Transport processes in steam generator crevices. II. A simplified method for estimating impurity accumulation rates

被引:16
作者
Engelhardt, GR
Macdonald, DD
Millett, PJ
机构
[1] SRI Int, Menlo Park, CA 94025 USA
[2] Elect Power Res Inst, Palo Alto, CA 94304 USA
关键词
steam generator corrosion; boiling crevice model; coupled environment fracture model;
D O I
10.1016/S0010-938X(99)00040-2
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
An approximate, yet accurate method for calculating average volume concentrations of impurities and corrosion products in Pressurized Water Reactor (PWR) Steam Generator (SG) tube/tube support plate crevices has been developed. The method is based on the assumption that the real concentration profiles can be approximated by ideal step functions. The method yields analytical expressions for such important parameters as the rate of accumulation of impurities, corrosion current density, liquid velocity, saturation, transition time, and wetted length. It is shown that, under normal operating conditions of a PWR SG, we can estimate the corrosion rate even when only meager information is available for the physical parameters of the system. The method also permits prediction of the accumulation of impurities in crevices for long times, if the corresponding experimental measurements are available only for short times. Long-term predictions from the model describe the experimental data with great accuracy. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:2191 / 2211
页数:21
相关论文
共 11 条
  • [1] [Anonymous], 1989, ASME HDB WATER TECHN
  • [2] BALAKRISHNAN PV, 1980, P WAT CHEM NUCL REAC
  • [3] CLEARY JG, 1983, NP2979 EPRI
  • [4] ENGELHARDT G, 1998, UNPUB CORROS SCI
  • [5] GONZALEZ F, 1988, NUCL J CANADA, V1, P129
  • [6] Lumsden J. B., 1997, P 8 INT S ENV DEGR M
  • [7] MILLETT PJ, 1991, ENV DEGRADATION MAT
  • [8] MILLETT PJ, 1991, THESIS U CONNECTICUT
  • [9] MILLETT PJ, 1989, P ENV DEGR MAT NUCL
  • [10] PARK JR, 1998, CORROSION, V45, P563