ML20168A449
| ML20168A449 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 06/16/2020 |
| From: | Christopher Hunter NRC/RES/DRA/PRB |
| To: | |
| Littlejohn J (301) 415-0428 | |
| References | |
| LER 1979-059-00 | |
| Download: ML20168A449 (4) | |
Text
B-640 PRECURSOR DESCRIPTION AND DATA NSIC Accession Number:
150882 Date:
June 6, 1979
Title:
Both Diesel Generators Trip During Testing at Crystal River 3 The failure sequence was:
- 1. During performance of Engineered Safeguards Time Response Test, both diesel generators tripped when loaded on the emergency buses due to am imbalance in reactive load.
Corrective action:
- 1. A procedure revision was implemented to eliminate the high MVAR and reduce thkc reactive load imbalance.
- 2. The diesel generators were surveilled daily from June 9 -
June 15 and per-formed satisfactorily.
Design purpose of failed system or component:
- 1. The emergency diesel-generators provide power to safety-related equipment in the event of loss of offsite power.
Unavailability of system per WASH 1400: *emergency power systems:
1 x 10-2 /D Unavailability of component per WASH 1400:
- each diesel generator:ý 3 x 10- 2/D Unavailabilities are in units of per demand D.
Failure rates are in units of per hour HR'1.
Reactor in Refueling Diesel Generator A Diesel Generator B Shutdown and Engineered Started and Loaded Started and Loaded Safeguards Time Response Successfully Successfully Test in Progress Potential Severe Core Damage
.No w
No -
of fsite power available NSIC 150882 -
Actual Occurrence for Failure of Both Diesel Generators During Testing at Crystal River 3
Loss of Turbine Emer-Auxiliary PORV PORV or High Long Offslte Generator gency Feedwater and Demanded PORV Isola-Pressure Term Power Runs Back Power Secondary
.tion Valve Injection Core and Assumes Heat Removal Closure Cooling House Loads Potential Severe Core Damage No Sequence No.
2 3
4 5
6 7
8 9
10 11 12 13 0%
4-3 NSIC 150882 -
Sequence of Interest for Failure of Both Diesel Generators During Testing at Crystal River 3
B-643 CATEGORIZATION OF ACCIDENT SEQUENCE PRECURSORS NSIC ACCESSION NUMBER:
150882 DATE OF LER:
June 27, 1979 DATE OF EVENT:
June 6, 1979 SYSTEM INVOLVED:
Emergency Electric Power COMPONENT INVOLVED:
2 Diesel Generators CAUSE:
Imbalance in reactive load, both DGs tripped, (human error)
SEQUENCE OF INTEREST:
Loss of off-site power ACTUAL OCCURRENCE:
Both DGs tripped during test REACTOR NAME:
Crystal River 3 DOCKET NUMBER:
50-302 REACTOR TYPE:
PWR DESIGN ELECTRICAL RATING:
825 MWe REACTOR AGE:
2.4 yr VENDOR:
B&W ARCHITECT-ENGINEERS:
Gilbert Associates OPERATORS:
Florida Power Corp.
LOCATION:
7 miles NW of-Crystal River, Fla.
DURATION:
360(a) hours PLANT OPERATING CONDITION:
0% power SAFETY FEATURE TYPE OF FAILURE: E~inadequate performance; (b) failed to start; (c) made inoperable; (d)____________
DISCOVERY METHOD:
Testing COMMENT:
-