ML19330C020

RO 80-26:water Seal for Piping Penetration in Refueling Water Storage Tank Pipe Tunnel Does Not Meet Design Requirements.Plugged Yard Storm Drain Caused Water Backup. Repairs to Water Seal Will Be Evaluated

ML19330C020
Person / Time
Site:	Millstone
Issue date:	08/01/1980
From:	Mroczka E NORTHEAST NUCLEAR ENERGY CO.
To:
References
MP-2-4441, NUDOCS 8008070429
Download: ML19330C020 (2)

Text

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4 August 1 1980

. 77-2 444I ri. Egyce R. Crier 53 W . Elt3fon I .

Cffice of Inspection and Enf'o ..C .

O. S. MbecTear ReguTatory cannissiam .

631 Park Avenue King of Prussia. PennsyTvania 19406

Reference:

Facility Operating License P . DPR-65 Docket No. 50-336 Reportable Occurrence 50-336/80-26

Dear Mr. Grier:

This letter provides notification of Reportable Occurrence 80-26 pursuant to the requirteents of Hillstone Unit 2 Appendix A Technical Specf ficatioss Lection 6.9.1.8.1. The report concerns the discovery of conditic% not specificaTTy considered in the SAR or Technical Specifica'.fons that require rcredtal action or corrective reasures to ;rever t the existence or developcent of an unsafe cortdition.

As a result of the engineering investigation of rainwater inteakage to the Auxiliary Building during the storm of July 29,1980 it has been determined that the water seal for the piping penetrations in the Refueling Water Storage Tank pipe tunnel does not peet the design reruired by Technical specification 5.1.3. A plugged yard .

stons drai n caused a water backup and the centioned inieakage resulted in approximately eighteen inches of standing water in the lower level of the Auxfif ary Bufiding. No safety related equipment was Jeopardized.

Repatrs and/or modifications to the water seal are being evaluated and wiTT be cts:rpieted as soon as possible. Interim instructions have been provided to monitor the storm drains and Tower Auxiliary

Buildtng levels during future rain storms.

00h THIS DOCUMENT CONTAINS D /4 POOR QUAL.lTY PAGES 8008070439.. - -

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', Further infomation w111 be prowIded in the two wek report.

Yours truly, NORTHEAST NUCl. EAR ENERGY C0fiPANY WS - 8 Edward J. H czka Station Superintendent Millstone t;uclear Powar Station EJM/JJK:lis cc: Of ructor Office of Management Infomation and Program Control.

Washington, D.C. (2)

U. S. riuclear Regulatory Commission, c/o Doctr.ent Man.genent Brands, Washington, D.C. 20555

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