ML18283B437

LER 1977-005-00 for Browns Ferry, Unit 3, a & B RPS MG Sets Failed to Trip During Startup Test, ST1 31, Loss of T-G, and Off Site Power Test

ML18283B437
Person / Time
Site:	Browns Ferry
Issue date:	03/24/1977
From:	Fox H Tennessee Valley Authority
To:	Moseley N NRC/RGN-II
References
LER 1977-005-00
Download: ML18283B437 (14)

Text

U.S. NUCLI:AR fIL'GULATOkvCOMMISSION D0CJC E T,NUM llf.'l NIIG-I-OIPM-19b I2. 7III So-'g.p FILE NUMRLR NRL'~DIE~>(IBUTION vo&rART EO DOCI<ET MATERIAL INCIDENT REPORT TO Mr" Norman C. Moseley FROM: TVA DATE OF DOCUMCNT Chattanooga, Tenn, 37401 3-20-77 H,ST Fox DATE flECEIVE D 3-29-77 LETTER ONOTORIZED PROP INPUT FORM NUMBER OF COPIES RECEIVED DORIGINAL li8UNC LASS I F I E D

&COPY ( CC DEECRIPTloN Ltr trans the folio'wing: 1P ENcLosU~E Lic Event Report 77-5 occurring on 9-27-76 invoving,k & B RPS MG set's failed to trip during startup test ~ ..2P ~

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PLANT NAME: Browns Ferry Unit 3

'ACKNOWLEDGED NOTE: IF PERSORKL EZPOSURE IS INVOLVED SEND DIRECTLY TO KREGER/J, COLLINS FOR ACTION/INFORMATION RANCH .CHIEF:

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TENNESSEE VALLEY AUTHORITY

~m CHATTANOOGA. TENNESSEE 37401 1~)6-1916 March 24, 1977 Qzcb~~~

Mr. Norman C. Moseley, Director gag. 4 )Ql7 U.S. Nucleax Regulatory Commission 1t L@8gP galls~+

ggt@ (~i 1t Office of Inspection and Enforcement Region II 230 Peachtree Stx'eet, NM., Suite 1217 Atlanta, Georgia 30303

Dear Mr. Moseley:

Ftto eg, TENNESSEE VALLEY AUTHORITY - BROGANS PERRY NUCLEAR PLANT UNIT 3 DOCKET NO. 50-296 PACILITY OPERATING LICENSE DPR&8 - REPORTABLE OCCURRENCE REPORT BPRO-50-296/775 The enclosed report is to provide details concerning A and B &S MG sets which failed to trip during startup test, STl 31, loss of T-G, and off site power test. This report is submitted in accordance with Browns Perry Technical Specifications Section 6. This event occuxred oa Browns Perry unit 3.

Very truly yours, TENNESSEE VALLEY AUTHORITY H< ST 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 (40) I'irector Office of Inspection and Enforcement U.S. Nuclear'egulatory Commission Uashin ton, D.C. 20555 An Equal Opportunity Employer 770$ pyz/y

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SEE EVENT REPORT CONTROL 8LOCK: (PLEASE PRINT ALL REOUIREO INFORMATION)

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,AI,II LCENSE NUMBER TYPE rv>>r, i!'I A L B R F 3 0 0 0 0 0 0 0 0 0 4 1 1 1 1 ~0033 14 15 25 26 30 31 32

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AEPUAI lvPE REPIIAI SOUCI:E DOCKET NUMQER EVENT ORTS AFI'ORI'AIP 1, 1. 0 5 0 0 2 9 6 0 9 2 7 7 6 57 58 59 60 61 68 69 74 75 80

. i."IT OFSCRIPTION A and B RPS MQ sets failed to tri durin startu test STX 31 Loss of T-G and I 80 off-site ower te t 80 80 80 PAME 80

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I ILM CRUSE COMPONENT COMPOBIENT I'I OE CODE COMPONENT CODE SUPPLIER MANUFACTURER

~BB B 0 K V B N G 0 8 0 7 9 9 10 11 12 17 43 44 47 48 CALISE OESCRIPTION SEE ATTACKKNT 80 I I3 9 80 I

9 80 F CTUTY METHOD OF StATUS Vi POWER OTHER STATUS DISCOVERY DlscovEAv DEscnlpnoN 9

B ~03 13 NA 44 45 46 80 10 12 FORM Of TCTLVITY CONTENT ttf:EASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE Z E NA NA

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9 10 11 44 45 80 PETISONNEL EXPOSURES 80 PERSONNEL INJURIES DESCRIPTION 0 0 8 9 11 12 ao OTFSITE CONSEQUENCES NA I.OSS OR OAMAGE TO FACILITY

~ +z 10 OESCA.PTIJN NA 80 I'lIEILICITY t

~ ~ I RCOITIONAL FACTORS

/cram within 5 seconds after loss of auxiliar ower as s ecified in FSAR section 14.5.4.4(b) did not occur.

