ML20249B272
| ML20249B272 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 04/14/1976 |
| From: | Dreher F, Roy G, Thompson D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| PNO-76-072-01, PNO-76-72-1, NUDOCS 9806220253 | |
| Download: ML20249B272 (1) | |
Text
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_ - - mv m w - - m u ms.cr n u.ana m.m,.xa..- -..~. w - m ra m:. w angg wg9 g ~ w v.u PRELIMINARYNOTIFICAT$0NOFEVENTORUNUShIOCCURRENCE --PHO-76-72 MN Adu mt This preliminary notification constite.ces EARLY notice of events of POSSIBLE safety or public interest significance.
The information
(_C(J presented is as initially received without verification or evaluation and is. basically all that is known by OIE staff as of 1:15 P. M. on g /"
date of this notification.
IT SHOULD BE SPECIFICALLY NOTED THAT THIS Q' AN OFFICE OF INSPECTION AND ENF
)p(.
NOTIFICATION MAY CONTAIN INFORMATION THAT LATER MAY BE DETERMINED TO l
BE INACCURATE OR INCONSISTENT.
NOTIFICATION OF AN INCIDENT OR OCCURRENCE (BLUE SHEET) SUBSEQUENTLY WILL BE ISSUED IF WARRANTED.
Facility:
Peach Bottom Units 2 & 3 (DN 50-277 and 50-278)
Philadelphia Electric Company
Subject:
DESIGN ERROR IN RHR/LPCI PUMP START CIRCUIT A review of the LPCI/RHR pump start circuitry conducted by the licensee on 4/13, revealed a circuit design error.
The second pump in each loop will not in some cases automatically start following loss of AC power and subsequent energizing of the emergency busses from the diesel generators.
The start circuitry was modified in Nov 1975 to remove the LPCI loop se-lection logic feature. Affected portions of the circuit were tested at that time, however, a complete test of total system operation was not performed.
Pc. ' Bottom Unit 2 is in a refueling outage. Unit 3 is shutdown and will m it restart until this circuitry is corrected.
GE APED, which concurred in the modification, has been apprised of the problem by IE.
The modification, based on preliminary information is not i
generic.
The above information is current as of 12:30 p.m., 4/14.
Media interest is expected because Unit 3 remains shutdown for modifi-cation and subsequent testing. Region I believes Unit 3 may return to i
power by April 15, 1976. The State of Pennys1vania has been informed of the shutdown of Unit 3.
A press release is not planned.
Region I, NRC, Philadelphia, Pa received original notification of this b{
rence by telephone from the Project Inspector on site at 9:10 a.m.,g7
Contact:
i Distribution:
Acting Chairman Rowden Commissioner Mason S. J. Chilk, SECY Commissioner Gilinsky C. C. Kammerer, CA G. F. Murphy, JCAE Commissioner Kennedy L. V. Gossick, EDO E. Volgenau, OIE J. A. Harris, PA B. C. Rusche, NRR J. La Fleur, ISP
- T. J. McTiernan, AIA K. R. Chapman, NMSS H. K. Shapar, ELD H St I b ; 'MNBB/
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PRELIMINARY NOTIFICATION - NOT FOR PUBLIC DISCLOSURE
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9906220253 760414 PDR 18 E PNO-76-072 PDR
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