05000259/LER-1981-047-03, /03L-0:on 810822,RHR Svc Water (Rhrswp) Pump Room Flooded Due to Failure of RHRSW Pump A2 Air Vacuum Valve 23- 505 to Seal,Rendering Rhrsw/Eecw Pumps A1,A2 & A3 Inoperable Which Resulted in Inoperability of RHR a Heat Exchan

/03L-0:on 810822,RHR Svc Water (Rhrswp) Pump Room Flooded Due to Failure of RHRSW Pump A2 Air Vacuum Valve 23- 505 to Seal,Rendering Rhrsw/Eecw Pumps A1,A2 & A3 Inoperable Which Resulted in Inoperability of RHR a Heat Exchangers

ML20010H483
Person / Time
Site:	Browns Ferry
Issue date:	09/18/1981
From:	Holder G TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010H474	List: 05000259/LER-1981-047, Forwards LER 81-047/03L-0 05000259/LER-1981-047-03, /03L-0:on 810822,RHR Svc Water (Rhrswp) Pump Room Flooded Due to Failure of RHRSW Pump A2 Air Vacuum Valve 23- 505 to Seal,Rendering Rhrsw/Eecw Pumps A1,A2 & A3 Inoperable Which Resulted in Inoperability of RHR a Heat Exchan
References
LER-81-047-03L-01, LER-81-47-3L-1, NUDOCS 8109240523
Download: ML20010H483 (2)

LER-1981-047, /03L-0:on 810822,RHR Svc Water (Rhrswp) Pump Room Flooded Due to Failure of RHRSW Pump A2 Air Vacuum Valve 23- 505 to Seal,Rendering Rhrsw/Eecw Pumps A1,A2 & A3 Inoperable Which Resulted in Inoperability of RHR a Heat Exchangers

Event date:
Report date:
2591981047R03 - NRC Website

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NRC F OftM 364 U. S. NUCLE AR REGUL ATOXY COMMISSION

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8 60 61 DOCKET NUMBER 68 69 EVENT D ATE 74 iS R E POR T D AT E 80 EVENT OESCRIPTION AND PROBABLE CONSEQUFNCES h ) f ailed to seal, the "A" RllRSW pump room l A2 Ri!RSW pump air vacuum valve (23-505 l

o 2 The water rendered A1, A2, A3 RHRSW/EECW pumps inoperable. This in g g ; was flooded.

turn made the "A" RHR heat exchangers on units 2 and 3 inoperable.

(T. S. 3. 5.C. 2,

o,, y l 3.5.B.5, and 3.5.B.12) RHRSW/EECW system is common to all units. There was no danger to the health or safety of the public and no previous similar events. Redundant gl io j,j [ systems were Available and operable.

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7 l SI's were performed. Model 52 valves C1 (23 -545) and B3 (67-590) grefound gil3ll broken and were replaced. In future, float guides will be inspected every l

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Browns Ferry Nuclea* Plant BF 15.2.

C/04/Si 1.F. l sui'iLiD1EN i AL INFORMATIOi?

Bi'it'M20- 259 / 81047 T ch:iic al Specifi. atb.n irc o!ved 3.5.C.2, 3.5.B.5, 3.5.B.12 Itc. ported Under Tcchnical Specification 6.,7.2.b(2)

• Date due Nnr. 9/21/81. _

Date of Occurrence _ 8/,22/81 Time of Occurrence _17'l5.,_ Unit,1, 2, and 3_

deritificatiun and Description of Occurrenge A2 RHRSW pump air vacuum valve-(23-505), failed to seal; " " RHR service water pump room was ficoded. The water rendered A1, A2, A3 RHRSW/EECW pumps inoperable. This in turn rendered 2A and 3A RHR heat exchangers inoperable. Unit 1 was in refueling outage in a configuration not requiring its "A" RHR heat exchanger to be operable.

(Loop II RHR was operable.)

Conditions Prier to Occitrrence:

Unit 1 in refueling outage.

Unit 2 at 91%.

Unit 3 in maintenance outage.

Action specified in the Technical Specification Surveillance Requirements met due % inoperable equ. !pment.

Describe.

Met requirements of T.S. 4,5.B.5, 4.5.B.12 and 4.5.C.2.

?.pparen t Cause 4 0 "urrence.

Combination air and vacuum operated valve failed to seal because the float guide broke allowing misalignmtat with the float and seat.

An11vsis ( Orgrrenc.-

There vas no danger to the health or safety of the public, no release of

. activity, no damage to the plant or equipment, and no resulting significant

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chain of events.

Corre(.tive Action: A2 RHRSW pump air vacuum valve (23-505) was replaced.

All flooded components were inspected and necessary maintenance performed.

Air vacuum valves C1 (23-545) and B3 (67-590) were found broken and were also replaced..Necessary operability SI's were performed. In the future, float guides will be ins?ected every 18 months and replaced if damaged.

ljilure Data:

None lieten tior :

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