Abstract
General Atomic's TRIGA research reactor is essentially an array of cylindrical fuel rods of conventional geometry at the bottom of a large pool of water, cooled by natural convection and operated at power levels up to 2.0 MW. There can be some local boiling at higher reactor powers. Of many TRIGA reactors of similar design now in operation, only one makes an objectionable noise. Frequency spectral analysis of microphone data suggests that the source of the noise is volume oscillation of gas bubbles near the core, resonating with a standing acoustic wave in the pool. The bubble-oscillation natural frequency varies inversely with aggregate-bubble volume. Resonance has been almost eliminated by improving the coolant flow and reducing the aggregate-bubble volume. Investigations into the problem and its solution are continuing.
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