Cask and method of producing neutron shield

A cask comprising:

• a cask body having a tubular shape with a central axis as a center and capable of housing a fuel assembly;
• a tubular outer cylinder surrounding said cask body;
• a plurality of fins aligned in a circumferential direction in a tubular space formed between said cask body and said outer cylinder, and connecting an outer peripheral surface of said cask body and an inner peripheral surface of said outer cylinder to divide said tubular space into a plurality of divided spaces;
• and
• a plurality of neutron shields containing a neutron shielding material with which said plurality of divided spaces is filled, wherein
• each neutron shield includes:
• a molded pipe portion including a hollow portion that is a void portion that extends in an axial direction along said central axis;
• and
• a filled portion serving as the neutron shielding material with which a space between said molded pipe portion and an outer edge of a divided space is filled, and
• said molded pipe portion is surrounded by the neutron shielding material of said filled portion.

A method of producing a neutron shield in a cask,

• said cask including:
• a cask body having a tubular shape with a central axis as a center and capable of housing a fuel assembly;
• a tubular outer cylinder surrounding said cask body;
• and
• a plurality of fins aligned in a circumferential direction in a tubular space formed between said cask body and said outer cylinder, and connecting an outer peripheral surface of said cask body and an inner peripheral surface of said outer cylinder to divide said tubular space into a plurality of divided spaces,
• the method of producing said neutron shield, comprising:
• disposing a molded pipe portion in a divided space, said molded pipe portion including a hollow portion that is a void portion extending in an axial direction along said central axis;
• and
• forming a filled portion by filling a space between said molded pipe portion and an outer edge of said divided space with a neutron shielding material with fluidity and hardening said neutron shielding material, wherein
• said void portion is surrounded by a neutron shielding material forming said molded pipe portion.