ML18096A497

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LER 92-001-00:on 920104,2A Vital Bus Tripped During Transfer of Bus from Station Power Transformer.Caused by Equipment Failure.Failed Fuse replaced.W/920130 Ltr
ML18096A497
Person / Time
Site: Salem PSEG icon.png
Issue date: 01/30/1992
From: Pollack M, Vondra C
Public Service Enterprise Group
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-92-001, LER-92-1, NUDOCS 9202050423
Download: ML18096A497 (4)
v • d • e


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  • ti*.*G9 Public ServJce Electric and Gas Com~any P.O. Box 236 Hancocks Bridge, New Jersey 08038 Salem GeneratingStation January 30, i992

. U. s ~ Nuclear Regulatory Commission_*

Document Control Desk Washington, DC 20555

Dear Sir:

SALEM GENERATING.STATION LICENSE NO. DPR-75 DOCKET NO. 50-311 UNIT NO. 2 LICENSEE EVENT REPORT* 92~001-00 This Licensee _Event Report is *being* submitted pursuant to the requir~ments of the Cbde.of Federal Regulations 10CFR

  • 50.73(a) (2) (iv). This* report is required to be issued' within thirty (30) days of.event discovery.

yours, C. A. Vondra General Manager -

Salem Opera t.ions MJP:pc Distribution.

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1~i '11 9202050423 920130 95-2189 (10M) 12-89 PDR

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NRC FORM 366 . U.S. NUCLEAR REGULATORY COMMISSiON (6~9). .*. APPROVED OMB NO. 3150-0104 . .-

    • EXPIRES: 4/30/92 *
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E !MATED BURDEN PER RESPONSE TO COMP.LY WTH T-HIS INFORMATION COLLECTION REQUEST: 50.0 HRS. FORWARD LICENSEE EVENT REPORT (LER) COMMENTS REGARDING BURDEN ESTIMATE TO THE RECORDS

- AND REPORTS MANAGEMENT BRANCH (P-530), U.S: NUCLEAR REGULATORY COMMISSION, WASHINGTON, DC 20555, AND TO THE PAPERWORK REDUCTION PROJECT (3150-0104), OFFICE OF MANAGEMENT AND BUDGET, WASHINGTON, DC 20503.

FACILITY NAME (1) DOCKET NUMBER (2) T PAGE 131 Salem Generating Station - Unit 2

.TITLE (4)

- o 15 1o 1o 1o 1.3 11 11 r , 1OF o 13 ESF Signal Ac_tuatiOn: _ 2A. 4KV Vital Bus Undervoltage Due To Equipmen~ Failure (Fuse)

EVENT DATE (6) LEA NUMBER (6) REPORT DATE (7) *-- OTH.ER FACILITIES INVOLVED (8)

MONTH DAV VEAR VEAR FACILITY NAMES DOCKET l>.jUMBER(S).

O 1s1010101_ I I 0 11 0 4I 9 2 91 2 - ol 0I1 - 0 lo. 0 I1 3 r0 912 THIS REPORT IS SUBMITTED.PURSUANT.TO THE R~OUiREMENTS OF 10 CFR .§: (Ch~ck ans or mar* of th* following) (11).

OPERATING MODE (9)

D 20.402(b)

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20.405(c) x 60.73(1)(2)(iv) i..;,,,;,,,..

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20.405(1)(1)111 5o:3&(c)(1) 60,73(1)(2)(v) 13.111i:1

~ t-20.405(~)(1)(ii). 50.3B(c)(2) &0.73loH2Hviil OTHER (Spacify in Abstroct i---..:.. t- b*low *nd in TttMt. NRC Form

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20.4o&(1)(1 )(Iv)

......_ &0.73(1)(2Hlil 60.73(1) (2) (viii) (B) 20.405(1)(1 )(v) 50.73.(1)(2Hiiil *&0.73(1)(2)(*1 LICENSE!' CONTACT FOR THIS LER (12)

NAME TELEPHONE NUMBER AREA CODE M. J; Pollack - LER Coordina~or 6 I 0 19 3 13 IQ I.- I? I n I ? I?

COMPLETE ONE LINE FOR EACH COMPONENT FAILURE DESCRIBED IN THIS REPORT (131 MANUFAC- MANUFAC**

CAUSE SYSTEM COMPONENT TUR ER TURER I I J I I I I I - I I I I I I I I I I I I I  !:!=*:::::::!:*::::i::*:::!:!:!:*::::=:::!::.'!:!::::. I I I .I I I I SUPPLEMENTAL REPORT EXPECTED (14) MONTH .DAV VEAR EXPECTED

. .' . SUBMISSION n k--i DATE (151 YES (If yes; comp.l*t* EXPECTED SUBMISSION DATE) NO I I I ABSTRACT (Limit to 1400 spaces, i.tJ., apprqximtJtely fiftetJn single-space t~pe~r(tttJn li'!es) '16)

On January 4, 19.92, at 2143 hours0.0248 days <br />0.595 hours <br />0.00354 weeks <br />8.154115e-4 months <br />, 2A Vital Bus tripped during a transfer of the bus from 22 Station Pow~r Tr~n~former (SPT) to 21 SPT. The 21 SPT infeed breaker (21ASD).did riot close resulting in an automatic start and blackout loading of 2A Diesel Generator (D/G).

