ML18153C977

LER 92-004-00:on 920318,EDG 3 Automatically Started Upon Receipt of Unit 1 Volt Emergency Bus Undervoltage Signal. Caused by Personnel Error.Human Performance Enhancement Sys Evaluation Being conducted.W/920413 Ltr

ML18153C977
Person / Time
Site:	Surry
Issue date:	04/13/1992
From:	Kansler M VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
92-276, LER-92-004-03, LER-92-4-3, NUDOCS 9204240204
Download: ML18153C977 (4)

Text

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'I Virginia Electric and Power Company Surry Power Station P. 0. Box 315 _

Surry, Virginia 23883 April 13, 1992 U. S. Nuclear Regulatory Commission Serial No.: 92-276 Document Control Desk SPS:BCB Washington, D. C. 20555 Docket Nos.: 50-280 50-281 License Nos.:* DPR-32.

DPR-37 Gentlemen:

Pursuant to Surry Power Station Technical Specifications, Virginia Electric and Power Company hereby submits the following Licensee Event Report for Units 1 and 2.

BEPQRTNUMBER 50-280/92-004-00.

This report has been reviewed by the Station Nuclear Safety and Operating Committee and will be reviewed by the Corporate Management Safety Review Committee.

Very truly yours, Enclosure cc: Regional Administrator Suite2900 101 Marietta Street, NW Atlanta, Georgia 30323

,: -* ...~'. *~* ~. ~

'* .,_ 9;io42402oce 920413 05000280 PDR ADO"' PDR s

NRC FORM 366 U.S. NUCLEAR REGULATORY. COMMISSION (6-89) APPROVED 0MB NO. 3150-0104 EXPIRES: 4/30/92 ESTIMATED BURDEN PER RESPONSE TO COMPLY WTH THIS INFORMATION COLLECTION REQUEST: 50.0 HRS. FORWARD LICENSEE EVENT REPORT (LERI 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.

l FACILITY NAME (1) OOCKET NUMBER (2) I PAGE 131 Surry Power Station, Unit 1 . o 15 I o i o I o I 2 18 lo 1 joF O I 3 TITLE 141 4160 Volt Emergency Bus lJ Undervoltage Signal Caused By Personnel Error Results-in Automatic Start of Emergency Diesel Gener-ator Number 3 EVENT DATE 15)

• LER NUMBER 16) REPORT DATE (7) OTHER FACILITIES INVOLVED IB)

MONTH DAY YEAR YEAR :ft SE~~~~~~AL j) ~~X,~~~ MONTH DAY YEAR FACILITY NAMES DOCKET NUMBER(Sl Surry Unit 2 o I 5 Io Io I o 12 1 81 oI3 1 -I s 9 2 9 I 2 - olo I 4 - o Io o I 4 1 13 9 2 I OPERATING THIS REPORT IS SUBMITTED PUR~UANT TO THE RlaQUIREMENTS OF 10 CFR §: (CMck on* or mar* of the following/ 111)

_ _M_o_D_E-le_,_

I

__._N--l---1 20 _4021 b 1

- 20.40&(c)

-X &0,73la)(2)(iv)

- 73.71(b)

POWER LEVEL 20.4051*111)(i)

- &0.38(c)(1)

- &0.73(a)(2)(v)

- 73.71 (c) f'\ -

I I'-' &0.38(c)(2) &0.73la)(2)(vii) OTHER (S~cify 'in Abstract 1101 . 20.4051011110n

- - below *nd in Text, NRC Form 20.406(0)11 )(jii)

- 60.73(*112)(11 '&0.73(a)(2)(viii)(A) 366A}

20.405(*)(1 )(jy) 20.405(*) (1 )(v)

- &0.73la)(2)(il)

&0.73(a)(2)(iii)

- &0.731a)l2)(vliillB)

&0.73(a)(2)(x)

LICENSEE CONTACT FOR THIS. LER (12)

NAME TELEPHONE NUMBER M. R. Kansler, Station Manager AREA CODE COMPLETE ONE LINE FOR EACH COMPONENT FAILURE DESCRIBED IN THIS REPORT (13)

