ML20009B860

Forwards Summary of 810512 Meeting W/Westinghouse & BNL Re Seismic Qualification of Accumulators.Resolution of Two Areas of Concern Described.Subj Considered Closed

ML20009B860
Person / Time
Site:	Summer
Issue date:	07/10/1981
From:	Nichols T SOUTH CAROLINA ELECTRIC & GAS CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
NUDOCS 8107170257
Download: ML20009B860 (15)

Text

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SOUTH CAROLINA ELECTRIC a GAS COMPANY POST OFFICE BOX 764 COLUMBIA, SOUTH CAROLIN A 29218 T. C. NicHc,Ls, J R.

g wu p.uiamo c.ov. cuwmc July 10, 1981 p

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Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation g

U. S. Nuclear Regulatory Commission y

Washington, D.C.

20555 v9 hf

Subject:

hrgil r. S".mmer.

r' Station Docket No. 50/395 SER Item 1.7.21 Seismic Qualificailon of Equipment

Dear Mr. Denton:

During the Seismic Qualification Review ream Audit (SQRT) of the Virgil C.

Summer Nuclear Station documentation for the seismic qualification of accumulators was not available at the site due to insufficient notification.

In order to complete the review of the seismic qualification of the accumulators a meeting was held on May 12, 1981, between Westinghouse and Brookhaven National Labs (NRC consultants). The purpose cf this meeting was to discuss and review the seismic qualification of accumulators supplied by Westinghouse for the Virgil C. Summer Nuclear Station. A detailed summary of the meeting is provided in Westinghouse Trip Report NS-S&ESE-8177 (Attachment A).

As a result of the subject review the NRC consultant identified two areas of cacern as follows:

1.

The computer input and output for the modal analysis performed by Westinghouse was not uvailable at the meeting.

r 2.

There was no one document which tied together all the analyses and j

reports used to demonstrate qualification of the Virgil C. Summer accumulators.

In order to resolve these concerns Westinghouse has initiated the actions described below which were deemed acceptable by the NRC consultant.

Relative to the first concern, a simplified model of the modal analysis is provided in Attachment B and the computer input and output for the modal analysis is provided in Attachment C.

Relctive to the second concern, Westinghouse has revised l

Calculation Note 34-17-1 to contain a summary statement identifying the analyses l

and reports used to demonstrate seismic qualificaton of the Virgil C. Sumner Nuclear Station accumulators. The summary information contained in the cal-culation note is similar to the information described on the second page of i

Attachment A.

i l

Based on the above information, the n bject of seismic qualification of the Virgil C. Summer Nuclear Station accumulators is considered closed.

If you l

have any questions or concerns please contact us.

l l

l l{ed 8107170257 810710 M{

PDR ADOCK 05000395 A-PDR

Mr. Harold R. Denton July 10, 1981 Page 2 Very truly yours, T. C. Nichols, Jr.

RBC:TCN:lkb cc:

V. C. Summer I

G. H. Fischer H. N. Cyrus T. C. Nichols, Jr.

Dr. J. Ruoff D. A. Nauman W. A. Williams, Jr.

R. B. Clary O. S. Bradham A. R. Koon l

M. N. Browne B. A. Bursey i'

J. L. Skolds J. B. Knotts, Jr.

Dr. M. Reich NPCF File I

i l

i

MTWELGCM 4

TRIP / CONFERENCE REPORT W8SlIlghDUS$ B0CtlIl Cal]MK8 TIE

,cPoRu m ENo..

voeu swse NS-SWRF A1177 QATE PREPAREQ c_ic_o1 TRIP TQ LOCATION Q ATE (5) CP TRIP Brookhaven Labs long Ttlanri_ NY E M 1_17 /A1 P.Q.J NEQQTI A TIO N CON F R ACT PUNPOSE*

To review seist;ic qualification of accumulator vessels for Virgil Sumer (CGE) plant s.o.esuQoET No..

S U M M A R Y / ACTIQN

• 1.

