The MAGNASTOR System: The New Generation in Multipurpose Storage

 
The future of dry spent fuel storage has arrived. The NAC Modular, Advanced Generation, Nuclear All-purpose Storage (MAGNASTOR®) System is the first U.S. NRC certified high capacity multipurpose spent fuel storage technology, capable of storing 37 PWR or 87 BWR spent fuel assemblies. Drawing upon lessons learned from designing and licensing three earlier dual/multipurpose technologies, and from fabricating, constructing, and loading over 200 of these earlier multipurpose canister systems (MCS), NAC has developed the MAGNASTOR System to provide improved capacity, thermal performance, operations, and fuel coverage for the growing number of nuclear facilities requiring dry spent fuel storage. MAGNASTOR is a new generation MCS, incorporating lessons learned while considering the handling capabilities of plants requiring dry storage.
MAGNASTOR incorporates unique design, fabrication, and operations features. Among these are:
  • a developed cell basket design that offers the highest spent fuel capacities and simplifies fabrication, while providing high strength and heat removal of up to 35.5 kW
  • a unqiue canister closure design that can improve welding time, reduce personnel dose, and enhance drying performance 
  • a low profile vertical concrete cask design to improve on-site handling and site dose rates, while providing proven, simple construction operation features and maintaining robustness against beyond-design-basis threats
  • a simple, proven transfer system that facilitates transfer without excessive dose or handling
  • a new approach to water removal and canister drying that shortens operation times.

 

 

 
MAGNASTOR System
Key Design Parameters

Fuel Specific Data

PWR/BWR
Maximum Assembly Capacity

37/87
Thermal Capacity (Storage)

35.5 kW/33 kW, max.
                           (Transport)

24 kW max.
Fuel Cool Time     (Storage)

4 yr min.
                           (Transport)

To meet max. heat load limits
Fuel Initial Enrichment

5.0 w/o /4.5 w/o, U235 max.
Fuel Burnup  (Assembly Avg)

60 GWD/MTU max.

Key System Dimensions

PWR/BWR
VCC Length - Standard

225 inches
                     Segmented Body

204 inches
VCC Outer Diameter

136 inches
Canister Cavity Length

Type 1/3 - 173 inches
 

Type 2/4 - 180 inches
Internal Cavity Diameter

72 inches
Overall Canister Length

Type 1/3 - 185 inches
 

Type 2/4 - 192 inches
Canister Shell Thickness

0.5 inches
Max Weight on Crane Hook

114 tons/115 tons
Max Weight on ISFSI Pad

160 tons/161 tons