TXX-4263, Final Deficiency Rept Re Flooding Levels in Electrical Control Bldg Resulting from Fire Suppression.Initially Reported on 840717.Engineering Resolutions to Isolate Affected Drains Will Be Implemented by 840830

Final Deficiency Rept Re Flooding Levels in Electrical Control Bldg Resulting from Fire Suppression.Initially Reported on 840717.Engineering Resolutions to Isolate Affected Drains Will Be Implemented by 840830

ML20095H400
Person / Time
Site:	Comanche Peak
Issue date:	08/16/1984
From:	Clements B TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	Johnson E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
SDAR-141, TXX-4263, NUDOCS 8408280468
Download: ML20095H400 (2)

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\. AUG 2 01984 Mr. E.H. Johnson, Chief I Reactor Project Branch 1 U.S. Nuclear Regulatory Commission Office of Inspection & Enforcement 611 Ryan Plaza Drive, Suite 1000 Docket Nos.: 50-445 Arlington, TX 76012 50-446 COMANCHE PEAK STEAM ELECTRIC STATION -

FLOODING CONCERNS QA FILE: CP-84-17, SDAR-141 FILE N0.: 10110

Dear Mr. Johnson:

In accordance with 10CFR50.55(e), we are submitting the enclosed report of actions taken to correct a deficiency regarding flooding levels. This item was previously reported to your Mr. Doyle Hunnicutt on July 17, 1984.

Supporting documentation is available at the CPSES site for your Inspectors review.

Very truly yours, BRC:mm Attachment cc: NRC Region IV - (0 + 1 copy)

Director, Inspection & Enforcement (15 copies)

U.S. Nuclear Regulatory Commission Washington, DC 20555 Ohh5 PDR

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A DEVENDON OF TEXAN E*TELETIEN ELECTRIC COMPANY

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TXX-4263 August 16, 1984 ATTACHMENT Flooding Concerns Description During an engineering damage study analysis regarding an unrelated issue, the flooding levels resulting from fire suppression were established at twenty-two (22) and twelve (12) inches, respectively, for Rooms 113 and 115 A & B in the Electrical Control Building (Elevation 778'-0"). The sump pumps for these rooms are commonly located in Room 113 without provisions to isolate sump overflow from the sump pump of Rooms 115 A & B.

As a result of the installed configuration, the flooding level of the rooni with the lower level (Rooms 115 A & B at 12") could be exceeded as a re-sult of sump overflow.

Safety Implications -

A flooding level in excess of twelve (12) inches could incapacitate safety-related HVAC equipment (water chillers) essential to safe plant shutdown and operation.

Corrective Action TUGC0 has completed a reanalysis of flooding as a possible result of backflow from sump overflow. Engineering resolutions to isolate the affected drains (precluding flooding) have been prescribed and should be implemented no later than August 30, 1984.