ML18283B441

LER 1977-003-00 for Browns Ferry, Unit 3, Reactor Low Water Level Scram Switch LIS-3-203D Failed to Operate During Routine Surveillance Testing

ML18283B441
Person / Time
Site:	Browns Ferry
Issue date:	03/07/1977
From:	Fox H Tennessee Valley Authority
To:	Moseley N NRC/RGN-II
References
LER-1977-003-00
Download: ML18283B441 (8)

Text

FilRI F OR M 195 I2.7BI U.S.NUCLEAR REGULATORV COI ISSION DOCKET NUMBER 50-296 NRC DISTRIBUTION FoR PART 50 DOCKET MATERIAL FILE NUMBER INCIDENT REPORT Mr.Norman C.Moseley FROM: Tennessee Valley Authority Chattanooga, Tennessee H.ST Fox DATE OF DOCUMENT 3/7/77 DATE RECEIVED 3/10/77 X(LETTER OORIGINAL IN'cop v DESCRIPTION 0 NOTO 8 IZE 0 jZUNC LASS I FIED PROP INPUT FORM ENCLOSURE NUMBER OF COPIES RECEIVED None signed Ltr.trans the following:

Licensee Event Report (RO 50-296/773) on 2/8/77 concerning the reactor low water level scram switch LIS-3-203D failing to oper'at)....

I PLANT NAME: Browns Ferry Unit No.3 (1-P)(1-P),i I'e NOTE: IF PERSONNEL EXPOSURE IS INVOLVED SEND DIRECTLY TO KREGER/J, COLLINS FOR ACTION/I NFORMATION 3 11 7=7'": "'JL=BRANCH CHIEF: W 3 CYS FOR ACTION LICo ASSTo: W CYS@CR$XS 88h&XN6 S Schwencer She ard~G'ILE INTERNAL D IST RI BUTION MIPC SCHROEDER/IPPOLITO-HOUSTON NOVAK/CHECK GRIMES CASE BUTLER HANAUER TEDESCO/MACCARY EISENHUT BAER SHAO VOLLMER/BUNCH KREGER/J COLLINS LPDR TIC: N EXTERNAL DISTRIBUTION CONTROL NUM BE R J\\'L'c<,J.'II f)1 I

.~~()g)TIO(t e O m C'~re-19<~M4 ij~>~&a<ALQ~4 g M44III;44 March 7, 1977 gfgilS ge>+'~IIA~OC4I Mr.Norman C.Moseley, Director U.S.Nuclear Regulatory Commission Office of Inspection and Enforcement Region XI 230 Peachtree Street, NQ., Suite 1217 Atlanta, Georgia 30303~4'TENNESSEE YALLEY AUTHOR[TY CHATTANOOGA, TENNESSEE 37401

Dear Mr.Moseley:

TENNESSEE VALLEY AUTHORITY-BROOMS PERRY NUCLEAR PLANT UNIT 3-DOCKET NO+50-296-FACILITY OPERATING LICENSE DPR&8-REPORTABLE OCCURRENCE REPORT BFRO-50-'296/773 The enclosed report is to provide details concerning the reactor-low water level scram switch LIS-3-203D that failed to operate during routine surveillance testing.This report is submitted in accqgdance with Browns Ferry Technical Specifications Section 6.This event occurred on Browns Perry unit 3.Very truly yours, TENNESSEE VALLEY AUTHORITY Hi Si Pox Director of Power Production

..oocrofa~/(eh~Qg u.4'4.NUCHAR R~<o 5 eoMMI 0 JAo I g)t atory Commission 20555 U.S.Nuclear Regu Washington, D.C.Enclosure (3)r CC (Enclosure):

Director (3)Office of Management Information and Program Control Office of Inspection and Enforcement U.S.Nuclear Regulatory Commission Vashington, D.CD 20555 An Equal Opportunity Employer 41 1~~

e CONTROL BLOCK:~1 LiCENSEE EVBN1 Hhl UHi SE PRINT ALL REQUIRFD INFCRti.ATIQY)

LICENSEE tJAVIE A"L Bl R F LICENSE NUMBER 3 0 0 I-IOI OI 0 0 OI-LICEtJSE EVENT TYPF TYPE 0 0 I 4 lI ll LID~013'9 14 15 25 26 30 31 32 REPORT PEPQAT CATEGORY TYPE SOURCE DOCKET NUtISER ,[DD~JCONT~L L 0'0-0 2 8 57 58 59 60 61 EVENT OESCRIPTION

.During routine surveillance testing, the EVENT DATE AEPCRT CAEE 9 6 Ot2 0 8 7 7 68 69 74 75 reactor low water level scram switch 50 89 80 LZS-3-203D failed to operate.Redundant.

switches were available and.operable.'his

}"7 89'0 is not a repetitive occurrence.

