ML20113D290

Special Rept 96-03:on 960612,bypass Reactor Trip Breaker 2A Failed to Open.Caused by Unknown,Possible Matl Deficiency. Chipped Block & Shunt Trip Coil Replaced & Breaker re-tested & Returned to Svc

ML20113D290
Person / Time
Site:	Mcguire
Issue date:	06/26/1996
From:	Mcmeekin T, Pitesa J DUKE POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
96-03, 96-3, NUDOCS 9607030084
Download: ML20113D290 (3)

Text

. . . . . . . . - . - . . - - , - . - _ ~ ~ . . - . - _ . ~ . .

il l DufeIbu er Company T C A131am

=

r kklinixNuclearGenerationDepartment lice President 11700Hagers FerryRoad(AIGOlVP)

(M1)875-1800

- Huntmri!!e, NC28078%IO (704)2754809 Fax a

DUKEPOWER

! DATE: June 26, 1996

} U.S. Nuclear Regulatory Commission 4

I Document Control Desk Washington, D.C. 20555 A

Subject:

McGuire Nuclear Station Unit 2  !

Special Report 96-03 4

Problem Investigation Process No.: 2-M96-1690

)

1 Gentlemen:

l 3 Pursuant to McGuire Nuclear Station License Condition 2.C(12), attached is Special Report 96-03 concerning Failure Of Reactor Trip Bypass

!' Breaker 2A Due To An Unknown, Possible Material Deficiency. This event is considered to be of no significance with respect to the health and i i

safety of the public.

]

l Very truly yours,

\

.C. McNeekin l

JWP/bcb 1

i Attachment cc Mr. S.D. Ebneter INPO Records Center l Administrator, Region II Suite 1500  !

i U.S. Nuclear Regulatory Commission 1100 Circle 75 Parkway l 101 Marietta St., NW, Suite 2900 Atlanta, GA 30339

} Atlanta, GA 30323 l

Mr. Victor Nerses Mr. George Maxwell U.S. Nuclear Regulatory Commission NRC Resident Inspector Office of Nuclear Reactor Regulation McGuire Nuclear Station Washington, D.C. 20555 030015 9607030084 960626' PDR 7y S

ADOCK 05000370 -

PDR I w on o w w w - { I J

1 1

l

, -bxc B. L. Walch (EC11C) l A. L. Taylor (CNS)

'G.*A. Copp (EC050) l J. I. Glenn (MG02ME)

P. R. Herran (MG01VP)

C. B. Davis (MG01CP)

^

J. E. Burchfield (ONS Reg Compliance)

G. H. Savage (EC06E) I

. G. B. Swindlehurst (EC11-0842)

) C. M. Misenheimer (EC08I) l R. F. Cole (EC05N) l J. M. Frye (EC05N)

T. G. Becker (PB02L)

P. M.

Abraham (EC08I) 1

, R. B. White (MG01VP)

L. V. Wilkie (ONO3SR) I D. P. Kimball (CN05SR) a K. L. Crane (MG01RC)

R. N. Casler (EC05N)

{ NSRB Support Staff (EC05N) {

i i

1 1

4 4

4 l

j l

i d

1 1

t i

4 4

l i

[ l l i NRC FORuy U S NUCLEAR RE7AATOaY COMMISSION t.PPROVED EY OMI NO. 31504104 EXPIRES 04/30m8 g

'e .

• b ESTIMATED BURDEN PEH RESPONSE TO COMPLY WITH THIS i MANDATORY INFORMATION COLLECTION REQUEST: 50.0 HRS.

