G-Frc: Calculation of the Jet Flow parameters and Fluid Flow Reaction Forces and resulting from the High Energy Pipe breaks




G-Frc is software for evaluation of the reaction forces exciting the high energy piping due to a release of the medium from a circumferential or longitudinal break. The program also allows assessing an impact of jet flow on the surrounding structures which are inside the zone of the jet expansion. Jet impact includes excessive pressure, temperature and wetness.


The results obtained by means of G-Frc could be used for the consequent piping dynamic analysis and also for the jet impact evaluation on the surrounding structures and estimation of their protection feasibility.  


The code is based on the analytical model presented in American National Standard ANSI/ANS-58.2-1988 "Design Basis for Protection of Light Water Nuclear Power Plants Against the Effects of Postulated Pipe Rupture".


    According to ANSI/ANS-58.2-1988 G-Frc code considers for the following types of breaks:
  • Circumferential break with full separation (guillotine rupture);
  • Circumferential break with limited separation;
  • Longitudinal break;
  • Through-Wall Crack.


    For the case of circumferential break with limited separation two possible options exist:
  • pipe ends limited separation at the rupture is provided by the manner of the pipe fixing at the vicinity of the rupture;
  • pipe ends limited separation at the rupture is provided by the special flow limiter installation on the place of the pipe potential rupture intended for the medium flow rate reducing out of the rupture.


    The code can operate with the following mediums:
  • Saturated water steam;
  • Superheated water steam;
  • Pressurized water with the temperature less than saturation temperature but higher than 100oC;
  • Pressurized water with the temperature less than 100oC.


Two last-mentioned types differ by their ability to flash just at the rupture area.


    Jet impact on the target (civil structures, equipment, etc.) is evaluated under the following assumptions:
  • the target is located normally to the jet axis;
  • the target surface is significantly larger than the jet cross-section at the area of the jet impinging on the target, that is the jet impinging spot is totally disposed inside the target surface.


G-FRC can be used independently or being incorporated in dPIPE software.

Use of the program requires the protection key.

Demo version is limited only by one piping cross-section 620x25:




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