ML20246D401

Application for Amends to Licenses DPR-39 & DPR-48,modifying Tech Spec Section 3.15, Auxiliary Electric Power Sys to Permit Allowable Out of Svc Period for Diesel Generator to Be Extended to 45 Days for one-time Maint Overhaul

ML20246D401
Person / Time
Site:	Zion  File:ZionSolutions icon.png
Issue date:	07/06/1989
From:	Trzyna G COMMONWEALTH EDISON CO.
To:	Office of Nuclear Reactor Regulation
Shared Package
ML20246D405	List: ML20246D401 ML20246D413
References
NUDOCS 8907110317
Download: ML20246D401 (3)

Text

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Comm nwealth Edison ~-

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V Address Reply to:- Post Othce Box 767

"^ \ ' Chicago, Illinois 60690 0767 j"() A f f July 6, 1989-Director of. Nuclear Reactor Regulation

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US Nuclear Regulatory Commission Mail Station F1-137 Washington, DC 20555

Subject:

Zion Nuclear Power Station, Units 1 and 2 License Nos. DPR-39 and DPR-48

-Proposed knendment to Technical Specification

-Eection 3.15 " Auxiliary Electric Power System" References a) May 11, 1989 letter from GE Trzyna to US NRC/NRR b) June 8, 1989 letter from CP Patel to TJ Kovach c) June 14, 1989 telephone conversation between CECO /NRR personnel

. Gentlemen:

Attachment 1 to this letter outlines a proposed amen &nent to Facility Operating License Numbers DPR-39 and DPR-48, Technical Specifications, Appendix A. The proposed amendment requests a change to the out of service period associated with an inoperable diesel generator (DG) specifically as it applies to.the "O" (common) diesel generator.

The "O" diesel generator is shared between Units 1 and 2, and the existing Technical Specification Section 3.15.2.C permits reactor operation for 7 days, if the "O" diesel generator becomes inoperable. This snendment request would modify Section 3.15.2.C of the TecNnical Specifications to

. permit the allowable out of service period for the "O" diesel generator to be extended from 7 days to 45 days for a one-time maintenance overhaul. The proposed extension to 45 days is necessary in order to perform the extensive maintenance overhaul to the diesel generator in conformance with the manufacturer's recommendation that such overhaul be performed at five year intervals. An itemization of the tasks to be performed during this overhaul is contained in Attachment 2, Table 1. This maintenance overhaul is scheduled to begin at the beginning of the Unit 1, 1989 Fall Refueling Outage (presently scheduled from September 11 through November 20, 1989).

A previous request for the extension of the 45-day allowable outage time for "O" Diesel Generator was made in our submittal of May 11, 1989.

Subsequent to your review of the proposed amendment, the conclusion was

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determined to be that the proposto snendment did not adequately address all of the consequences of an extended diesel generator outage. You formally informed us of this decision by letter [ Reference (b)).

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2 - July 6, 1989

_Dir. of Nuc. Reactor Rag. - u j

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A telephone conference call between NRR ani Commonwealth Edison 1 personnel occurred on June 14, 1989 in order to try 'o resolve the concerns e

related to the proposed Technical Specification snen&,ent. The July 6, 1989 submittal has been structured to address the previous.ctncerns.

A summary.of the differences between the May 11, 1909 and July 6, 1989 submittals is listed below:

May 11, 1989 July 6, 1989 Item Submi. ital Submittal , _ _

1) Surveillance Test Not Addressed Required prior to the of remaining die';e1 DOS generators (DG) prior to taking "O" diesel 00S i l

2) Action if 2A or 2B DG Mode 3 within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Mode 3 within 4-hours becomes inoperable and Mode 5 within next and Mode 5 within next 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br /> 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />

3) Action if 1A or 1B No additional Immediate test of re-DG becomes inoperable surveillance required maining diesel tor the unit and of Comp.

Cooling and Service Water pumps.

Inoperable pumps would place Unit 2 in Mode 3 within 7 days and Mode 5 within next 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

4) Action if 1A and IB Unit 2 continued oper- Unit 2 enters Mode 3 DG become inoperable ating for 7 days & daily within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> and test of Comp. Cooling and and Mode 5 within 30 Service Water pumps hours.

5) Action if 2A or 2B Unit 2 enters Mode 3 Unit 2 entere Mode 3 DG become inoperable within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> and Mode 5 within 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. Mode 5 within 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

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, 1 Dir. of Nuc. Reactor Reg. July 6, 1989  !

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Attachment 2 providos a more ecmplete description and reason for the l proposed amendment.

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Attachment 3 to this letter contains a No Significant Hazardous Review and provides a demonstration that the proposed change warrants no significant hazards consideration.

Attachment 4 provides an excerpt from Zion's Probabilistic Safety Study Volume 3.

Attachment 5 provides the results of a Prebabilistic Risk Assessment evaluation for a 45-day outage period for "O" Diesel Generator performed every five years of plant operation. l Commonwealth Edison requests an expedited review of this proposed amendment and would greatly appreciate NRC approval by September 1, 1989, in I order to ensure orderly planning of the scheduled outage.

As provided by 10 CFR 50.91, the State of Illinois is being notified of this mnendment request by transmittal of this letter and attachments.

Please direct any questions you may have regarding this matter to j this office.

Very truly yours, E ,

l G.E. Trzyna Nuclear Licensing Administrator cc: C.P.Patel-NRR M.C. Parker-IDNS Resident Inspector-Zion l

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