System and process for production and collection of radioisotopes
A means for installing material, through a fuel assembly instrument thimble insert, into the existing instrument thimbles in nuclear fuel assemblies for the purpose of allowing the material to be converted to commercially valuable quantities of desired radioisotopes during reactor power operations during a remainder of a fuel cycle and removing the radioisotopes from the core through the reactor flange opening once the fuel assemblies have been removed for refueling. The invention also describes methods that can be used to harvest the irradiated material so it can be packaged for transportation from the reactor to a location where the desired radioisotope(s) can be extracted from the fuel assembly instrument thimble insert.
1. A nuclear fuel assembly flux thimble insert comprising:
an elongated tubular housing having an axis along its elongated dimension,
the elongated tubular housing being
closed at a forward end and
capped at a rearward end
to form a target specimen chamber there between within an interior of the elongated tubular housing,
the elongated tubular housing being sized to slide within an instrument thimble of a nuclear fuel assembly,
with the rearward end structured to be driven by a drive cable of an existing moveable in-core detector system; and
an elongated target specimen captured between a forward axial position plug and a rear axial position plug,
wherein the axial position plugs extend across the interior of the elongated tubular housing,
wherein the axial position plugs are structured to seat against an interior wall of the elongated tubular housing
to hold the target specimen at a preselected axial position within the interior of the elongated tubular housing,
wherein the target specimen is nuclear reactor transmutable to produce at least one commercial radioisotope.
2. The nuclear fuel assembly flux thimble insert of claim 1 , wherein the at least one commercial radioisotope comprises one or more of Co-60, W-188, Ni-63, Bi-213, and Ac-225.
3. The nuclear fuel assembly flux thimble insert of claim 1 , wherein the elongated tubular housing is constructed from zirconium or a zirconium alloy.
4. The nuclear fuel assembly flux thimble insert of claim 1 , wherein the axial position plugs maintain their axial position due to friction between interfacing surfaces on the axial position plugs and the interior wall of the elongated tubular housing.
5. The nuclear fuel assembly flux thimble insert of claim 1 , wherein the axial position plugs maintain their axial position by fitting in slight recesses in the interior wall of the elongated tubular housing.
6. The nuclear fuel assembly flux thimble insert of claim 5 , wherein the axial position plugs have an upper and lower surface that extends substantially orthogonal to the axis with an outer, substantially circular wall extending between the upper and lower surface, wherein the axial dimension of the outer, substantially circular wall is sized to fit in one of the recesses.
7. The nuclear fuel assembly flux thimble insert of claim 6 , wherein the interface of the upper and lower surfaces with the outer, substantially circular wall are slanted at an acute angle to facilitate lodging and dislodging of the axial position plugs from the recesses.