ML19289F676

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Discusses Present Status of Piping Sys Reanalysis.Reanalysis Complete & Two Hydraulic Snubbers Installed.No Pipe Is Overstressed in Event of Safe Shutdown Earthquake.Rept Supporting 790706 Request to Be Submitted by 790618
ML19289F676
Person / Time
Site: Beaver Valley
Issue date: 06/11/1979
From: Woolever E
DUQUESNE LIGHT CO.
To: Schwencer A
Office of Nuclear Reactor Regulation
References
TAC-11431, NUDOCS 7906150312
Download: ML19289F676 (3)


Text

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912) 4se-sooo 435 Sixth Avenue urgh, Pennsylvania June 11, 1979 Mr. Harold R. Denton .

Director of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Attention: A. Schwencer, Chief Operating Reactors Branch No.1 Division of Operating Reactors Washington, DC 20555

Reference:

Beaver Valley Power Statiotr, Unit- Nor 1 -

Docket No. 50-334 Status of Piping Reanalysis Program Gentlemen:

The purpose of this letter is to provide the present status of the reanalysis of the piping systems described in our April 2,1979 reply to the Nuclear Regulatory Commissions' March 13, 1979, " Order to Show Cause".

The pipe stress reanalysis has been completed and, with the installation of two hydraulic snubbers, no pipe is overstressed in the event of the occurrence of the safe shutdcwn earthquake. The reanalysis of the piping supports will be completed by the first week of July to the extent that we believe that no additional overstressed supports will be identified on the small nurber of piping systems for which the support rhanalysis will remain to be completed. This belief is based upon the experience gained in the reanalysis of the large nu=ber of supports that have been reanalyzed to date.

We have initiated the engineering and installation activities necessary to install two (2) additional hydraulic snubbers and to modify approximately fif teen (15) existing supports.

We intend to submit a report during the week of June 18, 1979 to support a request for station start up on approximately July 6,1979. At that time, all modifications that we consider necessary to assure the functional capability of the emergency core cooling, engineered safety features, and safe shutdown systems subsequent to the occurrence of the safe shutdown earthqude will be completed. Therefore, we will request the portion of the March 13,1979, " Order to Show Cause" which requires the station to remain shutdown to be rescinded, and that a return to operation be permitted upon the completion of the identified modificaticos.

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2230 121 3l l 790615 0 $/421 ,

Beaver Valley Power Station, Unit No. 1 Docket No. 50-334 Status of Piping Reanalysis Program Page During the approximately six to seven weeks of operation that are required to expend the remaining fuel in the first cycle of the nuclear core the remainder of the reanalysis of the piping supports on the systems

  • described in our letter of April 2, 1979 will be completed. All modifications of the pipe supports required to assure that stresses are within code allowable

earthquake will be completed during the first refueling outage that will commence as soon as the remaining six to seven full power weeks of nuclear fuel in the first cycle is expended.

Very truly yours, E. . Woolever Vice President, Engineering and Construction 2230 122

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. Mr. Harold R. Denton, NRC Status of Piping Reanalysis Program (CORPORATE SEAL)

Attest:

A/! :6&sm H. W. Staas Secretary COMM0hvEALTH OF PENNSYLVANIA)

) SS:

COUNTY OF ALLEGHENY )

On this // M day of 7 af , 1979, before me, DONAT3 W. ST-Tirreg , a Notary Public in and for said Commonwealth and County, personally appeared E. J. Woolever, who being duly sworn, deposed, and said that (1) he is Vice President of Duquesne Light, (2) he is duly authorized to execute and file the foregoing Stiomittal on behalf of said Company, and (3) the statements set forth in the Submittal are true and correct to the best of his knowledge, information and belief.

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DONALD W. SHANNCN, NOTARY pyggc PITTS2URCet ALLECHENY CCuhTy MY COMMIS$1CN EXPfRES JUNE 7.1383 Merter, Pt2sylvania Assocate of Nour'es 2230 123