1. Missouri University Research Reactor, University of Missouri‐Columbia, Columbia, Missouri 65211
2. Chemical Engineering Department, University of Missouri‐Columbia, Columbia, Missouri 65211
3. Rockwell International, Rocketdyne Division, Canoga Park, California 91303
4. Central Research Institute of Electric Power Industry, Komae Research Laboratory, Tokyo, Japan
5. Kawasaki Heavy Industries, Limited, Nuclear Systems Division, Tokyo, Japan