Patent Number: 
Section: claims

1. A fuel assembly comprising:a channel nosepiece;a lower tie plate positioned above the channel nosepiece; andat least one bundle retention clip connected to the channel nosepiece and the lower tie plate and configured to resist movement of the lower tie plate away from the channel nosepiece,wherein the lower tie plate includes at least one slot, and the at least one bundle retention clip includes an engagement region configured to be inserted into the slot,wherein the at least one slot and the engagement region are configured such that once the engagement region is inserted into the slot, the retention clip responds to vertical separation of the lower tie plate and the bundle retention clip by causing a force to be exerted on the lower tie plate in a direction towards the channel nosepiece,wherein the engagement region includes at least one spring member, the at least one spring member including a first protrusion extending outward from a central axis of the retention clip, the first protrusion including a first edge angled with respect to the central axis at a first angle, the slot being configured to engage the first edge such that,after the engagement region is inserted into the slot, the slot causes the first spring member to contract towards the central axis during the vertical separation of the lower tie plate and the bundle retention clip, andan amount of the contraction of the first spring member towards the central axis increases as the vertical separation increases, thereby increasing the force exerted on the lower tie plate as the vertical separation increases, the central axis being defined as an axis extending down a center of the retention clip along a length of the retention clip. 2. The fuel assembly of claim 1, wherein the at least one bundle retention clip further includes a base region connected to the engagement region, at least a portion of the base region being wider than a remainder of the retention clip in a direction perpendicular to the central axis. 3. The fuel assembly of claim 1, wherein the first angle is between 45° and 52°. 4. The fuel assembly of claim 1, wherein the at least one spring member includes a second protrusion extending outward from the central axis and spaced apart from the first protrusion. 5. The fuel assembly of claim 4, wherein the at least one spring member is arranged as a cantilever spring capable of rotating inwards towards the central axis and configured to respond to the inward rotation by exerting an outward, lateral force. 6. The fuel assembly of claim 1, wherein the at least one spring member includes first and second spring members at opposite sides of the central axis. 7. The fuel assembly of claim 1, wherein the engagement region further includes a middle member in between the first and second spring members such that a first gap exists between the middle member and the first spring member, and a second gap exists between the middle member and the second spring member.