ML20090B909

Application for Amends to Licenses NPF-2 & NPF-8,changing TSs to Modify Thimble Location Required for Determining Quadrant Power Tilt Ratio When One Excore Power Range Channel Inoperable

ML20090B909
Person / Time
Site:	Farley
Issue date:	02/28/1992
From:	Woodard J SOUTHERN NUCLEAR OPERATING CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20090B911	List: ML20090B909 ML20090B913
References
NUDOCS 9203040134
Download: ML20090B909 (2)

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10 CfR 50.90 Docket lios. 50-348 50-364 U. S. fluclear Regulatory Commission A11th Document Control Desk Washington, D. C. 20555 Joseph M. f arley flucicar Plant Proposed Change to Quadrant Power lilt Ratio Technical _Spfei fic at ion Gentlemen:

The proposed changes in the Joseph H. farley fluclear Plant Units 1 and 2 Technical Specifications presented herein involve modifying the thimble locations required for determining the quadrant power till ratio (QP1R) when one excore power range channel is inoperable. These changes improve the operational flexibility of the units while still ensuring a valid QPTR determination which provides assurance that core peaking factors remain within their prescribed limits, in addition, this proposed change clarifies that when a full core flux map is performed, compliance with the peaking factor limits is assured directly without the QPlR determination. ,

Currently, the technical specifications specify that when an excore power range channel is inoperable above 75% rated thermal power, the QPTR verification be conducted through the use of movable incore detectors to confirm that the ratio is within its limit, lhis verification is done at least once per twelve hours either by using a full core flux map or by a limited scope flux map using the two sets of four unique symmetric thimble locations specified in Bases 3/4.2.4. In the event that one of the+,e unique thimbles is unavailable, a full core flux map is required at least once per twelve hours.

The unavailability of a thimble in the past and the requirement of using all specifically identified thimbles restrict the operating flexibility of the units and place undue burden on plant operators and technical staff.

To improve the situation, this proposed amendment to the farley Technical Specifications, Attachment 1, is requested to allow the use of other l thimbles under certain restrictions to provide the same monitoring  !

l capability. The proposed amendment includes a functionally equivalent, yet i operationally more flexible, surveillance requirement for the QP1R monitoring when an excore detector is inoperable.

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U. S. Nuclear Regulatory Commission Page 2 Attachment 2 contains the required significant hazards consideration analysis in accordance with 10 CFR 50.92. Based on the analysis provided, Southern Nuclear Operating Company has determined that the proposed changes to the Technical Specifications will not increase the probability or consequences of an accident previously evaluated, create the possibility of a new or different accident from any accident previously evaluated, or involve a reduction in a margin of safety.

Attachment 3 provides the basis for determining, pursuant to 10 CFR 51.22(b), that no environmental impact statement nor environmental assessment need be prepared in connection with this proposed technical specification change.

The Plant Operations Review Committee has reviewed the proposed changes and the Nuclear Operations Review Board will review the changes at a future meeting. NRC approval of these proposed changes is requested by february 1993.

A copy of these proposed changes is being sent to Dr. C. E. Fox, the Alabama State Designee, in accordance with 10 CFR 50.91(b)(1).

Respectfully submitted, 50VIHERN NUCLEAR OPERATING COMPAtlY h.3.

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. Woodard SWORN TO AND SUBSCRIBED BEFORE ME THIS A8 DAY Of Mc/;Aun ,1992 4 ftttu 2/ !c!

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JDW/BHW: map 1756 Attachments cc: Mr. S. D. Ebneter Mr. S. T. Hoffman Mr. G. f. Maxwell Dr. C. E. Fox