MANUFAC- MANUFAC-CAUSE SYSTEM COMPONENT TURER TURER 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 I I SUPPLEMENTAL REPORT EXPECTED (14) MONTH' DAY YEAR EXPECTED

~

SUBMISSION*

DATE (15) j YES (Uy*s. complete EXPECTED SUBMISSION DATE/ NO I I I ABSTRACT (Limit to 1400 spaces, i.e., approximBtt1/y fifte6n sing/e-spact1 typt1written /inesj (16)

On March 18, 1992, at 1356 hours0.0157 days <br />0.377 hours <br />0.00224 weeks <br />5.15958e-4 months <br />, with Unit 1 at refueling shutdown and Unit 2 at 100% power, Emergency Diesel Generator Number 3 (EDG 3) automatically started upon receipt of a Unit 1 4160 volt emergency bus 1J undervoltage (UV) signal. Th~ UV signal also caused annunciator K-H-3, "BUS 1J UNDER VOLT", to alarm in the control room. The control room responded by checking the emergency bus 1J voltage and determined that the _voltage was normal. EDG 3 was also verified to be operating properly. An assistant shift supervisor was dispatched to the emergency bus 1J UV relay panel to investigate the cause of the UV signal. The assistant shift supervisor discovered that contract electricians were working in the subject panel and determined, based on this observation and the absence of other indications of an actual UV condition, that an UV relay had been bumped, resulting in the UV signal. EDG 3 was secured and placed in "Auto" at 1428 hours0.0165 days <br />0.397 hours <br />0.00236 weeks <br />5.43354e-4 months <br />.* This event was caused by a personnel error in that a contract electrician inadvertently bumped an emergency bus 1J UV relay while working in the emergency bus 1J UV relay panel. A Human Performance Enhancement Syst~m evaluation is being conducted to determine how this event may have been prevented. This event is being reported, pursuant to 10 CFR 50.73(a)(2)(iv)',

as an unplanned Engineered Safety Feature (ESF) actuation.

NRC Form 366 (6-89)

NRC FORM 366A (6-89)

LICENSEE EVENT REPORT (LER) .

U.S. NUCLEAR REGULATORY COMMISSION e APPROVED 0MB NO. 3150-0104 EXPIRES: 4/30/92 ESTIMATED BURDEN PER RESPONSE TO COMPLY WTH THIS INFORMATION COLLECTION REQUEST: 50.0 HRS. FORWARD COMMENTS REGARDING BURDEN ESTIMATE TO THE RECORDS TEXT CONTINUATION 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 121 LER. N,UMBER 161 PAGE (31 YEAR  :::::::::: SEQUENTIAL ::::::::::* REVISION

NUMBER  :!:::::::: NUMBER Surry Power Station, Unit 1 TEXT (If mor. &pat>> ia raquitH, ,,_ Mlditional NRC Fann .BA 'al (171 0 15 IO IO IO 12 I ~IO -91 2 - 0 IO I 4 - o, 0 0 I 2 OF O13

1.0 DESCRIPTION

OF THE EVENT On March 18, 1992, at 1356 hours0.0157 days <br />0.377 hours <br />0.00224 weeks <br />5.15958e-4 months <br />, with Unit 1 at refueling shutdown and Unit 2 at 100% power, Emergency Diesel Generator Number 3 (EDG 3) {EIIS-EK,DG}

automatically started upon receipt of a Unit 1 4160 volt emergency bus {EIIS-EB,BU} 1J undervoltage (UV) signal.

The UV signal also caused annunciator {EIIS-IB,ANN} K-H-3, "BUS 1J UNDER VOLT", to alarm in the control room. The control room responded by checking the emergency bus 1J voltage and Qetermined that the voltage was normal.

• An assistant shift supervisor was dispatched to the emergency bus _1 J UV relay panel

{EIIS-JE,PL} to investigate the cause of the UV signal. The assistant shift supervisor discovered that contract electricians were working in the subject panel* and determined, based on this observation and the absence of other indications of. an actual UV condition, -that an UV relay {EIIS-JE,27} had been bumped, resulting in the UV signal.

