# List of Approved Spent Fuel Storage Casks: NUHOMS ® HD System Revision 1
> **Nuclear Regulatory Commission** · Direct final rule. · Published 2011-01-13 · Effective 2011-03-29 · 76 FR 2243
## Document
- **Document number:** 2011-642
- **Category:** nuclear-waste
- **Sub-agency:** Nuclear Regulatory Commission
- **Federal Register citation:** 76 FR 2243
- **CFR reference:** 10 CFR 72
- **Publication date:** 2011-01-13
- **Effective date:** 2011-03-29
- **Energy docket:** NRC-2011-0002
## Abstract

The Nuclear Regulatory Commission (NRC or the Commission) is amending its spent fuel storage regulations by revising the Transnuclear, Inc. (TN) NUHOMS [supreg] HD System listing within the "List of Approved Spent Fuel Storage Casks" to include Amendment No. 1 to Certificate of Compliance (CoC) Number 1030. Amendment No. 1 will revise the definitions for Damaged Fuel Assembly and Transfer Operations; add definitions for Fuel Class and Reconstituted Fuel Assembly; add Combustion Engineering 16x16 class fuel assemblies as authorized contents; reduce the minimum off-normal ambient temperature from -20 [deg]F to -21 [deg]F; expand the authorized contents of the NUHOMS [supreg] HD System to include pressurized water reactor fuel assemblies with control components; reduce the minimum initial enrichment of fuel assemblies from 1.5 weight percent uranium-235 to 0.2 weight percent uranium-235; clarify the requirements of reconstituted fuel assemblies; add requirements to qualify metal matrix composite neutron absorbers with integral aluminum cladding; clarify the requirements for neutron absorber tests; delete use of nitrogen for draining the water from the dry shielded canister (DSC), and allow only helium as a cover gas during DSC cavity water removal operations; and make corresponding changes to the technical specifications (TS).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2011/01/13/2011-642/list-of-approved-spent-fuel-storage-casks-nuhoms--hd-system-revision-1)
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