ML22031A221

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{{#Wiki_filter:KPS Technology Campus, 1 Holtec Blvd., Camden, NJ 08104 Telephone (856) 797-0900 - Fax (856) 797-0900 www.holtecinternational.com January 31, 2022 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Docket No. 99902086 - HDI Spent Fuel Pool Heatup Calculation Methodology

Subject:

Holtec Presentation Materials for February 3, 2022, ACRS Full Committee Meeting

Reference:

Letter from Holtec International to US NRC, Holtec Spent Fuel Pool Heat UP Calculation Methodology Topical Report, September 29, 2020 (ADAMS Accension No. ML20280A524)

Dear Sir or Madam:

In the Referenced letter, Holtec submitted a Topical Report providing a methodology for calculating Spent Fuel Pool heat up for NRC review and approval. Holtec believes the methodology will be a large benefit in reducing zirconium fire risks in the spent fuel pool. The Topical Report is scheduled for discussion during the February 3, 2022, ACRS Full Committee Meeting. Holtec is providing the enclosed presentation materials in advance of the meeting. provides the Holtec Presentation for the Open Session (Public Session) for the full committee meeting. Enclosure 1 is non-proprietary. If you have any questions, please contact me at 856-797-0900 ext. 3578. Sincerely, Jean A. Fleming VP, Regulatory and Environmental Affairs Holtec Decommissioning International Jean A. Fleming Digitally signed by Jean A. Fleming Date: 2022.01.31 14:09:46 -05'00'

KPS Technology Campus, 1 Holtec Blvd., Camden, NJ 08104 Telephone (856) 797-0900 - Fax (856) 797-0900 www.holtecinternational.com

Enclosures:

Holtec Presentation for the Open Session February 3, 2022, ACRS Committee Meeting (Non-proprietary) cc: Robert Lucas, NRC, NRR/DORL/LLPB Dennis Morey, NRC, NRR/DORL/LLPB Ekaterina Lenning, NRC, NRR/DORL/LLPB Christopher Regan, NRC, NMSS/DFM

www.holtec.com Topical Report: Method for Determining Spent Fuel Assembly Heat Up During a Theoretical Drain Down Event of a Spent Fuel Pool Holtec Presentation to ACRS Full Committee OPEN Session February 3, 2022

www.holtec.com l Page 2 Purpose of the Topical Report Provide a methodology to proactively determine the best overall spent fuel pool arrangement to eliminate the risk of a zirc fire as soon as possible after permanent defueling. The methodology developed by Holtec can be used to gain a significant and real safety benefit that can be recognized.

www.holtec.com l Page 3 Problem Description During a theoretical beyond design basis drain down event of a spent fuel pool, the cladding of the fuel assemblies would heat up due to the loss of water cooling in the pool. If the cladding temperature exceeds a certain value, there is the possibility of an exothermal reaction with the air, possibly resulting in what is commonly called a zirconium fire or zirc fire.

www.holtec.com l Page 4 Acceptance Criteria and Principal Approach The criteria to evaluate if such a condition may occur, used in previous applications and reviewed and approved by NRC, is that a cladding temperature of 900 °C is not exceeded within 10 hours from the drain-down event. The principal approach to determine if the condition could occur or not is to perform a transient thermal analysis, and determine the parameters (e.g. cooling time of the fuel assemblies) that needs to be satisfied for the temperature to not exceed the limit within that time.

www.holtec.com l Page 5 Previously used Methodology The methodology previously used, and reviewed and approved by NRC, is a transient thermal calculation using the following main conservative assumptions 1. A single assembly is analyzed 2. Highest decay heat of all assemblies in the spent fuel pool is applied to that assembly 3. No lateral heat loss to surrounding assemblies 4. No air flow through the rack and assembly 5. No other axial heat loss through the top and bottom of the spent fuel rack Implementation is fairly simple Can be done with a simple analytical calculational approach, or a simple spreadsheet.

www.holtec.com l Page 6 Methodology proposed in Holtec Topical Report (TR) Principal difference between the Holtec TR and the previously approved methodology is that the Holtec TR methodology considers limited heat transfer between assemblies This informs the development of thermally optimized loading patterns throughout a spent fuel pool The methodology keeps the conservative assumption that there is no heat transfer from the assemblies to the outside environment No significant increase in the complexity of calculations

www.holtec.com l Page 7 Summary A topical report has been submitted that improves on the method to determine if a zirc fire is possible in a spent fuel pool after the assumed drain-down of the water in the pool. The method still employs significant conservatisms. Specifically, it still assumes there is no air flow through the rack cell and assemblies after the drain down event.}}

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