# List of Approved Spent Fuel Storage Casks: NAC International, Inc. MAGNASTOR® Storage System, Certificate of Compliance No. 1031, Amendment No. 9
> **Nuclear Regulatory Commission** · Direct final rule. · Published 2020-09-22 · Effective 2020-12-07 · 85 FR 59395
## Document
- **Document number:** 2020-20666
- **Category:** nuclear-waste
- **Sub-agency:** Nuclear Regulatory Commission
- **Federal Register citation:** 85 FR 59395
- **CFR reference:** 10 CFR 72
- **Publication date:** 2020-09-22
- **Effective date:** 2020-12-07
- **Energy docket:** NRC-2020-0166
## Abstract

The U.S. Nuclear Regulatory Commission (NRC) is amending its spent fuel storage regulations by revising the NAC International, Inc. MAGNASTOR[supreg] Storage System listing within the "List of approved spent fuel storage casks" to include Amendment No. 9 to Certificate of Compliance No. 1031. Amendment No. 9 revises the certificate of compliance to add a new concrete storage overpack; four new heat load zone patterns and their associated decay heats that are specific to Babcock and Wilcox 15x15 fuel assemblies; a new Babcock & Wilcox 15x15 hybrid fuel assembly type (BW15H5); and a new maximum enrichment for the BW15H2 hybrid fuel assembly, including a new minimum soluble boron concentration during loading and unloading operations and neutron absorber areal density. In addition, Amendment No. 9 makes non- technical changes to reorganize Appendix B of the technical specifications. These changes are discussed in more detail in the "Discussion of Changes" section of this direct final rule.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/09/22/2020-20666/list-of-approved-spent-fuel-storage-casks-nac-international-inc-magnastor-storage-system-certificate)
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