ML24114A030
| ML24114A030 | |
| Person / Time | |
|---|---|
| Site: | 07109225 |
| Issue date: | 05/10/2024 |
| From: | Storage and Transportation Licensing Branch |
| To: | |
| Shared Package | |
| ML24114A027 | List: |
| References | |
| EPID L-2024-LLA-0008 | |
| Download: ML24114A030 (1) | |
Text
Enclosure UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 Non-Proprietary Request for Additional Information Docket No. 71-9225 Certificate of Compliance No. 9225 Model No. NAC-LWT Package By letter dated January 11, 2024 (Agencywide Documents Access and Management System Accession No. ML24011A277), NAC International, Inc. (NAC) submitted an application for revision to Certificate of Compliance No. 9225 for the Model No. NAC-LWT transport package.
The application includes a request to add Los Alamos National Laboratory (LANL) mixed oxide fuel (MOX) rods.
This request for additional information identifies information needed by the U.S. Nuclear Regulatory Commission (NRC) 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-2216, Standard Review Plan for Transportation Packages for Spent Fuel and Radioactive Material 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.
1.0 General Information
- 1.
Clarify the basis for the transfer tube top end spacer requirement to sit below the top of the transfer tube weldment by greater than or equal to the dimension shown in Note 3 of Drawing No. 315-40-188, revision 1P.
The staff is unclear whether this requirement is included to ensure the transfer tubes meet analyzed design requirements, or for ease of operations to ensure the top end spacer will be able to be inserted far enough to preclude interference with the PWR/BWR Rod Transport Canister lid. If the requirement is necessary to ensure design requirements are met, modify the operational steps in section 7.1.22 of the application to verify compliance before shipment.
This information is needed to determine compliance with Title 10 of the Code of Federal Regulations (10 CFR) Section 71.51.
Chapter 2.0 Structural Evaluation
- 1.
Provide the calculation package, NAC Calculation No. 14629-315-2000, Rev. 2, LWT Pin Shipment Can Assembly Structural Analysis."
Section 1.0, Synopsis of Results, of the package, Structural Evaluation of LANL MOX Transfer Tube Shipping Configuration for the NAC-LWT Transport Cask, in Enclosure 2 of the application (Reference 1) indicates that the NAC Calculation No. 14629-315-2000, Rev. 2 bounds the evaluation for the LWT Can Assembly containing the LANL MOX content for normal conditions of transport (NCT) and hypothetical accident conditions of transport (HAC). Provide the calculation package for completion of the staffs review.
This information is needed by the staff to determine compliance with 10 CFR 71.73(c)(1).
- 2.
Provide responses to the following questions related to the package, Calculation No.
50077-2002, Rev. 0, in Enclosure 2 of the application (Reference 1) and Subsection 2.6.12.18, LANL MOX Fuel Transfer Tubes and Divider Plates, and Subsection 2.7.7.20, LANL MOX Fuel Transfer Tube and Divider Plate, of Revision 24A of the SAR, in Enclosure 5 of the application:
- a.
Two-dimensional (2-D) structural analyses were performed using the ANSYS finite element (FE) program to demonstrate structural integrity of the divider plate under normal conditions of transport (NCT) and hypothetical accident conditions (HAC). Provide the engineering assumptions made for the analyses (e.g., theories of plane stress, plane strain, elasticity, plasticity, etc.).
- b.
The divider plate is a three dimensional (3-D) structural component in X-, Y-and Z-directions, not a 2-D component in X-and Y-directions. Justify that why the 2-D analyses are more realistic and conservative than 3-D analyses to characterize the performance of the divider plate for drops (end, side and oblique) under NCT and HAC.
- c.
Drawing No. 315-40-188-01 shows a cross sectional view of the NAC-LWT shipping configuration of LANL MOX fuel rod () and Figure A-1 in Calculation No.: 50077-2002, Rev. 0 shows the ANSYS FE mesh used for the flat side drop analyses of the divider plate under NCT and HAC, which are from Enclosures 5 and 2 of the application, respectively (Reference 1):
- i.
Indicate whether a spacer provided in a gap between a divider plate and a rod transfer can assembly wall is a full-or partial-support spacer (length and width)?
ii.
What are the magnitudes of the forces applied at the nodal points in the FE mesh for the flat side drop and oblique drop analyses under HAC?
iii.
What are the corresponding induced maximum membrane and bending stresses of the cross section at the end of the divider plate when it impacts the wall for both flat side drop and oblique drop analyses under HAC?
iv.
What is the purpose of placing the divider plate in the rod transfer can assembly? The rod transport canister assembly contains 16 transfer tubes (Drawing No. 315-40-189) loaded with the LANL MOX fuel rods. If a divider plate (Drawing No. 315-40-189) is used to maintain the position of the transfer tubes (four in each quadrant) inside the rod transport canister, explain how the position of those four transfer tubes in a quadrant are maintained under HAC?
- v.
Demonstrate that stability (i.e., buckling) of the LANL MOX fuel rod cladding in a quadrant is maintained during an end drop under HAC.
This information is needed by the staff to determine compliance with 10 CFR 71.73(c)(1).
Reference:
- 1. The NAC Application for Revision 74 to Certificate of Compliance No. 9225 for the Model NAC-LWT Package, Docket No. 71-9225, January 11, 2024:
- - List of Calculations, NAC-LWT SAR, Revision 24A,
- - List of Drawing Changes, NAC-LWT SAR, Revision 24A, and
- - NAC-LWT, LOEP and SAR Pages Revision 24A.