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 (Circulation of 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 chem reaction with fuel cladding / corrosion
• 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

When does the Loading Operations begin and end with MPC?

Answer 5

From first fuel assembly in the MPC to when the TRANSFER CASK is suspended from / secured on the TRANSPORTER.

Question 6

When does Transfer Operations begin and end?

Answer 6

begins when TRANSFER CASK is on the TRANSPORTER to when the TRANSFER CASK is at its destination and released from the TRANSPORTER.

Question 7

If you damage a cask confinement boundary as indicated by on contact rad readings, what is your Eplan Call?

Answer 7

Unusual Event EU1.1

Question 8

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

Answer 8

1. HI-STORM Overpack
2. Multi- Purpose Canister (MPC) – holds 32 fuel ass
3. Hi-TRAC Transfer

Question 9

What is the purpose of the Certificate of Compliance (CoC)?

Answer 9

Approves the design of the Dry Cask storage system

Tech Specs for ISFSI are found in CoC

Question 10

Do you have to enter a spec if Temperature Monitoring System is working and the Delta T’s are within limits if you have blockage identified?

Answer 10

NO!
But should still prioritize removal of blockage