Determination of parameters of the environment for qualification of equipment of the Dukovany NPP. Post-accident parameters in the hermetic zone of Unit 1 for an accident associated with steam line rupture. Rev. 2

The thermal hydraulic parameters of the environment (pressure, temperature, relative humidity and water level on the floor) in the hermetic zone of the Dukovany NPP were analyzed for an accident associated with a steam line rupture in the hermetic zone. First, the behavior of the primary and secondary circuits during the accident was analyzed by the RELAP code, and based on the outflow curves for the leak from the steam line so obtained, the response of the hermetic compartments was analyzed by the MELCOR code. The accident was found to proceed fast, so that in half an hour the thermal hydraulic situation is relatively stabilized. The results are compared with those contained in the Preliminary Safety Report and the differences are discussed