ML20085H137
| 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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BLANIEbEN September 12, 1974 tj p']
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Acting Director of Licensing q(
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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
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cnd is submitted in accordance with Appendix A to Regulatory Guide 1.16, Revision 1, October 1973. This event occurred on j'
Brouns Ferry Nuclear Plant unit 2 on September 3,1974.
g Very truly yours, TEIINESSEE VALLEY AUTHORITY
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E. F. Thomas 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
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8308300230 740912 PDR ADOCK 05000260 S
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l ABNORMAL OCCURREtiCE REPORT
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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 While conducting a recuired surveillance test at 0210 on September 3,1974, l
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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