Quantcast Criticality Safety Evaluation for Storage of BORAX V on CPP-603 North and Middle Basin Floor

 

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Description


DOE-STD-3007-93
Criticality Safety Evaluation for
Storage of BORAX V on
CPP-603 North and Middle Basin Floor
The purpose of this evaluation is to provide a basis to store BORAX V Superheater fuel in
the Idaho Chemical Processing Plant (ICCP) Building 603 north and middle basins, with no
spacing restrictions between fuel storage buckets within a single row. As a result of the age and
degradation of the Building 603 fuel storage facility, failure of a BORAX V fuel storage bucket
hanger occurred in July 1992, thus causing the loaded storage bucket to fall to the floor. Due to
the lower reactivity of BORAX V Superheater fuel, there exists a possibility that the spacing
provided at one time by the basin monorail fuel storage system might not be necessary. If this
spacing is deemed unnecessary, the definition of approved storage for BORAX V fuel elements
could possibly be changed to eliminate the requirement for spacing within a given row. The
redefinition of approved storage would entail the placement of storage buckets, containing three
or fewer BORAX V Superheater fuel elements, onto the basin floor. This redefinition would
apply only to rows exclusively containing BORAX V Superheater fuel elements. With this
redefinition all spacing restrictions between storage buckets could be removed.
Considered in this evaluation are various arrangements of BORAX V Superheater fuel
assemblies within a single storage row. Only BORAX V Superheater fuels are considered in this
evaluation.
The Building 603 fuel storage facility consists of three underwater storage basins, the
north, middle, and south. (See Figure 1).1 The south storage basin consists of a series of storage
racks. The two basins of concern are the north and middle basins, since those basins contain the
monorail fuel storage system. The north and middle basins are 40 feet (12.2 m) by 60 feet (18.3
m), with a water depth of 21 feet (6.4 m). The middle and north basins consist of a series of
2-7


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