ML17206A977

Requests Addl Info Re Degraded Grid Voltage within 45 Days of Ltr Receipt.Info Necessary to Complete Review

ML17206A977
Person / Time
Site:	Saint Lucie
Issue date:	07/23/1979
From:	Reid R Office of Nuclear Reactor Regulation
To:	Robert E. Uhrig FLORIDA POWER & LIGHT CO.
References
NUDOCS 7908200136
Download: ML17206A977 (6)

Text

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'NRC PDR TERA L

PDR Gray File R8 ORBb4 gdg ACRS (16) receipt of this letter.

Sincerely, Original signed by Robert W. Reid Robert HR Reid, Chief Operating Reactors Branch 84 Division of Operating Reactors

Enclosure:

Request for Additional Information cc w/enclosure:

See ne'xt page

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'Vollmer WRussell-TJCarter

. BGrimes Dr. Robert E. Uhrig

'Gammill Vice President LShao Florida Power 5 Light Company. 'Niller Advanced Systems 8 Technology.

RReid-P. 0. Box 529100 PErickson t?liami, Florida

33152, RIngram IRKH OELD

Dear Dr. Uhrig:

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II We ha've reviewed your submittals on degraded gr id voltage for,St. Lucie Unit 1.

'In order that we may complete our review,, please provide the additional information as indicated in the enclosure within 45 days of 799880< isa O RECIT OVRIIAMCW PATS~

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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, O. C. 20555 July 23, 1979 Docket No. 50-335 Dr. Robert E. Uhrig Vice President Florida Power 8 Light Company Advanced Systems 8 Technology P. 0.

Box 529100 thiami, Florida 33152 Deai Dr.'hrig:

We have reviewed your submittals on degraded grid voltage for St. Lucie Unit l.

In order that we may complete our review, please provide the V

additional information as indicated in the, enclosure within 45 days of receipt of this letter.

Sincerely,

Enclosure:

Request for Additional Information Robert W. Reid, Chief Operating.Reactors Branch P4 Division of Operating Reactors cc w/enclosure:

See next page

'Florida Power 8

'ght Company CC:

Robert Lowenstein, Esquire Lowenstein, Newman, Reis 5 Axelrad 1025 Connecticut

Avenue, N.W.

Mashington, 0.

C.

20036 Norman A. Coll., Esquire McCarthy, Steel, Hector 8 Oavis 14th Floor, First National Bank Building Miami, Fl orida 33131

~ Mr. Jack Shreve Office of the Public Counsel Room 4, Holland Bldg.

Tallahassee, Florida 32304

. Indian River Junior College Library 3209 Virginia Avenue Fort Pierce, Florida 33450

Enclosure RE(VEST FOR ADDITIONAL IHFORNTIOH ST.

LUCIE DEGRADED GRID VOLTAGE (TAC 10052)

FPL letter dated September 22, 1976, states the setpoint of 895 of 4;16 KV for the low voltage protection system corresponds to 83$

of 480Volts.

It also states'hat the 4 KY motors are designed to operate at 864 of 4160V and the 460V motors are also designed for operation at 86K of 480V; Provide the voltage analysis to demonstrate that the safety equipments of the 480 volt emergency buses 'operate without damage at your undervoltage setpoint.

The analysis should also address how the existing time delay will preclude spurious trips for short duration and motor starting voltage conditions.

Describe your coincident logic used on the und rvoltage protection.

Technical Specification Change should include total number of channels per bus and channels to trip.

Describe how IEEE Std. 279-1971 requirements are satisfied in the design of your undervoltage protection scheme.

The voltage monitdrs shall automatically initiate the disconnection of offsite power sources whenever the voltage setpoint and time delay limits have been exceeded (NRC letter June 2, 1977, Position 1 (d))-

Describ how your system meets this requirements.

FPL letter dated September 22, 1976, states, "The loss of offsite power under voltage relays remain functional through the loading sequence and operation of the diesel-generators."

FPL letter dated July 25, 1977 seems to contradict by stating, "Approximately 0.2 seconds. aFter the diesel generator breakers are closed, the 4.16 KV bus undervoltage relays are bypassed."

Clarify the discrepancy.

In the event an adequate basis can be provided for retaining the load shed feature when loads are energeized by the onsite power system, it is required that the=

setpoint value in the Technical Specifications specify a maximum and minimum limit. It is also required if load shedding is inhibited that the load shedding reinstatement be automatic when onsite breakers trip.

Provide basis and Technical Specification Change.

- The Technical Specifications shall include a r quirement, for tests:

(1) simulating loss of offsite power in conjunction with a safety injection actuation signal; and (2) simulating interruption and subsequent reconnection of onsite power sources to their respective buses.

Submit Technical Specification Changes if they do not exist.

Refer to Position 3, HRC letter dated June 2, 1977, Safety Evaluation and Statement of Staff Positions Relative to the E;urgency Power Systems For Operating Reactors.

7.

Table 4.3-2, HRC letter dated June 2, 1977, is a model Technical

Specification for surveillance requirements.

Submit a similar table for.your undervoltage protection.