# List of Approved Spent Fuel Storage Casks: Holtec International HI-STORM Flood/Wind Multipurpose Canister Storage System, Certificate of Compliance No. 1032, Amendment No. 5
> **Nuclear Regulatory Commission** · Direct final rule. · Published 2020-05-13 · Effective 2020-07-27 · 85 FR 28479
## Document
- **Document number:** 2020-10087
- **Category:** nuclear-waste
- **Sub-agency:** Nuclear Regulatory Commission
- **Federal Register citation:** 85 FR 28479
- **CFR reference:** 10 CFR 72
- **Publication date:** 2020-05-13
- **Effective date:** 2020-07-27
- **Energy docket:** NRC-2020-0050
## Abstract

The U.S. Nuclear Regulatory Commission (NRC) is amending its spent fuel storage regulations by revising the Holtec International HI- STORM Flood/Wind Multipurpose Canister Storage System listing within the "List of approved spent fuel storage casks" to include Amendment No. 5 to Certificate of Compliance No. 1032. Amendment No. 5 revises the certificate of compliance to: Add new heat load patterns and revise the minimum required cooling time for two multipurpose canisters MPC-89 and MPC-37; add new fuel types to the approved contents; allow an exception to a code to permit use of certain duplex stainless steels; use an analysis model to revise the calculation for evaluating effective fuel conductivities; add the use of the damaged fuel isolator; add two versions of the standard variable weight transfer cask; add the option of using cyclic vacuum drying; and make changes to the final safety analysis report to add new types of fuel assemblies, add a definition to it and to the certificate of compliance, and add the required shielding evaluation to Section 5.4.8. In addition, Amendment No. 5 makes several clarifications and minor changes. 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/2020/05/13/2020-10087/list-of-approved-spent-fuel-storage-casks-holtec-international-hi-storm-floodwind-multipurpose)
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