ML20010F452

Application for Amend of License DPR-28 Submitted as Proposed Change 98 to App A,Tech Specs Re Scram Insertion Times,Control Rod Accumulators & Min Critical Power Ratio

ML20010F452
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	09/02/1981
From:	Heider L VERMONT YANKEE NUCLEAR POWER CORP.
To:
Shared Package
ML20010F453	List: ML20010F452 ML20010F457 ML20010F459
References
FVY-81-128, NUDOCS 8109100225
Download: ML20010F452 (3)

Text

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Propoeed Change No. 98 VERMONT YAN KEtc NUCLEAR POWER CORPORATION -

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ENGINEERING OFFICE 2 SEr 101981 > .g September 2, 1981 io7 woacESTEn noAo 2"

gam FRAMINGH AM. M ASSACH USETTS 017o1 685W TELEPHONE 617-872 8100 nJ United States Nuclear Regulatory Commission Washington, D. C. 20555 Attention: Office of Nuclear Reactor Regulation Re ference : (a) License No. DPR-28 (Docket 50-271)

(b) Letter, VYNPC to USNRC, WVY 77-103, dated November 23, 1977.

Sub je ct: Reload 8 Licensing Submittal

Dear Sir:

Pursuant to Section 50.59 of the Commission's Rules and Regulations, Vermont Yankee Nuclear Power Corporation hereby proposes the following changes to Appendix A of the operating License.

Proposed Change:

The changes are described on Attachment 1. Revised pages are attached.

Reason for Change:

l The detailed reasons for specific changes are described on Attachment 1.

In general, the changes are made to reflect the first-time applica tion of Vermont Yankee methods to the Reload 8 licensing analysis. The other changes are upda tes of the technical specificati_ns per previous commitments or di s cus s ions .

Basis For Change:

The basis for the Vermont Yankee Reload 8 licensing analysis is provided by the Core Performance Analysis report, YAEC-1275, which is enclosed. This report presents licensing analysis results using methods developed by Vermont Yankee. The Vermont Yankee core reload licensing analysis methoc's development prog"am has been the subject of several meetings with the NRC, beginning in early 1980, during which the scope and general approach of the program were

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United States Nuclear Regulatory Commission Page 2 September 2,1981 g discussed. The meetings also served to establish the documentation requir ements for the methods, which have been met through issuance of eight methods description reports. These reports, which were previously submitted to the NRC and which are referenced in the enclosed Core Performance Analysis report, form the technical basis for the reload licensing analysis.

The change to the technical specification control rod drive scram times is being made in order to provide more MCPR margin at the end of the operating cycle when overpressurization transients become most limiting. The change is the saae as previously submitted as part of proposed change number 67

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Sa fety Considerations :

None of the proposed changes are deemed to involve significant unreviewed safety ques tions, for the following reasons.

The Vermont Yankee reload licensing analysis methods have been carefully '

developed over the past several years in accordance with plans which received prior NRC review and comment. The methods have received extensive review and application, both at Yankee and, in many cases, at national laboratories, EPRI, and other utilities. The methogs have been qualified with industry-standard data sets and standard problems. The results of the analyses have not shown unexpected trends or deviations from previous analyses. There are no major changes in fuel design, core design, or systems design, nor any changes in safety systems or reactor protection system setpoints which would significantly affect the results of a licensing basis analysis. Therefore, Vermont Yankee concludes that the methods can be used with confidence to evaluate core reloads for compliance with licensing requiremen ts .

The change in technical specification scram time is in a more conserva tive direction in that the proposed limits are closer to measured scram times. Eight cycles of operating experience have shown very stable scram sys tem performance, giving confidence in future compliance with the new limits. The current scram time limits a- retained as an alternative in the ualikely event that surveillance testins shows the new scram times cannot be met.

Fee Determination:

This proposed change requires an approval that involves a single safety issue and is deemed not to involve a significant hazards consideration. For these reasons ,- Vermont Yankee Nuclear Power Corporation proposes this change as a Class III Amendment. A payment of $4,000.00 is enclosed.

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United States Nuclear Regulatory Commission Page 3 September 2,1981 Schedule of Change: ,

This proposed change should be approved before NoveMer 29,1981, which is the currently planned startup date for Cycle 9.

Very truly your;i, VERMONT YANKEE NUCLEAR POWER CORPORATION SYY L. H. Heider Vice President COMMONWEALTH OF MASSACHUSETTS )

)ss MIDDLESEX COUNTY )

Then personally appeared before me , L. H. Heider, who, being duly sworn, did state that he is a Vice President of Vermont Yankee Nuclear Power Corporation, that he is duly authorize? to execute and file the foregoing request in the name and on the behalf of Vermont Yankee Nuclear Power Corporation, and that the statements therein are true to the best of his knowledge and belie f.

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