BECO-85-077, Application to Amend License DPR-35,consisting of Proposed Change 85-05,raising K-effective of Fuel Pool to Industry Std & Adding K-infinity Factor to Fuel Pool Limiting Condition for Operation.Fee Paid

Application to Amend License DPR-35,consisting of Proposed Change 85-05,raising K-effective of Fuel Pool to Industry Std & Adding K-infinity Factor to Fuel Pool Limiting Condition for Operation.Fee Paid

ML20115G231
Person / Time
Site:	Pilgrim
Issue date:	04/12/1985
From:	Harrington W BOSTON EDISON CO.
To:	Vassallo D Office of Nuclear Reactor Regulation
Shared Package
ML20115G233	List: BECO-85-077, Application to Amend License DPR-35,consisting of Proposed Change 85-05,raising K-effective of Fuel Pool to Industry Std & Adding K-infinity Factor to Fuel Pool Limiting Condition for Operation.Fee Paid ML20115G246
References
BECO-85-077, BECO-85-77, NUDOCS 8504220148
Download: ML20115G231 (4)

Text

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BOSTON EctsON COMPANY B00 B OYLSTO N STREET BOSTON. MASSACHUSETTS 02199 WILLIAM D. HARRINGTON c7mson vess passeosur uvetsam April 12, 1985 BEco 85-077 Proposed Change 85-05 Mr. Domenic B. Vassallo, Chief Operating Reactors Branch #2 Division of Licensing Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Comission Washington, D. C. 20555 License DPR-35 Docket 50-293 Proposed Technical Specification Change Fuel Storage Pool

Dear Sir:

Pursuant to the provisions of 10CFR50.90, the Boston Edison Company hereby proposes the attached modifications to Appendix A of Operating License DPR-35. These proposed modifications recomend raising the K-ef fective of the fuel pool to the industry standard and adding a K-infinity factor to the fuel pool LCO.

Very truly yours, r

I b ERM/ns Attachment 3 signed originals and 40 copies Comonwealth of Massachusetts)

County of Suffolk )

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

.My Comission expires: e rJfdd2 /) / C/83  ! C" Notary Public r504220148.850412 /

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E w .a Proposed Amendments to Technical Specifications Fuel Storage Pool A. Narrative

The present Technical Specification for the fuel storage pool provides a K-effective of 0.90 which is less than the industry standard of 0.95. It also does not list a K-infinity value. This proposal will change the K-effective from its present 0.90 to 0.95 to meet industry standard criteria, and will add a K-infinity value of i 1.35. The K-infinity will replace the maximum fuel loading criteria of U-235 and the maximum assembly average loading of weight percent U-235.

B. Reason for Change The Technical Specifications presently limit the fuel storage K-effective to 1 0.90. This is unnecessarily restrictive in accordance with regulatory and industry accepted practices. The proposed change in K-effective will provide more flexibility in the event of future redesign of the fuel racks.

The present design criteria in the Final Safety Analysis Report is a K-effective < 0.90 for normal conditions and a K-effective < 0.95 for abnormal conditions. The proposed K-effective 1 0.95 includes both conditions and does not reduce the margin of criticality from the original design.

C. S'fety a Considerations These changes do not present an unreviewed safety question as defined in 10CFR50.59. They.have been reviewed and approved by the Operations Review Committee,-and reviewed by the Nuclear Safety Review and Audit Committee.

D. Significant Hazards Consideration The NRC has provided guidance concerning the application of standards for determining whether license amendments involve.significant hazards

. considerations by providing certain examples (48FR14870). The change of the Technical Specification LCO to raise the K-effective limit of the fuel storage pool and add a K-infinity value is an example of an amendment which is considered not likely to involve a significant hazards consideration,.and provides, "(ii) a change that constitutes an additional limitation, restriction, or control not presently included in the Technical Specifications: for example, increasing the limit of the fuel pool.K-effective in order to conform.to the standard within the industry,

.while encompassing the limits of the original design criteria."

The present fuel racks at Pilgrim Station have been designed based sn an 8x8 fuel assembly with an average enrichment of 3.0 weight percent U-235, without gadolinia and water rods. This assembly design has a maximum

-K-infinity of 1.35. The proposed change will replace the linear U-235 density and enrichment with the corresponding maximum K-infinity of the

same assembly design which was used for the design of the present fuel racks. This change will not allow storage of.any assembly which has a maximum K-infinity greater than 1.35, thus guaranteeing a K-effective equal to or less than 0.95 when stored in the racks. The replacement of the maximum fuel loading criteria of grams of U-235, and the maximum average loading of weight percent U-235, will allow credit to be taken for the gadolinia which is mixed with the uranium oxide in the Pilgrim fuel assemblies.

E. Schedule of Change This amendment will be effective 30 days after receipt of approval by the NRC.

F. Application Fee Pursuant to 10CFR170.12(c), Boston Edison classifies this change as a Class III amendment. An application fee of $150 (check #896317) is included with this proposed amendment.

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