ML20168A593
| ML20168A593 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 06/16/2020 |
| From: | Christopher Hunter NRC/RES/DRA/PRB |
| To: | |
| Littlejohn J (301) 415-0428 | |
| References | |
| LER 1977-055-00 | |
| Download: ML20168A593 (4) | |
Text
ember 16, 1977 mplete Loss of Offsite Power Occurs at Palisades sequence was:
mormal operatiom with the reactor at 85% power, switchyard- bus "R" de-energized, causing a complete loss of offsi~te power and resulting ss of maim condenser cooling water flow.
ctor was manually tripped.
esel generators started and provided power to safety-related loads.
action;.
he cause of the "R" bus loss was under investigation.
pose of failed system or component:
power provides the preferred source of electric power to plant equip-he unit generator is not in operation. The condenser circulating are normally powered from the off-site source.
5 lity of system per WASH 140G:* loss of of fsite power: 2 x 10- /hr lity of component per WASH 1400: -
1 ailabilities1 are in units of per demand D- . Failure rates are in per hour HR- .
of offsite power safety-related generators for reactor and loss of con- loads cooling (LER does not denser cooling specify which pump was used)
C 132943 - Actual Occurrence for Complete Loss of Offsite Power at Pali6ades
and Assumes Heat Removal Closure Cooling Damage House Loads 2
3 4
5 6-7 8
9 10 11 12 13 NSIC 132943-- Sequence of Interest for Complete Loss of Offsite Power at Palisades
- Not included in mitigation procedures.
SION NUMBER: .132943 R: December 16, 1977 NT.: November 25, 1977 OLVED: offsite power NVOLVED: switchyard bus "R" us trip from unknown causes F INTEREST: reactor trip with loss of offsite power URRENCE: reactor trip with loss of offsite power IE: Palisades 1BER: 50-255 PE: PWR CTRICAL RATING: 805 MWe E: 6.8 yr Combustion Engineering ENGINEERS: Bechtel Consumers Power Cb; 5 mil-es south of goutL Hav~en, Mich.
N/A ATING CONDITION: 85% power TURE TYPE OF FAILURE: Ca) inadequate performance; (b) failed to start;
((in)ade inoperable; (d) ________
METEOD: during operation
_. See also 132958