ML20205K431

Application for Amends to Licenses DPR-39 & DPR-48,revising Tech Specs to Reflect Mod of Nuclear Instrumentation Sys Positive & Negative Rate Trip Setpoints.Fee Paid

ML20205K431
Person / Time
Site:	Zion  File:ZionSolutions icon.png
Issue date:	02/24/1986
From:	Leblond P COMMONWEALTH EDISON CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
Shared Package
ML20205K435	List: ML20205K431 ML20205K441
References
1344K, NUDOCS 8602270372
Download: ML20205K431 (2)

Text

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/ One Fent Natiorel Plus. CNcego. flhnois (C Address Reply to. Post Othee Box 767 Chicago, Ilknois 60690 February 24, 1986 Nr. Harold R. Denton, Director Office of Nuclear Reactor Regulation l U.S. Nuclear Regulatory Cossaission Washington, DC 20555 I

Subject:

Zion Nuclear Power Station Units 1 and 2 Proposed Amendment to Facility Operating License Nos. DPR-39 and DPR-48

, NIS Flux Rate Trip Setpoints WRC Docket Mos. 50-295 and 50-304 References (a): November 28, 1979 letter from T. M. Anderson to A. T. Schwencer.

(b): December 4, 1979 letter from D. L. Peoples to H. R. Denton.

(c): February 24, 1986 Westinghouse letter from H. C. Walls to D. L. Farrar.

(d): January 18, 1979 letter from Leon Engle to Licensees (e): WCAP-10297, " Dropped Rod Methodology for Negative Flux Rate Trip Plants, June 1983.

(f): Ney 13, 1983 letter from D. C. Eisenhut to the NRC Cossaissioners.

Dear Mr. Denton:

Attachment 1 to this letter is a proposed amendment to Facility Operating License Nos. DPR-39 and DPR-48, Appendix A. Sections 2.1 and 3.1.

This change reflects the modification of the Nuclear Instrumentation System (NIS) positive and negative rate trip setpoints from i 15 percent in 5 seconds to i 5 percent in 2 seconds.

Attachment 2 provides the general history concerning this emendment request. It also contains the technical justification for altering these setpoints.

Attachment 3 transmits the interim compensatory measures that will be in effect on both Zion units until the setpoints have been modifled. It 1s anticipated that this will be completed by 7:00 a.m. on February 25, 1986.

l l Once established, Zion Station will continue to ut111:e the more conservative

(-5 percent /2 seconds) negative flux rate trip setpoint during the time period l required to process this change.

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. o H. R. Denton February 24, 1986 Attachment 4 contains a demonstration that the proposed amendment does not involve a significant hazards conalderation. This change has received on-site and off-site review and approval.

This amendment request is being processed under the guidance of 10 CFR 50.91.a.5. As discussed in Attachment 2, the failure to properly imple-ment WCAP 10297 resulted in a need to return to the guidance of reference (a) and the comitments made in reference (b) . However, a review of this issue by Westinghouse Electric Corporation (reference (c)) identified a need to apply both the interim measures and, in addition, modify the negative flux rate setpoint to be consistent with previous safety analyses. This notification modified Commonwealth Edison Company's understanding of this issue and was not known prior to this date.

If the existing requirements of Item 5 of Table 3.1-1 of the Zion Technical Specifications were fully implemented, then a. forced shutdown of both Zion units would result. Both reactors are currently operated at 100%

power. Thus, failure to act on this emergency Itcense amendment would result in the shutdown of both Zion units.

A $150.00 fee remittance is enclosed in accordance with 10 CFR 170.

As required by 10 CFR 50.91, the State of Illinois is being notifled of this amendment request by transmittal of a copy of this letter and its attachments.

If there are any further questions regarding this matter, please contact this office.

Three (3) signed originals and thirty-seven (37) copies of this transmittal and its attachments are hereby provided for your review.

Very truly yours, P. C. LeBlond Nuclear Licensing Administrator im Attachmento cc: HRC Resident Incpector - Zion J. A. Norris - NRR H. C. parker - State of Ill SUBSCH DED AND GWOH to befor me this P d day of s /.I!/Ll4d1A c_.,1986 JA iMh Notary Public

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