The faulty micro switch was replaced, tested, and 7 8 9 I~15 returned to service.(BFR0-50-296/773) 7 8 9 Qi3 5 BO BO'8 I~7 7 8 9 SYSiEM CAUSE CODE CODE~LA~E 2 9 10 1i1 12 CAUSE OESCRIPTION An erratic micro PRiiIE CQMPQIJEtJT SUPPUEA COMPONENT CODE N S T R U~N 17 43 CO!APQNENT MAt JUFACI UPDi B 0 810 47 VIQULTCN L~J switch was'he cause.Barton Model 288 PdTS.The, switch was 7 8 9 i~IS re laced.8 9 i+0 OTHER STATUS N/A AMOUNT OF ACTIVITY N/A OFFSITE CONSEQUENCES I Ig 7 8 8 9 LOSS OR OAliilAGE TO FACILITY TYPE DESCRIPTION Z 9 10 PUBLICITY 8 9 FACILITY STATUS%, POVVER E~Oe 7 8 9 10'-12'.13 FORM OF ACTIVITY CONTENT-RELEASEQ OF RELEASE ii 2 Z Z 7 8 9 10 11.PERSONNEL EXPOSURES NUMSER,TYPE OESCRtPTION

=}~!a~OO 0~Z 8 9'11'12-13 PERSONNEL INJURIES NUMBER OESCAIPTION

~oo o 8 9 11 12 METHOD OF OISCOVEAY B Durin 44 45.46 44 45 N/A N/A N/A N A N/A DISCOVEAY 0-SCRiPTtci J surveillance testin LOCATION OF REI.EASE BO l,, 60 80 80 BO eo iBI'OOI i ION'FACTORS N/A

<<9g O~p)6.1916 TENNESSEE VALLEY AUTHORITY CKATTANOOGA, TENNESSEE 37401 March 7, 1977 Mr.Norman C.Moseley, Director U.S.Nuclear Regulatory Commission Office of Inspection and Enforcement Region II 230 Peachtree Street, NW., Suite 1217 Atlanta, Georgia 30303

Dear Mr.Moseley:

TENNESSEE VALLEY AUTHORITY-BROWNS FERRY NUCLEAR PLANT UNIT 3-DOCKET NO.50-296-FACILITY OPERATING LICENSE DPR-68-REPORTABLE OCCURRENCE REPORT BFRO-50-296/773 The enclosed report is to provide details concerning the reactor low water level scram switch LXS-3-203D that failed to operate during routine surveillance testing.This report is submitted in accordance with Browns Ferry Technical Specifications Section 6.This event occurred on Browns Ferry unit 3.Very truly yours, TENNESSEE VALLEY UTHORITY S.Fox Director of Power Production Enclosure (3)CC (Enclosure):

Director (3)Office of Management Information and Program Control U.S.Nuclear Regulatory Commission Washington, D.C.20555 Director (40)Office of Xnspection and Enforcement U.S.Nuclear Regulatory Commission Washington, D.C.20555 An Equal Opportunity Employer h~~'a k l~f I II II J I)i I II l I'.'4 C',)I'p t[A~~)'d~~~~

'ii-zl$7 89~~21 CON'T 8 CONTROL BLOCK;1 LICENSEE NAVE L B R F 3 0 (P 6 PRINT A'R-QUIRc,o INFORVATQN) t.CEttSE TYPE F VENT TYPE LFCEttSE NUMBER 14 15 REPORT REPORT CATEGORY TYPE SOURCE OOCKET NUMBER 0 5 0-'2 z z, 57 58 59 60 61 25 26 30 31 32 9 6 0 68 69 EVENT OATE t 2 0 8 7 7 74 75 REPORT C-tE o-o ol ol o ol-ol o'zl!Izl+x~oIz'VENT OESCRIPTION

.'During routine surveillance testing, the reactor low water level scram switch-89 60 LIS-3-203D failed to operate.Redundant switches were available and.operable.This GQ 8 9's not a repetitive occurrence.

The faulty micro switch was replaced, tested, and 7 8 9 i~~5 returned to service.(BFRO-50-296/773) 8 9 GO DQ'/DS 7 8 8 9 SYSTEI.I CAUSE CODE CODE~zz E z 9 10 11 12 CAUSF OESCRIPTION An erratic micro COMPONENT CODE~.I=CO!A?DNENT SU?PUER CO!8?D.'eE!IT MAttUF'CTUPSR N S T R U~N 17.43 B OI 8I 0 47 N 48 switch was'he cause.Barton Model 288 PdIS.The.switch was CQ 7 8 9~)9 replaced.OTHER STATUS N/A AMOUNT OF ACTIVITY N/A OFFSITE CONSEQUENCES t 1~5 7 8 9 LOSS OR OAtv'AGE TO FACILITY TYPE OESCR:PTION z 9 10 PUBLICITY 7 8'~i0 I FACILITY STATUS POWERlgal.~E~oo 8 9 10 12 13 FORM OF 7 8 9 10 11.PERSONNEL EXPOSURES NUMBER~TYPE OESCR!PTION

!~!~oo o z 7 8 9'11 12'l3 PERSONNEI IN JURIES NUtABER OESCR!PTION FH~oo o 7 8 9 11 12 METHOD OF DISCOVERY 44 45 46 44 45 N/A N/A N A N/A OISCOVERY DESCRIPTION Durin surveillance testing LOCATION OF RELEAS~N/A GO'I,.r.J'i GQ 80 ego c I'OOITION'L FACTORS N/A 8 9

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