ML19309C264

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Forwards Electrical Distribution Sys Review Summary.
ML19309C264
Person / Time
Site: Crystal River Duke Energy icon.png
Issue date: 04/03/1980
From: Richard Bright
FLORIDA POWER CORP.
To: Gammill W
Office of Nuclear Reactor Regulation
Shared Package
ML19309C265 List:
References
3--3-A-3, 3-0-3-A-3, NUDOCS 8004080374
Download: ML19309C264 (4)


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Power

. C O M P 0 m a t a o pe April 3, 1980 File: 3 3-a -3 4

Mr. William Gammill Acting Assistant Director for Operating Reactors Projects Division of Operating Reactors O. S. Nuclear Regulatory Commission Washington, DC 20555

Subject:

Crystal River Unit 3 Docket No. 50-302 Operating License No. DPR-72 Adequacy of Station Electric Distribution Systems Voltages

Dear Mr. Gammill:

As stated in our December 5,1979 letter to you, concerning the above +

subject, Florida Power Corporation had reviewed the electrical power systems at CR-3 in accordance with your letter dated August 8,1979, and had determined that the offsite power system and the onsite distribution system was adequate to allow the safety-related electrical loads to perform their functions under the conditions described in that letter.

Since receiving our above-referenced letter, the NRC has requested, by telephone, a copy of the CR-3 ELECTRICAL DISTRIBUTION SYSTEM REVIEW

SUMMARY

. The requested Summary is being provided as an attachment to this letter, f

We are not proposing any additional testing because we feel the previous tests are adequate to demonstrate that the electrical system '

will function as designed. A Turbine / Reactor Trip Test was performed which verifies that all onsite auxiliary loads will successfully transfer to the offsite source (Unit 3 Startup Transformer) following a reactor and/or turbine trip. The test and results are described -in Section 4.6 of the Crystal River Unit 3 Startup Report dated July 27, 1977. The ES Actuation - System, which includes the automatic block loading sequencing of the safety-related equipment described in the .

FSAR Table 8-1, was tested during the preoperational testing program. . '

8 0 04 0 803M General Offace 320i Nty founn street soutn. P O Bos 14042 st Pete'suurg Fiorda 33733 813-666-5151

' Mr. William Gamill Page Two April 3, 1980 In addition to the above testing,. the following infonnation should be cesidered:

1. The Unit 3 Startup Transformer is rated 61,600 kVA at 65'C temperature rise. During normal operation, the onsite auxiliary loads have been measured to be approximately 45,000 kVA. The additional safety-related loads, as a result of an ES Actuation, would be a maximum of 6,566 kVA (from FSAR Table 8-1). The total load of 51,566 kVA is well within the capacity of the Startup Transformer.
2. During conditions as described in the NRC _ letter, many non-safety-related loads would drop off (de-energize) as the loads would no longer be requi red. This would lower the total load in (1) above to a still more conservative level.

Therefore, it is concluded that the previous tests and additional information, as described above, provide adequate assurance that the onsite distribution sy stem, as powered from the offsite source, will operate as designed.

With respect to the setpoints of the undervoltage relays on the safety related buses, we are proposing to change the setpoints from the present level of 56.5%, as described in the attached summary, to a level of 80%. Because of the type of relay (GE Type IAV53K) a separate time delay is not required. An inherent time delay is built into the characteristics of the relay. Typically, a 3.3 sec. time delay would occur if the voltage is suddenly reduced to 0 volts with a setpoint of 80%. Other time delays associated with an undervoltage level would be as follows:

Undervoltage Level Time Delay 50% 5.5 sec.

60% 9.0 sec.

70 % 11.0 sec.

75% 14.0 sec.

80%

  • Time delay would have to be determined at time of adjustment.

Your acceptance of the above setpoint changes is required before we can actually initiate the changes.

Mr. William Gammill Page Three April 3, 1980 Should you have any questions concerning this matter, please contact this office.

Very truly yours, FLORIDA POWER CORPORATION R. M. Bright Acting Manager Nuclear Support Services Attachment EThewT01(012)

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l ' STATE OF FLORIDA i COUNTY OF PINELLAS F .!

R. ; M. Bright states that he is the Acting Manager, Nuclear l t Support Services, of Florida' Power Corporation; that he is authorized on the part of said company to. sign- and file-with the Nuclear Regulatory ' Commission .the information attached . hereto; .

I and that all such statements mad'e and matters set forth. therein +

. I are -true and correct _ to the best of ~ his knowledge, information  ;

and belief.

S I R. M.' Brfght  ?

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l Subscribed and sworn to before me, a Notary Public in and for the

- State and County above named, this 3rd day of April, 1980.  !

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8 Notary Public '

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, Notary Public, State' of Florida at Large,  :

My Comission Expires: August 8, 1983 I d

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