Patent ID: 8634514

Claim:
A containment enclosure for processing or storing material containing civilian or military origin plutonium in the form of plutonium oxide, plutonium carbide or plutonium nitride, said containment enclosure comprises a perimeter and a bottom, said containment enclosure being dimensioned to enclose a vessel having a predetermined volume and provided for storing said material, said containment enclosure comprises at its bottom a bottom catcher comprising a plurality of sub-critical spaces which are separated by passive parts forming separators and provided for catching spilt plutonium-containing material, each one of said sub-critical spaces define a space and a volume and is demarcated by at least two substantially parallel and vertical walls having a height (h) between 30 and 50 cm, and separated by a distance e between 8 and 12 cm, said sub-critical spaces being provided to be filled with a solid, mineral and neutron-absorbing material, said bottom catcher being dimensioned to retain a further volume being at least equal to said predetermined volume.