in soil properties
2. Modelling uncertainties
3. Cosputational parameters and their limitations
4. Verification and validation of computer code with the measured results
5. Power Spectral density for the time history being used
6. Effect of saturated soil
7. Torsional effects on structures ,

Option 1 (a) Use the 0.75 SEP design spectra (Regulator'y Guide 1.60 shaped spectra) in the free-field at foundation level.

(b) Use the design spectra compatible ground motion applied at the bottom ,

of the first soft soil layer (i.e. E1.6'-0"). The design spectra cospatibility may be established via use of a properly verified , ,

computer code such as SUPER FLASH ,

(c) Perform the appropriate SSI analysis.

(d) Limit the maximum reduction in the basemat spectral e%1 nates from those of design spectra to 255.

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Option 2  ;.j (a) Use the proposed revision to SRP Sections 2.5.2, 3.L .7.2 (alternate 2) and 3.7.3 consistently to perform response analysis. In context, the licensee is advised to develop a free-field site-specific W aotion for the Oyster Creek site.

Thesuiteofrecordschosenshouldbethosefrommagnitude(rgk9)1ocalsite 5.3 i (0.5 or less) earthquakes at distances less than 25km at sites whos conditions are similar to the Oyster Creek site. If such records are not available, a suite of site specific rock records should be assew6 led where point of input is at hypothetical rock outcrop. If possible both approaches should be used, and postulated ground motion should be compared (after appropriate deconvolution) at cosenon reference points (e.g. soil surface,

't bottom of foundation). As in past licensing applications of site specific spectra, there should be coordination with the staff to avoid misunderstandings and delays. . ,

(b) This input should be used for a detailed SSI analysis r

i If Option 2 is selected, the results of the analysis will be evaluated by the staff to (1) assure consistency of various elements (e.g. input motion, SSI) with each other, (2) assure consistency with physically reasonable phenociena and (3) determine limitations if necessary, that need to be applied to its j

application.

The reporting and/or recordkeeping requirements contained in this letter affect fewer than 10 respondents; therefore, OMB clearance is not required under P.L.96-511.

Sincerely, Alexander W. Dromerick, Project Manager Project Directorate I-4 Division of Reactor Projects I/II cc: See next page r- ;t

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