ML17341B014

Forwards Request for Addl Info Re Adequacy of Electrical Distribution Sys Voltages.Response Required within 45 Days

ML17341B014
Person / Time
Site:	Turkey Point
Issue date:	03/19/1982
From:	Varga S Office of Nuclear Reactor Regulation
To:	Robert E. Uhrig FLORIDA POWER & LIGHT CO.
References
NUDOCS 8204120064
Download: ML17341B014 (6)

Text

MAR 18 198K Docket Nos. 50-250 and 50-251 Dr. Robert E. Uhrig, Vice President Advanced Systems and Technology Florida Power and Light Company Post Office Box 529100 Hiami. Florida 33152

Dear Dr. Uhrig:

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'v DISTRI8UTION Dockets NRC PDR L PDR NSIC ORBPl Rdg DEisenhut OELD IE CRS-10 p Parrish-MGrotenhuis AEOD MSrinivansan RPrevatte Gray File We have completed our preliminary Review of your submittals dated August 8,

1979, Decenber 18, 1980, June 10, 1981 and February 24, 1982 regarding the adequacy of station electrical distribution system voltages for the Turkey Point Plant, Unit Nos.

3 and 4.

In order to complete our review the additional information identified in the enclosure to this letter is necessary.

Please provide the information within 45 days from the receipt of this letter.

Sincerely,

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Rpga Steven A. Varga, Chief Operating Reactors Branch 3WI'1 Division of Licensing

Enclosure:

Request for Additional Information cc w/enclosure:

See next page

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Robert E. Uhrig Florida Power and Light Company cc:

Mr. Robert Lowenstein, Esquire Lowenstein, Newman, Reis and Axelrad 1025 Connecticut Avenue, N.W.

Suite 1214 Washington, D. C.

20036 Environmental and Urban Affairs Library Florida International University Miami, Florida 33199 Mr. Norman A. Coll, Esquire

Steel, Hector and, Davis 1400 Southeast First National Bank Building Miami, Florida 33131 Mr. Henry Yaeger, Plant Manager Turkey Point Plant Florida Power and Light Company P. 0. Box 013100 Miami, Florida 33101 Mr. Jack Shreve Office of the Public Counsel Room 4, Holland Building Tallahassee, Florida 32304 Administrator Department of Environmental Regulation Power Plant Siting Section State of Florida 2600 Blair Stone Road Tallahassee, Florida 32301 Resident Inspector Turkey Point Nuclear Generating Station U. S. Nuclear Regulatory Commission Post Office Box 1207 Homestead, Florida 33030 James P. O'Reilly Regional Administrator - Region II U. S. Nuclear Regulatory Commission 101 Marietta Street - Suite 3100 Atlanta, Georgia 30303

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RE UEST FOR ADDITIONAL INFORMATION TURKEY POINT UNITS 3 AND 4 ADE UACY OF STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES Ref.

Ref.

Ref.

Ref.

1:

FPL letter (R. Uhrig) to NRC (S. Varga), dated December 18, 1980.

2:

FPL letter (R. Uhrig) to NRC (S. Varga), dated June 10, 1981.

3:

FPL letter (R. Uhrig) to NRC (S. Varga), dated February 24, 1982.

4:

NRC letter (W. Gammill) to all power reactor licensees, dated August 8, 1979.

2.

3.

4.

The analysis results and documentation submitted in Reference 1 and 2

demonstrate that the Class lE motors will successfully start within the minimum starting voltage and that the +10K design voltage rating is not exceeded.

However, the results do not verify that the steady state voltage at the terminals of the Class 1E equipment is within;the -10K design voltage rating.

Therefore, submit the "worst case" steady state load terminal voltage at all Class 1E voltage distribution levels.

What is the duration of the starting transient when starting the steam generator feedwater pump (Cases 2 and 13 of Ref. 1)7 Discussion - This duration time with respect to the transient voltage h<<h<<h 111 1

1 1

h undervoltage relays during the load starting.

Submit details of the test verification performed (i.e., plant operating

mode, bus loading percentages, distribution level voltages, etc.)

and verify that the "less than 3X'orrelation difference [Ref. lj is applicable to both steady state and transient conditions.

The scope of the,voltage analyses to be submitted as outlined in Ref.

4 applies to all available offsite source connections to the onsite distri-bution system.

For the available source connections as defined in Ref. 3, an analysts was submitted only for the units'edicated startup transformer connection.

Since backfeeding through the main transformer and unit auxiliary transformer and the use of the adjacent unit's startup transformer are viable source connections for each unit, a worst case voltage analysis (undervoltage and overvoltage) is required.

Discussion - If documentation can be provided to verify that due to transformer impedances, bus loading conditions and configurations, etc.,

(following the guidelines in Ref. 4) that the voltage drops experienced (both steady state and transient) do not exceed those already submitted, then the analysis results of these viable source connections need not be submitted.

However, documentation should be provided to verify that these source connections were analyzed and that each have the capacity and capability to supply adequate voltage to the Class lE equipment within the design, voltage ratings under worst case conditions.

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