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Evaluation of Wall Thinning of PWR Feed Water Piping With the Coupled Model of Static Electrochemical Analysis and Dynamic Double Oxide Layer Analysis

[+] Author Affiliations
Masanori Naitoh, Shunsuke Uchida, Hidetoshi Okada

The Institute of Applied Energy, Tokyo, Japan

Taku Ohira

Japan Atomic Power Co., Chiyoda, Japan

Seiichi Koshizuka

The University of Tokyo, Tokyo, Japan

Paper No. PVP2010-25517, pp. 1243-1252; 10 pages
doi:10.1115/PVP2010-25517
From:
  • ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference
  • ASME 2010 Pressure Vessels and Piping Conference: Volume 6, Parts A and B
  • Bellevue, Washington, USA, July 18–22, 2010
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-49255 | eISBN: 978-0-7918-3878-5
  • Copyright © 2010 by ASME

abstract

In order to confirm applicability and accuracy of FAC evaluation methods based on the coupled FAC model of static electrochemical analysis and dynamic oxide layer growth analysis, wall thinning rates calculated with the proposed methods were compared with those measured for the secondary piping of a PWR plant. Flow turbulence at major parts of the system was calculated with 3D CFD codes and extrapolated to the very surface of piping wall to obtain mass transfer coefficients at boundary layers of the structure surfaces. Then, wall thinning rates were calculated with the coupled FAC model by applying the mass transfer coefficients. Major conclusions are as follows: 1) Flow distribution calculated with 3D CFD codes could be extrapolated by applying 2/7 power law of turbulence energy as a function of distance from the surface to those at the very surface of the piping to obtain a precise distribution of mass transfer coefficients. 2) Wall thinning rates calculated for large scale piping of a PWR by applying the obtained mass transfer coefficients agreed with the measured rates within a factor of 2. 3) As a result of demonstration of the FAC evaluation model, it was confirmed that suitable amount of oxygen injection into the feed water resulted sufficient mitigation of FAC without any serious adverse effect on steam generator tubing.

Copyright © 2010 by ASME

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