Patent Number: 
Section: claims

1. An apparatus arranged to control a temperature of uranium material in a uranium material storage container, comprising:a thermal guide which wraps around an external surface of the uranium material storage container to cause a heat transfer medium inside the thermal guide to exchange heat energy with the uranium material storage container;a heat exchanger to heat or cool the heat transfer medium outside the thermal guide; andwherein the thermal guide comprises selectively releasable connections which attach the thermal guide to the uranium material storage container. 2. An apparatus according to claim 1, wherein the thermal guide forms a thermally conductive contact with the uranium material storage container to cause the exchange of heat energy by conduction. 3. An apparatus according to claim 1, wherein the thermal guide is configured to guide the heat transfer medium around an exterior of the uranium material storage container. 4. An apparatus according to claim 1, wherein the thermal guide surrounds the uranium material storage container. 5. An apparatus according to claim 1, wherein the thermal guide comprises a thermally conductive heat transfer surface for locating against the external surface of the uranium material storage container and through which heat energy is exchanged between the heat transfer medium in the guide and the uranium material storage container. 6. An apparatus according to claim 1, wherein the thermal guide comprises a heat insulating surface which is configured to prevent heat transfer between the heat transfer medium in the guide and the atmosphere around the uranium material storage container. 7. An apparatus according to claim 1, configured to controllably heat or cool the heat transfer medium in order to cause heating or cooling of the uranium material inside the uranium material storage container. 8. An apparatus according to claim 1, configured to detect the temperature of the uranium material storage container and to heat or cool the heat transfer medium in response to the detected value of the temperature of the uranium material storage container. 9. An apparatus according to claim 1, configured to heat or cool the heat transfer medium to obtain a predetermined target temperature for the uranium material storage container. 10. An apparatus according to claim 1, wherein the thermal guide comprises a plurality of sections which wrap around a corresponding plurality of regions of the uranium material storage container. 11. An apparatus according to claim 1 arranged to circulate the heat transfer medium between the thermal guide and the heat exchanger to heat or cool the heat transfer medium. 12. An apparatus according to claim 1, comprising a further thermal guide which wraps around an external surface of a further uranium material storage container to cause a heat transfer medium inside the further thermal guide to exchange heat energy with the further uranium material storage container, wherein the heat exchanger is configured to cause heat energy extracted from a warmer of the storage containers to be transferred to a cooler of the storage containers. 13. A uranium material storage container wrapped in a thermal guide of an apparatus according to claim 1. 14. A method of controlling a temperature of uranium material in a uranium material storage container, comprising:wrapping the uranium material storage container in a thermal guide of an apparatus arranged to control the temperature of uranium material in the uranium material storage container, wherein the thermal guide comprises selectively releasable connections which attach the thermal guide to the uranium material storage container; andusing a heat exchanger of the apparatus to heat or cool a heat transfer medium outside the thermal guide to cause the heat transfer medium to exchange heat energy with the uranium material storage container when inside the guide. 15. The apparatus according to claim 1, whereinthe thermal guide is flexible and configured to be wrapped around, and unwrapped from, a cylindrical surface of the uranium material storage container, and the thermal guide is connected to the heat exchanger by a circulation line. 16. The apparatus of claim 15, whereinthe uranium material storage container is one of a 48Y UF6 storage and transport cylinder or a 30B UF6 cylinder, andthe thermal guide is sized to extend around a full circumference of the uranium material storage container. 17. The method of claim 14, wherein the thermal guide is flexible, wherein the wrapping comprises wrapping the thermal guide around a cylindrical surface of the uranium material storage container, and further comprising:unwrapping the thermal guide from around a cylindrical surface of the uranium material storage container. 18. The method of claim 17, whereinthe uranium material storage container is one of a 48Y UF6 storage and transport cylinder or a 30B UF6 cylinder, andthe thermal guide is sized to extend around a full circumference of the uranium material storage container.