ML20137B012

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Forwards YAEC-1492, Fire Water Tank Seismic Analysis, Replacing 830926 Submittal,Prepared as Partial Resolution of SEP III-6.Rept Resubmitted Due to Use of Incorrect Allowable Anchor Bolt Stresses
ML20137B012
Person / Time
Site: Yankee Rowe
Issue date: 01/06/1986
From: Papanic G
YANKEE ATOMIC ELECTRIC CO.
To: Lear G
Office of Nuclear Reactor Regulation
Shared Package
ML20137B017 List:
References
TASK-03-06, TASK-3-6, TASK-RR FYR-86-001, FYR-86-1, NUDOCS 8601150021
Download: ML20137B012 (1)


Text

. .

'ph o"' (* ") * ' -* ' 0 0 YANKEE ATOMIC ELECTRIC COMPANY TWX 710-380-7619 t

1671 Worcester Road, Framingham, Massachusetts 01701 2.C.2.1 y gd ) FYR 86-001

,f/JJKUE '

January 6, 1986 United States Nuclear Regulatory Cornmission Washington, DC 20555 Attention: Mr. George E. Lear, Director PWR Project Directorate No. 1 Division of PWR Licensing-A

References:

(a) License No. DPR-3 (Docket No. 50-29)

(b) Letter, YAEC to USNRC, dated September 26, 1983

Subject:

SEP Topic III Fire Water Tank Seismic Analysis Report

Dear Sir:

Yankee submitted a report via Reference (b) which presented the results of a seismic analysis of the YNPS fire water storage tank. This report was prepared by Cygna Energy Services as partial resolution of SEP Topic III-6.

Subsequent to our submittal of this report for your review, a routine quality check revealed that incorrect allowable anchor bolt stresses had been used in the analysis. This discrepancy in bolt stress does not affect the original design qualification of the tank, only the seismic evaluation.

After learning of the bolt stress discrepancy, we elected to perform our own seismic evaluation of this tank using the methodology presented in NUREG/CR-ll61. Our report, YAEC-1492, is attached and replaces Reference (b). The tank was evaluated for both YCS and NRC equivalent seismic events. The tank and its supporting structure will remain within code design allowable limits if subjected to seismic loadings based on either spectrum.

Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY Jr.

Senior Project Engineer Licensing CP/glw Attachment .

b B601150021 860106 I PDR ADOCK 05000029 g F PDR

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