ML20168A591
| ML20168A591 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 06/16/2020 |
| From: | Christopher Hunter NRC/RES/DRA/PRB |
| To: | |
| Littlejohn J (301) 415-0428 | |
| References | |
| LER 1977-047-00 | |
| Download: ML20168A591 (4) | |
Text
eptember 24, 1977 A Complete Loss of Offsite Power Occurs at Palisades lure sequence was:
the reactor at 100% power during an electrical storm, the switchyard bus de-energized and caused a complete loss of offsite power and loss ain condenser cooling.
turbine tripped on high condenser vacuum, and effected reactor and rator trips.
diesel generators started and supplied electric-power to safety-related s.
ive action; purpose of failed system or component:
f-site power provides the preferred source of electric power to plant nt when the unit generator is not in operation. The condenser circulating umps are normally powered from the of fsite power source.
ability of system per WASH 1400?: loss of offsite power: 2 x 10-5 /hr ability of component per WASH 1400: -
1 navailabilities are in units of per demand D- . Failure rates are in f per hour 11R'1.
tor trip (LER does not specify which pump was used)
No Yes No
- Yes No SIC 130119 - Actual occurrence fdr a Complete Loss of Offsite Power at Paligades
No No 2 No 3
'Yes 4 Yes 5 No 6 No 7 Yes 8 Yes 9 No 10 I
Yes 11 12 Xes 13 130119 - Sequence of Interest for a Complete Loss of Offsite Power at Palisades included in mitigation procedures.
SION NUMB3ER: 130119 R: October 18, 1977 ENT: September 24, 1977 VOLVED: offsite power NVOLVED: switchyard "R" bus s trip from unknown causes F INTEREST: loss of off site power RRENCE: reactor trip due t o loss of offsite power NE: Palisades BER: 50-255 PE: PWR CTRICAL RATING: 805 MWe E: 6.5 yr Combusfton Engineering NGINLEERS: Bechtel Consumers Power Co.
5 miles south of South Haven, Mich.
N/A ATING CONDITION: 100%4 power TURE TYPE OF FAILURE: (a) inadequate performance; (b) failed to start;
. 0made inoperable; (d) _________
MIET1EOD: during operation
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