Figure 1 Change in pH, Gas Concentration, and Nitrogen Compounds With Excess Oxygen Added

EFFECTS OF RADIATION DOE-HDBK-1015/2-93 Reactor Water Chemistry ON WATER CHEMISTRY (SYNTHESIS) CH-03 Rev. 0 Page 8 Figure 1 Change in pH, Gas Concentration, and Nitrogen Compounds With Excess Oxygen Added Normally, the amount of hydrogen maintained in the reactor coolant, in conjunction with other precautions employed, greatly reduces the probability that the amount of oxygen entering the coolant will be sufficient to lead to Reaction (3-16). If a large amount of air were accidentally added to the reactor coolant, one solution would be to add more hydrogen. The added hydrogen would react with remaining oxygen, disrupting the equilibrium of Reaction (3-16) causing the reverse step of that reaction to occur. When all the oxygen has been removed, H and N could 2 2 react by Reaction (3-14) and help reestablish a basic pH. The relationship between these reactions and pH following the initial oxygen addition, and a subsequent hydrogen addition, is illustrated in Figure 1.