The rate of fission product inventory release to the environment as a result of exposure of uranium fuel to high temperatures should be known to more realistically assess the consequences of a credible accident. To obtain an acceptable experimental evaluation of releases it is necessary to have similar conditions to those which would exist in the reactor. Fission product release rate experiments exploring temperatures below the uranium melting point were performed for Douglas United Nuclear by D. L. Reid of Battelle-Northwest. Data and some conclusions from the initial tests are presented in this report. The intent of distributing this information is to make known results and to record data transmitted in correspondence from Battelle-Northwest to DUN.