ML18283B100
| ML18283B100 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 02/19/1975 |
| From: | Eric Thomas Tennessee Valley Authority |
| To: | Case E Office of Nuclear Reactor Regulation |
| References | |
| Download: ML18283B100 (6) | |
Text
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2-19-75 2 DATE Or DOC DATE RFC'D LTR RPT OTHER TO'r. E. Case ORiG l singed CC OTHER SE(UT AEC PO R SENT LOCAL PDR CLASS UiNCLASS XXX P ROP liUFO INPUT DES Rl i?O ': Ltr trans the folloving:
NO CYS REC'0 DOCK-"T (UO 50-260 l.
ENCLOSURES:
Abnormal Occurrence Ap-50-260/
7?I32W on 12-4-74 re failure of flov control valve....
PLAiUT NA(~'1E:
Browns Ferry Unit 2.
(1 cy encl rec(d)
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4 TENNESSEE 'ALLEYAUTHORITY CHATTANOOGA. TENNESSEE 37401 February 19, 1975 jggUIgop QQcket Fits'r.
Edson G. Case Acting Director of Licensing U.S. Nuclear Regulatory Commission Washington, DC 20545
Dear Mr. Case:
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('kgil ~i TENNESSEE VALLEYAUTHORITY - BROWNS PERRY NUCLEAR KANT UNIT 2-DOCKET NO. 50-260 - FACILITY OPERATING LICENSE DPR ABNORMAL OCCURRI2ICE REPORT BFAO-50-260/7432W The enclosed. report is to provide a followup on the inspection of valves in similar positions on both units 1 and. 2 as the flow control valve which f'ailed, on December 4, 1974.
The failure in December was reported by'bnormal Occurrence Report BFAO-50-260/7432W transmitted.
by letter of December 13, 1974.
Very truly yours, TENNESSEE VALLEY AUTHORITY E. F.
Thomas Director of Power Production Enclosure CC (Enclosure):
Mr. Norman C. Noseley, Director U.S. Nuclear Regulatory Commission Regiona1 Office 230 Peachtree Street, Nli., Suite 818 Atlanta, Georgia 30303 CP co~
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'RegUIatory Docket,Fife ABNORhSL OCCURRED>CE REPORT Report Ho.:
BFAO-50-260/7432lil (Followup Report)
Report Date:
February 19, 1975 Occurrence Date:
December 4, 1974 Facility:
Browns Ferry Nuclear Plant unit 2 Desi ation of Aa arent Cause of Occurrence Refer to Abnonr& Occurrence Report BFAO-50-260/7432M.
Corrective Action All valves in similar positions on both units 1 and 2 to the failed va1ve reported in the subject abnormal occurrence report have subsequent~
been
. disassembled, inspected, and repaired.
The tack welds were found oroken on all three valves.
The disc had rotated approximately two inches and one inch circumferentially on valves 74-66 and 74-52, respective, on unit l.
Tne disc had not rotated on 74-52 on unit 2, Repairs were made by grinding off the broken tack welds and reweld.ng with large fillet welds in accordance with approved instructions.
Valve Data I'~ufacturer - Nalworth Company, Greensburg, PA 24" pressure seal angle glooe valve with limitorgue operator.
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>lalworth Company drawing A-12337-Mi-E
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