ML20148G916

Submits Proposed Change 142 to Tech Specs Modifying Figures 8-1,3.2-1 & Adding Corresponding Table of Contents & App C Re Core 12 Performance Analysis

ML20148G916
Person / Time
Site:	Yankee Rowe
Issue date:	10/08/1976
From:	Heider L YANKEE ATOMIC ELECTRIC CO.
To:	Office of Nuclear Reactor Regulation
Shared Package
ML20148G922	List: ML20148G916 ML20148G924 ML20148G929
References
WYR-76-103, NUDOCS 8011140249
Download: ML20148G916 (2)

Text

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--- I S 076 ep u.s. m United States Nuclear Regulatory Ccmmission Washington, D. C. 20555

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Attention: Office of Nuclear Reactor Regulation k O

Subject:

Additional Core XII LOCA Analysis with Elevated Upper Hemispherical Head Temperature

Reference:

1) License No. DPR-3 (Docket No. 50-29)

2) Technical Specification " Yankee Nuclear Power Station Core XII Performance Analysis", (July 9,1975)

3) Order for Modification of License, (August 27, 1976)

4) Letter from W. P. Johnson to USNRC, WYR 76-88, (August 27, 1976)

Dear Sir:

Pursuant to Section 50.59 of the Commission's Rules and Regulations, Yankee Atomic Electric Company hereby proposes the following modifications to Appendix A to the Technical Specifications:

PROPOSED CHANGE: It is proposed that:

1. The attached Figure 8-1 replace the corresponding figure in Appendix A of the current operating Technical Specifications;

2. The attached Figure 3.2-1 replace the corresponding figure in Yankee Rowe Core XII Standard Technical Specificatione;

3. The attached table of contents replace the corresponding table in Reference 2 above, and;

4. The attached Appendix C be added to Reference 2.

REASON FOR CHANGE: In response to your Order (Reference 3) of August 27, 1976, a re-analysis of the Loss of Coolant Accident (LOCA) has been completed. This re-analysis assumes that the initial coolant temperature in the upper head of the reactor vessel is equal to the reactor outlet temperature as described in the attached Appendix C.

The results of a re-analysis of the most limiting break size (0.6 DECLG) indicate, as previously reported (Reference 4), that a

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THIS DOCUP > CONTAINs 10211 8011140gQ. P00R JAun PAccs

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I J United States Nuclear Regulatory Commission October 8, 1976 Attn Office of Nuclear Reactor Regulation Page Two small reduct' ion in the allowable peak linear heat generation rate (LHGR) is required in order to remain in conformance with 10CFR50.46. You have made use of these results in your Order (Reference 3).

In addition, a re-analysis of the two pertinent breaks demonstrates that the limiting break size does not change. Thus, the 0.5 kw/ft penalty to account for uncertainty about the worst break size need not be applied as required by your Order (Reference 3) . ,

On the basis of these results, the attached figures from the current  ;

operating Technical Specifications and the Standard Technical Specifications have been revised.

SAFETY CONSIDERATIONS: Based on the analysis contained in Appendix C >

attached hereto, it is concluded that Core XII operation with the revised restrictions on allowable peak LHGR will not endanger the health and safety of the public.

However, until this change is approved, Core XII operation will proceed within the more restrictive limits imposed in Reference 3. l This proposed change has been reviewed by the Nuclear Safety Audit ,

and Review Committee.  ?

SCHECULE OF CHANGE: Core XII is operating at a reduced power level in conformance with the restrictions imposed in Reference 3. We respect-fully request review of this proposed Change by the Commission as soon as practical.

Any questions regarding this Proposed Change should be directed to '

Mr. W. J. Szymczak at our Engineering Office, 20 Turnpike Road, Westboro, Msssachusetts, 01581, (617) 366-9011, Extension 2844.

Respectfully submitted, j YANFIE ATOMIC ELECTRIC COMPANY Y4-%./ .

L. H. Heider Assistant Vice President COMMONWEALTH OF MASSACHUSETTS) l )ss.

COUNTY OF WORCESTER )

Then personally appeared before me, L. H. Heider, who, being duly sworn, did state that he is Assistant Vice President of Yankee Atomic ~

Electric Company, that he is duly authorized to execute and file the ,

foregoing request in the name and on the behalf of Yankee Atomic Electric Company, and that the statements therein are true to the bust of his knowledge and belief.

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Frederic E. Greenman Uotary Public My Commission Expires October 6, 1978

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