Abstract
In special experiments performed in a PWR-NPP low-frequency neutron noise effects were found to be induced by local coolant boiling. A model for describing this phenomenon is developed. It is based on the assumption that integral void fluctuations are the neutron physical perturbation source. The void fluctuations themselves depend on primary noise sources (fluctuations of inlet temperature, coolant flow rate, reactor power) which are estimated with a thermohydraulic model from the axial dependence of temperature noise signals. The theoretical results are compared with measured values. It is shown that the low-frequency neutron noise can be used for boiling monitoring in PWRs.
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