ML20168A444

Final ASP Analysis - Brunswick 2 (LER 325-79-089)

ML20168A444
Person / Time
Site:	Brunswick
Issue date:	06/16/2020
From:	Christopher Hunter NRC/RES/DRA/PRB
To:
Littlejohn J (301) 415-0428
References
LER 1979-089-00
Download: ML20168A444 (4)

Text

ovember 20, 1979 ROIC Turbine Trips with HPCI Unavailable at Brunswick 2 re sequence was:

tor trip occurred. (reason unspecified) was unavailable due to maintonance.

initiated on low-low reactor water level (-38 inches).

RCIC turbine tripped on overspeed.

was reset and manually set into operation. The reactor water level had hed -40 inches.

e action:

investigation revealed a crack in the amphenal connector to the tachometer ausing a loose connection. This connector was replaced and the turbine ith satisfactory results.

urpose of failed system or component:

RCIC provides reactor core cooling and water level control during a loss of water flow.

tachometer monitors the turbine speed for control purposes.

ility of system per WASH 1400:

• RCIC: 8 x 10-2/D ility of component per WASH 1400:*-

vailabilities are in units of per demand D-1 . Failure rates are in per hour HR-1

Damage No No - ADS/CS/LPCI available ahould both HPCI and RCIC fail No No I_______________________________

No - ADS/CS/LPCI available should both HPCI and RCIC fail ATWS C 153810 - Actual Occurrence of RCIC Turbine Trip with H-PCI Unavailable at Brunswick 1

No Yes 2 No 3 Yes4 Yes 5 Yes Yes 7 NSIC 153810 - Sequence of Interest for RCIC Turbine Trip with ff201 Unavailable at Brunswick 1

'Success requires the operator to reset and manually start RCIC.

ION NUMBER: 153810

December 17, 1979 NT: November 20, 1979 LVED: RCIC INVOLVED: Tachometer chanical failure INTEREST: Loss of feedwater flow RRENCE: RCIC turbine trip with HPCI unavailable ME: Brunswick 1 BER: 50-325 PE: BWR TRICAL RATING: 821 MWe

3.11 yr E

NGINEERS: United Engineers and Constructors Carolina Power and Light Co.

Three miles N of Southport, NC N/A TING CONDITION: Scrammed URE TYPE OF FAILURE: (a) inadequate performance; (b) failed to start;

~made inoperable; (d) ___________

ETHOD: operator surveillance