Start‐Up of Cold Loop, the 7th AER Benchmark Calculation with HEXTRAN‐ SMABRE‐PORFLO
26th Symposium of AER on VVER Reactor Physics and Reactor Safety (2016, Helsinki, Finland)
Reactor dynamics and safety analysis
Abstract
THE SEVENTH AER BENCHMARK CALCULATION WITH HEXTRAN-SMABRE-PORFLOAnitta Hämäläinen, Ville Hovi, Elina Syrjälahti, Hanna Räty, VTT Technical Research Centre of FinlandABSTRACTThe seventh AER benchmark is the first AER Working group D benchmark, where three dimensional thermal hydraulic codes are supposed to be applied. The aim is to get a more precise core inlet temperature profile than the sector temperatures available typically with system codes. First the 7th BM is calculated with the internally coupled HEXTRAN-SMABRE reactor dynamics code. In the next stage one-way coupled analyses with the Porous CFD code PORFLO is performed. The results of these analyses are applied in the second HEXTRAN- SMABRE analyses, reported here. These three codes are developed at VTT.The 7TH BM consists of start-up of the sixth, isolated loop in VVER-440 plant. The isolated loop contains initially cold water without boric acid and start-up leads to somewhat asymmetrical core power increase due to feedbacks in the core. The analyses model is basically the VVER-440 plant model used for the 5th and 6th BMs at VTT. The modelling issues for this BM are reported and some evaluation against the earlier reported comparisons between the system codes is done.26th Symposium of AER on VVER Reactor Physics and Reactor Safety 38 10 – 14 October 2016, Helsinki, Finland