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BORIC ACID RADIOLYSIS IN PRIMARY COOLANT WATER OF PWR AT TEMPERATURE  OF 250 o C. The existence of oxygen in the primary coolant system of PWR could lead to  corrosion, hence it is very important to suppress the oxygen concentration in the system.  Therefore, study of the effect of boric acid addition into the primary coolant water system of  PWR to suppress oxygen concentration resulted from gamma-ray radiation is essential to be  performed. The aim of this research is to understand reaction mechanism at temperature of  250 0 C and the effect of boric acid adding toward oxygen concentration in the PWR primary  coolant water. Methodology used is simulation using Facsimile software. Input for the software  namely radiolysis reaction mechanism for pure water, G value from radiolysis product, dose rate  of 1 and 10 4 Gy/s, aeration and deaeration system, and specific reaction of boric acid with  hydroxyl radical and hydrated electron at temperature 25 0 C and 300 0 C. The output are in the  form of irradiation time vs oxygen concentration time series. The results show that the oxygen  production increase significantly with the irradiation time and reach the saturated concentration  at 10 7 s. Based on the plot of oxygen’s concentration at 10 7 s vs boric acid, several results are as  following: oxygen concentration significantly suppressed by boric acid addition and gives the  exponential decreasement, the higher dose rate gives the higher concentration of oxygen, the  aeration system gives no effect on suppressing oxygen concentration at boric acid addition up to  0.1M.

Boric Acid Radiolysis in Primary Coolant Water of PWR at Temperature of 250oC