The fuel plates within the core are cladded with which material?

The fuel plates within the core are cladded with which material?

• A. Magnesium alloy
• B. Aluminum 6061
• C. Stainless Steel
• D. Graphite

Answer: (B)

Fuel plates are clad with a material that minimizes neutron absorption while efficiently transferring heat and resisting the reactor coolant environment. Aluminum alloys fit this role well, and aluminum 6061 is a common pick because it combines low neutron absorption with excellent thermal conductivity, good corrosion resistance, and good manufacturability into thin cladding. It also pairs well with the uranium-aluminum fuel forms used in many plate designs. Other materials don’t fit as neatly: magnesium alloys are highly reactive with water and air, posing safety and corrosion concerns; graphite is a moderator, not a cladding material; stainless steel, while strong, increases neutron absorption and adds weight, which is disadvantageous for neutron economy and heat transfer in many plate designs.

Fuel plates are clad with a material that minimizes neutron absorption while efficiently transferring heat and resisting the reactor coolant environment. Aluminum alloys fit this role well, and aluminum 6061 is a common pick because it combines low neutron absorption with excellent thermal conductivity, good corrosion resistance, and good manufacturability into thin cladding. It also pairs well with the uranium-aluminum fuel forms used in many plate designs.

Other materials don’t fit as neatly: magnesium alloys are highly reactive with water and air, posing safety and corrosion concerns; graphite is a moderator, not a cladding material; stainless steel, while strong, increases neutron absorption and adds weight, which is disadvantageous for neutron economy and heat transfer in many plate designs.