ML18283B000

LER 1978-002-00 for Browns Ferry Nuclear Plant, Unit 2, Reactor Pressure Switch PS-68-95 Not Functioning as Required by Tech Spec Table 4.2.B During Normal Operation While Performing Surveillance Instruction ST 4.2.B-7

ML18283B000
Person / Time
Site:	Browns Ferry
Issue date:	02/13/1978
From:	Fox H Tennessee Valley Authority
To:	O'Reilly J NRC/IE, NRC/RGN-II
References
LER 1978-002-00
Download: ML18283B000 (6)

Text

REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS>

DISTRIBUTION FOR INCOMING MATERIAL 50-260 REC: OREILLY J P ORG: FOX H S DOCDATE: 01/13/78 NRC TN VALLEY AUTH DATE RCVD: 02/16/78 DOCTYPE: LETTER NOTARIZED: NO COPIES RECEIVED

SUBJECT:

LTR 0 ENCL 1 LICENSEE EVENT REPT (RO 50-260/782> ON 01/14/78 CONCERNING REACTOR PRESSURE SWITCH PS-68-95 WOULD NOT FUNCTION AS REQUIRED BY TECH SPEC TABLE 4. 2. B. DURlNG NORMAL QPERATION WHILE PERFORMING

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SURVEILLANCE INSTRUCTIQN SI4. 2. 8-7.

PLANT NAME: BROWNS FERRY UNIT 2 REVIEWER INITIAL: X JM DISTRIBUTOR INITIAL:

DISTRIBUTION OF THIS MATERIAL IS AS FOLLOWS INCIDENT REPORTS (DISTRIBUTION CODE 'A002>

FOR ACTION: BRA k44sHk6 EAR+4W/4 ENCL INTERNAL: --EILE+%W/E NRC PDR++W/ENCL I 4 E<+W/2 ENCL MIPC+4W/3 ENCL SCHROEDER/IPPOL I TO++W/ENCL HOUSTON+~~W/ENCL NQVAK/CHECK4+W/ENCL GRIMES'W/ENCL KNIGHT++W/ENCL BUTLER++W/ENCL HANAUER<+W/ENCL TEDESCO+<W/ENCL EISENHUT++W/ENCL BAER~~W/ENCL SHAO~~W/ENCI VOLLMER/BUNCH++W/ENCL KREGER/J. COLL I NS++W/ENCL ROSA++W/ENCL L. CROCKER~E4 W/ENCL K SEYFR I 7/IE+4W/ENCL EXTERNAL: LPDR'S ATHENS'L++W/ENCL TI C44 W/ENCL NSIC++W/ENCL ACRS CAT 84+W/16 ENCL COPIES 'HOT SUB>(ITTED PER REGULATORY GUIDE 10. 1 DISTRIBUTION: LTR 46 ENCL 46 CONTROL NBR: 780480223 S I ZE: 1P+ iP THE END

TENNESSEE VALLEY AUTHORITY

'EB13 1978 CHATTANOOGA. TENNESSEE 37401

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~/Pfg g-Mr. James'. 0'11y, Director o~ /g U.S. Nuclear R gulatory Commission R ~eo~~

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I ~Pg Office of Xns ection and'Enforcement . I~~rp++ro p Region XX 230 Peachtr e Street, El.> Suite 1217 C Atlanta, or+a. 30303

'ear Mr. O'Reilly:

TENNESSEE VAIZZiYAUTHORITY BROWS FERRY NUCLEAR Ehm UZET 2 <<

DOCKET MO. 50-260, FACILXTY OPERATING LICENSE DPR~52 - REPORIABLE OCCURRENCE REPORT BFRO-50-260/782 The enc1osed report provides details concerning reactor pressure switch PS-68>>95 which would not function as required by Technical

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Specification Table 4.2.B during normal operation while performing surveillance instruction SI 4.2.B-7. this report is submitted, in accordance with Brooms Ferry unit 2 Technical Specifications, Section 6.7.2.b.(3.).

Very tru1y yours, TENMBSEE VALLEY AUTHORITY Ho So Fox Director of Power Production Enclosure cc (Enclosure):

Director (3)

Office of Management Informati n and program Contro1 U.S. Nuclear Regulatory ComislIbjion Mashi on DC 20 Director (40)

. Office of, Inspection and Enforcement U.S'uclear Regulatory Commission Mashington, DC 20555

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UCENSEE EVENT REPORT EXHlB(T A lPLEAsE PRINT GR TYPE AI.L REQUIRED INFDRMATION1 I 6.

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"""I aa r CDCaIET IaVMSE R 64 69 EVENT DATE REPOR't DATE 60 0

. EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Olo During normal operation, while performing surveillance'i'nstruction 3

S X 4. 2 ~ B 7, r e a c t o r p re s s u r e sw it ch P S 6 8 9 5 wo u 1 d no t fun c tio n as re u ir e d by T.S .. Table 4. 2.B. No hazard to the 'public health 'or safety existed.

Redundant switches were operable.

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' cAusE cAUsE AS SUSCDDf CDAIP. VALVE

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CODE CODE COMPONENT CODE SUSCODK SUSCODE

~OB 2 8 8 10 L'aS 11 12 13 18 LJS LaS 19 20 SEDUENTIA'L OCCURAENCK Af PORT REVISION I~r'03

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EV'fNT YEAR Qaa LEA(RO a aaaar ~78 21 22

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~00 REPORT NO.

2 a7 29 COOK "9

TYPE

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32 I'S I'S I'0 ACTION FUTURE EFFECT SHUTDC!9 I ATTACHL'fa4T IIPAO4 PtaIME COLIP. COMPONfNT TAKEN AC'110N 33 34 Oal PL 35 "IT CAUSE DESCRIPTION AND CORRECTIVE ACTIONS I "6 ~ aau3 6 32 Q1 HOURS +22 SuSMI Ttfo LJS 41 FDRhl >US.

I 41 "IS ZJS SupPUKR 44 MANuFACTurKR

'C Moisture caused microswitch failure by corrosion of contacts. Switch is aazl I housing microswitch was replaced. and. recalibrate6.

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FACILITY STATUS 2 ~09

% POWER 0Qs OTIIKASTATuS N4 Q MKTHDD OF DISCOVERY DISCOVKAY DESCRIPTION Q32 Surveillance Instruction Qaa ~B Q31 2 8 9 ~

0 12 44 ACTIVITY COII TfNT RELEASED OF RELEASE AMOUNTOF ACTIVITYQ38 LOCATION OF RELEASE Q38 B ~Z Q33 ~ZQ3, NA NA

'NA 2 8 9 10 I! 44 46 PEASONNfL FXPOSURES IIUMSER TYPE OESCRIPtION Q39

~00 0 Qaa ~Z Qla 1 8 9 11 12 13

~ KASONNEI. INJURaf 5

~ 2 8 9 11 12 lOSSOF OR DaalACE toPACIUTY TYPE OESCRIPtlON Q43 jii~) ~ZQ42 2 8 9 10 NllIL PUSLICITY NRC USE ONLY l

8 9 10 68 63I NAME OF PREPARER PHONE:

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