METHOD FOR CONTROLLING DECONTAMINATION OF PRESSURE-TUBE POWER REACTOR COOLANT CIRCUIT Russian patent published in 2007 - IPC G21F9/00 

FIELD: nuclear power engineering.

SUBSTANCE: proposed method designed for controlling cyclic decontamination process by determining optimal time of completing separate decontamination steps involving uninterrupted cleaning of decontaminating solutions in filters and primarily intended for removing radioactive pollutants from surfaces of equipment or separate parts by circulating solution, for instance for decontaminating inner surfaces of nuclear power reactor equipment such as coolant circuits of boiling water reactors (heavy-power pressure-tube reactors RBMK) includes chemical loosening operations and dynamic loosening conducted before and after chemical loosening operation, as well as washing to discharge radioactive pollutants from coolant circuit to filters during each loosening operation. Radioactivity level of pollutants discharged from coolant circuit is periodically checked against reference radionuclides, and each decontaminating operation is completed upon attaining following condition: . In addition, radioactivity level of pollutants discharged from coolant circuit is proposed to be calculated by sum of derived radioactivity of 3-7 reference radionuclides; ^58,60Co, ⁵⁴Mn, ⁵⁹Fe ⁹⁵Zr, and ⁹⁵Nb are used as reference radionuclides.

EFFECT: enhanced reliability of process control due to determining optimal time of completing separate steps, reduced decontamination time, enhanced effectiveness due to reduced secondary sorption of radionuclides.

3 cl, 13 dwg, 3 tbl