Reactor Water Chemistry DOE-HDBK-1015/2-93 CHEMISTRY PARAMETERS Rev. 0 CH-03 Page 13 TABLE 1 Summary of Reactor Coolant Chemistry Control Parameter Reason Method of Control pH   To preclude caustic stress     addition   To inhibit corrosion   Ion exchange   To protect corrosion film   Ammonium hydroxide     corrosion   Nitric acid addition Dissolved Oxygen   Hydrogen addition   To inhibit corrosion   Hydrazine addition Hydrogen   To scavenge oxygen   Hydrogen addition   To  suppress radiolytic     decomposition of water   To scavenge nitrogen   To preclude hydrogen   Degassification     embrittlement Total Gas Content   To protect pumps   Degassification   To indicate air in leakage   Deaeration of makeup water Conductivity   To minimize scale formation   Ion exchange   To indicate increased corrosion   Feed and Bleed Chlorides   To preclude chloride stress     corrosion   Ion exchange   Feed and bleed Fluorine   To preclude corrosion of Zr     cladding   Ion exchange   Feed and Bleed Boron   To control reactivity   Boric acid addition Radioactivity   To indicate increased corrosion   Ion exchange   To indicate a crud burst   Feed and bleed   To indicate a core fuel defect   To monitor effectiveness of     demineralizer