CONTROL METHOD OF TIGHTNESS OF FUEL ELEMENT JACKETS Russian patent published in 2015 - IPC G21C17/22 

FIELD: power industry.

SUBSTANCE: control method of tightness of fuel element jackets involves recording of delayed neutrons in coolant of the first circuit of a nuclear reactor by means of the first detector (1) at equal time intervals T corresponding to the time of full circulation cycle of the coolant in the first reactor circuit, measurement of intensities N_i and N_i+T of detector signals, which are proportional to neutron activity of the coolant at time moments t_i and t_i+T, determination of difference (N_i+T-N_i)_K=ΔN_K, where k - number of a subtraction procedure, comparison of difference ΔN_K to value ΔN_K-1. Signal of detector (1) is supplied through differential transformer (2) and amplifier (3) to discriminator (4) that provides discrimination of noises of amplifier (3), processes and converts analogue signals to standard pulses for transmission to the input of count-code converter (5). Further, signals are supplied to PC (6), where they are processed as per the specified algorithm. Fulfilment of condition ΔN≥2ΔN_K-1 means depressurisation of fuel element jackets.

EFFECT: improving accuracy and reliability of control of tightness of fuel element jackets.

1 dwg