ML19056A058

Enclosure 1: Non-Proprietary RAI (Letter to W. Fowler Application for Amendment No. 8 to the Model No. Magnastor Storage Cask - Request for Additional Information)

ML19056A058
Person / Time
Site:	07201031
Issue date:	02/22/2019
From:	Bernie White Spent Fuel Licensing Branch
To:	Fowler W NAC International
White B
Shared Package
ML19056A056	List: ML19056A057 ML19056A058
References
EPID L-2018-LLA-0252
Download: ML19056A058 (1)

Text

Non-Proprietary Request for Additional Information Docket No. 72-1031 Certificate of Compliance No. 1031 Model No. MAGNASTOR Storage System By application dated September 12, 2018 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML18257A079), as supplemented on November 11, 2018 (ADAMS Accession No. ML18331A180), NAC International (NAC or the applicant) submitted an application, in accordance with Title 10 of the Code of Federal Regulations (10 CFR) Part 72, for Amendment No. 8 to Certificate of Compliance No. 1031 for the Model No. MAGNASTOR storage system. This request for additional information identifies information needed by the U.S. Nuclear Regulatory Commission staff in connection with its review of the application. The requested information is listed by chapter number and title in the applicants safety analysis report (SAR). The NRC staff used NUREG-1536, Standard Review Plan for Spent Fuel Dry Storage Systems at a General License Facility Final Report, in its review of the application.

Each question describes information needed by the staff for it to complete its review of the application and to determine whether the applicant has demonstrated compliance with regulatory requirements.

Thermal Evaluation

1. See Enclosure 2.

2. Verify that a two-dimensional (2-D) computational fluid dynamics (CFD) thermal model accurately captures the heat transfer characteristics of the test performed to validate MAGNASTOR thermal analysis.

[Proprietary information removed-See enclosure 2]

The certificate of compliance condition states, in part, that "The heat transfer characteristics and thermal performance of the MAGNASTOR SYSTEM will be validated by recorded mass flow measurements in the air flow cooling passages of the first system placed in service with a heat load equal to or greater than 30 kW. The analysis provided by the applicant does not appear to accomplish this. The applicant may need to develop a more detailed three-dimensional (3-D) model in order to accurately capture the heat transfer characteristics of the test designed for this specific purpose. When performing validation, solution verification (to obtain the discretization error), and uncertainty quantification studies the staff uses American Society of Mechanical Engineers (ASME) Verification and Validation (V&V) 20-2009 Standard for Verification and Validation in Computational Fluid Dynamics and Heat Transfer and NUREG-2152 Computational Fluid Dynamics Best Practice Guidelines for Dry Cask Applications.

The staff needs this information to confirm that the applicants thermal model adequately captures the heat transfer characteristics of the designed test to validate the MAGNASTOR thermal analysis, as required by the certificate of compliance.

This information is necessary to verify the requirements of 10 CFR 72.236(f), (l), and (m).

Enclosure 1