ML20085H137

AO BFAO-50-260/7412W:on 740903,main Steam Line D Outboard Isolation Valve FCV 1-52 Failed to Close within Tech Spec Limits.Caused by Loss of Oil in Valve Dashpot Cylinder Due to Leakage Through Loose Oil Fill Plug

ML20085H137
Person / Time
Site:	Browns Ferry
Issue date:	09/12/1974
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Case E US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 8308300230
Download: ML20085H137 (2)

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September 12, 1974 l ll/ *,

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ANBfNG GN BLANIEbEN tj .

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Acting Director of Licensing q( g'$[i 51s, fs

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U.S. Atomic Energy Comission e i.J'<;b/l/

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Dear Mr. Case:

TEliHESSEE VIJ1EY AUTEORITI - BROWS FERRY IIUCLEAR PLANT UNIT 2 -

' DOC 12T NO. 50-260 - FACILITY OPERATEG LICENSE DPR ABNOPl@.L OCCURREIICE REPORT BFAO-50-260/7412W The enclosed report is to provide details concerning FC71-52 main steanline "D" outboard isolation valve which failed to close within 3 to 5 seconds as required by the technical specifications [

cnd is submitted in accordance with Appendix A to Regulatory j' Guide 1.16, Revision 1, October 1973. This event occurred on Brouns Ferry Nuclear Plant unit 2 on September 3,1974.

g Very truly yours, TEIINESSEE VALLEY AUTHORITY

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E. F. Thomas -

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Director of Power Production a

Enclosure CC (Enclosure):

Mr. Norman C. Moseley, Director Region II Regulatory Operations Office, USAEC 2

230 Peachtree Street,liW., Suite 818 Atlanta, Georgia 30303 a

v s 8308300230 740912 PDR S ADOCK 05000260 PM . .

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l ABNORMAL OCCURREtiCE REPORT -

I Report ITo.: BFAO-50-260/7412W

, Report Date: September 12, 1974 I Occurrence Date: September 3 1974 Facility: Browns Ferry Iiuclea Plant unit 2

, Identification of Occurrence l FCV 1-52 main steaaline "D" outboard isolation valve failed to close within l 3 to 5 seconds as required by the technical specifications.

l l _ Conditions Prior to Occurrence l

1 The reactor was in the startup test program at approximately 25-percent power.

l Description of Occurrence l

While conducting a recuired surveillance test at 0210 on September 3,1974, FCV 1-52 closed in 0.8 seconds.

Designation of Atmarent Cause of Occurrence i

The cause of failure was the loss of oil in the valve dashpot cylinder resulting l from leakage through a loose oil fill plug.

Analysis of Cecurrence The inboard isolation valve FCV 1-51 was closed and remained closed until FCV l 1-52 was fully operable. There were no adverse effects on the health or safety of the public as a result of this failure.

l Corrective Action

A steam tunnel entr/- vas made during unit operation on September 3, 1974 The oil dashpot cylinder was refilled with oil, the oil fill plug was tightened securely, end the auto-ponent flow control valve was adjusted to-restore the valve closure time to acceptable limits.

l Failure Data l See Abnormal Occurrence Reports: EFAO-743&T, Unit 1 BFAO-7412W, Unit 1 l BFAO-742W, Unit 1 Valve Data 26" tain steam isolation valve Manufacturer: Atwood and l'orrill Company Salem, l'assachusetts Valve Drawing Iro.: 20851-H,' Sheets 1-and.2

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