ML18152A605

LER 87-027-00:on 871027,electrical Short in Train a Turbine Bldg Flood Control Panel Caused Spurious Completion of Flood Protection Circuit.Caused by Leak on Access Manway of Moisture Separator Reheater 1-MS-E-1B.W/871125 Ltr

ML18152A605
Person / Time
Site:	Surry
Issue date:	11/25/1987
From:	Benson D VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
87-033, 87-33, LER-87-027, LER-87-27, NUDOCS 8711300057
Download: ML18152A605 (4)

Text

POW 28-06-01 NRC Form 31141 U.S. NUCLEAR REGULATORY COMMISSION 19-831 APPROVED 0MB NO. 3150-0llM LICENSEE EVENT REPORT ILER) EXPIRES: 8/31/88 FACILITY NAME 111 DOCKET NUMBER (21 I PAGE 131 SURRY POWER STATION, UNIT 1 TITLE l4r

!o Is I o to I o 12 I 81 0 1 loF O 13 Spurious Engineered Safety Feature Actuation Due To Water Intrusion Into Control Panel EVENT DATE 151 LER NUMBER 161 REPORT DATE 171 OTHER FACILITIES INVOLVED 181 MONTH DAY YEAR YEAR r.:::::::;: SEQUENTIAL ::":*::: REVISION MONTH DAY YEAR FACILITY NAMES DOCKET NUMBERISI I:'.:::'.?'. NUMBER  :::::::::* NUMBER 1 I o 217 s 1 s 11 - o I 211 - 01 o 1 11 21 s s 1 1

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LI_CENSEE CONTACT FOR THIS LER 1121 NAME TELEPHONE NUMBER AREA CODE David L. Benson, Station Manager COMPLETE ONE LINE FOR EACH COMPONENT FAILURE DESCRIBED IN THIS REPORT 1131 CAUSE SYSTEM COMPONENT MANUFAC-TURER REPORTABLE }:

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SUPPLEMENTAL REPORT EXPECTED 1141 MONTH DAV VEAR EXPECTED h YES /If y,s: compf,r, EXPECTED SUBMISSION DATE/ rxi NO SUBMISSION DATE 115!

I I I On October 27, 1987, Unit 1 was operating at 100% power. At 1657 hours0.0192 days <br />0.46 hours <br />0.00274 weeks <br />6.304885e-4 months <br />, an electrical short in the Train "A" Turbine Building flood control (EIIS-VK) panel (TBFT-A) caused a spurious completion of the flood protection circuit. This caused two of the four condenser circulating water inlet valves, MOV-CW-106A and C (EIIS-BS-V), to begin automatically closing as designed. Operations personnel, re-sponding to a decreasing condenser vacuum, identified the affected valves, verified their actuation was spurious, and fully opened them. A leak had developed on an access manway of Moisture Sepa-rator Reheater (EIIS-MSR) 1-MS-E-lB. Water drained from this leak onto the train "A" flood control panel housing and caused the short in the flood protection circuit.

The flood panel and its wiring were dried, the short was cleared and the flood control system was returned to normal status. The access manway leak on the MSR has been repaired._

8711300057 871125 PDR ADOCK 05000280 S PDR NRC Form 388 19 831

POW 28-06-01 NRC Form JIMA U.I. NUCLEAR IIEOULATOIIY COMMIIIION 19-Ui LICENSEE EVENT REPORT (LER) TEXT CONTINUATION APPROVED 0MB NO. 3150-0104

• EXPIRES: 8/31 /Ill FACILITY NAME 11) . DOCKET NUMIIEA 121 LER NUMBER 111 l'AOE 131 SURRY POWER STATION, UNIT 1 o 1s 1*o Io I 0.1 218 1o s 1 7 - 01211 - o I o O I 2 oF o I 3 TEXT /If mo,a ~ ii ,.quitWI, 11* MkllrioMI NRC Fonn _.. 'al 1171 1.0 Description of the Event On October 27, 1987, .Unit 1 was operating at 100% power. At 1657 hours0.0192 days <br />0.46 hours <br />0.00274 weeks <br />6.304885e-4 months <br />, an electrical short in the Train "A" Turbine Building flood control (EIIS-VK) panel (TBFT-A) caused a spurious completion of the flood protection circuit. This caused two of the four conden-ser circulating water inlet valves, MOV-CW-106A and C (EIIS-:BS-V),

to begin automatically closing as designed. Operations personnel, responding to a decreasing condenser vacuum, identified the affected valves, verified their actuation was spurious, and fully-opened them.

2.0 Safety Consequences and Implications The condenser circulating water inlet valves are designed to close in order to maintain an 18 foot level in the intake canal to pre-serve the station heat sink during certain accident conditions.

They also close to prevent flooding in the Turbine Building and thus protect safety related equipment from possible malfunction.

The signal that completed the flood protection logic was caused by an electrical short, and the valves cycled in accordance with their design. Therefore, the health and safety of the public were not affected.

3.0 Cause A leak had developed on an access manway of Moisture Separator*

Reheater (EIIS-MSR) 1-MS-E-lB. Water drained from this leak on-to the train "A" flood control panel housing and caused the short in the flood protection circuit.

4.0 *Immediate Cor*rective Actions Operations personnel identified the affected valves (MOV-CW-106A and C), verified their actuation was spurious, placed them in the full open position and returned the unit to stable operation.

5.0 Additional Corrective Action*

The flood panel and its wiring were dried, the short was cleared and the flood control system was returned to normal status. The access manway leak on the MSR has been repaired.

6.0 Action Taken to Prevent Recurrence No further actions are considered necessary.

NRC FORM 368A

POW 28-06-01 NRC rorm 366A U.S. NUCLEAR REGULATORY COMMISSION (9-83!

LICEN_SEE EVENT REPORT (LERI TEXT CONTINUATION APPROVED 0MB NO. 3150-0104 EXPIRES: B/31/88

.J~~=~=--------------~----~~......--------.,..,..-----------------r--------1 FACILITY NAME (1) DOCKET NUMBER (2) LER NUMBER (6) PAGE (3)

SURRY POWER STATION, UNIT 1 o 1s Io Io Io I 2 18 Io 8 I 7 - ol 217 - o I o o I 3 OF oI3 TEXT (ff motw -ce i$ ,wquirrtd, u* *dditional NRC Form 356A 's/ (17) 7.0 Similar Events Unit 2 Licensee Event Report 87-005.

8.0 Manufacturer/Model Number Southwestern Engineering/File #8416 NFIC FORM 366A

e VIRGINIA ELECTRIC AND POWER COMPANY Surry Power Station P. 0. Box 316 Surry, Virginia 23883 November 25, 1987 U.S. Nuclear Regulatory Commission Serial No.: 87-033 Document Control Desk Docket No.: 50-280 016 Phillips Building Licensee No.: DPR-32 Washington, D.C. 20555 Gentlemen:

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

REPORT NUMBER 87-027-00 This report has been reviewed by the Station Nuclear Safety and* Operating Committee and will be reviewed by Safety Evaluation and Control.

Very truly yours, c:J/

i~~on/~

. !JI Station Manager Enclosure cc: Dr. J. Nelson Grace Regional Administrator Suite 2900 101 Marietta Street, NW Atlanta, Georgia 30323