ML20197B113

Application for Amends to Licenses DPR-39 & DPR-48,revising Tech Specs to Disable Rod Control Sys During Time Periods When Reactor in Mode 3 W/Less than Four Reactor Coolant Pumps Operating.Fee Paid

ML20197B113
Person / Time
Site:	Zion  File:ZionSolutions icon.png
Issue date:	10/16/1986
From:	Leblond P COMMONWEALTH EDISON CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
Shared Package
ML20197B116	List: ML20197B113 ML20197B123
References
NUDOCS 8610280029
Download: ML20197B113 (3)

Text

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g ) COnMnenwealth One First Nabonal Plaza.Edloon

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7 Address Reply to: Poet Omce Box 767

\/ Chicago, Illinois 60690 0767 October 16, 1986 Mr. Harold R. Denton, Director ,

Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555

Subject:

Zion Nuclear Power Station Units 1 and 2 Proposed Amendment to Facility Operating License Nos. DPR-39 and DPR-48 Number of RCP's in Mode 3 NRC Docket Nos. 50-295 and 50-304 References (a): July 9, 1984 Westinghouse letter from E. P.

Rahe, Jr. to D. Eisenhut (b): January 22, 1985 Westinghouse letter from E. P. Rahe, Jr. to H. Thompson (NRC).

Dear Mr. Denton:

Attachment i to this letter is a proposed amendment to Facility Operating License Nos. DPR-39 and DPR-48, Appendix A, Sections 3/4.3.1, Reactor Coolant System. This change will disable the rod control system at Zion Station during the' time periods that a reactor is in Mode 3 with less than four reactor coolant pumps operating. This will result in the restric-tions of the Zion Technical Specifications being consistent with the assumptions contained in the safety analysis.

Reference (a) provided initial notification of an inconsistency between the Technical Specifications at various plants and the Safety Analyses that had been performed. Reference (b) provided the NRC with an update regarding this issue and identified the uncontrolled rod withdrawal accident as being the sole event affected by this inconsistency.

Zicn Station's rod control system requires the application of electrical power to the control rod drive motors to produce rod movement.

This electrical power is supplied by the rod drive M-G sets through the reactor trip breakers. Thus, the addition of a requirement to either open the reactor trip breakers or to de-energize both rod drive M-G sets while in Mode 3 with less than four reactor coolant pumps operating precludes the possibility of experiencing an uncontrolled rod withdrawal event. This new restriction will ensure that Zion Station is operated in accordance with the assumptions contained in its safety analysis.

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r Mr. H. R. Denton October 16, 1986 Attachment 2 to this letter is a demonstration that the issue involves no significant hazards consideration. The proposed amendment has received on-site and off-site review and approval.

In accordance with 10 CFR 170, a fee remittance in the amount of

$150.00 is enclosed. As provided by 10 CFR 50.91, the State of Illinois is being notified of this amendment request by transmittal of this letter and the attachments.

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

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

Very truly yours, P. C. LeBlond Nuclear Licensing Administrator 1m Attachments cc: Region III Inspector - Zion l J. A. Norris - NRR M. C. Parker - State of Ill.

SUBSCRIBED AND G RN to befope e his /e - day of .(/(1 Mt.' , 1986

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" Notary Public l

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e ATTACIWWNT 1 PROPOSED CHANGES TO APPENDIX A TECHNICAL SPECIFICATION SECTIONS 3.3.1 AND 4.3.1 REACTOR COOLANT SYSTEM Pages Modified: 73 73a 73b 77b Pages Added: 73c 77c l

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