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.

Subject
Circuits, Crack growth, Decomposition, Boiling water reactors, Hydrogen concentration, Recirculation, Reactors, Hydrogen peroxide, Constants, Heat, Oxygen, Damage, Hydrogen
Keywords:
Boiling Water Reactor, hydrogen water chemistry, water radiolysis, stress corrosion cracking, ECP, crack growth rate
© 1995 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1995
Association for Materials Protection and Performance (AMPP)
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