Non-invasive liquid level and density gauge for nuclear power reactor pressure vessels

摘要

A method and means of non-invasively determining the liquid level and density in a nuclear power reactor pressure vessel is disclosed. In general the method consists of detecting neutron levels external of the pressure vessel at least at positions adjacent the bottom of the fuel core, the center of the fuel core and the top of the fuel core; and the detected neutron level signals are directed to monitoring means.P PThe detecting means may comprise fission chambers and monitoring means may comprise simple electric meters.