Abstract:
Prompt temperature feedback coefficient measurement of TRR-1M/1 (TRIGA MARK III) at the Office of Atomic Energy for Peace was carried out by direct measurements of heat trPrompt temperature feedback coefficient measurement of TRR-1M/1 (TRIGA MARK III) at the Office of Atomic Energy for Peace was carried out by direct measurements of heat transfer and reactor power characteristics during small power excursion experiment (reac¬tivities less than 60¢). An instrumented fuel element at position B1 was used to measure the temperature characteristic of fuel elements. From measured reactivities and heat transfer, prompt temperature feedback coefficient was calculated by using prompt-jump and one-delayed-neutron-group approximated diffusion equation, Newton's Law of Cooling, and linear reactivity equation. The core loading was mainly standard fuel elements. Averaged value of prompt temperature feedback coefficient obtained was-1.39 ¢/°c over the temperature range from 53°c to 57 °c. The result" is comparable to that obtained, by similar experiment, at the University of Arizona and about 16 percent above that reported by General Atomic Company, supplier of the reactor.ansfer and reactor power characteristics during small power excursion experiment (reac