Method and device for encapsulating a fuel rod or a fuel rod section for temporary storage
A method for encapsulating a fuel rod or a fuel rod section in a container includes inserting the fuel rod or fuel rod section into the container. One of the ends of the container is connected to a purging-gas line. The container is dehydrated and purged by use of a purging gas. The ends of the container are connected to a bypass line in such a way that a closed gas circuit is produced and a hot gas is circulated in the gas circuit until the absolute moisture content reaches an end value at which the absolute moisture content no longer rises. The container is disconnected from the gas circuit and subsequently the container is closed in a fluid-tight manner at both ends.
1. A device for encapsulating a fuel rod or a fuel rod section in a container, the device comprising:
chambers including a first chamber and a second chamber, said first and second chambers disposed spaced apart from one another and on a common system axis, said first chamber having a first opening formed therein, said second chamber having a second opening formed therein, said first opening configured to receive a first end of the container and said second opening configured to receive a second end of the container, wherein the first end of the container projects into said first chamber and the second end of the container projects into said second chamber such that said first and second chambers, are fluidically connected to one another exclusively via the container;
an inlet line connected to said first chamber;
an outlet line connected to said second chamber, said inlet and outlet lines for transporting a scavenging gas;
a bypass line connecting said inlet line to said outlet line, said bypass line running outside of said chambers such that a closed gas circuit is formed;
a pump and a heating device disposed in said closed gas circuit for assisting in circulating and heating a heating gas situated in said closed gas circuit;
measurement devices disposed in said closed gas circuit and configured for detecting an absolute moisture content of the heating gas flowing from said second chamber into said bypass line; and
each of said chambers having means for closing the container.
2. The device according to claim 1 , further comprising a connecting pipe concentrically surrounding the container with the first and second ends of the container proiecting beyond ends of said connecting pipe, said connecting pipe configured to rigidly connect said first and second chambers along the common system axis.
3. The device according to claim 2 , further comprising at least one sealing element disposed between the container and said connecting pipe, said at least one sealing element configured to prevent fluid communication between said two chambers via said connecting pipe.
4. The device according to claim 3 , wherein said at least one sealing element is two adjustable sealing elements, said sealing elements disposed on both ends of said connecting pipe between the container and said connecting pipe and configured to fluidly isolate a cylindrical gap between the container and said connecting pipe from said chambers.