ML20168A570

Final ASP Analysis - Millstone 1 (LER 245-76-010)

ML20168A570
Person / Time
Site:	Millstone
Issue date:	06/16/2020
From:	Christopher Hunter NRC/RES/DRA/PRB
To:
Littlejohn J (301) 415-0428
References
LER 1976-010-00
Download: ML20168A570 (4)

Text

March 8, 1976-

Gas Turbine Becomes Inoperable at Millstone ailure sequence was:

he isolation condemsor was inoperable.

t was decided to start the emergency power system (a gas turbine and a iesel generatorlT as a precaution as hurricane Belle passed.

he gas turbine failed to run because the governor was out of adjustment.

he reactor was placed in cold shutdown since both the IC and the FWCI ystems were inoperable.

ctive action:

he governor was adjusted.

n purpose of failed system or component:

he I.C. is a natural circulation system which serves as a heat sink en the reactor is isolated.

he FWCI system provides for a source of high pressure coolant given Loca.

Unavilailiy ofsysem er WSH 400 lability of systoentper WASH 1400:

• Unavailabilities are In units of per demand D-1. Failure rates are' in of per hour HR-1 .

To Run Cold Shutdown Severe as Turbine For Precaution Core s Hurricane Bell Passed Danage No No, violation of Tech Specs No IC .112309 - Actual Occurrence of Gas Turbine Becones Inoperable at Millstone 1

No 1 Yes 2 No 3 Yes 4 Yes 5 No 6 Yes 7 Yes 8 No 9 Yes 10 No 11 Yes 12 Yes 13 Yes 14 Yes 15 2309 - Sequence~of Interest of Gas Turbine Becomes Inoperable at Millstone 1

CATEGORIZATION OF ACCIDENT SEQUENCE PRECURSORS ION NUMBER: .112309

March 22, 1976 NT: March 8, 1976 LVED: I.C., FWCI, Emergency Power NVOLVED: Governor t of adjustment INTEREST: Loss of offsite power.

RRENCE: Gas Turbine Becomes Inoperable E: Millstone 1 ER: 245 E: BWR TRICAL RATING: 660 Wie

54 yr eneral Electric ENGINEERS: Ebasco North East Nuclear Energy Company Five miles SW of New London 12 (a) hours TING CONDITION: 100% power URE TYPE OF FAILURE: (a) inadequate performance; (b) failed to start;

-D de inoperable; (d) ___________

ETHIOD: Operational Event.