-

,_

Washington Public Power Supply SystemSom1223 Elma. WeeNngton 98641 1223 (2061442 4428

Docket No. 50-508

June 27, 1984G03-84-410

,

Director of Nuclear Reactor RegulationATTN: Mr. G. Knighton, ChiefLicensing Branch No. 3Division of Licensing ,U. S. Nuclear Regulatory Consnission ;Washirgton, D. C. 20555

Subject: NUCLEAR PROJECT 3NRC STRUCTURAL DESIGN AUDIT

,

References: a) Letter, A. Vietti to G. W. Knighton, dated 9/6/83b) Letter, G. W. Knighton to D. W. Mazur, dated

November 2, 1983c) Letter #G03-84-213, G. C. Sorensen to G. W. Knighton,

dated April 6,1984d) Letter V. Nerses to G. W. Knighton, dated June 15, 1984

On September 26, 1983 members of the NRC Structural Engineering and LicensingBranches arrived at the offices of the WNP-3 Architect / Engineer, Ebasco Ser-vices Inc., in New York City. The purpose of this visit was to commence aweek long audit as scheduled in reference a).

The Supply System hereby responds to those open items detailed in referenceb) which transmitted to the Supply System the NRC Staff reviewers AuditReport docuncting the results of the Audit exit meeting on September 30,1983. Also included in this package is a response to NRC Question 220.22.

As you are aware, the Supply System has made arrangements to meet with theresponsible NRC personnel in Bethesda and formally present these responses(ref.d).This meeting is scheduled for July 10, 1984. The focus of our presentation Iwill be on Audit Finding Number 1, though we will be prepared to discuss thefull range of our responses to the NRC's Structural Design Audit of WNP-3. .

00i

f*?'% %}$i

c,

.

Mr. G. Knighton, ChiefPage 2

NRC STRUCTURAL DESIGN AUDIT

Should you require additional information or clarification, the Supply Sys-tem point of contact for this matter is Mr. D. W. Coleman, Licensing ProjectManager (206/482-4428 ext. 5436).

Sincerely,

. .

G. C. Sorensen, ManagerRegulatory Programs

GCS/pm

cc: J. A. Adams - NESCOV. Nerses - NRCJ. Porrovecchio - Ebas a (NYO)N. S. Reynolds (Bishoo, Liberman, Cook, Purcell & Reynolds)D. Smithpeter - BPAS. F. Swearngin - SPAA. A. Tuzes - CEWNP-3 Files (703)

Attachments: 1. SEB Audit Finding No. 12. SEB Audit Finding No. 53. SEB Audit Finding No. 84. SEB Audit Finding No. 115. SEB Audit Finding No. 126. SEB Audit Finding No. 147. SES Audit Finding No. 158. SEB Audit Finding No. 179. SEB Audit Finding No. 18

10. SEB Audit Finding No. 1911. SEB Audit Finding No. 20 ,12. SEB Audit Finding No. 2113. SEB Audit Finding No. 2214. SEB Audit Finding No. 2315. SEB Audit Finding No. 2416. SEB Audit Finding No. 2517. NRC Question No. 220.22

.

. _ _ _ _ - - _ _ . _ _ _ _ - _ _ _ - - _ _ . _ - - - - - - - _ _ _ _ _ - _ _ _ _ - - _ _ _ _ _ _ _ _ _ _ _ _ _ . . - - _ - _ - . _ _ _ _ _ . _ _ _ _ . _ . _ _ _ _ . _ . _ _ . _ _ _ _ _ _ _ . _ _ - - _ _ _ . _ . - _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ _ _ . _ _ _ _ _ _ - - . _ - _ _ _ _ _ _ _ _ . _ _ _ _ _ _

.

WP-3 LICENSING DOCUMENTS

TRACKING SYSTEM

LEGENO

FSAR CHANGE NOTICESCN -

STATUSSTS -

80 - SUPPLY SYSTEM RESPONSE DEFERREDPC - PARTIAL COMPLETION OF RESPONSEC - SUPPLY SYSTEM CONSIDERS RESPONSE TO BE COMPLETE* - ComITE NT MADE IN THE SUPPLY SYSTEM RESPONSE IS BEING

TRACKED,

ITFM ID - SUPPLY SYSTEM INTERNAL TRACKING NLMBER

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AUDIT FINDING N0. 1

In order to proceed with the audit, it was decided to discuss with F.basco thedeconvolution analysis for the plant. This issue was previously raised inreview of the FSAR. Ebasco has applied the deconvolution methodology to afinite element model of the rock site. Since the rock is essentially elas-tic, in the range of interest, a reduction in motion at the base mat fromthat postulated at the surface would not be expected. In the analysis.credit was taken for such a reduction and the staff has disagreed that suchresults would not be expected for a rock site.

Accordingly, the staff will require that the recomendations of NUREG 0800,Section 3.7.2 will be followed. Specifically, either an elastic half-spaceanalysis should be performed to confirm the finite elements analysis, or thesite should be considered as a rock site, and a fixed-base analysis should beperformed. In any case, the full value of the SSE/0BE should be input at thebase mat without reduction.

RESPONSE TO FINDING NO.1|

An elastic half-space approach of seismic dynamic analysis of Category Istructures has been performed in response to the staff's request. The analy-sis results confirm the acceptability of the finite element / boundariesapproach employed for the WNP-3 seismic design. ,

The details of the elastic half-space analysis and comparison of the analysisresults to the WNP-3 design basis are presented in Attachment 1.

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