Dissolved Gases, Suspended Solids And pH Control Summary

Resin Overheating - h1015v2_81

Dissolved Gases, Suspended Solids And pH Control Summary (Cont.)

Chemistry Volume 2 of 2
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R SO₃Na H₂O R H H Na SO₄ heat DOE-HDBK-1015/2-93 DISSOLVED GASES, SUSPENDED SOLIDS, AND pH CONTROL Principles of Water Treatment CH-04 Rev. 0 Page 26 The CH Cl (chloromethane) will be released to the coolant and will decompose in the 3 radiation field of the reactor core, producing Cl ions. Similarly, the sodium form of the - cation resin will release Na ions by the following reactions. + A number of changes are probable if overheating of resin occurs. Reactor coolant Cl^- levels would probably increase as a result of thermal breakdown and subsequent release. Ion exchanger effectiveness would be greatly reduced for similar reasons. Radioactivity levels of the reactor coolant would increase because of the release of impurities collected and later released from the resin. pH would likely decrease because of the release of H⁺ ions from the cation resin complex and may cause acidic conditions of the reactor coolant if the temperature were sufficient (>250 F). Because the anion resin decomposes at lower temperatures, pH may increase as a result of the release of TMA and be accompanied by a dead fish odor. Because of the consequences of overheated resin, stringent temperature limitations are necessary. If overheating occurs, the ion exchanger should be taken out of service immediately and the cause rectified. The resin must be replaced prior to placing the ion exchanger back in service after overheating. Summary The important information in this chapter is summarized below. Dissolved Gases, Suspended Solids And pH Control Summary Because of the presence of impurities, raw water sources undergo treatment prior to use as makeup water in reactor facility systems. These systems normally utilize several distinct processes that remove solids, ionic impurities, and gases. Pretreatment of makeup water is necessary to reduce corrosion, minimize radiation, and limit fouling of heat transfer surfaces. If the hydrogen and hydroxyl forms of resin are used, the result is pure, neutral water. Other forms may be used to remove unwanted impurities from solution and substitute another substance, such as a base, to help control pH. Resins also filter solids suspended in a solution, but the efficiency for this is usually less than the efficiency for removal by ion exchange.

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