CSER 96-028: PFP vault number 2 storage racks

A nuclear criticality safety analysis has been performed to increase the approved plutonium mass limit for the Vault {number_sign}2 storage racks at PFP. There are three racks in the room with separate cubicles used to hold cans of plutonium oxide (PuO,). The racks were approved to hold up to 2.5 Kg of plutonium in each storage cubicle. The purpose of this CSER is to increase the limit to 4.4 Kg plutonium in PuO, per storage cubicle in one rack. The highest k{sub eff} calculated for all possible scenarios was 0.893 {+-} 0.003, which is well below the criticality safety limit of k{sub eff}= 0.935. Consequently, an increase of plutonium mass to 4.4 Kg per can is within acceptable safety limits