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Precursor Based PTS Screening Methodology of the EOP Operator Actions for PWR Plant

[+] Author Affiliations
Tomislav Bajs, Ilijana Iveković

ENCONET d.o.o., Zagreb, Croatia

Ivica Bašič

APOSS d.o.o., Zabok, Croatia

Davor Grgič

University of Zagreb, Zagreb, Croatia

Paper No. PVP2011-58039, pp. 303-310; 8 pages
  • ASME 2011 Pressure Vessels and Piping Conference
  • Volume 5: High-Pressure Technology; Nondestructive Evaluation; Nuclear Engineering
  • Baltimore, Maryland, USA, July 17–21, 2011
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4455-7
  • Copyright © 2011 by ASME


The reactor pressure vessel integrity must be preserved throughout the plant operation as well as in the postulated accidental conditions. Operator actions undertaken to mitigate consequences of the accidents should not increase the probability of Pressurized Thermal Shock transients (PTS), transients with high pressure in reactor coolant system and interaction of cold safety injection water and hot vessel wall, which can damage reactor pressure vessel. In order to provide bounding analysis for the development of the Emergency Operating Procedures (EOP) background analysis, precursor based PTS screening methodology was used, according to determined criteria, to select the most severe PTS scenarios for two loop Pressurized Water Reactor (PWR) Nuclear Power Plant (NPP). In order to bound asymmetrical behavior of the two loop plant, selected transients were further analyzed with vertically split reactor vessel model and precursor based analysis was made for the results of the split reactor vessel analysis. The results of these analyses have been used as boundary conditions for the two-dimensional FEM reactor vessel integrity analysis.

Copyright © 2011 by ASME



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