Study of PWR transients by coupling of ANSYS-CFX with a kinetic model

Document Type: Original Article

Authors

Nuclear Engineering Department‎, ‎Shahid Beheshti University‎, ‎G.C‎, ‎P.O‎. ‎Box 1983963113‎, ‎Tehran‎, ‎Iran

Abstract

‎In this work‎, ‎dynamic responses of a WWER-1000 reactor in reactivity insertions are studied using a coupling method‎. ‎The ANSYS-CFX is implemented for thermal hydraulic study of the core and the point kinetic equation (PKE) is coupled as a FORTRAN subroutine‎. ‎For transient analysis of the core‎, ‎the thermal feedback of the fuel is added to coolant‎, ‎and numerical solver of cylindrical heat transfer for obtaining the irradiated fuel rod temperature profile is also included‎. ‎In order to investigate the irradiation effect‎, ‎the fuel and gap properties in burnup with appropriate correlations could be calculated‎. ‎Using memory management system (MMS) and data transfer arrays, coupling between numerical subroutines is carried out‎. ‎It is shown that the dynamic response of the core depends on burnup‎, ‎and the response could be varied in time‎. ‎In addition‎, ‎the coupling method is reliable for other dynamic calculations‎.

Highlights

  • The reactivity response of an irradiated PWR core with coupling CFX and PKM is studied.
  • Eff ects of ssion gas release, dissolved gases, porosity, radiation damage and fuel Burnup are considered.
  • Using the MMS, the online data transferring from CFX and subroutines is available.
  • The response of the BNPP reactor in several reactivity insertions during burnups is studied.
  • The e ects of irradiation on dynamic response of fuel in a FA and core are shown.

Keywords