Abstract An algorithm for assessing, theoretically, the effectiveness of hydrogen water chemistry (HWC) in Boiling Water Reactors (BWRs) is described. The algorithm, DAMAGE-PREDICTOR, contains facilities for estimating the concentrations of radiolysis products (in particular O2, H2, and H2O2), the electrochemical corrosion potential (ECP), and the kinetics of growth of a reference crack in sensitized Type 304SS, around the primary heat transport circuit (HTC) as a function of power level and the concentration of hydrogen added to the feedwater. The power level, in turn, determines various thermal- hydraulic input parameters and the neutron and gamma energy deposition rate in the core and near-core regions. These input parameters are estimated using well-established algorithms, and the simulations have been carried out for full power conditions for two reactors that differ markedly in their responses to HWC. DAMAGE-PREDICTOR, when calibrated against recirculation oxygen levels in one plant, is found to successfully account for various plant data from both reactors (including steam line oxygen and hydrogen levels, ECP values from remote autoclaves attached to the recirculation system, and in-core ECP data) using a single set of model parameter values.
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