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Numerical Simulation of Influence of Hydrogen Peroxide Photolysis on Water Chemistry in BWR Plant

As a novel technique to enhance the effect of H2 addition for HWC (hydrogen water chemistry) in BWR coolant, UV light photolysis of H2O2 was proposed. The effect of the H2O2 photolysis on water radiolysis was simulated for a batch system at 288°C. It was demonstrated that this technique reduced the concentrations of H2O2 and O2 with less amount of H2 than that under ordinary HWC condition. It was found that the technique can reduce the H2O2 concentration even in the absence of H2 addition although the OH concentration increases concomitantly. The radiation chemical mechanism under ordinary HWC condition is discussed briefly. The UV laser power required to reduce concentrations of the oxidizing species was estimated for a dose rate of †-ray 100Gy-s-1 based on the simulated results. A potential role of the Cherenkov radiation in H2O2 decomposition in coolant of a BWR plant was pointed out.