ML20133M854

Forwards Revised NSHC for 850712 & 26 Applications for Amends to Licenses DPR-39 & DPR-48,raising Enrichment Limits to Approx 3.7 W/O for Spent Fuel Pool & 4.0 W/O for New Fuel Vault,Per Ja Norris Request

ML20133M854
Person / Time
Site:	Zion  File:ZionSolutions icon.png
Issue date:	08/02/1985
From:	Leblond P COMMONWEALTH EDISON CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
0439K, 439K, NUDOCS 8508130291
Download: ML20133M854 (4)

Text

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• j W N - Commonwealth Edison

-/ ) one First N tion 11 Plua Chicfgo, lihnois k Address Reply to. Post Office Box 767 (j-O } Chicago, Illinois 60690 August 2, 1985 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 NRC Docket Nos.-50-295 and 50-304 References (a): July 12, 1985 letter from P. C. LeBlond to H. R. Denton.

(b): July 26, 1985 letter from P. C. LeBlond to H. R. Denton.

Dear Mr. Denton:

The referenced letters transmitted a proposed amendment to Facility Operating License Nos. DPR-39 and DPR-48, Appendix A, Section 5.0 - Design Features. This change will raise the enrichment limits to approximately 3.7 w/o for the Spent Fuel Pool and 4.0 w/o for the New Fuel Vault. N Mr. J. A. 'Norris of your office has requested a revised

~ demonstration of no significant hazards consideration that more directly addresses the three criteria contained in 10 CFR 50.92. This revised analysis is enclosed with this letter. Please replace Attachment 3 of reference (a) with the attached document.

As required by 10 CFR 50.91, the State of Illinois is being notified of this amendme. by transmittal of a copy of this letter and the attachment.

Three signed original and thirty-seven (37) copies of this letter and its attachments are hereby provided for your review.

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H. R. Denton August 2, 1985 If.there are any further questions regarding this matter, please contact this office.

Very truly yours, P. C. LeBlond Nuclear Licensing Administrator 1m'

-Attachment cc: NRC Resident Inspector - Zion J..Norris - NRR G. Wright - State of Ill.

to SUBSCR befo me BED this OAND S g day of- Alt 1 h , 1985 (A 8#!)

Notary Public (

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ATTACHMENT EVALUATION OF SIGNIFICANT HAZARDS-CONSIDERATION-PROPOSED CHANGES TO ZION TECHNICAL L

SPECIFICATIONS APPENDIX A - SECTION 5.0 DESIGN FEATURES DESCRIPTION OF - AMENDlENT REQUEST An amendment to the Zion Facility Operating License is proposed to allow the storage of 4.0 w/o U-235 fuel in the New Fuel Vault and 3.7 w/o fuel

'in Zion's Spent Fuel Pool BACKGROUND 10 CFR 50.92 states that a proposed amendment will involve a no ,

. significant hazards consideration if the proposed amendment does not:

(1) Involve a significant increase in the probability or consequences of an accident previously evaluated; or '.

(2). Create the possibility of a new or different kind of accident from any accident previously evaluated; or (3) Involve a significant reduction in a margin of safety.

In addition, the Commission has provided guidance in the practical application of these criteria by publishing eight examples in 48 FR 14870.

TRwe discussion below below addresses each of these three criteria and demonstrates that the proposed amendment involves a no significant hazards

. consideration.

BASIS FOR NO-SIGNIFICANT HAZARDS CONSIDERATION DETERMINATION Does the proposed amendment L

(1) Involve a significant increase in the probability or consequences of an accident previously evaluated; or (2) Create the possibility of a new or different kind of accident from any accident previously evaluated; or (3)_ Involve a significant reduction in a margin of safety?

DISCUSSION --ITEM 1 The storage of 3.7 w/o fuel in the Spent Fuel Pool and 4.0 w/o fuel in the New Fuel Vault could only affect the fuel handling accidents. The enric!nent increase will not significantly affect the potential consequences of a fuel drop accident, since the isotopic content of a discharged. assembly is relatively insensitive to the assembly's initial enrichment.

The probability of a fuel handling accident is similarly unaffected by the enrichment increase. There are no structural changes involved that could affect the handling characteristics of Zion's fuel.

DISCUSSION - ITEM 2 The enrichment increase does not create the possibility for any new or different type of accident. All other acceptance criteria and operating parameters (DNBR, Fg, etc.) will remain unchanged.

DISCUSSION - ITEM 3 While the storage of fuel with increased enrichment will potentially bring the Spent Fuel Pool and the New Fuel Vault somewhat closer to  ;

criticality than was previously possible, this safety margin reduction is not significant.

Attachments 2 and 4 demonstrate that the results of the proposed change are clearly within all accepteble criteria. Specifically, the reactivity acceptance criteria of the Standard Review Plan, Section 9.1.1 and 9.1.2, have been satisfied. ,

Note that the proposed amendment meets and exceeds the example (vi) of the Commission guidance provided by 48 FR 14870.

(vi) A change which either may result in some increase to the probability or consequences of a previously-analyzed accident or may reduce in some way a safety margin, but where the results of the change are clearly within all acceptable criteria with respect to the system or component specified in the Standard Review Plan: for example, a change resulting from the application of a small refinement of a previously used calculational model or design method.

Therefore, since the application for amendment satisfies the criteria specified in 10 CFR 50.92 and is similar to examples for which no significant hazards consideration exists, Commonwealth Edison Company has made a determina-tion that the application involves no significant hazards consideration.

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