ML17341B505

Forwards Info Re Adequacy of Station Electric Distribution Voltages,In Response to 821022 Telcon Request.No Single Failure Can Affect Both Circuits Simultaneously or Consequentially Such That Both Required Circuits Lost

ML17341B505
Person / Time
Site:	Turkey Point
Issue date:	11/16/1982
From:	Robert E. Uhrig FLORIDA POWER & LIGHT CO.
To:	Varga S Office of Nuclear Reactor Regulation
References
L-82-509, NUDOCS 8211220119
Download: ML17341B505 (6)

Text

'REGULATORY I RMATION DISTRIBUTION SYST (RIDS)

ACGBSSIQN NBR;8211220119 DOC ~ DATE: 82/11/16 NOTARIZED; NO DOCKET FACIL:50-250 Turkey Point Plant~ Unit 3i Florida ."Power and Light C 05000250 50 251 Turkey Point Planti Unit 4~ Flor ida 'Power and Light C 05000251 AUTHINAME AUTHOR AFFII IATION UHRIGg R ~ E, Florida Power L .Light Co, REC Ip, NAME RECIPIENT AFFILIATION VARGAeS ~ AD Operating Reactors Branch

SUBJECT:

Forwai ds info re adequacy of station elec,tric dis.tribution voltages in .response to 821022 telcon .requests No single failure can -affect both circuits simultaneousl:y or consequential'ly such that both required circui:ts CODE: A015S .COPIES RECEIVED:LTR .ENCL lSIZE:

lost'ISTRIBUTION 1

TITLE: OR Submittal': Onsite Emer gency power System NOTES:

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P. X I4000, JUNO BEACH, FL 33408 FLORIDA POWER & LIGHT COMPANY November 16, 1982 L-82-509 Office of Nuclear Reactor Regulation

.Attention: Mr. S. A. Varga, Chief Operating Reactors Branch 51 Division of Operating Reactors.

U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Dear Mr. Varga:

Turkey Point Units 3 & 4 Docket Nos, 50-250 and 50-251 Adequacy of Station Electric Distribution S stem Volta es As. requested in a telephone conversation with members of the NRC staff on October 22, 1982, we have prepared a discussion of General Design Criteria 17 as it applies to Turkey Point Units 3 a 4. This discussion is attached.

Should you or your staff have any additional questions on this subject, please contact us.

Very truly yours, o e t E. Uhrig Vice President Advanced Systems 6 Technology REU/PLP/js cc: Mr. J. P. O'Reilly, Region II Harold F. Reis, Esquire o)>

P'DR 8211220119 821116 PDR'DOCK 05000250 PEOPLE... SERVING PEOPLE

• l Re: Turkey Point Units 3 6 4 Docket No. 50-250, '50-251 Adequacy of Station El'ectric Distribution S stem Volta es Response to NRC statement on A'dequacy of Station'Electric Di;stribution System Voltage: GDC17 received in .telephone conversation October 22, 1982.

'RC 'STATEHENT:

"The licensee is required to provide the'esults of a review to determine if any single event. or condition. exists in the PTP plant electrical system which could result in the simultaneous or consequential loss of both required offsite power circuits to the onsite distribution system and thus violating the requirements of GDC17."

FPL RESPONSE:

The.onsite electrical-'distribution system for each unit is supplied by two separate and independent offsite sources. One required circuit for each unit is supplied via the unit's:start-up transformer. The other required circuit is supplied by the adjacent unit's start-up transformer., Each start-up transformer is connected by. separate, independent highlines to separate busses in the,switchyard. Each transformer is connected'o the unit's onsite..distribution system via separate cables and breakers. No single failure can affect both circuits simultaneously or consequentially such that both.

required circuits are .lost. Thus the requirements of GDC17 are met.

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