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CAUSE DESCRIPTION 4 Time delay trip relays were out of adjustment and output breakers, GE

>] '"~hi type TFK2267225 with UV relhlse, dz.d not operate correctly. The time delay relay was recalibrated and the output breaker reset to activate the UV trip. The reset of the output breaker requires a unique sequence which was not recognized initially. Investigation of the failure to trip revealed that the reset instructions requiring the breaker trip coil to be energized when the breaker is reset were on the side of the breaker and difficult to see with the breaker in place. This operating requirement was not generally known. The proper reset sequence has since been conspicuously posted at each breaker. (BFRO-50-296/775)

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TENNESSEE VALLEY AUTHORITY m CHATTANOOGA. TENNESSEE 8740t

'~~s-ice March 24, 1977 ~eg6 9 Mr. Norman C. Moseley, Director U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region II 230 Peachtree Street, NI4., 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-50-296/775 The enclosed report is to provide details concegning,A and B RPS MG sets which failed to trip during startup t'est, STl 31, loss of T-G, and off site power test. 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 AUTHORITY H. . Fox Director of Power Production Enclosure (3)

CC (Enclosure):

Director (3)

Office of'Management Information and Program Control U.S. Nuclear Regulatory Commission Uashington, D.C. 20555 Director (40)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Hashington, D.C. 20555 An Equal Opportunity Employer

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L NSEE EVENT REPORT CONTROL 8LOCK: (PLEAOE PRIIVT ALL REOLIIRED llUFORlHATtohll f

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's.ss I!CENSE NUMBER LICENSF.

TYPE

'VFNT TYIsE

~ 'I Al LI B R F 3 0 0 0 0 0 0 0 0 0 4 1 1 1 1 ~03 14 15 25 26 30 31 32 AEPeIAI AFPI)A'I CA'f IIO!'< I YPE SOURCE OOCKET NUMBER E'VENT GATE AFlsOAT OAle

~L L 0 5 0 0 2 0 9 2 7 7 6 57 58 59 60 61 69 74 75 80

~ .'i."lT OESCRIFIT ION A and B RPS MG sets failed to tri durin startu test STX 31 Loss of T-G and 80

~i I off-site ower te t 80 l~ 'I s 80 80 FAME 80

~,s Tert M CAUSE COMPONENT COMPONENT IT,Ue COO E COMPONENT COOE SUPPUEA MANUFACTURER V!OLAT!ON

!~SH K 0 K r B ~N G 0 8 0 N 7 8 9 10 11 12 17 43 44 47 48 CAUSF OESCRIPTION

~l-'~ SEE ATTACHMENT 80 80 I

8 9 80 FAC!UTY METHOD OF STATUS ee POWER OTHER STATUS OISCOVEAY OISCOVEAY QESCA!PTION B ~0 NA 9 10, 12 13 44 45 46 rorssI OF ACT!VITY CONTENT ssCI FASFO OF RELEASE AMOUNT QF ACTIVITY LOCATION OF RELEASE Z H NA NA 8 9 10 11 44 45 80 PETISONNEL EXPOSURES

~l~ I pJ NA 80 PERSONNEL INJURIES OESCA!PTION 0 0 9 11 12 OTFSITE CONSEQUENCES

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80 I.OSS OR OAMAGE TO FACILITY

' F 0" SCA!PTION Z

10 80 I'IIBLICITY OITIONAL FACTORS cram niacin 5 secongs afrer loss of anxi1iar ower as s ecified in FBAR secrion l

14.5.4.4(b) did not occur.

Nil

0 C' CAUSE DESCRIPTION Time delay trip relays were out of adjustment and output breakers, GE type TFK226Y225 with UV release, did not operate correctly. The time delay relay was recalibrated and the output breaker reset to activate the UV trip. The reset of the output breaker requires a unique sequence which was not recognized initially, Investigation of the failure to trip revealed that the reset instructions requixing the breaker trip coil to be energized when the breaker is reset were on the side of the breaker and difficult to see with the breaker in place. This operating requirement was not generally known. The proper reset sequence has since been conspicuously posted at each bxeaker. (BFRO-50-296/775)

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