The U.S. Nuclear Regulatory Commission (NRC) is amending its spent fuel storage regulations by revising the Holtec International HI- STORM Flood/Wind (FW) System listing within the "List of approved spent fuel storage casks" to include Amendment No. 10 to Certificate of Compliance (CoC) No. 1032. Amendment No. 10 revises the CoC for the HI-STORM FW dry storage system to incorporate several enhancements. These changes include the introduction of the HI-STORM FW Extended Configuration, adoption of a methodology for developing site-specific loading patterns with higher allowable per-canister and per-cell heat- load limits, incorporation of a radiological fuel-qualification methodology, reduction of minimum cooling-time requirements for certain multi-purpose canister models based on updated evaluations, and refinement of the missile-impact analysis methodology to allow site- specific credit for the HI-TRAC VW water-jacket shell. The amendment also includes a minor editorial clarification.