Since a continuous removai of solids from the screen area of the core during reactor operation is desired, a solution purge tube was designed fur the HRT. Fluid flow studies show the flow rate through this tube is 1.3 gpm which is equivalent to 2.2 fps. For solid particles of a density of 5 g/cc, this flow will permit the removal of spheroids up to 0.007 in. diameter according to Stokes' Law. Heat transfer studies show that the purge tube when in operation will be sufficiently cooled during the operation of the reactor at full power (5 Mw), but it may be damaged upon stoppage of flow through it unless the reactor is lowered to heat loss power. The reactor may be operated at full power under the latter conditions, however, if a 0.200 in. diameter bleed hole is drilled in the purge tube wall near the top of the outlet pipe of the core. All the calculations assume that there is no deposition of uranium on the purge tube wall. Such deposition could cause hot spots which may result in damage to the purge tube. (auth)