# US 11,309,092 B2 · Target irradiation systems for the production of radioisotopes

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- Number: US 11,309,092 B2
- Document ID: US11309092B2
- Status: Granted
- Kind: B2
- Application number: 16/551,185
- Filed: 2019-08-26
- Published: 2020-03-19
- Granted: 2022-04-19
- Earliest claimed: 2018-08-27
- Assignees: BWXT Isotope Technology Group, Inc.
- Applicants: BWXT Isotope Technology Group, Inc.
- Inventors: Thomas G. Onderwater; Mark A. Alboino; Benjamin D. Fisher; Andrew F. Long
- Web page: https://patentgrep.com/patent/US11309092B2

## CPC

- G21G 1/02: in nuclear reactors (by thermonuclear reactions G21B; conversion of nuclear fuel G21C)
- G21C 1/303: {Experimental or irradiation arrangements inside the reactor (irradiation loops G21C1/306)}
- G21C 23/00: Adaptations of reactors to facilitate experimentation or irradiation
- G21G 1/001: {Recovery of specific isotopes from irradiated targets}
- G21G 1/08: accompanied by nuclear fission
- G21G 2001/0036: {Molybdenum}
- G21K 5/08: Holders for targets or for other objects to be irradiated
- Y02E 30/30: Nuclear fission reactors
- G21G: CONVERSION OF CHEMICAL ELEMENTS; RADIOACTIVE SOURCES (applications of radiation in general G21H5/00; handling particles, e.g. neutrons, or electromagnetic radiation not otherwise provided for G21K)
- G21C: NUCLEAR REACTORS (fusion reactors, hybrid fission-fusion reactors G21B; nuclear explosives G21J)
- G21K: HANDLING OF PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A target irradiation system for irradiating a radioisotope target in a vessel penetration of a fission reactor, including a target elevator assembly including a body portion defining a central bore and an open bottom end, a center tube that is disposed within the central bore of the body portion, a target basket that is slidably receivable within the center tube, and a winch that is connected to the target basket by a cable, wherein the target basket is configured to receive the radioisotope target therein and be lowered into the vessel penetration of the reactor when irradiating the radioisotope target.

## Claims

### Claim 1

A target irradiation system for irradiating a radioisotope target in a vessel penetration of a fission reactor having a pressure boundary, comprising:
a target elevator assembly including a body portion defining a central bore and an open bottom end, a center tube that is disposed within the central bore of the body portion and defines a central bore, a target basket including a cylindrical sidewall defining a central bore and a bottom flange, the target basket being slidably receivable within the center tube, and a cable drive assembly that is connected to the target basket by a cable, the target elevator assembly being mounted to the vessel penetration of the reactor; and
a target passage that is in fluid communication with the target elevator assembly,
wherein the target basket is configured to receive the radioisotope target therein via the target passage and be lowered through the vessel penetration into the reactor when irradiating the radioisotope target, the target elevator assembly forms a portion of the pressure boundary of the reactor when in fluid communication with the reactor, the target basket is movable between a first position in which the target basket is disposed within the central bore of the center tube and a second position in which the target basket is disposed within the fission reactor, and the bottom flange of the target basket forms a seal with a bottom of the center tube when the target basket is in the first position.

### Claim 2 (depends on 1)

The target irradiation system of claim 1, wherein the fission reactor is a heavy-water moderated fission reactor.

### Claim 3 (depends on 2)

The target irradiation system of claim 2, wherein the radioisotope target is comprised of natural molybdenum.

### Claim 4 (depends on 1)

The target irradiation system of claim 1, wherein the target elevator assembly is mounted to the vessel penetration so that a portion of the body portion of the target elevator assembly extends downwardly into the vessel penetration.

### Claim 5 (depends on 1)

The target irradiation system of claim 1, wherein the cylindrical side wall of the target basket includes a plurality of apertures so that a moderator fluid of the fission reactor may enter the target basket when the target basket is in the second position and disposed in the fission reactor.

### Claim 6

A target irradiation system for irradiating a radioisotope target in a vessel penetration of a fission reactor including a pressure boundary, comprising:
a target elevator assembly including a body portion defining a central bore and an open bottom end, a center tube that is disposed within the central bore of the body portion and defines a central bore having a bottom surface, a target basket including a cylindrical sidewall and a bottom flange, the target basket being movable between a first position in which the cylindrical sidewall of the target basket is disposed within the central bore of the center tube and a second position in which the target basket is disposed within the fission reactor; and
a target passage that is in fluid communication with the target elevator assembly,
wherein the target basket is configured to receive the radioisotope target therein via the target passage and be lowered through the vessel penetration into the reactor when irradiating the radioisotope target, and the bottom flange of the target basket forms a seal with the bottom surface of the center tube when the target basket is in the first position.

### Claim 7 (depends on 6)

The target irradiation system of claim 6, further comprising a cable drive assembly that is connected to the target basked by a cable.

### Claim 8 (depends on 6)

The target irradiation system of claim 6, wherein the target elevator assembly forms a portion of the pressure boundary of the reactor when in fluid communication with the reactor.

### Claim 9 (depends on 6)

The target irradiation system of claim 6, wherein the fission reactor is a heavy-water moderated fission reactor.

### Claim 10 (depends on 9)

The target irradiation system of claim 9, wherein the radioisotope target is comprised of natural molybdenum.

### Claim 11 (depends on 6)

The target irradiation system of claim 6, wherein the target elevator assembly is mounted to the vessel penetration so that a portion of the body portion of the target elevator assembly extends downwardly into the vessel penetration.

### Claim 12 (depends on 6)

The target irradiation system of claim 6, wherein the cylindrical side wall of the target basket includes a plurality of apertures so that a moderator fluid of the fission reactor enters the target basket when the target basket is disposed in the fission reactor.