ML19332A049
| ML19332A049 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 09/04/1980 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NCR-2446, NUDOCS 8009100459 | |
| Download: ML19332A049 (2) | |
Text
400 Chestnut Street Tower II September 4, 1980 Mr. James P O'Reilly, Director Office of Ins ction and Enforcement U.S.
- uclear Re, latory Commission Recion II - Suitt '100 101 !!arietta Stree Atlanta, Georgia 3 3
Dese Mr. O'Reilly:
SECUOYAH NUCLEAR PLANT UNIT 2 - DEFICIENCIES IN INSTALLED PIPE HANGERS AND DISCHARGE PIPING IN TEE ERC'i PUMPING STATION - NCR 2246 AND iiCR 2259
- FI:AL REPORT
~~
rho cubject deficie.ncy was initially reported to NRC-0IE Inspector C. R. !!cFarland on August 5,1980, in accordance with 10 CFR 50.55(e).
Encle:ed is our final report.
If ycu have any questions, please get in touch with D. L. Lambert at FTS 357-2581.
Very truly yours, TEENESSEE VALLEY AUTHO.4ITY L. M. Milla, Mcnacer Nuclear Regulation and Sefety Ealocure cc:
Mr. Victer-Stello, Director (Enclosure)
Office of Inspection and Enforcement
' U.S. t.uclear Regulatory Ccemission Eachington, DC 20555 (26/7
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.t sr ENCLOSURE SEQUOYAH NUCLEAR PLANT UNIT 2 DEFICIENCIES IN INSTALLED PIPE HANGERS AND DISCHARGE PIPING IN THE ERCW PUMPING STATION NCR 2246 AND NCR 2259 10 CFR 50.55(e)
FINAL REPORT Description of Deficiencies NCR 2246 and NCR 2259 both deal with deficiencies associated with t'he installation of safety-related pipe hangers at the ERCW pumping station.
In addition, NCR'2246 includes deficiencies associated with the installation of the discharge piping for ERCW pumps NB and PB at the ERCW pumping station.
The cause of the deficiencies associated with the installation of pipe hangers is the result of minor errors in TVA Division of Engineering Design (EN DES) issued drawings and craft personnel failing to comply with issued EN DES drawings.
The cause of the deficiencies associated with the location of the discharge piping is the result of embedded pipes which interface with the discharge piping extending past their location requirements.
Safety Icplications Had this condition gone uncorrected, possible failure of the pipe hangers may have occurred during a seismic event caused by bolt failure, rotation of the supports and plates by 90 degrees, and the likelihood of concrete failure because of inadequate bolt spacing.
There is r.o safety implication identified with the discharge piping.
Corrective Action An analysis has been performed to justify the "as-installed" condition of all pipe hangers. Those hangers which were determined to be unacceptable were reworked to satisfy the analysis requirements ensuring that there is no safety or seismic problem.
A review was performet by design employees who. determined that the location of the discharge pipir g would not alter the original analysis and, the piping is therefore acceptable in the "as-installed" configuration.
Design drawings have be ?n revised to reflect the "as-installed" configuration.
EN DES employees have been instructed to do a more thorough job of checking drawings before their issuance, while craft employees have been instructed to adhere to issued design drawings during installation of pipe hangers.
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