05000395/LER-1982-007, Forwards LER 82-007/03L-0.Detailed Event Analysis Encl

Forwards LER 82-007/03L-0.Detailed Event Analysis Encl

ML20065R788
Person / Time
Site:	Summer
Issue date:	10/21/1982
From:	Dixon O SOUTH CAROLINA ELECTRIC & GAS CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20065R792	List: 05000395/LER-1982-007, Forwards LER 82-007/03L-0.Detailed Event Analysis Encl 05000395/LER-1982-007-03, /03L-0:on 820925,diesel Generator Bldg Preaction Sprinkler Sys Heat Detectors Failed to Actuate Sprinkler Valve.Caused by Degraded Circuit Card in Sprinkler Sys Control Cabinet.Card Replaced
References
NUDOCS 8210290335
Download: ML20065R788 (4)

LER-1982-007, Forwards LER 82-007/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3951982007R00 - NRC Website

text

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.90UTH CAROLINA ELECTRIC & GAS COMPANY post orrict 7s4 COLuualA. SOUTH CAROLINA 29218 O.W.OlXON,JR.

VICE PRESrDENT October 21, 1982 NUCLE AR OpenarioNS [b

I, d Mr. James P.

O'Reilly, Director 3 G',

U.S. Nuclear Regulatory Commission Region II, Suite 3100 t

101 Marietta Street, N.W.

"cn Atlanta, Georgia 30303 jn

Subject:

Virgil C. Summer Nuclear Statio$

~

2 Docket No. 50/395 Operating License No. NPF-12 Thirty Day Written Report LER 82-007

Dear Mr. O'Reilly:

Please find attached Licensee Event Report #82-007 for Virgil C. Summer Nuclear Station.

This Thirty Day Report is required by Technical Specification 6.9.1.13(b) as a result of entry into Action Statement A of Technical Specification 3 7.9.2(d), " Spray and/or Sprinkler Systems," on September 25, 1982.

Should there be any questions, please call us at your convenience.

Very truly yours, O. W. Dixon, Jr.

ARK:0WD:dwr Attachment cc:

See Page Two

,,, ;.,e t.g. COP 3 8210290335 821021

/[ AM PDR ADOCK 0500039S S

PDR

n-Mr. James P. O'Reilly LER 82-007 Page Two October 21, 1982 cc:

V.C. Summer T.C. Nichols, Jr.

G.H. Fischer 0.W. Dixon, Jr.

H.N. Cyrus H.T. Babb D.A. Nauman M.B. Whitaker, Jr.

W.A. Williams, Jr.

0.S. Bradham R.B. Clary M.N. Browne A.R. Koon H. Radin Site QA C.L. Ligon (NSRC) 0.J. Braddick J.L. Skolds J.B. Knotts, Jr.

B.A. Bursey I&E (Washington)

Document Management Branch NPCF File i

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

Mr. James P. O'Reilly LER Ho.82-007 Page Three October 21, 1982 DETAILED DESCRIPTION OF EVENT On September 25, 1982, the routine Surveillance Test Procedure for the Diesel Generator Building Preaction Sprinkler System was being conducted to comply with Technical Specification 3.7.9.2.d.

During the performance of this test, the system heat detectors failed to actuate the sprinkler valve.

The system was repaired and restored to service.

On September 26, 1982, while investigating the probable causes of the previous day's event, the Diesel Generator Building Sprinkler Systen automatically actuated.

Subsequent inspection of the Diesel Generator Building disclosed that no fire or fire conditions existed.

PROBABLE CONSEQUENCES The failure of the heat detectors to operate the Diesel Generator Building Preaction Sprinkler System resulted in an inoperable automatic fire protection system.

Had a fire occurred in this area, it would have been necessary to manually actuate the sprinkler valve.

CAUSE OF THE OCCURRENCE Trouble shooting the control panel associated with the heat detectors and the sprinkler valve revealed that the circuit board was corroded and inoperative on the 25th.

It appeared that rainwater had entered the panel and actuated the valve on the 26th.

A penetration in the Turbine Building exterior wall (not a fire rated barrier) was not provided with a weather seal, thus allowing rainwater to enter.

The rainwater ran down the wall and into the system control panel.

It is the licensee's opinion that this entry path for water was the cause of the corrosion and failure of the circuit board as well as the subsequent activation.

e, i

4 Mr. James P. O'Reilly LER Ho.82-007 Page Four October 21, 1982 f

IMMEDIATE CORRECTIVE ACTION

'Upon failure of the heat detectors to actuate the sprinkler valve, immediate steps were taken to comply with the Action Statement of-Technical' Specification:3.7.9.2.d.

This involved posting - continuous fire watches and 1 backup-fire -suppression equipment in the.affected areas of the Diesel Generator Building.

The fire protection system was promptly repaired and retested.

ACTION TAKEN TO PREVENT RECURRENCE To prevent recurrence, the penetration in the Turbine Building wall will be provided with a weather seal.

A temporary cover has been installed over the sprinkler system control panel and

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the wall penetration.

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