ML19225C064

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Requests Termination of 790313 Order to Show Cause Re safety-related Piping Sys
ML19225C064
Person / Time
Site: Beaver Valley
Issue date: 07/23/1979
From: Dunn C
DUQUESNE LIGHT CO.
To: Harold Denton
Office of Nuclear Reactor Regulation
References
TAC-11431, NUDOCS 7907260438
Download: ML19225C064 (3)


Text

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435 Suth Avens P'ttsourgh. Pa 15219 July 23, 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 Washingtcu, DC 20555

Reference:

Beaver Valley Power Station, Unit No. 1 Docket No. 50-334 Request to Terminate the Commission's March 13, 1979 Order to Show Cause Gentlemen:

Our continuing review of the status of the reanalysis of sa ~ety related piping systems at the Beaver Valley Power Station has resulted in our concluding that the continuance of the Commission's March 13, 1979 Order to Show Cause is unnecessary.

All piping systems, which the present regulation require to be seismically analyzed, will be reanalyzed using Nu Pipe-SSI calculational techniques as described in Section 7 of the June 15, 1979 Report.

These NU Pipe-SSI computer analysis will then become the calculations of record for all piping systems which require computer analysis.

All supports for the computer analyzed problems will be evaluated or analyzed to include the requirements of IE Bulletin 79-02 relating to Laseplate flexibility and factors of safety for the concrete anchors.

Any modifications to the supports which are determined to be necessary as a result of these evaluations and analyses will be installed during the fall refueling outage.

Any modifications determined to be necessary :o limit equipment nozzle and containment penetration loads to within Code allowable values will be installed during this same fall refueling shutdown.

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7907260 438

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e' Beaver Valley Power Station, Unit No. 1 Docket No. 50-334 Request to Terminate the Commission's March 13, 1979 Order to Show Cause Page All hydraulic snubbers for which the seismic loading exceeds the c.llowable load but is included within the one event capability of the snubber will be identified. These snubbers will either be replaced or included in the appropriate technical specification as snubbers which must be tested for operability, subsequent to a seismic event of a magnitude which results in forces greater than the allowable snubber load prior to continuing operation or returning the unit to operation.

All of the above mentioned activities will be completed prior to returning toe unit to service after the fall refueling outage.

Wa, therefore, are providing three signed originals and 37 copies of this request to terminate the March 13, 1979 Order to show Cause.

Very truly yours, m

f' ll[ n ~ s-C. N. Dunn Vice President, Operations 413 239

(CORPORATE SEAL)

Attest:

E.W. Staas Secretary COMMONWEALTH OF PENNSYLVANIA)

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COUN'I'Y OF ALLEGENV )

On this 2S^ day of O c ' l- 7 ' , 1979, before me, DONALD W. SHAM 70N , a Notary Public in and for said Common-wealth and County, personally appeared C. N. Dunn, who being duly sworn, deposed, and said t mt (1) he is Vice President of Ducuesne I.ight , (2) he is duly authorized to execute and file the foregoing Submittal 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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/ ,s ,. w .a's b/ J f'. e , w -w DON A.LD W. SHANNON. NOT?.RY PUBLIC PITISSURCH, ALLECHENY COUNTY MY COMMIS$lCN DPIRES JUNE 7,1933 Member, Pennsylvania Assoc;aton of hotaws 413 gg