Complex phenomena as waterhammer transients occurring in nuclear power plants are still not very well investigated by the current best estimate computational tools. In this framework a rapid positive reactivity addition into the core generated by a waterhammer transient during the Peach Bottom BWR Turbine Trip experiment 2 is considered. The numerical simulation of such phenomena was carried out using the coupled RELAP5/PARCS code. An overall data comparison shows good agreements between the calculated and measured core pressure wave trend. However, the predicted power response during the excursion phase did not match correctly the experimental tendency. For this purpose, sensitivity studies have been carried out in order to identify the most influent parameters that govern dynamics of the power excursion. After investigating the pressure wave amplitude and the void feedback responses, it was found out that the disagreement between the calculated and measured data occurs mainly due to the RELAP5 low void condensation rate, which seems to be questionable during rapid transients.

Analysis of a waterhammer induced reactivity addition effect on the Peach Bottom BWR core dynamics

D'AURIA, FRANCESCO SAVERIO
2005-01-01

Abstract

Complex phenomena as waterhammer transients occurring in nuclear power plants are still not very well investigated by the current best estimate computational tools. In this framework a rapid positive reactivity addition into the core generated by a waterhammer transient during the Peach Bottom BWR Turbine Trip experiment 2 is considered. The numerical simulation of such phenomena was carried out using the coupled RELAP5/PARCS code. An overall data comparison shows good agreements between the calculated and measured core pressure wave trend. However, the predicted power response during the excursion phase did not match correctly the experimental tendency. For this purpose, sensitivity studies have been carried out in order to identify the most influent parameters that govern dynamics of the power excursion. After investigating the pressure wave amplitude and the void feedback responses, it was found out that the disagreement between the calculated and measured data occurs mainly due to the RELAP5 low void condensation rate, which seems to be questionable during rapid transients.
2005
2951619502
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/93651
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