ML19256C643
| ML19256C643 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 09/17/1979 |
| From: | Mckee P NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| PNO-79-423, NUDOCS 7910110623 | |
| Download: ML19256C643 (1) | |
Text
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PRELIMINMY NOTIFICATION September 17, 1979 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE -- PNO-79-423 This preliminary notification constitutes EARLY notice of an event of POSSIBLE safety or public interest sianificance.
The information presented is as initially received without verification or evaluation and is basically all that is known by lE staff as of this date FACILITY:
South Carolina Electric and Gas Company V. C. Summer Docket No. 50-395 Near Columbia, South Carolina
SUBJECT:
MAIN FEE 0 WATER RESTRAINT SYSTEM DESIGN INADEQUACY As a result of an analysis performed by the Architect / Engineer, Gilbert Associates, Incorporated (GAI), the licensee has determined that the main feedwater restraint system is inadequate to withstand certain large pressure transients.
This analysis was prompted by a Westinghouse letter of 12/13/78 which identified potential transient effects on components resulting from a postulated break of feedWater line between the check valve and the steam generator.
d The GAI analysis determined the worst case condition to be a break two feet upstream of the check valve on the pump side.
The resultant closure of all three check valves in the feedwater lines would initiate water hammer forces beyond the capability of the restraint system.
Media interest is not expected.
The licensee does not plan a news release.
The NRC does not plan to issue a news release.
The State of South Carolina has been notified.
Generic aspects are being investigated.
Region II (Atlanta) received notification of this occurrence by telephone from the resident inspector at 3:00 p.m. on September 13, 1979.
This information is current as of 4:00 p.m. on September 14, 1979.
Contact:
PMcKee, IE x28019 SEBryan, IE x28019 Distribution:
Transmitted H St Chairman Hendrie Commissioner Bradford S. J. Chilk, SECY Commissioner Kennedy Commissioner Ahearne C. C. Kammerer, CA Commissioner Gilinsky ACRS (For Distribution)
Transmitted:
MNBB P. Bldg 10'.46 V. Stello, IE L. V. Gossick, E00 H. R. Denton, NRR Region 1 H. L. Ornstein, ED0 R. C. DeYoung, NRR J. J. Fouchard, PA R. J. Mattson, NRR Landow N. M. Haller, MPA D. Vassallo, NRR J. J. Cummings, 0IA R. G. Ryan, OSP D. Eisenhut, NRR H. K. Shapar, ELD SS Bldg (MAIL)
W. J. Dircks, NMSS R. Minogue, SD S. Levine, RES PRELIMINARY NOTIFICATION 3910110 N
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