Irradiation targets for isotope delivery systems

Patent metadata

Field	Value
Publication number	US-9773577-B2
Application number	US-54728209-A
Country	US
Kind code	B2
Filing date	Aug 25, 2009
Priority date	Aug 25, 2009
Publication date	Sep 26, 2017
Grant date	Sep 26, 2017

Abstract

Example embodiments are directed to methods of producing desired isotopes in commercial nuclear reactors and associated apparatuses using instrumentation tubes conventionally found in nuclear reactor vessels to expose irradiation targets to neutron flux found in the operating nuclear reactor. Example embodiments include irradiation targets for producing radioisotopes in nuclear reactors and instrumentation tubes thereof. Example embodiments include one or more irradiation targets useable with example delivery systems that permit delivery into instrumentation tubes. Example embodiments may be sized, shaped, fabricated, and otherwise configured to successfully move through example delivery systems and conventional instrumentation tubes while producing desired isotopes.

First claim

What is claimed is:

1. A method of producing isotopes in a nuclear reactor with an irradiation target delivery system, the method comprising:
placing at least one irradiation target into an irradiation target delivery device, the irradiation target configured to substantially convert to a different daughter product when exposed to a neutron flux in the operating nuclear reactor, the irradiation target including a first irradiation target positioned at a leading end of a target portion of the irradiation target delivery device, the first irradiation target having an end that tapers to the leading edge;
inserting the irradiation target delivery device into an instrumentation tube of a nuclear reactor via a drive system that drives the irradiation target delivery device into the instrumentation tube;
irradiating the at least one irradiation target;
removing the irradiation target delivery device from the nuclear reactor; and
harvesting the daughter product from the irradiation target.

2. The method of claim 1 , wherein the placing the at least one irradiation target into the irradiation target delivery device includes attaching the irradiation target to a wire, and pushing the wire through a first guide and into the instrumentation tube using the drive system.

3. The method of claim 1 , wherein the at least one irradiation target further includes a second irradiation target positioned behind the first irradiation target from the leading end, the second irradiation target configured to removably join to a driving portion of the delivery device.

4. The method of claim 3 , wherein the at least one irradiation target further includes at least one third irradiation target positioned between the first and the second irradiation targets, and wherein the first, the second, and the third irradiation targets are cylindrical and have a substantially similar outer diameter.

5. The method of claim 2 , wherein,
the placing of the at least one irradiation target into the irradiation target delivery device includes,
pushing the wire through the first guide and into a loading area,
placing the at least one irradiation target into the irradiation target delivery device in the loading area,
pulling the wire back out of the first guide,

the inserting of the irradiation target delivery device into the instrumentation tube includes,
pushing the wire back through the first guide and into the instrumentation tube after the at least one irradiation target is in the irradiation target delivery device.

6. The method of claim 5 , further comprising:
selecting between at least two positions on the first guide, a first position of the first guide allowing the wire to travel between the first guide and the loading area, and a second position of the first guide allowing the wire to travel between the first guide and the instrumentation tube.

7. The method of claim 5 , wherein the inserting of the irradiation target delivery device into the instrumentation tube further includes,
pushing the irradiation target delivery device through a second guide located downstream of the first guide,
selecting between at least two positions on the second guide, a first position of the second guide allowing the wire to travel between the second guide and the instrumentation tube, and a second position allowing a second drive system to drive a cable between the second guide and the instrumentation tube while impeding the wire from traveling between the second guide and the instrumentation tube.

8. the method of claim 7 , wherein,
tubing segments exist between the drive system and the first guide, the first guide and the second guide, and the second guide and the instrumentation tube,
the inserting of the irradiation target delivery device into the instrumentation tube further includes,
pushing the irradiation target delivery device through the tubing segments using the drive system.

Assignees

• Rickard David Allan
• Bloomquist Bradley
• Allen Melissa
• Gilman Nicholas R
• Bowie Jennifer M
• Russell Ii William Earl
• Ge Hitachi Nuclear Energy Americas Llc

Inventors

• Rickard David Allan
• Bloomquist Bradley
• Allen Melissa
• Gilman Nicholas R
• Bowie Jennifer M
• Russell Ii William Earl

Classifications

• G21G1/02 Primary

  in nuclear reactors (by thermonuclear reactions G21B; conversion of nuclear fuel G21C) · CPC title

• Y02E30/30

  Nuclear fission reactors · CPC title

• G21G1/0005 Primary

  Isotope delivery systems (use of radioisotopes as tracers G21H5/02) · CPC title