ML20168A724
| ML20168A724 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 06/16/2020 |
| From: | Christopher Hunter NRC/RES/DRA/PRB |
| To: | |
| Littlejohn J (301) 415-0428 | |
| References | |
| LER 1978-016-00 | |
| Download: ML20168A724 (4) | |
Text
h Diesel Generators Inoperable Simultaneously at Rancho Seco sequence was:
ne diesel generator was out of service for maintenance, the second generator was started and paralleled with the nuclear-service bus, ired.
he diesel was running, fuel oil began to spray from a loose packing, ould not be tightened while the diesel was in operation.
ond diesel was shut down for repair.
action; ning diesel was shut down to repair the packing gland. The reactor t down as required. The packing gland was repaired, the diesel or restarted, and the p~ant returned to power.
ose of failed system or component:
led component provides removal of foreign matter from diesel generator l.
ity of system per WASH 1400:
- emergency power: 10-2 /D ity of component per WASH 1400:* individual diesel generator:
3 x 10-2 /D 1
ilabilities are in units of per demand D- . Failure rates are in 1
hour HR- .
diesel generator A running No No - Offsite Power Available NSIC 141455 - Actual Sequence for Both Diesel Generators Inoperable Simultaneously at Rancho Seco
2 3
4 5
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10 11 12 13 141455 - Sequence of Interest for Both Diesel Generators Inoperable Simultaneously at Rancho Seco included in mitigation procedures.
CESSION NUMBER: 141455 LER: October 17, 1978 EVENT: October 4, 1978 NVOLVED: Emergency electric power T INVOLVED: Packing gland - diesel generators Loose packing gland on fuel oil strainer.
OF INTEREST: Loss of of fsite power.
CCURRENCE: 1 DG out of service - loose gland resulted in oil spray of fuel oil from second NAME: Rancho Seco UMBER: 50-312 TYPE: PWR LECTRICAL RATING: 918 MWe ACE: 4.2 yr B&W T-ENGINEERS: Bechtel S: Sacramento Municipal Utility District
- 25 milefi SE of Sacramento. Ca..
.9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br /> ERATING CONDITION: 100% power.
EATURE TYPE OF FAILURE: (P inadequate performance; (b) failed to start; (c) made inoperable; (d)_________
Y METHOD: Operational event 1 DG was being serviced. Loose packing gland on fuel oil strainer caused fuel oil to spray out. Location of strainer prevented tightening gland with diesel running. DG was shut down to tighten gland.