ML20168A552
| ML20168A552 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 06/16/2020 |
| From: | Christopher Hunter NRC/RES/DRA/PRB |
| To: | |
| Littlejohn J (301) 415-0428 | |
| References | |
| LER 1974-LTR-00 | |
| Download: ML20168A552 (4) | |
Text
PRECURSOR DESCRIPTION AND DATA NSIC Accession Number:
93553 Date:
December 8, 1974
Title:
Diesel Generator Malfunctions at Hatch 1 The failure sequence was:
- 1. The diesel generators were undergoing surveillance testing.
- 2. Diesel generator 1A failed to start.
- 3. Diesel generator lB started but shut down after about a minute of operation.
- 4. An investigation revealed that the air side of the governor booster had rusted on both diesels.
Also the day tank for diesel 1G contained 50 gallons of water.
Corrective action:
The air port to the booster was cleaned and its diameter increased from 0.025 to 0.050 inches on all three diesels.
Design purpose of failed system or component:
The diesels provide a.c. power to the plant when offsite sources are unavailable.
The governor booster supplies oil to the governor.
Unavailability of system per WASH 1400: *Emergency Power:
10-2 /D Unavailability of component per W4ASII 1400: *Diesel failure to start:
3 x 10-2 /D Diesel Engine failure to run:
3 x 10-4 /hr Unavailabilities are in units of per demand D-1.
Failure rates are in units of per hour 11871.
Diesel Generator Operability Diesel Generator 1A Failed To Start Test tJas' Underway Due to Rusty Governor Booster Diesel Generator lB StarteA But Potential Fails to Run More Than 1 Minute Severe Due to a Rusty Governor Booster Core and Water in the Day Tank IDamage No, no loop No, no loop No, no loop No NSIC 93553 -
Actual Occurrence of Two Diesels Fail at Hatch I
Loss of Reactor Diesel Reactor Made Sub-RCIC/HPCI ADS/LPCI Long Powier Sca Loartad SBcSrica Rod Are Initiae CS Tes Crm Powfier Sra Soartad ScSrtia Roy the Initiates CSoTrd Manually Driven In Cooling Potential Severe Core Damage Sequence No.
No Yes No Yes Yes No Yes Yes No Yes No Yes Yes Yes Yes 1
2 3
4 5
6 7
8 9
10 11 12 13 14 15 NSIC 93553 -
Sequence of Interest of Two Diesel Generators Fail at Hatch 1
CATEGORIZATION OF ACCIDENT SEQUENCE PRECURSORS NSIC ACCESSION NUMBER:
93553 DATE OF LER:
January 16, 1975 DATE OF EVENT:
December 8, 1974 SYSTEM INVOLVED:
Electric Power COMPONENT INVOLVED:
Diesel Generators CAUSE:
Mechanical failure of the governor boosters, water in the day tank SEQUENCE OF INTEREST: Loss of offsite power ACTUAL OCCURRENCE:
Two diesel generators malfunction at Hatch 1 REACTOR NAME:
Hatch 1 DOCKET NUMBER:
50-321 REACTOR TYPE:
BWR DESIGN ELECTRICAL RATING:
786 MWe REACTOR AGE:
yr VENDOR: General Electric ARCHITECT-ENGINEERS:
OPERATORS: Georgia Power LOCATION:
11 miles' North of Baxley, GA DURATION:
360(a) hours PLANT OPERATING CONDITION:
not known SAFETY FEATURE TYPE OF FAILURE:
(a) inadequate perfor mce;~
failed to start; (c) made inoperable; (n(,d~)efaie to run DISCOVERY METHOD: Testing COMMENT:
Diesel 1A had failed on December 7.