Numerical simulation of influence of hydrogen peroxide photolysis on waterchemistry in BWR plant

As a novel technique to enhance the effect of HI 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 degreesC. It was demonstrated that this technique reduc ed the concentrations of H2O2 and O-2 with less amount of H-2 than that und er ordinary HWC condition. It was found that the technique can reduce the H 2O2 concentration even in the absence of H2 addition although the OH concen tration increases concomitantly. The radiation chemical mechanism under ord inary HWC condition is discussed briefly. The UV laser power required to re duce concentrations of the oxidizing species was estimated for a dose rate of gamma -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.