The automatic start and loadl.ng of the D/G is an Engineered Safety Feature . (ESF). The cause of the 2A Vital :aus trip is equipment failure. A ~artrid~e fuse in ihe 21 SPT potential tran~former secondary, that supplies power to the meteritig circuit, had failed~

A review was conducted of other fuse concerns (in similar systems)~

Additional similar failures of this type.fuse.were not identified.

This event is considered to be *an isolated occurrence. -The 2A 4KV Vital Bus was reconnected to No. 22 SPT at 2225 hours0.0258 days <br />0.618 hours <br />0.00368 weeks <br />8.466125e-4 months <br /> on January 4; 1992. The failed fuse was replaced.

NRC Farm 366 (6-89).

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. . LICENSEE EVENT REPORT (LER) TEXT* CONTINUATION Salem Generating.Station *DOCKET NUMBER. LER NUMBER PAGE

µ_n_i_* _t_.*=2-*---------------=-5~000311 ---~~ 92-001-00

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2 of 3.

PLANT AND SYSTEM IDENTIFI.CATION: .

. Westinghouse - Pressuri~ed Water R~actor Energy Industry Identification System (EIIS) codes are ide~tified in

.the text as (xx I IDENTIFICATION OF OCCURRENCE:

Engineered Safety Feature Signal Actuation: 2A 4KV Vital Bus .

tJndervoltage Event Date~ 01/04/92 Report Date: 01/30/92 This report was initiated by Incident Report No.92-008.

CONDITIONS PRIOR TO OCCURRENCE:

01/04/92: 6th Refueling in progress; geactor defueled DESCRIPTION OF OCCURRENCE:

On January 4i 1992~ at 2143 hours0.0248 days <br />0.595 hours <br />0.00354 weeks <br />8.154115e-4 months <br />, 2A Vital Bus {EBI tripped during*a transfer of the bus from 22 Station Power Transforiner (SP'i'} to 21*

SPT~. The 21 SPT infeed breaker (21ASD) did not close resulting in an automatic start and blackout loading of 2A Diesel Generator (D/G}

[EKI. The automatic start and loading of the.DIG.is an Engineered Safety Feature (ESF).

On January 4, 1992 at 2320 hours0.0269 days <br />0.644 hours <br />0.00384 weeks <br />8.8276e-4 months <br />, in accordance with Code of Federal Regulations 10CFR 50.72(b} (2) (ii), the Nuclear- Regulatory Commission (NRc)*was notified of the inadvertent start of 2A D/G.

APPARENT CAUSE OF OCCURRENCE:

The cause of the 2A Vital Bus trip is equipment failure. A cartridge fuse in the 21 SPT potential transformer secondary, that supplies po_wer to the* metering circuit, had failed.

A review was conducted of other fuse concerns (in simi.lar systems) .

Additional similar failures of this type fuse were not identified.

This: event .is considered to be an isolated occurrence. .

ANALYSIS OF OCCURRENCE:

The 4KV Vital Busses provide load to various vital (lE) equipment *.

The 2A 4KV Vital Bus specifically provides load to the 2A 460 VAC

. Vital Bus, the 2A 230.VAC Vital Bus and the following safety related pu~ps:

LICENSEE EVENT. REPORT (LER) TEXT CONTINUATION ..

Salem Generating.Station DOCKET NUMBER LER NUMBER .PAGE.

u__n_i_t_2_ _ _ _ _---'------------"50_Q_Q_31J.=-------'9~2=---'Q~O 1-0_Q_ J of J ANALYSIS OF. OCCURRENCE: (cont'd*)

No. 21 Motor Driven Alixiliary Feedwater (MDAFW).PU:mp {BAI No.

  • Per design, the 2A.D/G started, connected.to the 2A Vital Bus.and loaded the bus (as applicable).* All equipment functioned as designed. As ideritified previously, the reactor was defueled;
  • therefore, this event did not affect the health or .safety of the public.

However, due to.the automatic actuation . signal.of an ESF system, this.event. is reportable in accordance with Code of Federal Regulations 10CFR 50.73(a) (2) (iv).

CORRECTIVE ACTION:

The 2A 4KV Vital Bus .was reconnected to No. 22 SPT at. 2225 hours0.0258 days <br />0.618 hours <br />0.00368 weeks <br />8.466125e-4 months <br /> on January .4, 1992.

The failed fuse was replaced.

A review.was conducted to determine if recurring fuse failur~s was of concern. It was determined that this frise failure is an isolated event.

General Manager ~

Salem Operations bwl:pc SORC Mtg.92-010

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