ML20168A568
| ML20168A568 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 06/16/2020 |
| From: | Christopher Hunter NRC/RES/DRA/PRB |
| To: | |
| Littlejohn J (301) 415-0428 | |
| References | |
| LER 1973-001-00 | |
| Download: ML20168A568 (4) | |
Text
re of Charging Pump Valves to Open After an Ice Storm at Maine Yankee equence was:
S valve surveillance testing, the suction valve from the RWST to charging ailed to open due to ice on the valve stem, a result of an ice storm n the day.
n valve from the RWST to charging pump 14B failed to open completely, se of ice on the valve stem.
tion:
as removed from the valve stems and protective covers fabricated for the e of failed system or component:
ing pump suction valves admit water from the RWST to the charging pumps rds actuation, when pump suction flow is automatically switched from the tank to the RWST.
y of system per WASH 1400:
- High Pressure Injection System (Two of Three Pumps Required on Surry): 1.2 x 10-2 of component per WASH 1400:
- Motor O~erated Valve, failure to operate:
1 x 10 ID abilities are in units of per demand D-1 . Failure rates are in hour HR-1
Testing After to Open Due to to Fully Open Due Core an Ice Storm Icing on Valve Stem to Icing on Valve Stem Damage No - no small LOCA NSIC 48418 - Actual Occurrence for Failure of Charging Pump Valves to Open After an Ice Storm at Maine Yankee
Secondary Injection and LPR/HPI Core Heat Removal Cross-Connect Damage 1
2 3
4 5
6 7
NSIC 78418 - Sequence of Interest for Failure of Charging Pump Valves to Open
- After an Ice Storm at Maine Yankee
SSION NUMBER: 78418 ER: February 7, 1973 VENT: February 2, 1973 VOLVED: High Pressure Injection System INVOLVED: Charging pump suction valves.
Ice on valve stems OF INTEREST: small LOCA URRENCE: valve failure to open during testing ME: Maine Yankee MBER: 50-309 YPE: PWR CTRICAL RATING: 825 MWe E: .3 yr Combustion Engineering ENGINEERS: Stone and Webster Maine Yankee Atomic Power Co.
10 miles north of-Bath, Maine 360(a) hours ATING CONDITION: at 60% power TURE TYPE OF FAILURE: (a) inadequate performance; (b) failed to start; (0 made inoperable; (d) ___________
METHOD: during testing
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