| 摘要 |
873,552. Nuclear fuel elements. PARSONS & CO. Ltd., C.A. Oct. 13, 1958 [Oct. 21. 1957; Jan. 13, 1958], Nos. 32754/57 and 1234/58. Class 39(4). A fuel element for use at temperatures of the order of 500‹C. comprises a number of tubes a containing fuel, e.g. uranium oxide, the tubes being helically disposed to define a cylindrical coolant channel a<SP>1</SP> which is divided into a number of separate flow paths b<SP>1</SP> by an axially extending support member b, the radially extending walls b<SP>1</SP> of the member b having slots formed in their edges to receive the tubes a. The tubes are connected at their ends by rings c and a graphite sleeve d may be supported between the rings but spaced from the tubes. As shown in Fig. 1, each helix comprises a number of tubes a radially arranged and to decrease the coolant pressure drop the lead of the helix may be increased at the inlet end and decreased at the outlet end. The tubes a may be formed from beryllium or stainless steel. The fuel element is intended for use in a gas cooled graphite moderated reactor. In another construction (Fig. 2, not shown) the tubes a are straight but coolant flow paths similar to Fig. 1 are formed by imparting a helical shape to the radially extending walls b<SP>1</SP> of the member b. Specification 847,214 is referred to. |
