Patent ID: 6181761
Filing Date: 2001-01-30
Classification: G21C,Y02E

Abstract:
An apparatus for monitoring reactor power of a reactor at least at the time of startup thereof, comprising:a radiation sensor for detecting radiation doses associated with the reactor power as electrical signals having pulse components according to the radiation doses;analog filter means for filtering electrical signals having frequency components in a certain frequency band from the electrical signals detected by the radiation sensor;digital conversion means for converting the electrical signals having the frequency components filtered by the analog filter means to first digital data with an accuracy of certain bits on sampling intervals shorter than a pulse width of the pulse components;pulse measurement means for counting the number of pulses of the pulse components in a predetermined frequency band based on the first digital data converted by the digital conversion means;sum operating means for adding a plurality of sampling values forming the first digital data based on preset sum operation conditions so as to obtain second digital data having accuracy having more bits than those of the plurality of sampling values forming the first digital data converted by the digital conversion means;Campbell measurement means for calculating mean square values corresponding to power of fluctuation components caused by overlap of the pulse components in a predetermined frequency band based on the second digital data obtained by the sum operating means; andreactor power monitoring means for continuously monitoring the reactor power based on the number of pulses counted by the pulse measurement means and the mean square values calculated by the Campbell measurement means.