ML20125A914

Requests That Licensee Provide Addl Info Re 850318 Application to Amend License DPR-54 Concerning Boron Concentration During Periods of Refueling.Draft Transmittal Ltr to Licensee & Request Encl

ML20125A914
Person / Time
Site:	Rancho Seco
Issue date:	06/05/1985
From:	Kirsch D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
To:	Thompson H Office of Nuclear Reactor Regulation
References
TAC-57293, NUDOCS 8506110244
Download: ML20125A914 (3)

Text

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JtJN 051985 MEMORANDUM FOR: Hugh L. Thompson, Jr., Director Division of Licensing, NRR FROM: Dennis F. Kirsch, Acting Director Division of Reactor' Safety and Projects

SUBJECT:

. REQUEST FOR ADDITIONAL INFORMATION - BORON CONCENTRATION DURING REFUELING TAC NO. 57293 Plant Name: Rancho Seco Nuclear Generating Station Docket No.: 50-312 Responsible Branch: Operating Reactors Branch No. 4 Project Manager: Sydney Miner Review Status: Incomplete This TAC _ addresses the licensee's request to revise the minimum boron concentration required during periods of refueling. In order to complete our review of this request, we find we need additional information as specified in the enclosed draft letter to the licensee. If you concur with this need, please transmit this letter to the licensee,at your earliest convenience.

If you have any questions, please call. Jerry Zwetzig at FTS 463-3749.

/ 7(h iIh)

Dennis F. Kirsch, Acting Di> rector i

Division of Reactor Safety and Projects

Enclosure:

Draft letter to licensee with enclosure cc:

S. Miner, NRR J. Thoma, NRR G. Lainas, NRR J. Eckhardt, RV L. Miller, RV R. Pate, RV G. Zwetzig, RV Via: 5520: Division f Licensing, NRR ID: Rancho TAC No. 52955

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3 Mr. Ronald J.(Rodriguez I ' ' '

' Executive Director,. Nuclear . >

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, . Sacramento Municipal. Utility District 6201 S Street;- -

P. 0..-Box-15830 / .

. Sacramento, California -95813 -

Dear ,

Mr. R'o_driguez: ,

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SUBJECT:

BORON CONCENTRATION DURING REFUELING i The--staff is conducting its review of your request for a change.in the minimum boron concentration required during periods of refueling. Based on our review

>as of this'date, we have identified the need for additional information as

' listed in the enclosure. It is requested that you provide this information within~45 days of' receipt of this letter.

This request for. information was approved by the Office of Management and Budget under clearance number XXXX-XXXX. Comments on burden and duplication

-may be directed to the Office of Management and Budget, Reports Management, Room 3208, New Executive Office Building, Washington, D.C. 20503.

Sincerely, i

l John F. Stolz, Chief '

Operating Reactors Branch #4 Division of Licensing

Enclosure:

Request for Additional Information l-cc w/ enclosure:

See next page l-l 4

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ENCLOSURE-REQUEST FOR ADDITIONAL INFORMATION RELATING TO PROPOSED LICENSE AMENDMENT NO. 126 REFUELING BORON CONCENTRATION RANCHO SECO NUCLEAR GENERATING STATION

~ DOCKET NO.: 50-312

1. Your submittal of March 18, 1985 states that a boron concentration of 1974 ppm will "... sustain a reactivity condition of Keff = 0.95 or less with all control rods removed from the core." (underlining added).

Neither the Rancho Seco Updated Safety Analysis Report (containing nuclear data for Cycle 6) or the Reload Report for Cycle 7, however, provide a basis for confirming the correctness of this concentration.

Therefore, please provide a copy of the analysis that resulted in this estimate. If the analysis utilizes information from reference documents, please provide applicable extracts from the references.

2. If your-review of the information needed for this submittal should reveal an error in the analysis that would increase the required concentration, please provide an appropriate revision to your' request and to LER 85-03.

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