ML20056G231

Forwards Rev to TS Bases to Reflect Operational & Design Changes Made to CNS Svc Water Sys During 1993 Refueling Outage

ML20056G231
Person / Time
Site:	Cooper
Issue date:	08/25/1993
From:	Horn G NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20056G232	List: ML20056G231 ML20056G234
References
NSD930688, NUDOCS 9309020282
Download: ML20056G231 (2)

Text

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GENERAL OFFICE N Nebraska Public Power Districi P.O. BOX 499. COLUMBUS. NEBRASKA 68602-0499 -

"fa"d3l 'R" NSD930688 August 25, 1993 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 Gentlemen:

Subject:

Revision to Technical Specifications Bases Associated With Design Change to Service Water and Reactor Equipment Cooling Systems Cooper Nuclear Station, NRC Docket 50-298, DPR-46

Reference:

Letter from R. L. Gardner to NRC dated March 18, 1993, submittal of CNS Licensee Event Report 93-001. ]

The Nebraska Public Power District (District) hereby submits a revision to the Cooper Nuclear Station (CNS) Technical Specifications Bases section. This change revises the Bases Section for CNS . Technical Specifications Section 3.12.C, -

" Service Water System," to reflect operational and design changes made to the CNS Service Water System during the 1993 Refueling Outage.

During ongoing activities associated with the . District's Design Basis Reconstitution Program, der.ign discrepancies were identified concerning the divisional power separation of components in - the Service Water and Reactor Equipment Cooling Systems which could have impacted the response of these systems to a design basis Loss-of-Coolant-Accident concurrent with the loss of offsite power. This issue was the subject of CNS Licensee Event Report 93-001, submitted to the NRC by letter dated March 18,1993 (Reference). - The District has recently performed plant modifications to the Service Water and Reactor Equipment Cooling systems to resolve the identified concern. Additionally,. the . District has performed a station safety evaluation, supported by a Control Building heatup calculation, which demonstrates that the Control Building basement fan coil unit is not required to ensure operabilility of the RHR Service Water System. These changes are reflected in the attached revisions to the Service Water System Technical Specifications Bases.

The resultant changes to Section 3.12.C of the Bases _section occur on pages 215d and 215e of the Technical Specifications, and are shown on the attached pages.

As stated above, these Bases section - changes reflect plant. modifications evaluated with respect to 10 CFR 50.59 and determined to be' acceptable. The attached changes have also been reviewed by the District's safety review committees. Accordingly, the District submits the attached Bases: changes for your information, and will distribute the revised pages to CNS Technical 9309020282 930825 1

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, August 25, 1993 Page.2 of 2 t

Specifications holders with the distribution of the next issued license [

amendment.

l Please contact ne if you have any questions or require any additional information on this. subject.

orn Vice President - Nuclear f GRH:MJB  !

Attachment cc: NRC Regional Administrator Region IV ,

Arlington, TX NRC Resident Inspector  !

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