ML20168A571

Final ASP Analysis - Millstone 1 (LER 245-76-012)

ML20168A571
Person / Time
Site:	Millstone
Issue date:	06/16/2020
From:	Christopher Hunter NRC/RES/DRA/PRB
To:
Littlejohn J (301) 415-0428
References
LER 1976-012-00
Download: ML20168A571 (4)

Text

March 15, 19Ah Gas Turbine Fails to-Achieve Rated Speed at Millstone 1 lure sequence was:

gas turbine was being tested daily since the isolation condensor (IC) inoperable. The feedwater coolant injection system, which is redundant the IC, requires that the gas turbine be operable given a loss of site power.

ing the surveillance test the gas turbine initiated that failed to ch rated speed. Electronic components in the governor were functioning.

unit was placed in cold shutdown.

ive action:

defective electronic components were replaced.

purpose of failed system or component:

IC is a natural circulation heat sink used when the reactor is lated.

feedwater coolant injection systen provides a high pressure source ater given a snall LOCA.

bility of system per WASH 1400: *IC: N.A.

FWCI: N.A.

bility of component per WASH 1400: Gas Turbine: N.A.

Electronic components (solid state devices, low power application):

3.1lOJHR navailabilities are In units of per demand D-1 . Failure rates are in f per hour 11R1 .

To IC Inoperability Core Damage No, no LOOP No NSIC 112310 -Actual Occurrence of Gas Turbine Fails to Achieve Rated Speed at Millstone 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 Sequence of Interest for Gas Turbine Fails to Achieve Rated Speed at Millstone 1

ION NUNDER: 112310

March 29, 1976 NT: March 15, 1976 LVED: I.C., FWCI, Emergency Power.

NVOLVED: Gas turbine lure of an electronic component INTEREST: Loss of offsite power.

R~RENCE. Gas Turbine Fails to Achieve Rated Speed.

E: Millstone - I ER: 245 E: BW TRICAL RATING: 660 MWe

54 yr eneral Electric NGINEERS: Ebasco.

Northeaistern Nuclear Energy Company Five miles SW of New London 12 (a) hours TING CONDITION: At Power.

URE TYPE OF FAILURE: (a)inadequate performance; (b) failed to start; 01 made inoperable; (d) ____________

ETHOD: Surveillence testing.