# List of Approved Spent Fuel Storage Casks: TN-68 Revision 1
> **Nuclear Regulatory Commission** · Direct final rule. · Published 2007-08-16 · Effective 2007-10-30 · 72 FR 45880
## Document
- **Document number:** E7-16134
- **Category:** nuclear-waste
- **Sub-agency:** Nuclear Regulatory Commission
- **Federal Register citation:** 72 FR 45880
- **CFR reference:** 10 CFR 72
- **Publication date:** 2007-08-16
- **Effective date:** 2007-10-30
## Abstract

The Nuclear Regulatory Commission (NRC) is amending its spent fuel storage cask regulations by revising the Transnuclear, Inc. TN-68 dry storage cask system listing within the "List of Approved Spent Fuel Storage Casks" to include Amendment No. 1 to Certificate of Compliance (CoC) Number 1027. Amendment No. 1 will modify the CoC by revising several fuel parameters that include increasing fuel burnup to 60 gigawatts-day/metric ton of uranium, increasing total cask decay heat to 30 kilowatts, increasing maximum average fuel enrichment to 4.7 weight percent uranium-235, and decreasing minimum fuel assembly cooling time to 7 years. Amendment No. 1 will also add up to eight damaged fuel assemblies as authorized contents of the cask and reduce the cask spacing on the storage pad.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2007/08/16/E7-16134/list-of-approved-spent-fuel-storage-casks-tn-68-revision-1)
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