ML19276F630

Second Interim Rept Re Possible Excessive Water Hammer Forces on Main Feedwater Check Valves.Analysis in Progress. Expects to Submit Complete Rept by 790521

ML19276F630
Person / Time
Site:	Sequoyah
Issue date:	03/13/1979
From:	Gilleland J TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NUDOCS 7904060275
Download: ML19276F630 (1)

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TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 374ot 500C Chestnut Street Tower 11 '"'NWLA March 13, Q7M 15 A 8

• M Mr. James P. O'Reilly, Director Office of Inspection and Enforcement  :

.,,OU U.S. Nuclear Regulatory Co==ission p a Region II - Suite 3100 101 Marietta Street Atlanta, Georgia 30303

Dear Mr. O'Reilly:

SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 - POSSIBLE EXCESSIVE WATER HAMMER FORCES ON MAIN FEEDWATER CHECK VALVES - NCR MEB 79 SECOND INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector C. R. McFarland on January 15, 1979. An interim report was submitted on February 14, 1979.

An analysis of the main feedwater check valves' ability to absorb forces imposed by feedwater hammer following a postulated feedwater line break in one leg of the main feedwater system is in progress. TVA has found that some incorrect data may have been entered into the computer program used to determine the energy i= parted to the main feedwater check valves.

Our analysis is continuing, and we expect to submit a complete report by May 21, 1979.

If you have any questions concerning this matter, please get in touch with M. R. Wisenburg at FTS 854-2581.

Very truly yours,

<

. E. Gilleland Assistant Manager of Power cc: Mr. John G. Davis, Acting Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 0

7904060216 ,

790 /5.L OFFICIAL COPfl An Equal Opportunity Employer