ML19327B093

Requests Discretionary Enforcement of Tech Spec 3.8.3.1 to Allow Continued Operation of Facility in Mode 3 for 72 H Beyond Expiration of Initial Action Statement

ML19327B093
Person / Time
Site:	South Texas
Issue date:	10/12/1989
From:	Chewning R HOUSTON LIGHTING & POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
ST-HL-AE-3261, NUDOCS 8910250181
Download: ML19327B093 (3)

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October 12, 1989 7

ST HL AE 3261 File No.: C09.06, C20.02 l 10CTR50 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 South Texas Project Electric Cenerating Station Unit 1 Request for Discretionary Enforcement of Technical Soecification 3. 8. 3 1 At 1533 hours0.0177 days <br />0.426 hours <br />0.00253 weeks <br />5.833065e-4 months <br /> on October 11, with the plant in Mode 3, H1AP declared the 25KVA inverter / rectifier 3E241EIV002 out of service because of a failed circuit board. Technical Specification 3.8.3 lg requires that the 120 Volt AC Vital Distribution Panel DP002 be energized from this inverter. The plant consequently entered ACTION statement b. The AC vital distribution panel was reenergized as required in ACTION b(1). However. H1AP does not expect to be able to reenergize the panel from its associated inverter in the 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> as required in ACTION b(2).

HLAP requests discretionary enforcement to allow continued operation of STP Unit 1 in Mode 3 for an additional 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> beyond the expiration of the initial ACTION statement, i.e., until 1533 hours0.0177 days <br />0.426 hours <br />0.00253 weeks <br />5.833065e-4 months <br />, October 15, 1989.

The justification for this request is as follows:

The regulating transformer being used to supply Vital 120 VAC Distribution Panel 3E241EDP002 (Channel IV) is powered from Class IE 480V Motor Control Center (MCC) E1C2. The source of on site power for this MCC is Standby Diesel Generator (SDG) 13 (Train C). Use of the regulating transformer as the supply for panel EDP002 for this time does not affect General Design Criterion 17 considerations, does not cause loss of any required loads, does not affect SDG reliability, and does not affect other safety related trains. The events which would cause loss of power to panel EDP002 are a loss of offsite power coincident with SDG 13 failure to start.

The probability of these events occurring over the brief extension of time being requested is very small. Even in this unlikely scenario, the plant can be brought to cold shutdown without power to panel DP002. In addition, decay ,

. heat is minimal since the plant has been shutdown for refueling since early '

l- August.

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, Regional Administrator, Region IV Rufos S. Scott h Nuclear Regulatory Commission Associate General Councel l 611 Ryan Plaza Drive, Suite 1000 Houston Lighting & Power Company ,

Arlington, TX 76011 P. O. Box 1700  ;

Houston, TX 77001 Coorke Dick, Project Manager l U. S. Nuclear Regulatory Commission INPO [

Washington, DC 20555 Records Center l 1100 circle 75 Parkway {

Jack E. Bess Atlanta, CA 30339-3064 i Senior Resident inspector Unir 1 ,

c/o U. S. Nuclear Regulatory Commission Dr. Joseph M. ;tendrie  !

P. 0.. Box 910 50 Be11 port Lane i Bay City, TX 77414 Be11 port, NY 11713  ;

J. 1. Tapia D. K. Lacker i Senior Resident inspector . Unit 2 Bureau of Radiation Control  !

c/o U. S. Nuclear Regulatory Commission Texas Department of Health  !

P. O. Box 910 1100 West 49th Street .;

Bay City, TX 77414 Austin, TX 78756 3189 j

'J. R. Newman, Esquire j Newman & Holtzinger, P. C. i 1615 L Street, N. W. t Washington, DC 20036 i t

R. L. Range /R. P. Verret  !

Central Power h Light Company (

P. O. Box 2121 '!

Corpus Christi, TX 78403  !

R. John Miner (2 Copies)  !

Chief Operating Officer l City of Austin Electric Utility i 721 Barton Springs Road i Austin, TX 78704 i R. J. Costello/M T. Hardt ,

City Public Service Board i P. O. Box 1771 j San Antonio, TX 78296  ;

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