ML20054N082

Final Deficiency Rept Re Excessive Stress on Spray Pond Supply & Bypass Headers,Initially Reported on 820218. Piping Layout Revised & Drawings Revised/Reissued.Seismic Analysis Complete & Isometrics Issued

ML20054N082
Person / Time
Site:	Hartsville
Issue date:	07/01/1982
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, NCR-HTAHPP8202, NUDOCS 8207150332
Download: ML20054N082 (2)

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• h TENNESSEE VALLEY AUTHORITY - .j'c;4 CH ATTANOOGA, TENNESSEE-374ol ' . fj 400 Chestnut Street Tower II g7 '<, , r;j'* -

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July 1, 1982 8,,

k HTRD-50-518/82-11, -520/82-11 U.S. Nuclear Regulatory Commission Region II ATTN: James P. O'Reilly, Regional Administrator 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303

Dear Mr. O'Reilly:

HARTSVILLE NUCLEAR PLANT A - REPORTABLE DEFICIENCY - EXCESSIVE STRESS ON SPRAY POND SUPPLY AND BYPASS HEADERS - HTRD-50-518/82-11, -520/82-11 The subject deficiency was initially reported to NRC-0IE, Region II, Inspector Ross Butcher on February 18, 1982 as NCR HTAHPP8202. Our first interim report was submitted to your office on March 29, 1982. In accordance with paragraph 50.55(e) of 10 CFR Part 50, we are enclosing-the final report on the subject deficiency. If you have any questions, please call Jim Domer at FTS 858-2725.

Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, nager Nuclear Licensing Enclosure cc: Mr. R. C. DeYoung, Director (Enclosure)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 S

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An Equal Opportunity Employer i

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. s HTRD050-518/82-11, -520/82-11 ENCLOSURE HARTSVILLE NUCLEAR PLANT A EXCESSIVE STRESS ON SPRAY POND SUPPLY AND BYPASS HEADERS 10 CFR 50.55(e) REPORT NO. 2 (FINAL)

NCR HTAHPP8202

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Description of Deficiency The spray pond supply and bypass header drawings were issued before the seismic analysis was completed.

Because of the long leadtime required to purchase the material for this system and to provide the field with drawings they could use for planning, scheduling, and fabrication purposes, drawings were released before the seismic analysis was completed. TVA realized some changes might be required. The drawings were squadchecked before issue to all affected parties, comments were resolved, and the drawings signed out and issued.

It is common practice to issue piping drawings before the seismic analysis is completed. The designer, using his experience and judgement, provides flexibility in the layout. The seismic analysts were consulted on a regular basis during the initial layout and based on their experience felt there would be no problem qualifying the piping arrangement.

When the analysis was made, it was discovered that the piping system would be overstressed in the valve pits. To reduce the stress, additional modifications were required to the original design of the piping system.

This condition was identified during a routine review of design input information.

Safety Implication The Essential Service Water System, of which the spray pond supply and bypass headers are a part, is a safety-related system and its integrity must be maintained to provide shutdown capability under all postulated conditions. If this condition had gone uncorrected, the piping system i

could have failed and as this condition existed for both trains, the I

shutdown capability of the reactor could have been impaired.

Corrective Action The piping layout has been revised and the drawings were revised per ECN-586 and reissued. The seismic analysis is complete, and the j isometrics have been issued. Since no piping has been installed, all

{ installations will be done to the corrected design.

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