Patent Number: 
Section: claims

1. A fuel assembly comprising:fuel rods;two or three water rods;a tie plate arranged for supporting said two or three water rods, wherein said two or three water rods are secured to the tie plate;one or more spacers configured to support said fuel rods and said two or three water rods;a handle secured to the water rods at a respective top end of each of the water rods, anda joint arrangement,wherein the handle is secured to said two or three water rods by means of the joint arrangement, said joint arrangement being configured to transfer a vertical lifting force from the handle to said two or three water rods;said joint arrangement comprises:a balancing element arranged between said two or three water rods and the handle; wherein said joint arrangement further comprises:a first joint arranged between the balancing element and the handle;a set of second joints, where each second joint of the set of second joints is arranged between a respective one of said two or three water rods and said balancing element; whereinsaid first joint and said set of second joints are configured to allow a rotational movement of said balancing element in relation to said handle as well as in relation to said two or three water rods, and whereinsaid first joint and each one of said second joints comprise a pair of spherically rounded joint surfaces. 2. A fuel assembly according to claim 1, wherein said first joint is centrally arranged in relation to the second joints. 3. A fuel assembly according to claim 1, wherein said pair of spherically rounded joint surfaces of said first joint comprises one spherically rounded joint surface on the handle and one spherically rounded joint surface on the balancing element, and wherein the spherically rounded joint surfaces of said pair of spherically rounded joint surfaces of the first joint are arranged in contact with each other. 4. A fuel assembly according to claim 1, said first joint comprising distance means configured to provide a clearance for rotation of the balancing element in relation to the handle. 5. A fuel assembly according to claim 1, wherein a respective fastener is secured to the top portion of each water rod and wherein each of said pairs of spherically rounded joint surfaces of said second joints comprises one spherically rounded joint surface on the fastener and one spherically rounded surface on the balancing element, so that the balancing element comprises one spherically rounded joint surface for each fastener, and wherein the spherically rounded joint surfaces of each of said pairs of spherically rounded joint surfaces of the set of second joints are arranged in contact with each other. 6. A fuel assembly according to claim 5, wherein each respective fastener comprises a nut, wherein a bottom side of each nut comprises a respective one of the spherically rounded joint surfaces of the set of second joints. 7. A fuel assembly according to claim 1, wherein said balancing element comprises two or three through-going holes, wherein each one of said two or three water rods extends through one of the through-going holes so that one water rod extends through each through-going hole, and wherein each of said through-going holes is configured with an internal diameter that provides a clearance for the respective water rod thereby allowing rotational movement of the balancing element in relation to each water rod. 8. A fuel assembly according to claim 1, wherein the number of said two or three water rods are three. 9. A fuel assembly according to claim 1, wherein the number of said two or three water rods are two. 10. A fuel assembly according to claim 1, wherein the balancing element consists of a single element, said single element being provided with said spherically rounded surface of the first joint on its bottom side, and being provided with said spherically rounded surfaces of the second joint on its top side. 11. A fuel assembly according to claim 10, wherein said single element is a plate-like element. 12. A fuel assembly according to claim 1, wherein said balancing element is arranged to rotate upon experiencing mutually different vertical forces from the water rods during lifting. 13. A fuel assembly according to claim 1, configured to be arranged inside a channel and wherein the tie plate, the spacer, the fuel rods and the water rods are configured for being lifted out of the channel. 14. A fuel assembly according to claim 1, further comprising a channel, wherein the handle is attached to the channel and wherein the tie plate, the spacer, the fuel rods and the water rods are configured for being lifted together with the channel.