Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

2 Publications

Development and application of a fast running model for the description of coolant mixing inside the pressure vessel of pressurized water reactors

Kliem, S.; Prasser, H.-M.; Höhne, T.; Rohde, U.

An efficient semi-analytical model for the description of the coolant mixing during stationary and transient processes inside the reactor pressure vessel (RPV) of pressurised water reactors (PWR) has been developed. This model is based on the technique of linear superposition of response functions on Dirac impulse shaped perturbation functions. In the model, the RPV is represented formally by a group of transfer systems (for each combination of inlet nozzle position and fuel element position one) with one input and one output each. An experimental way of obtaining the transfer properties is shown on the example of the German PWR KONVOI. The validation of the model against experimental data from the 1:5 scaled coolant mixing test facility ROCOM is presented.
The semi-analytical model for the description of coolant mixing has been used in combination with the 3D reactor dynamics code DYN3D for the analysis of a hypothetical boron dilution event after start-up of the first main coolant pump in a generic four-loop PWR. The model provides realistic time-dependent boron concentration fields at the core inlet. By varying the initial slug volume it was found, that for the given core configuration slugs of less than 20 m3 do not lead to a re-criticality of the shut-off reactor. Calculations with the bounding slug volume of 36 m3 show, that the corresponding reactivity insertion does not lead the safety relevant consequences.

  • Lecture (Conference)
    Int. Conf. on the Physics of Reactors PHYSOR 2002,Seoul, Korea, 6.-10.10.2002, Proc. CD-ROM paper 5D-04
  • Contribution to external collection
    Int. Conf. on the Physics of Reactors PHYSOR 2002,Seoul, Korea, 6.-10.10.2002, Proc. CD-ROM paper 5D-04

Permalink: https://www.hzdr.de/publications/Publ-4472
Publ.-Id: 4472