Read Online or Download Coolant Tech. of Water-Cooled Reactors Vol 1 [Chemistry of Pri Coolant] (IAEA TECDOC-667v1) PDF
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Extra info for Coolant Tech. of Water-Cooled Reactors Vol 1 [Chemistry of Pri Coolant] (IAEA TECDOC-667v1)
The control parameters are - impurity level, particularly chloride and fluoride ions - nitrogen in the cover gas, that forms nitric acid under irradiation (expectedly not in dangerous amounts) - dissolved oxygen and deuterium, that can increase corrosion on stainless steel and hydriding on zirraloy, respectively 1 2 Steady state operation specifications The liaits of the chemical parameters during normal operation, based on the previously discussed concepts, are sunmarized in Table II, together with the desirable values for the best available conditioning.
The influence of oxygen in the water and the preformed oxide coatings, 10th. J. 12 1 (1977) 6. R. CORTI Departamento de Quimica de Reactores, Comisiön Nacional de Energfa Atomica, Buenos Aires, Argentina Abstract Speciation in aqueous solutions containing boric acid and lithium hydroxide has been studied using all the available information in the literature on the ionic equilibria in this system. The temperature dependence of the equilibrium constant was used to estimate the pH of the solutions at temperatures relevant to the PWR chemistry.
Considerations The main objective of chenical control is to optimze water quality thus minimizing general metal release rate and the probability of selective corrosion occurrence, to avoid deposition of corrosion products on heat transfer surfaces, to limit cheaistry related dose rate build-up and to suppress oxygen formation by radiolysis. 3H activity (d/l) Redox conditioning is achieved through deuterium injection. Concentrations within 2 and 4 »g/kg heavy water are recommended. 5 mg/kg are insuficient to counteract radiolytic generation of molecular oxygen and values below 2 mg/kg has a negative influence in magnetite solubility since it depends on cubic root of hydrogen pressure.