ML20168A740

Final ASP Analysis - Turkey Point 3 (LER 250-74-LTR)

ML20168A740
Person / Time
Site:	Turkey Point
Issue date:	06/16/2020
From:	Christopher Hunter NRC/RES/DRA/PRB
To:
Littlejohn J (301) 415-0428
References
LER 1974-LTR
Download: ML20168A740 (4)

Text

ay 17, 1974 Malfunction of Auxciliary Feedwater Pumps at Turkey Point 3 ure sequence was:

h the reactor at power, an attempt was made to start all three auxiliary dwater pumps.

of the pumps failed to start due to overtightened packings.

third pump failed to start due to a turbine regulating valve pneumatic troller malfunction.

ve action; packing on the "A" AFW pump was loosened and later replaced. After lacement, a sticking governor linkage was also discovered.

"B" A91 pump was repacl-ed.

."C" AFW pump governor was exercised and its pneumatic controller output al was increased in value.

urpose of failed system or component:

auxiliary feedwater system provides feedwater to the steam generators reactor cooling when main feedwdter is unavailable.

bility of system per WASH 140G:* Auxiliary feedwater system: 2.5 x 1lO4 (start + 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />) bility of component per WASH 1400:* pump, failure to start: 1

• 10-3 /D navailabilitieq are in units of per demand D-1. Failure rates are in per hour HR-'.

No 1 No 2 Yes 3 Yes 4 No 5 No 6 Yes 7 rYes 8 No 9 No 10 LA Yes11 Yes 12 Yes 13 NSIC 91676 - Sequence of Interest for Malfunction of Auxiliary Feedwater Pumps at Turkey Point 3

• Use of HPI following AFW failure not included in mitigation procedures.

SSION NU~MBER: 91676 ER: May 17, 1974 VENT: May 8, 1974 VOLVED: Auxiliary feedwater INVOLVED: Auxiliary feedwater pumps vertightened packings, turbine regulating valve pneumatic controller alfunction human maintenance error OF INTEREST: Loss of feedwater CURRENCE: Failure of three auxiliary feedwater pumps to start, and run during testing.

AME: Turkey Point 3 MBER: 50-250 YPE: PWR ECTRICAL RATING: 693 MWe GE: 1.9 yr Westinghouse

-ENGINEERS: Bechtel

Florida Power & Light Co.

• Z5. miUesa.outh_: of Miami, Fla.

360(a) hours RATING CONDITION: At 98% power ATURE TYPE OF FAILURE: (a) inadequate performance; nbfailed to start; (c) made inoperable; (d) __________

METHOD: During testing The three ANW pumps which failed to start also provide auxiliary feedwater to Unit 4.