ML20031C980

Application to Amend Licenses DPR-57 & NPF-5,changing Tech Specs Re Limiting Conditions for Operation & Surveillance Requirements for Degraded Voltage Relays & Loss of Offsite Power Relays

ML20031C980
Person / Time
Site:	Hatch
Issue date:	10/02/1981
From:	Widner W GEORGIA POWER CO.
To:	Office of Nuclear Reactor Regulation
Shared Package
ML20031C981	List: ML20031C980 ML20031C991
References
TAC-10026, TAC-11026, TAC-11262, TAC-12831, TAC-47044, TAC-47045, TAC-47876, TAC-47877, NUDOCS 8110090178
Download: ML20031C980 (2)

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W. A. Widner qQ;\\ 61 E Na N,,*o N In"""d" October 2, 1981 4

4 Ocr [8 /.9g Director of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission pg Washington, D. C.

20555 b-NRC 00CKETS 50-321, 50-366

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OPERATING LICENSES DPR-57, PPF-5 U-7 EDWIN I. HATCH NUCLEAR PLANT UNITS 1, 2 EMERGENCY POWER SYSTEMS Gentlemen:

On July 22, 1977, Georgia Power Company proposed Unit 1 Technical Specifications for the disconnection from offsite power in the event of loss of offsite power or a

sustained degraded system voltage at the interconnection to offsite power.

Our submittal was then amended on May 21, 1981, in order to meet the tRC position stated in item 1 of the attachment to your October 30, 1979, letter for providing surveillance requirements for a second level of undervoltage protection.

This amendment refines the trip settings, corrects the number of required operable channels, and deletes note (c) on Table 3.2-12 of the Unit 1 Technical Specifications.

Additionally, the surveillance requirements for the Logic System is corrected to reflect the need to test both sets of

relays, i.e.,

degraded voltage relays as well as loss-of-offsite-power relays.

Additionally, Georgia Power Company (GPC) has performed an assessment of the current design of the Plant Hatch Unit 2 emergency power systems in accordance with the staff positions contained in your letter of June 2, 1977, to determine the suscerM L11ty of safety-related electrical equipment to 1) sustained degraded voltage conditions at the offsite power sources and to 2) interaction between the offsite and onsite emergency power systems.

In accordance with staff position 1 of the referenced letter, GPC proposes to modify our existing Technical Specifications to include a second level of undervoltage protection.

The proposed changes include limiting conditions for operation and surveillance requirements for both degraded voltage relays and loss-of-offsite-power relays.

Our system protection personnel determined that additional protection against the degraded system voltage condition could be achieved by a revised combination of settings of the bus undervoltage relays.

Accordingly, the relay values were changed such that two relays on each aus are set to the 105 volt tap, time dial 5, and two relays on each bus are set to the 93 volt tap, time dial 2.

The logic tests are amended to assure that both degraded voltage relays and loss-of-offsite-power relays are tested, ft $

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6*5 8110090178 811002 PDR ADOCK 05000321 g

GeorgiaPower A Director of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission October 2, 1981 Page Two The Plant Review Board and the Safety Review Board have reviewed and approved the proposed changes to the Technical Specifications and have determined that the probability of occurrence or the consequences of an i

accident or malfunction of equipment important to safety are not increased since the proposed changes impose additional requirements to assure proper l

cperation of the onsite power system.

The possibility of an accident or malfunction of a new or different type than those previously analyzed are not created since the only plant modifications involved the changing of the logic in order to increase the level of protection of the emergency

'lectrical distribution system.

Hence, the margin of plant safety is not reduced.

The proposed Unit 1 and Unit 2 Technical Specifications are attached.

The Unit 1 Technical Specifications are changes to a previous submittal.

The Unit 2 Technical Specifications constitute a category 1 submittal for fee class determination.

j If you have any questions, please contact this office.

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W. A. Widner states that he is Vice President of Georgia Power Company and is authorized to execute this oath on behalf of Georgia Power Company, and that to the best of his knowledge and belief the facts set forth in this i

letter are true.

GEORGIA POG1 COMPANY t

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j By:

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2 W. A. Widner I

Sworn t and subscribed before me this 2nd day of October,1981.

'S my s En 1 3 Notary Public i

OLT/mb Attachment b

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M. Manry

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R. F. Rogers, III l

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