ML26048A272
| ML26048A272 | |
| Person / Time | |
|---|---|
| Site: | 07109261 |
| Issue date: | 02/26/2026 |
| From: | Storage and Transportation Licensing Branch |
| To: | |
| References | |
| EPID L-2025-LLA-0119, CAC 000129 | |
| Download: ML26048A272 (0) | |
Text
Enclosure Request for Additional Information HI-STAR 100 Model Docket No. 72-9261 Amendment 14 By letter August 1, 2025, (Agencywide Documents Access and Management System [ADAMS]
Accession No. ML25213A096, Holtec International (Holtec or the applicant) requested the U.S.
Nuclear regulatory Commission (NRC) amendment 14 to Certificate of Compliance (CoC) No.
9261 for the HI-STAR 100 Model. By letter dated September 15, 2025, I acknowledged acceptance of your application for a detailed technical review and provided a schedule for the U.S. Nuclear Regulatory Commission (NRC) review (ADAMS Accession No. ML25272A106). By letter dated December 10, 2025, I provided an updated schedule for the NRC review (ADAMS Accession No. ML25345A188). This request for additional information (RAI) identifies information needed by the NRC staff in connection with its technical review of the renewal application. The requested information is listed by chapter number and title in the renewal application. The staff used guidance in NUREG-2224 and NUREG-2216, Standard Review Plan for Transportation Packages for Spent Fuel and Radioactive Material in its review of the renewal application.
Each individual RAI describes information needed by the staff for it to complete its review of the renewal application and to determine whether the applicant has demonstrated compliance with the regulatory requirements.
RAI-Structural-1.
Justify or revise the source of the value for the MPC-32 high burnup fuel cladding material yield stress added in Table 2.9.2 of safety analysis report (SAR) HI-951251, Application HI-STAR 100 Transportation (10CFR71), Revision 21, and identify the cladding material, temperature and strain rate for the evaluation.
The reference for the yield stress value of 600 MPa for the MPC-32 high burnup fuel cladding appears to be taken from a sample true stress-strain curve shown in SAR reference 2.9.4, PNNL-17700, PNNL Stress/Strain Correlation for Zircaloy, by Geelhood et al, dated 2008.
However, a yield stress value is required that corresponds to the cladding material, temperature and strain rate at which it is being evaluated in order to compare the value employed in the original analysis, as discussed in SAR section 2.9.
This information is required to satisfy the requirements of 10 CFR 71.73(c).
RAI-Materials-1 Provide justification for the Short Term Operations Temperature Limit and the Accident Condition Temperature Limit for Holtite-A in Table 3.3.1. The previous revision of this table listed no temperature limit for Holtite-A for short term or accident conditions, assuming the Holtite would be lost in a fire. The listed temperature is the same as that for aluminum 5052 and over three times the Normal Condition Temperature Limit for Holtite-A. Staff requires the rationale for this temperature limit to assess the applicants evaluation of the performance of the material.
This information is necessary to demonstrate compliance with 10 CFR 71.43(f), 71.51(a)(1), and 71.55(d).
2 Editorial Comment The Short Term Operations Temperature Limit for high burnup fuel (HBF) cladding in Table 3.3.1 appears to be a typographical error. It is half the Normal Condition Temperature Limit and is not consistent with values listed in section 3.4, Thermal Evaluation for Normal Conditions of Transport, of the SAR.