ML25006A106
| ML25006A106 | |
| Person / Time | |
|---|---|
| Site: | 07109382 |
| Issue date: | 01/13/2025 |
| From: | Storage and Transportation Licensing Branch |
| To: | TN Americas LLC |
| Shared Package | |
| ML25006A105 | List: |
| References | |
| EPID L-2024-LLA-0028 | |
| Download: ML25006A106 (1) | |
Text
Enclosure UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 Request for Additional Information Docket No. 71-9382 Certificate of Compliance No. 9382 Model No. TN Eagle Package By letter dated July 11, 2024 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML24193A281), TN Americas LLC (applicant) submitted an amendment request for certificate of compliance No. 9382 for the Model No. TN Eagle spent fuel package.
The amendment request included (i) a new neutron shielding ring type C1 (made of carbon steel only), filled with a new type of neutron shielding resin (VYAL-HT) to the TN Eagle cask SC configuration. This new VYAL-HT resin material can withstand higher temperatures, (ii) updated bounding paint emissivity and absorptivity values for the TN Eagle cask SC configuration, (iii) updated the criticality analysis for already loaded 32PT Dry Shielded Canisters (DSCs) 16-poison-plate and 24-poison-plate Type A configurations loaded with CE 14x14 fuel class. The analysis addresses the 10 dry shielded canisters (DSCs) (32PT DSC 16-poison-plate and 24-poison-plate Type A) loaded in 2006 and 2009.
The application was accepted for review on September 3, 2024 (ML24242A258).
This request for additional information identifies information needed by the U.S. Nuclear Regulatory Commission staff in connection with its review of the application.
Each question describes information needed by the staff to complete its review of the application and to determine whether the applicant has demonstrated compliance with regulatory requirements.
MATERIALS EVALUATION Provide the references for paragraph 11b, Thermal Properties of Resin (Vyal-HT), to section 3.2.1.
Change No. 4 adds paragraph 11b to section 3.2.1, on page 3-20. This paragraph states from Table 6-7 of [6.1]... FLUENT [6.6] but these references do not appear in the revised document, nor in the Safety Analysis Report (SAR) Rev 0.
This information is required to determine compliance with Title 10 of the Code of Federal Regulations (10 CFR) 71.33(a)(5)(ii).
SHIELDING EVALUATION Clarify why the fuel qualification tables (FQTs) for the TN Eagle SC with type B neutron shield rings developed from the FQTs of the EOS-37PTH DSC in the TN Eagle LC remain valid for the TN Eagle SC equipped with the type C1 neutron shield rings.
In section 5.6.1.4.4.3 regarding the shielding Ring Type C1, the applicant states that "The maximum radiation dose rates for NCT from the TN Eagle SC equipped with the type C1 neutron shield rings are reported in Table 5.6.1-29 and are compared to the maximum dose rates from the TN Eagle LC reported in Table 5-80, and the TN Eagle SC equipped with the type B neutron shield rings reported in Table 5.6.1-23. These results demonstrate that the maximum radiation dose rates for the TN Eagle SC equipped with the type C1 neutron shield rings are comparable to the TN Eagle SC equipped with the type B neutron shield rings and are conservatively bounded by the maximum dose rates from the TN Eagle LC.
However, the maximum dose rates for TN-LC from Table 5-80 show that the bottom of the Vehicle (Package) Surface is 21.71 mrem/hr, and the maximum dose rates for the TN-EAGLE-SC with Type C1 neutron shield rings from Table 5.6.1-29 is 37.97 mrem/hr.
This comparison shows that TN-LC does not entirely bound the TN-EAGLE-SC.
Therefore, the FQTs for the TN Eagle SC with type B neutron shield rings developed from the FQTs of the EOS-37PTH DSC in the TN Eagle LC are not valid for the TN Eagle SC equipped with the type C1 neutron shield rings.
This information is needed to determine compliance with 10 CFR 71.47.