ML20084U276

LER BFRO-50-260/7616:on 761115,electric Hydraulic Control Loss of Fluid Pressure Switch PS-47-142 Failed to Give Half Scram When Tested.Caused by Pressure Switch Plugged W/ Teflon Tape.Switch Cleaned

ML20084U276
Person / Time
Site:	Browns Ferry
Issue date:	12/08/1976
From:	Fox H TENNESSEE VALLEY AUTHORITY
To:	Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
LER-BFRO-50-260-761, NUDOCS 8306280475
Download: ML20084U276 (2)

Text

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. . OLICENSEE v EVENT. REPORT O V l l l (PLEATE PRINT ALI, REQUIRED INFORM ATION) .

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' EVENT DATE REPORT DATE

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l Ll h0u E DOCKET NUMBER l Ll l 0l 5l 0l-l -l 2l 6l 0l 68 l1l1l1\5l7l6l 69 74 l

75 l l l l l 80 l l

/ 8 57 58 59 60 61 EVENT DESCRIPTION j g ] During startup testing, EHC loss of fluid pressure switch PS-47-142 failed to give80a r 89 Q l htlf scram when test'ed. The three remaining pressure switches operated satisfactor 80 89' f5IdllThisisnotarepetitiveproblem. The switch was removed, cleaned, and returned to 80

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7 89 l h l service. BFRO-50-260/7616 80 7 49 05 l 80 pay, 3 09 MANUF C UAER VOLATON CE 37 lI l Al (j CODE COMPONENT ' CODE lIlNlSlTlRlUl17 @ 44 l Bl 0l 7l 0l47 @ 48 12 43 7 69 10 11 CAUSE CESCRIPTION l

38 l The Barksdale model TC9622-3 pressure switch was found to be plugged with teflon 80 7 89 l Q l tape which prevented operation. 80 7 89 I Fl 7 8 METHOO OF nCurY DISCOVERY OtSCOVERY DESCA PTON

% POWER OTHER STATUS Q

STATUS W l 0l 4l 8] l NA l y l 46 Surveillance Test 80 l

9 10 12 13 44 45 7 8 .

LOCATON OF AELEASE OF EL ASE AMOUNT OF ACTMTV AELE $10 NA l 12 7- 8 W

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45 l 80 PEPSONNEL EXPOSURES b;UYBER TYPE DESCAiPTON l NA 13 l0l0]0l @ 12 l

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80 7 89 11 PERSONNEL INJUA:FS P4UMBEA DESCRPTON l NA 8 10101 0111 7 89 i

12 80 OFFSITE CONSEQUENCES "

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NA 8306280475 761200 LOSS OR OAMAGE TO FActuTY PDR ADOCK 05000260 .

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80 7 89 ADDITIONAL FACTORS l

l The switch u s removed'and c'1 caned, When the tape was removed and satisfactorv 80 l7 a9

• l f g.l, instrument operation verified, it was returned to service. -

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l jow"%g U V fE FILE m 9 TENNESSEE VALLEY AUTHORITY g g g a CH ATTANGOGA. TENNESSEE 374o1 Ip

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, December 8, 1976 Mr. Norman C. Moseley, Director U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region II 230 Peachtree Street, NW., 8th Floor Atlanta, Georgia 30303

Dear Hr. Hooeley:

TENNESSEE VALLEY AUTIl0RITY - ER0!MS FERRY NUCLEAR PLANT UNIT 2 -

DOCKET NO. 50-260 - FACILITY OPERATING LICENSE DPR REPORTABLE OCCURRENCE REPORT BFRO-50-260/7616 The enclosed report is to provide details concernin;; E11C loss of fluid prensura cwitch PS 142 that failed to give a half scran when tected during startup testing. Thin report in subnitted in accordance with Browns Ferry Technical Specifications Section 6. This event occurred on Browns Ferry Nuclear Plant unit 2.

Very truly yours, '

\jj_

TENNESSEE VALLEY AUTIIORITY I r*

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ir ct of Power Production ,

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"Enclooura (3)

CC (Enclosure):

Director (3)

Office of Manag ent Infornation and Program Control U.S. Nuc1 car Re ulatory Commission Washington, D.C . 20555 Director (40)

Offico of Inspection and Enforcement U.S. Nuclear Reguintory Coramission Washington, D.C. 20555 r

An Equal Opportunity Employer

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