ML19210D060

Proposes Tech Spec Change 79-8 to DPR-35 Re Core Spray & Containment Cooling Sys.Change Optimizes Critical Path Time During Refueling & Other Outages by Performing Work Items in Parallel Sequence Rather than in Series.Revised Pages Encl

ML19210D060
Person / Time
Site:	Pilgrim
Issue date:	11/13/1979
From:	Howard J BOSTON EDISON CO.
To:	Ippolito T Office of Nuclear Reactor Regulation
Shared Package
ML19210D061	List: ML19210D060 ML19210D064
References
79-236, NUDOCS 7911200486
Download: ML19210D060 (2)

Text

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• BOSTON EOlBON COMPANY GOD BOYLSTON ETREET BOSTON. massachusetts 02199 J. COWARD HOWARC viss passessat wws6sas November 13, 1979 BECo. Ltr. #79- 236 Preposed Tech. Spec.

Change No. 79-8 Mr. Thomas A. Ippolito, Chief Operating Reactors Branch #3 Division of Operating Reactors Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D. C. 20555 License No. DPR-35 Docket No. 50-293 Proposed Technical Specification Change Re: Core Spray and Containment Cooling System

Dear Sir:

Introduction Pursuant to Section 50.90 of the Commission's Rules and Regulations, Boston Edison Company hereby proposes the following modification to Appendix A of Operating License No. DPR-35.

Proposed Change Technical Specification Section 3.5, 3.7 and the corresponding bases should be modified as shown in Attachment A. The changes from the existing Technical Specifications are indicated by vertical bars in the right margin. The essence of the changes are to allow the torus to be drained or a singlecontrol rod drive to be removed with irradiated fuel in the reactor when additional safety measures are adhered to.

Reason for Change This change allows Boston Edison to optimize critical path time during refueling and other outages by performing certain work items in parallel rather than in series. The benefit of the reduced outage time accrues to the consumer since less, higher cost replacement power is needed.

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Safety Considerations This proposed Technical Specification change is similar in approach to that granted to Millstone Nuclear Power Station Unit #1 (Docket No. 50-245, License DPR-21, Amendment #46) on March 10, 1978.

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BOSTON EDISON COMPANY Mr. Thomas A. Ippolito, Chief November 13, 1979 Page 2 The proposed changes to Sections 3.5 and 3.7 provide for the same degree of emergency safeguards protection during refueling as do the existing Technical Specifications 3.5 and 3.7, in that core cooling capability is not compromised while the torus is in a drained condition, since any leakage from the reactor vessel (via control rod blade) would enter into the torus and after accumulating 140,000 gallons of water, the torus would then serve as a common suction header for closed loop operation of LPCI or Core Spray. Maintaining the water inven-tory in the refuel cavity and dryer / separator pool at approximately 350,000 gallons provides assurance that should any leakage occur, water volume inventory is suf ficient to protect the core and reactor components prior to the requirement for use of LPCI or Core Spray to maintain reactor water level.

This Technical Specification change has been reviewed and approved by the Operations Review Committee and reviewed by the Nuclear Safety Review and Audit Committee.

Schedule of Change Boston Edison intends to make modifications during the January 1980 refueling outage whose duration could be minimized by use of this Technical Specification Change. Thus Boston Edison would like this proposed Technical Specification Change to be effective upon NRC approval.

Fee Consideration In accordance with Section 170.12 of the Commission's Regulations, Boston Edison proposes this license change as a Class III since it involves a single safety issue. Accordingly a check for Four Thousand Dollars ($4,000.00) is enclosed.

If there are any further questions on this subject please feel free to contact us at your convenience.

Very truly yours, Attachments J/zfi f 4d6 3 signed originals and 37 copies Commonwealth of Massachusetts)

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Then personally appeared before me J. Edward Howard, who, being duly sworn, did state that he is Vice President - Nuclear of Boston Edison Company, the applicant herein, and that he is duly authorized to execute and file the sub-mittal contained herein in the name and on behalf of Boston Edison Company and that the statements in said submittal are true to the best of his knowledge and belief.

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