ML20168A436

Final ASP Analysis - Browns Ferry 1 (LER 259-73-LTR-2)

ML20168A436
Person / Time
Site:	Browns Ferry
Issue date:	06/16/2020
From:	Christopher Hunter NRC/RES/DRA/PRB
To:
Littlejohn J (301) 415-0428
References
LER 1973-002-00
Download: ML20168A436 (4)

Text

RCIC and HPCI Failure During Testing at Browns Ferry 1 ure sequence was:

iig startup testing the RCIC system failed to operate when manually t'ated. The steam supply valve faL.ed to open, I.was then manually initiated to maintain vessel water level.

ever, it isolated and tripped.

operator reset the isolation circuit and reinitiated HPCI which rated successfully.

ve action:

RCIC steam supply valve was repaired.

ause for the HPCI trip could be found.

urpose of failed system or component:

provides a source of water should the reactor become isolated.

provides a high pressure coolant supply during a small LOCA.

bility of system per WASH 1400:

• RCIC 8.0 x 10-2 /D HPic 8.8 x 10 2 /1) bility of component per WASH 1400:

availabilities are in units of per demand D-1 . Failure rates are in per hour HRR'.

___________________________________________________________ Failure to Start Damage No No Yes No C 85738 - Actual Occurrence of RCIC and HPCI Failure During Testing at Browns Ferry 1

No I Yes 2 No yes Yes 5 Yes 6 Yes 7 SIC 85738 - Sequence of Interest for RCIC and HPCI Failures During Testing at Browns Ferry 1

'An apparent loss of feedwater.

2PIwas manually reset and operated satisfactorily.

NUMBER: 85738 November 19, 1973 D: RCIC/HPCI LVED: Steenm supply valve, Isolation circuits ical Failure TEREST: Loss of Feedwater CE: HPCI and RCIC Failures during testing.

Browns Ferry 1 259 BWR CAL RATING: 1065 MWe'

.18 yr ral Electric EERS: TVA A

miles NW of Decatur, AL CONDITION: Start up testing TYPE OF FAILURE: (a) inadequate performance; 6failed to start; (c) made inoperable; (d) -

D: Operational Event while startup testing.

R