EOG 3 reached the required nominal speed of 900 RPM, as designed, but did not load on emergency buses 1J or 2J since an actual UV condition _did not exist. EOG 3 was secured and placed in "Auto" at 1428. hours ..

A non-emergency four~hour report, pursuant to 1o CFR 50.?2(b)(2)(ii), was*

made to the Nuclear Regulatory Commission at 1647 hours0.0191 days <br />0.458 hours <br />0.00272 weeks <br />6.266835e-4 months <br /> on March 18, 1992..

This event is being reported, pursuant to 1o CFR 50.73(a)(2)(iv), as an unplanned Engineered Safety Feature (ESF) actuation.

2.0 SIGNIFICANT SAFETY CONSEQUENCES AND IMPLICATIONS This event resulted in no negative safety consequences or implications since an

.actual emergency bus UV condition *did not exist. In addition, EOG 3 automatically started, as designed, and would have provided power to the appropriate buses in the event of a valid UV condition. Therefore, the health and safety of the public were not affect~d by this event.

3.0 CAUSE OF THE EVENT This ESF actuation resulted from an inadvertent emergency bus 1J UV signal which was caused by a personnel error. Upon investigation, it was concluded that the UV signal was initiated when a contract electrician inadvertently bumped an emergency bus 1J UV relay while performing unrelated work in the emergency bus 1J UV relay panel.

4. 0 IMMEDIATE CORRECTIVE ACTIONCSl The control room responded by checking the emergency bus 1J voltage and determined that the voltage was normal. EDG 3 was also verified to be operating properly. An assistant shift supervisor was dispatched to. the el""'ergency bus 1J UV relay panel to investigate the cause of the UV signal.

NRC Form 366A 16-891

NRC FORM 366A (6-89)

LICENSEE EVENT REPORT ILER)

- U.S. NUCLEAR REGULATORY COMMISSION e APPROVED 0MB NO. 3150-0104 EXPIRES: 4/30/92 ESTIMATED ~URDEN PER RESPONSE TO COMPLY WTH THIS INFORMATIO!'< COLLECTION REQUEST: 50.0 HRS. FORWARD COMMENTS REGARDING BURDEN ESTIMATE TO THE RECORDS TEXT CONTl~UATION AND REPORTS MANAGEMENT BRANCH (P-530), U.S. NUCLEAR REGULATORY COMMISSION, WASHINGTON, DC 20555, AND TO THE PAPERWORK REDUCTION PROJECT 13150-0104), OFFICE OF MANAGEMENT-AND BUDGET,.WASHINGTON, DC 20503.

FACILITY NAME 11) OOCKET NUMBER 12) LER NUMBER (6) PAGE 13)

Surry Power Station, Unit 1 o 1s Io Io Io 12 I s1. o 9 I 2 __ 01 oI 4 _ o I o o 13 oF o 13 TEXT (ff mom space i8_,wquiml, ulltJ *dditional NRC Form 366A'&/ 117) s .o ADDITIONAL CORRECTIVE ACTION(S)

Control_ Operations personnel investigated the cause of the UV signal and determined that no UV or degraded voltage condition was present on emergency bus 1J that would require an automatic start of EDG 3.

• EDG 3 was secured and placed in "Auto" at 1428 hours0.0165 days <br />0.397 hours <br />0.00236 weeks <br />5.43354e-4 months <br /> on March 18, 1992.

6: o ACTIONS TO PREVENT RECURRENCE A Human Performance Enhancement System (HPES} evaluation is being conducted to determine how this event may have been prevented. Recommendations

.r~sulting from _this evaluation will be implemented, as appropriate.

7.0 SIMILAR EVENTS LER 81-90-004-00: Unit 1 Reactor Trip/Turbine Trip Due Tc, Deluge Actuation On The "A" Main Transformer And Unit 2

• Manual Reactor Trip Due To Erratic IRPI Indications

8. 0 MANUFACTURER/MODEL NUMBER

- N/A NRC Form 366A 16-89)