As a fo11cw-up to the SQRT audit of the Virgil Sumer (CGE) site an NRC consultant (Brookhaven Labs) conducted a review of the seismic qualification of accumulators.

2.

During the review the Westingheitse seismic qualification methods were discussed in detz and several reports were reviewed.

3.

The seismic qualification was acceptable with the exception of the following two items:

a.

the consultant requested review of the computer run for the modal analysis.

b.

there was no one document; which tied together all the analyses and reports used to demonstrate qualification of the CGE accui:slators.

4.

Westinghouse agreed to provide the computer input and results for the modal analysis-along with a sketch of the accumulator model, and to pursue the concern raised relative i

l to documentation.

4 m

,m PERsGreS PRESENT (NAME/ TITLE /ORGJDIVJOEPTJGROUPl*

J. J. McInerney, W S. Hyde, W J. Curreri, Brookhaven A THOR SIGN AWRE

• QATE NOTHING IN THIS REPORrSHAt.L SE CONSTRtJED TO CHANGE ANY M

c/22/6/

' a **"" =c' c="* o a '" 'c"

""#vf3"E ma'#ENr AME & TITt.El DISTRIBUTION

• J. J. McInerney S. Hyde, 3 F. Manger, 4 D. Alexander, PC 2 J. Curreri, Brookhaven Labs J. Reid, 3 D. Rawlins, 4 R. Kelly, PC 2-R. Clee-ly, SCE&G J. Pandya, 3 G. Butterworth, 4 J. Cookingham, 5 e

_________ _ PAcaiep y

4 t,

?

i Details of Trio l

A.

Background

l During the SQRT audit at the Virgil Sumer site the accumulators:yere identified as a component which would be audited.

Since this coinpanent was not identified prior to the audit and seismic qualification documenta-tion was not available at the site during the audit.

Subsequent to the audit a SQRT' Form was prepared for the accumulators and submitted to the NRC. After receipt of the SQRT Form the NRC requested copies of the seis-mic qualification documentation for review by their consultant, Brookhaven Labs.

In lieu of submitting the proprietary documentation, Westinghouse arranged to meet with Brookhaven consultants to discuss the Westinghouse seismic qualification methods and review the appropriate seismic qualifi-cation documentation.

B.

Discus'sion of Seismic Qualification l

The seismic qualification methods were discussed in detail for the accumu-latcrs. The basic qualification consisted of a static analysis by the vendor (Delta. Southern) to generic g levels identified in the equipment l

specification. The vendor analysis was documented in a design report and reviewed during the meeting. To supplement the vendor analysis Westinghouse performed a two dimensional modal analysis to determine the natural frequencies. The g valves at the predominent calculated natural frequency were then obtained from the appropriate Virgil Sumer response spectra and compared with the generic qualification levels useo by the vendor to demonstrate the acceptability of tha vendor qualification. The consultant reviewed the results of this analysis as documented in Calcula-tion Note 34-17-1 dated 1/3/77. The consultant was also interested in reviewing the computer run for this analysis.

However, this information was not available at the meeting. To further demonstrate the accepability of the Westinghouse methods for determining natural frequencies the test-ing perfomed at Diablo Canyon (WCAP 9478) to verify analysis techniques was discusned and reviewed.

l The last step in the qualification process was to demonstrate that the two dimensional analysis perform for the accumalators satisfied the require-l ment for three dimensional seismic analysis which was imposed on the Sumer plant after the initial accumulator seismic analysis was com-pleted. This was accomplished by comparing the g valves obtained in the two dimensional analysis with the information in WCAP 8230 which provides a generic meth.od for making such a comparism.

Based on the above described review by the Brookhaven consultant, the seismic qualification of the Virgil Sumer accumulators were deerred acceptable pending review of the computer run for the modal analysis. The consultant did express an additional concern which related to determining the applicability of all the documentation reviewed to the Virgil Sumer accumulators. Westinghouse agreed to take action to resolve both of these concerns.

y

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