ML20006E379

Safety Evaluation Accepting Request for Exemption from Emergency Lighting Requirements in Section Iii.J of App R to 10CFR50 to Provide Battery Powered Emergency Lighting Units in Control Room

ML20006E379
Person / Time
Site:	Oyster Creek
Issue date:	02/12/1990
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML20006E380	List: ML20006E379 ML20006E384
References
NUDOCS 9002230026
Download: ML20006E379 (2)

Text

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UNITED STATES j

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NUCLEAR REGULATORY COMMISSION

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WASHINGTON, D. C. 20565

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1 SAFETY LVALUATION BY THE OFFICE OF NUCLEAR, REACTOR REGULATION REQUEST FOR EXEMPTION ' ROM-BATTERY POWERED EMERGENCY LIGHTING UNITS IN THE CONTROL ROON GPU NUCLEAR CORPORATION.AND i

JERSEY CENTRAL POWER.& LIGHT COMPANY l

OYSTER CREEK NUCLEAR GENERATING STATION DOCKET NO. 50-219 i

1.0 INTRODUCTION

tsy letter dated November 24, 1986, the licensee, GPU Nuclear Corporation (GPUN/ licensee), requested an exemption from the requirement of Section III.J of Appendix R to 10 CFR Part 50 to provide individual battery powered emergency lighting units in the control room.

2.0 EXEMPTION REQUESTED f

The licensee has requested an exemption from the provision of Section III.J of Appendix R to 10 CFR Part 50 to the extent that the batteries which provide power to the emergency lights in the control room can be damaged by fire other than a fire in the control room.

l-3.0 EVALUATION Normal control room lighting is powered from a vital lighting bus. This bus

. receives power from normal offsite source and, by means of automatic transfer switch, to either Emergency Diesel Generator 1 or 2.

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' Emergency lighting for the control room is provided by a separate 12 volt system powered from 277 volt input,12 volt output battery / charger units.

The battery / charger units are located adjacent to the control room in the office building in fire area.0B-FA-9. These batteries are on constant trickle ch trge, su) ply power only to the control room emergency lights and will last longer t1an 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

These two lighting systems and their power supplies and wiring circuits are physically and electrically independent and separate from each other.

I Although a fire in Fire Area UB-FA-9 could damage the batteries which supply l'

power to the emergency lights, the two lighting systems are so located and l

arranged that a single fire could not threaten both at the same time.

We have reviewed the technical support provided by the licensee in their

~ letter of November 24, 1986, and agree with their presentation and conclusions.

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4.0 CONCLUSION

i Based upon the above evaluation. we conclude that the two separate lighting j

systems are adequate to assure continuous lighting in the control room for any fire postulated to occur in the plant. The. technical support for this conclusion is that each lighting system has its own power supply. In addition these'two power. supplies are independent of each other and physically separated so that a single fire will not damage both. Therefore i

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relocation of the existing batteries or battery / charger units or the instal-lation of individual battery powered emergency lighting units in the control room would not significantly enhance safety at Oyster Creek and this requested

. exemption should be granted.

Dated: February 12, 1990 Principal Contributor:

D. Notley e

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