ML20040E466

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Confirms 810928 Telcon Re Potential Problem in Analysis of Piping Sys Contained in Annulus Area of Containment Bldg. Review to Determine Acceptability of Data Used for Seismic Analysis,In Progress
ML20040E466
Person / Time
Site: Diablo Canyon  Pacific Gas & Electric icon.png
Issue date: 09/28/1981
From: Grove P
PACIFIC GAS & ELECTRIC CO.
To: Engelken R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML16341B724 List:
References
FOIA-81-406 NUDOCS 8202040372
Download: ML20040E466 (1)


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. t.7.nf*t September 28, 1981

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Mr. R. H. Engelken, Director of fice of Inspection and Enforcement Region V U. S. 4uclear Regulatory Conmission 1990 N. California Boulevard Walnut Creek Plaza, Suite 202 Walnut Creek, CA 94596

Dear Mr. Engelken:

September This will confirm our telephone notification of your office on of piping systems 28,1981. at 12:30 p.m. of a potential problem in the analysis -

contained building. This report is in conformance in the annulus area of the containment section 6.9.1.12.i. A review is in progress with technical specification to determine the accept-

- ability of data used for seismic analysis in the annulus area. The results of this review should be available in 7 to 10 days and correc-ttve actions, if required, will then be determined. Fuel Toading will be delayed until a resolution of those items necessary for fuel loading are completed and concurrence is obtained from the NRC. We will keep you informed of progress during the review.

Very truly yours,,

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cc: . Service List

/ ENCLOSURE 2 PRE 1.*MINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-V. 81-50 DA Sept. 23,19?

This preliminary notification constitutes EARLY notice of events of POSS E safety or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by IE staff on this date.

Licensee Emergency Classification: l Facility: Pacific Gas & Electric Company Notification of unusual Event Diablo Canyon Unit Nos.1 & 2 Alert Site Area Emergency Docket Nos. 50-275 & 50-323 General Emergency San Luis Obispo County, California Not Applicable x

Subject:

INOPERABILITY OF THE RESIDUAL HEAT REMOVAL (RHR) SYSTEM - INCORRECT SEISMIC ANALYSIS I On Sept.nber 27.1981, at 4:30 p.m., the Plant Superintendent informed the resident inspectors of a potential problem with the seismic analysis of the RHR System. The following day,' 4 September 23. 1981, during a morning meeting, the licensee informed the resident inspectors that apparently the Unit 2 piping drawings between the containment wall and the missile shiold had been used in the seismic analysis of the Unit 1 piping. Consequently, the licensee has concluded that the RHR System (and possibly other piping in this area) has not been i-properly analyzed and that the RHR System is inoperable at this time. The licensee has F not loaded any fuel in the reactor at this time and has deferred fueling operations until this issue is resolved.

Media interest is expected. Neither the licensee nor the NRC plans to issue a news release. '

Region V (San Francisco) neceived notification of this occurrence from the residant inspector at 9 a.m. on September 28, 1981. This infomation is current as of 10:00 a.m.

. on September 28, 1981.

CCNTACT: P. J. Morrill. 463-3740 T. Young, Jr., 463-3853 l

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