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Power Uprate Evaluation of Main Steam Isolation and Main Steam Check Valve Using Advanced Engineering Models

[+] Author Affiliations
M. S. Kalsi, Neal Estep, Zachary Leutwyler

Kalsi Engineering, Inc., Sugar Land, TX

Paper No. ICONE18-30295, pp. 479-483; 5 pages
  • 18th International Conference on Nuclear Engineering
  • 18th International Conference on Nuclear Engineering: Volume 6
  • Xi’an, China, May 17–21, 2010
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 978-0-7918-4934-7
  • Copyright © 2010 by ASME


Analyses were performed by Kalsi Engineering, Inc. (KEI) on the main steam isolation valves (MSIV) and main steam check valves (MSCV) at 4 pressurized water reactors to evaluate their capability to perform design basis functions at Extended Power Uprate (EPU) conditions. Disc closing velocities and actuator pressures (for MSIV) were calculated by using RELAP™ . These inputs included valve specific flow and torque coefficients obtained by detailed Computational Fluid Dynamics (CFD) analyses to accurately predict hydrodynamic torque imposed on the disc throughout the stroke. Stresses, strains and displacements in all of the critical MSCV and MSIV components were determined by performing appropriate 2-D and 3-D elasto-plastic, transient dynamic finite element analysis (FEA). Fatigue life of the components under spurious closure was determined in accordance with applicable ASME Section III Code. The evaluation also included the propensity for excessive wear of the MSCV due to disc flutter, vibration and erosion.

Copyright © 2010 by ASME



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