Those areas of the facility where SNM is stored (e.g., plutonium product storage)
should be located in the least accessible (to an intrusion force) area of the plant.
Design of storage tanks for aqueous solutions of plutonium should ensure that
they are geometrically favorable with respect to nuclear criticality. When there is
a tendency for solids to precipitate, vessels should be instrumented to detect the
build-up of solids and designed to facilitate removal of solids.
The ventilation system should be designed to provide adequate heat rejection
capacity. DOE-STD-3013, Criteria for Preparing and Packaging Plutonium
Metals and Oxides for Long-Term Storage, provides guidance regarding
containers for storage of plutonium oxide and metal containing greater than 50
Suitable physical compartmentalization should be considered to limit the quantity
of stored materials in each compartment to safe levels, to provide the necessary
access features and controls, and satisfy loss limitation criteria.
Cautionary systems (e.g., visual or audible alarms or other warning systems) or
interlocks should be considered to prevent inadvertent entry into hazardous
areas. Safety alarm systems should annunciate inside and outside the PSF to
identify hazardous areas to anyone present in either area. The need for visual
alarm devices within the facility, in addition to audible alarm devices, should be
Storage racks should be noncombustible and designed to hold storage
containers securely in place, maintain proper separation of storage containers,
and maintain structural integrity under normal operational conditions, anticipated
events, and accident conditions.