ML20105A842

Forwards Rev 0 to PTR-32, Comanche Peak Steam Electric Station Unit 2 Engineering Bwip Check Valve 2AF-0083 Failure Investigation. Rept Documents Failure of Check Valve During Preoperational Testing

ML20105A842
Person / Time
Site:	Comanche Peak
Issue date:	08/11/1992
From:	William Cahill, Walker R TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	Yandell L NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20105A845	List: ML20105A842 ML20105A847
References
TXX-92384, NUDOCS 9209180014
Download: ML20105A842 (2)

Text

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., Log # TXX 923B4 f" File # 910

TUELECTRIC wun. J.cain,Jr.

August 11, 199?

om, nre husew V. S. Nucioar Regulatory Commission Attn: Mr. Lawrence A. Yandell 611 Ryan Plaza Dr., Suite 400 Arlington. TX 76011

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES) UNIT 2 DOCKET NO. 50 446 BORG WARNER / INTERNATIONAL PRODUCTS (BW/IP) CHECK VALVES

Dear Mr. Yandell:

In early July, a BW/IP check valve failed during Unit 2 preoperational testing.

TV Electric previous failures of BW/IP has check concluded that this failure was not related to the valves. An engineering report which describes the condition and its analysis is enclosed for your information.

In summary. the engineering report describes a unique set of conditions which in Combination caused the check valve failure. These ualque conditiens were an Auxiliary Feedwater System (AFW) system configuration which caused an excessive flowrote. check valve modifications (Unit 2 only),

and system effects due to a flow restricting orifice. The corrective actions to preclude recurrence include revision of the AFW operation procedures to eliminate the possibility of excessive flow-rates removal of the configuration difference (i.e., the back stop). and acoustic monitoring to determine orifice effects.

If you have questions about the engineering report, pir.ase call Roger D.

Walker at (214) 812 6866.

Sincerely.

9,Y f- )h' Wi'liam J. Cahill. Jr.

By: 89A b g/

Rogei D. Walker I (

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