ANSI ANS 57.3:2018 pdf download.Design Requirements for New Fuel Storage Facilities at Light Water Reactor Plants.
ANSI ANS 57.3 defines the required functions of dry storage facilities for new fuel at light water reactor nuclear power plants. It provides minimum design requirements for safe storage of new nuclear fuel and control components at such plants. The fuel storage facilities covered by this standard are used for receiving, inspecting, and storing fuel containing new and recycled uranium and mixed oxides. The basis of this standard is to ensure that the design of the facility will be performed in an efficient and economical manner to (a) preclude criticality; (h) ensure protection of new fuel assemblies, control components, plant personnel, and the public; and (c) maintain radiation exposures As Low As Reasonably Achievable (ALARA). Storage of new fuel assemblies in a spent fuel pooi is covered in ANS-57.2-1983 (withdrawn)
2 Acronyms and definitions
2.1 Acronyms
ALARA: As Low As Reasonably Achievable
SSCs: structures, systems, and components
SSE: safe shutdown earthquake
2.2 Shall, should, and may
shall, should, and may: The word “shall” is used to denote a requirement; the word “should” is used to denote a recommendation; and the word “may” is used to denote permission, neither a requirement nor a recommendation.
2.3 Definitions
cell: A unit for storage of an individual fuel assembly. It is a subassembly of a storage rack.
control components: Components that control coolant flow or reactivity and may be handled or shifted in position during fuel loading or refueling. Examples are control rods, flow-limiting components, and burnable absorbers.
fuel handling equipment: Equipment used for moving new fuel during receipt and inspection. transporting to storage in-plant, and loading this fuel and control components in the reactor.
latching: Physically attaching a tool to a fuel assembly or control component in such a manner as to preclude accidental release.
mixed-oxide (MOX) fuel: A type of nuclear fuel that contains plutonium oxide mixed with uranium oxide.
natural phenomena: Environmental conditions external to a plant that are not manmade, some examples of which are earthquakes, tornadoes, flooding, lightning, hurricanes, snow, and ice. (Natural phenomena accommodated by nuclear power plant design criteria are termed “natural hazards.”)
new fuel: A nuclear fuel assembly that has not been used for power generation.
new fuel elevator: Equipment usually installed in the spent fuel pool or fuel transfer canal to allow new fuel, from either a shipping container, a new fuel inspection stand, or the new fuel storage racks, to be lowered for handling by the fuel handling equipment.
new fuel storage rack enclosure: The boundary structures of the new fuel storage facility that protect the new fuel from the environment and from damage, theft, and sabotage. Such an enclosure may consist of a vault around the racks, a covered storage room or an open storage pit housed in a building, or an entire building in which the new fuel is being stored.
optimal (optimum) moderation: The moderation condition that yields the highest effective neutron multiplication factor.
rack: A structure consisting of an assembly of cells.ANSI ANS 57.3 pdf download.