ML20082D428

Application to Amend Licenses NPF-9 & NPF-17 Revising Tech Specs Re Min RCS Flow Rate for Unit 2 & Changing Limits for Safety Sys Settings to Accommodate New RCS Flow Requirements

ML20082D428
Person / Time
Site:	McGuire, Mcguire
Issue date:	11/18/1983
From:	Tucker H DUKE POWER CO.
To:	Adensam E, Harold Denton Office of Nuclear Reactor Regulation
Shared Package
ML20082D431	List: ML20082D428 ML20082D485
References
TAC-53214, TAC-53215, NUDOCS 8311220423
Download: ML20082D428 (3)

Text

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DUKE POWER GOMPANY P.O. nox 33180 CHAMLOTTE, N.o. 28242 HALH.TUCKEH TELEPIEONE gg",',=,", November 18, 1983 M * '*"

Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Attention: Ms. E. G. Adensam, Chief Licensing Branch No. 4 Re: McGuire Nuclear Station

-Docket Nos. 50-369, 50-370

Dear Mr. Denton:

This letter contains proposed amendments to Facility Operating Licenses NPF-9 and NPF-17 for McGuire Nuclear Station Units 1 and 2. The proposed amendments would change the requirements in the Technical Specifications related to minimum Reactor Coolant System (RCS) flow rate for Unit 2. In addition, changes to the limits for safety system settings are proposed to accomodate the new RCS flow requirements.

Attachment I contains the proposed amendments, and Attachment 2 provides the justification and safety analysis to support the proposed amendments. Attachment 3 provides an analysis, pursuant to 10 CFR 50.91, which concludes that the proposed amendments do not involve a significant ha::ards consideration.

It is requested that the proposed amendmenta receive a timely review and be approved and made immediately effective as emergency license amendments purstrant to 10 CFR 50.91(a)(5). McGuire Unit 2 is currently derated to 90% Rated Thermal Power (RTP) because the measured RCS flow does not meet the existing requirement for operation above 90% RTP. Under the proposed amendments, operation at 100%

RTP would be allowed.

Duke Power could not have avoided this situation and has not delayed this application to take advantage of the emergency license amendment provision of 10 CFR 50.91(a)(5). RCS flow measurements made by the precision heat balance method are not made at power levels less than about 75% due to reduced accuracy.

McGuire Unit 2 initially achieved 75% RTP on September 10, 1983, and a precision heat balance measurement completed on September 13, 1983 provided the first indication of low RCS flow -- 390,300 gpm. RCS flow measurements completed on October 12, 1983 while at 90% RTP indicated 392,500 gpm total flow. McGuire Unit 2 completed the required startup testing for power ascension above 90% RTP on October 12, 1983 and has been derated since that date. After the low flow condition was identified, Duke Power initiated efforts to evaluate a proposed reduction in the RCS flow requirement; this safety evaluation was essentially completed on November 10, 1983.

0Y e31122o423 est ,ile 7 f$ay oo

r-Harold R. Denton

-November 18,'1983 Page 2 Pursuant to 10 CFR 170.22, Duke Power proposes that this application involves

.one Class III license amendment and one Class I license amendment; accordingly, a check for $4,400 is enclosed. These amendments have been reviewed and determined.to have no adverse. safety or environmental impact.

Very truly yours, C A f w Hal B. Tucker REH:j fw Attachments cc: Mr. James P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street NW, Suite 2900 Atlanta, Georgia 30303 Dayne H. Brown, Chief Radiation Protection Branch

' Division of Facility Services Department of Human Resources P. O. Box 12200

'Raleigh, North Carolina 27605 Mr. W. T. Orders NRC Resident Inspector

• McGuire Nuclear Station

Harold R. Denton November- 18, 1983-Page 3 H. B. TUCKER, being-duly sworn, states that he is Vice President of Duke Power Company; that he is authorized on the part of said Company to sign and file with the Nuclear Regulatory Commission this revision to the McGuire Nuclear Station Technical Specifications, Appendix A to License Nos. NPF-9 and NPF-17; and that all statements and matters set forth therein are true and correct to the best of his knowledge.

C' ~

Nal B. Tucker, Vice President-Subscribed and sworn to before me this 18th day of November, 1983.

lu -

Notary.Public My Commission Expires:

September 20, 1984 3

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