ML20168A567
| ML20168A567 | |
| Person / Time | |
|---|---|
| Site: | University of Utah |
| Issue date: | 06/16/2020 |
| From: | Christopher Hunter NRC/RES/DRA/PRB |
| To: | |
| Littlejohn J (301) 415-0428 | |
| References | |
| LER 1972-014-00 | |
| Download: ML20168A567 (4) | |
Text
gust 17, 1972 oss of Load and Iodine Release at La Crosse re sequence was:
f the two paralleled 69/161 kv transformers in the switch yard ent to the plant was taken out of service to repair an oil leak.
completion of the repairs oil was being added to the transformer rate which caused operation of the "sudden pressure relay". This had not been disabled prior to repair as specified in the proceedures.
elay protecting the turbine generator also tripped for unknown reasons.
loads were transferred from the unit auxillary to the reserve trans-r resulting in a complete loss of generator load.
iesel generator started and assumed safety related loads.
e actiun:
enance personnel were instructed on the function of the "Sudden ure" relay function and details were incorporated into the transformer enance proceedures to prevent inadvertant operations of protective es.
pose of failed system or component:
te power provides power to house loads when the generator is down.
lity of system per WASH 1400: LOOP: 2 x lO-5 /hr lity of component per WASH 1400: -
ailabilities are in units of per demand D-1 . Failure rates are in er hour HR-1
IInALOOP_______________________
No No, offsite power was restored within 20 minutes, IC 'is sufficient No No Actual Occurrence of Loss of Load and Iodine Release at LaCrosse
Yes2 No 3 Yes 4 Yes 5 NG 6 Yes 7 Yes 8 No 9 Yes 100 No 11 Yes 12 Yes 13 Yes 14 Yu+/-s 15
- Sequence of Interest for Loss of Load and Iodine Release at LaCrosse
NUMf3ER: 75074 September 13, 1972 August 17, 1972 D: Offsite power LVED: Relays r Error TEREST: Loss of Offsite Power NCE: Loss of Load and Iodine Release La Crosse 407 BWR CAL RATING: 50 MWe 5.1 yr Chalmers NEERS: Sargent and Lundy airyland Power Corporation miles S of La Crosse.
G CONDITION: Just scrammed from power TYPE OF FAILURE: (a) inadequate perfo ce; (b) failed to start; (c) made inoperableo; 0,d init-intng Pvpnt OD: Operational Event