4 REPORTED LESSONS LEARNED ARE INCORPORATED INTO THE 1 LICENSEE EVENT REPORT (LER) UCENSINO PROCESS AND FED BACK TO INDUSTRY, FORWARD l COMMENTS REGARDING BURDEN ESTIMATE TO THE INFORMATION I AND RECORDS MANAGEMENT BRANCH (T 6 F33). U.S. NUCLEAR REGULATORY COMMISSION, WASHINGTON. DC 205554)001. AND TO THE PAPERWORK REDUCTION PROJECT (3150-0104), OFFICE OF MANAGEMENT AND BUDGET. WASHINGTON. DC 20503 FACtLITY NAME (1) DOCKET NUMBER (2) PAGE (3) 4 MCGuire Nuclear Station, Unit 2 05000370 10F1 TITLE (4)

Failura Of Reactor Trip Bypass Breaker 2A Due To An Unknown, PoSSible Material Deficiency EVENT DATE (5) LER NUMBER (6) REPORT DATE (7) oTHER FACILITIES INVOLVED (8)

MONTM DAY YEAR YEAR ,. SEQUENTlAL s RhiVlalON MONTH DAY YEAR FAClWTY NAME

? NUMBER '

NUMDER DOCKET NUMBER (S)

N/A 05000

06 12 96 N/A N/A N/A 06 26 96 05000

' OPERATING THIS REPORT IS SUBMITTED PURSUANT TO THE REOUIREMENTS OF 10 CFR (Check one or more of the followino)(11 MODE (9) 5 20.402(b) 20.405(c) 50.73(a)(2)(ev) 73.71(b) r OWER 20.405(a)(1)(i) 50.36(c)(1) 50.73(a)(2)(v) 73.71(c)

LEs'EL (10) 0% 20.405(a)(1)(ii)

E ~ L 50.36(c)(2) 50.73(a)(2)(vii) 1 OTHER(Specify#1 4 20.405(a)(1)(iii) 50.73(a)(2)(i) 50.73(a)(2)(viii)(A) Abstract bebw and IL $ 20.405(a)(1)(iv) 50.73(a)(2)(ii) #1 Terf, NRC Forrn

' 50.73(a)(2)(viii)(B)

$ < - r >( 20.405(a)(1)(v) 50 73(a)(2){iii) 50.73(a)(2)(x) 3664)

LICENSEE CONTACT FOR THIS LER (12)

NAME TELEPHONE NUMBER AREA CODE J. W. PiteSa l (704) 875-4788 l COMPLETE ONE LINE FOR EACH COMPONENT FAILURE DESCRIBED IN THIS REPORT (13) I AS. 9 e a. j CAUSE SYSTEM COMPONENT MANUFACTURER REPORTABLE TO NPROS M

W%

CAUSE SYSTEM COMPONENT MANUFACTURER REPORTABLE TO NPRDS hj W

I X RDK CKTBRK W120 YES 4

% hf s, j SUPPLEMENTAL REPORT EXPECTED (14) EXPECTED MONTH DAY YEAR I

SUOMISSION X YES (f yes, complete EXPECTED SUBMISSION DATE) NO DATE (15) 07 26 96 b A'STRACT (Umit to 1400 spaces, i.e. approximately fifteen single-space typewntten knes)(16) \

Unit Status: Unit 2 was in Mode 5, Cold shutdown, at 0 percent Reactor power.

1 Sp;cial Report 96-03 is being submitted in accordance with McGuire Nuclear Stction , Unit 2, License Condition 2.C(12).

1 Event

Description:

During the Unit 2 Train A SSPS Monthly Test on June 12, 1996, it was discovered that Unit 2 Bypass Reactor Trip Breaker BYA would not open. electrically in the test position. The breaker failed to open on several attempts.

EvInt Cause: A cause of Unknown, Possible Material Deficiency has been assigned. Investigation revealed that a piece of the block for the Breaker Secondary Contact Assembly was chipped off. It was also noted that contact 4 (unrelated to the Shunt Trip Circuitry in question) was deformed / bent in such a manner that the position of the contact was higher than the other contacts in the assembly.

Corr &ctive Action: The chipped block was replaced with a new block assembly from the warehouse. In addition, the shunt trip coil was replaced as a conservative measure. The breaker was re-tested and placed back in service.

Inspections were performed on 6 of the 7 remaining reactor trip breakers on both units, looking for chipped blocks as well as deformed / bent contacts.

The remaining breaker is scheduled to be inspected in early July, 1996. A thorough cause investigation will be completed by July 26, 1996.

NRC FORM 366

<