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

As a novel technique to enhance the effect of H 2 addition for HWC (hydrogen water chemistry) in BWR coolant, UV light photolysis of H 2 O 2 was proposed. The effect of the H 2 O 2 photolysis on water radiolysis was simulated for a batch system at 288°C. It was demonstrated that this technique reduced the concentrations of H 2 O 2 and O 2 with less amount of H 2 than that under ordinary HWC condition. It was found that the technique can reduce the H 2 O 2 concentration even in the absence of H 2 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 H 2 O 2 decomposition in coolant of a BWR plant was pointed out.