ML20168A576

Final ASP Analysis - Millstone 2 (LER 336-77-020)

ML20168A576
Person / Time
Site:	Millstone
Issue date:	06/16/2020
From:	Christopher Hunter NRC/RES/DRA/PRB
To:
Littlejohn J (301) 415-0428
References
LER 1977-020-00
Download: ML20168A576 (4)

Text

ust 10, 1977 oth Diesel Generator Fuel Supply Valves Found Shu~t at Millstone 2 e sequence was:

a routine inspection with the plant in cold shutdown, the-fuel supply on both diesel generators were found shut. The cause of valve e was not known.

fuel supply valves were reopened.

e action; lve manual operators were chain locked in the open position.

rpose of failed system or component:

iesel generators provide on-site emergency power for safety-related the event of fsite power and the-~unit generator are unavailable.

ility of system per W4ASH 140U;

• emergency power: 3 x 10-2 /1) ility of component per WASH 1400:* diesel generators: 10-2 /D availabilities are in units of per demand D-1 . Failure rates are in 1

per hour HR- .

nd plant fuel supply valve fuel supply valve Severe ion in found shut in found shut in Core s violation of violation of Damage procedures procedures No - unit in cold shutdown plus of fsite power available

[NO SIC 132979 - Actual Occurrence for Both Diesel Generator Fuel Supply Valves Found Shut at Millstone 2

No 2

3 4

5 6

7 8

9 10 11 12 13 132979 - Sequence of Interest for Both Diesel-Generator Fuel Supply Valves Found Shut at Millstone 2 included in mitigation procedures.

ESSION NUIMER: 132979-LER: August 10,- 1.977 (Original report date June 14, 1977)

EVENT: May 15, 1977 NVOLVED:. on-site emergency .power T INVOLVED: diesel-generators fuel supply valves shut, human error OF INTEREST: loss of of fsite power CCURRENCE: fuel supply valves discovered to be. shut during an inspection-NA11E: Millstone 2 UMBER: 50-336 TYPE: PWR LECTRICAL RATING: 870 MWe AGE: 2.0 yr

.Combustion Engineering T-ENGINEERS: Bechtel S: Northeast Nuclear Energy Co.

5 allea SI'tof New London, Comm.

180(a) hours ERATING CONDITION: cold shutdown EATURE TYPE OF FAILURE: (a) inadequate performnance; (ba)failed to start; (Omade inoperable; (d) __________

Y METHOD: routine inspection

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