ML20168A565
| ML20168A565 | |
| Person / Time | |
|---|---|
| Site: | La Crosse File:Dairyland Power Cooperative icon.png |
| Issue date: | 06/16/2020 |
| From: | Christopher Hunter NRC/RES/DRA/PRB |
| To: | |
| Littlejohn J (301) 415-0428 | |
| References | |
| LER 1971-001-00 | |
| Download: ML20168A565 (4) | |
Text
uary 10, 1971 t Electrical Power Failure at LaCrosse equence was:
reactor shutdown, maintenance was being performed at the Genoa substation.
n resulting from that maintenance work tripped a protective differential resulted in a loss of power to the plant 69 KV tie line.
el started and assumed safety-related loads.
tion:
gency shutdown condenser and emergency core spray pump were used for restored to the 69 KV tie line 14 minutes later.
al procedures to minimize inadvertant relay actuation during maintenance d.
e of failed system or component:
power provides power to plant safety-related loads when the umit unavailable.
y of system per WASH 1400:*
,LOOP: 2 x 105 /hr.
y of component per WASH 1400:*
abilities are in units of per demand D-1 . Failure rates are in hour HLC'.
trip and loss of pump and emergency Damage off site power shutdown condenser 4W No Possible - if shutdown condenser and diesel generator is lost No NSIC 61043 - Actual Occurrence for Plant Electrical Power Failure at La Crosse
No 1 Yes 2 No 3 Yes 4 Yes 5 No 6 Yes 7 Yes 8 No 9 Yes 10 No 11 Yes 12 Yes 13 Yes 14 Yes 15 61043 - Sequence of Interset for Plant Electrical Power Failure at La Crosse Crosse utilizes shutdown condenser and condensate pumps instead of ROIC and HPCI.
N NUMBER: 61043 February 10, 1971
- January 20, 1971 ED: offsite power OLVED: relay vertent actuation during maintenance (human error)
NTEREST: loss of offsite power ENCE: loss of of fsite power during shutdown LaCrosse
- 50-409 BWR ICAL RATING: 50 MWe 3.5 yr s-Chalmers INEERS: Sargent & Lundy Dairyland Power Cooperative 9 miles S of LaCrosse, Wisc.
/A NG CONDITION: shutdown E TYPE OF FAILURE: (a)inadequate performance; (b) failed to start; G(c made inoperable; (d)____________
HOD: operational event
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