Results of Neutron Fluctuation Measurements Made During the MSRE Zero-Power Experiment
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Neutron fluctuation measurements were made during the MSRE zero-power experiment as part of the dynamic tests requested by the project. A first attempt to measure subcritical reactivity was unsuccessful, because the detection efficiency of a 1-atm BF3 ionization chamber installed in the nuclear instrument penetration was too low. A 2-atm BF3 chamber was installed in the thermal shield, and with the reactor operating at 10 w, it was determined that the effective delayed-neutron fraction Be increased 1.58 ± 0.21 when fuel circulation was stopped. From measurements made with a low pump-bowl level, it is believed that neutron fluctuations are strongly affected by entrained gas in the fuel salt.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1524575
- Report Number(s):
- CF-65-10-18
- Country of Publication:
- United States
- Language:
- English
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