ML18096A497

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
Issue date:	01/30/1992
From:	POLLACK M J, VONDRA C A Public Service Enterprise Group
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-92-001, LER-92-1, NUDOCS 9202050423
Download: ML18096A497 (4)

Text

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• ti*.* G 9 & . j>*' .. ---Public ServJce Electric and Gas P.O. Box 236 Hancocks Bridge, New Jersey 08038 Salem GeneratingStation . 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*

January 30, i992 This Licensee _Event Report is *being* submitted pursuant to the 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.

MJP:pc Distribution.

• Oft-:-n r-;' .* . . .. * ._,t:J \.i *:f. yours, C. A. Vondra General Manager -Salem Opera t.ions Thr' r:.,::,,r\1-\.

1 1.r,-...... ..... _ * . .. r \,,. .. : _\....' C-. 9202050423 920130 PDR

• ADOCK 0500031'1 '11 95-2189 (10M) 12-89 .S PDR NRC FORM 366 .

U.S. NUCLEAR REGULATORY COMMISSiON

.*. APPROVED OMB NO. 3150-0104 . . -LICENSEE EVENT REPORT (LER) *

• EXPIRES: 4/30/92 *

• _ E !MATED BURDEN PER RESPONSE TO COMP.LY WTH T-HIS INFORMATION COLLECTION REQUEST: 50.0 HRS. FORWARD 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 -o 1 5 1 o 1 o 1 o 1.3 11 1 1 r , 1 OF o 13 .TITLE (4) ESF Signal Ac_tuatiOn:

_ 2A. 4KV Vital Bus Undervoltage Due To 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 I 4 9 2 91 2 -ol 0I1 -0 lo. 0 I 1 3 r 0 9 12 OPERATING MODE (9) D THIS REPORT IS SUBMITTED.PURSUANT.TO THE OF 10 CFR .§:

ans or mar* of th* following)

(11). 20.402(b) 20.405(c) x 60.73(1)(2)(iv) 73.71(b.l i..;,,,;,,,..

20.405(1)(1)111 5o:3&(c)(1) 60,73(1)(2)(v) 13.111i:1 -t-50.3B(c)(2)

&0.73loH2Hviil OTHER (Spacify in Abstroct i---..:..

-t-b*low *nd in TttMt. NRC Form

• 20.405(o)(1 J(ilil . 50.73(1)(2)(0 6o.73(1)(2HvllllCAl 366AI* ,.._ -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 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 CAUSE SYSTEM COMPONENT I I J I I I I I TURER I I I I I I !:!=*:::::::!:*::::i::*:::!:!:!:*::::=:::!::.'!:!::::.

SUPPLEMENTAL REPORT EXPECTED (14) . . ' . . n YES (If yes; comp.l*t*

EXPECTED SUBMISSION DATE) k--i NO ABSTRACT (Limit to 1400 spaces, i.tJ., apprqximtJtely fiftetJn single-space li'!es) '16) I -I I I I I I . I MANUFAC**

TUR ER I I I I I I EXPECTED SUBMISSION DATE (151 MONTH .DAV VEAR I I I 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 (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 fuse in ihe 21 SPT potential secondary, that supplies power to the meteritig circuit, had A review was conducted of other fuse concerns (in similar 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).

. . *a LICENSEE EVENT REPORT (LER) TEXT* CONTINUATION Salem Generating.Station

• DOCKET NUMBER. LER NUMBER PAGE µ_n_i_* _t_.*=2-*

92-001-00 2 of 3.

PLANT AND SYSTEM IDENTIFI.CATION: . . Westinghouse

-

Water Energy Industry Identification System (EIIS) codes are in .the text as (xx I IDENTIFICATION OF OCCURRENCE:

Engineered Safety Feature Signal Actuation:

2A 4KV Vital Bus . tJndervoltage Event 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 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*

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 lOCFR 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

.. LICENSEE EVENT. REPORT (LER) TEXT CONTINUATION

.. Salem Generating.Station DOCKET NUMBER LER NUMBER u __ n_i_t_2 _____

1-0_Q_ ANALYSIS OF. OCCURRENCE: (cont'd*)

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

{BAI No. ** 21 containment Spray Pump {BE I No. 21 Safety Injection Pump {BQI No. 21 Service Water Pump {Bii *.No. 22 Service Water Plimp

• No. 21 Residual Heat Removal Pump {BPI No. 21 Component Cooling Pump {CCI * .PAGE. J of J 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 lOCFR 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 was of concern. It was determined that this frise failure is an isolated event. bwl:pc SORC Mtg.92-010 General Manager Salem Operations