Dry Cask Storage

Question 1

What provides the confinement boundary for the spent nuclear fuel from the environment?

Answer 1

• The MPC (Baseplate, Shell, Lid, and closure ring)

Question 2

What are the 3 types of heat transfer for the MPC?

Answer 2

• Conduction (Through the metal)
• Convection (Helium)
• Radiated (through the shell and top)

Question 3

Why do we use helium in the MPC?

Answer 3

• Leak detection
• Inert atmosphere to prevent cladding corrosion (Chem Reaction)
• Cooling (Convection)

Question 4

What are the functions of the MPC?

Answer 4

• Structural
• Nuclear criticality
• Confinement boundary
• Heat removal
• Shielding
• Fluid penetrations

Question 5

What is the Time-to-Boil Contingency for the MPC with fuel in it?

Answer 5

• Required if within 4 hours of TTB
• Water Circulation System (WCS) is used
  Circulate SFP water through the MPC
• SFP water is pumped into the drain port
• Returned to SFP from the vent port
• Then Recalculate TTB

Question 6

When does the Loading Operations begin and end with MPC?

Answer 6

• LOADING OPERATIONS begin when the first fuel assembly is placed in the MPC
  AND
• ends when the TRANSFER CASK is suspended from or secured on the transporter.

Question 7

When does Transfer Operations begin and end?

Answer 7

• TRANSPORT OPERATIONS begin when TRANSFER CASK is first suspended from or secured on the transporter
  AND
• ends when the TRANSFER CASK is at its destination and no longer secured on or suspended from the transporter.

Question 8

If you compromise the MPC, what must you enter?

Answer 8

• An Unusual Event

Question 9

What does 10CFR72 State?

Answer 9

• NRC confers approval of a dry storage system design via granting a Certificate of Compliance

Question 10

What does the HI-Storm 100 Cask System consist of?

Answer 10

• MPC, HI-TRAC transfer Cask, and HISTORM storage overpack