The design should also consider the inclusion of filters capable of being
either remotely back-flushed or designed so that cartridges can be
removed directly into a shielded container. Instrumentation for periodic
functional testing of the pool-water cleanup system and heat-exchanger
performance should be considered. The design should use containerized
or modularized filters to reduce exposure during maintenance. Filter
change-out prior to build-up of radiation levels should be considered.
The normal water level of the storage pool should be at or near the final
design grade level. The water level necessary for in-storage radiation
shielding should be at or below grade.
For water-pool type facilities, the design professional should consider
providing the pool liner with a leakage collection system that will allow
leakage detection and limit absorption of contaminated pool water by
A system should be incorporated to detect leakage from stored IFM in the
event of a cladding or canning failure that could allow the escape of
fission products and other radioactive material greater than specified
limits. This system should include the following:
Sampling of coolant allows identification of an individual leaking
System components, piping, and instrumentation are appropriately
shielded to maintain operator exposures within guidelines and use
ALARA design principles to minimize overall exposures.
The storage facility provides for the temporary storage of a leaky
assembly. These provisions should limit the spread of
contamination by a leaky assembly and provide adequate cooling
and shielding of the assembly.