Dry Cask Storage - 1.0

Question 1

What are the cask system design functions?

Answer 1

1. Structural - Withstand lifting, handling, internal pressure, external pressure, thermal stresses, off-normal and accident conditions
2. Thermal - Completely passive cooling system relying on Natural Circulation inside the MPC and Chimney effect venting on the HI-Storm. Maintains Peak Cladding Temperature < 752F
3. Criticality - Maintains the spent fuel assemblies in a subcritical condition.
4. Confinement – Separates the radiological components and storage gasses
5. Shielding - HI-TRAC during loading and handling operations, HI-STORM for interim storage on ISFSI
6. Operation - Can be placed in the SFP, loaded, recovered, sealed, drained, dried with a vacuum drying system, backflilled with Helium, lead tested and placed into storage w/o damaging plant equipment, contained spent fuel assemblies, dry storage system, or endangering personnel.q

Question 2

What are the components of the dry casks and their purpose?

Answer 2

1. Multi-Purpose Canister (MPC) – Stores the spent fuel assemblies.
2. Hi-Storm 100 Overpack - Holds the MPC
3. Hi-TRAC Transfer Cask – Holds the MPC during movement.

Question 3

With regards to the dry casks, how many bundles can they hold?

Answer 3

68

Question 4

With regards to the dry casks, how are they cooled?

Answer 4

natural circulation around the MPC

Question 5

With regards to the dry casks, how is criticality prevented?

Answer 5

Boron within the panels of the MPC basket