Fission Product Release From Uranium Heated in Air

Regulatory Technology Development Plan - Sodium Fast Reactor. Mechanistic Source Term - Metal Fuel Radionuclide Release

“…Other melt testing, conducted at Hanford in the late 1950s, also demonstrates the effects of oxidization on fission product release and provides another dataset for fission product volatilization [14]. This test melted uranium metal (irradiated to 2.4 × 10 14 n/cm 2 ) samples at 1215°C for 25 minutes in both air and helium in a zirconia (ZrO 2 ) boat.…”

“…Conversely, melt experiments at Hanford (described in Section 2.1.2.2) found over 40% of the iodine volatized from a pure metallic uranium sample when heated to 1215°C for 25 minutes. There is very little supporting data regarding this test in ref [14], as the main focus of the melt tests were on oxidation of uranium metal in air. It is unclear why the result of this test is substantially different from other experience (for various radionuclides).…”

Analysis of Credible Accidents for Argonaut Reactors

“…This is a conservative assumption given the low fuel temperature and the fact that not all the fission gases would move out of the fuel. Because of the low temperature, any release of other fission products, including the semivolatiles, such as strontium, would be negligible (Cordes 1968;Hilliard 1959;Thompson 1964). …”

Vapor Containment in the Oak Ridge Research Reactor

“…,.,., .... TfUo;OZ rem . (10) o Values of Ai' Wi' and ,A i for the various iodine isotopes are given in 10gives the upper limit of the dose received at a point…”

“…In the maximum value that 100 can take at each down-wind point. Thus it in necessary to maximize equation (10) with respect to the wind speed for each stability condition at each point where its value is sought. The maximum of these maxima then represents the upper limit of the dose to be expected at that pOint.…”