HEAT DISSIPATION SYSTEM FOR A NUCLEAR REACTOR, IN PARTICULAR A PRESSURIZED WATER REACTOR

摘要

In order to increase the inherent safety of a nuclear power station, in particular a nuclear power station with a pressurized water reactor, an active or passive heat dissipation system is proposed. A safety tank (100) is surrounded by the concrete construction of a reactor building (5) and in turn surrounds the nuclear reactor as a confinement (2). The safety tank has in its bottom area a sump volume (3) for receiving cooling water (4). The cooling pipes (6) of a sump cooler (SC) are arranged inside the sump volume (3) in such a way that they are covered by the cooling water (4) at their primary side at least when sump volume (3) is largely filled. The secondary side (KII) of the cooling pipes (6) is connected to an intermediate cooler (g) by feeding and return lines (7, 12; 8, 11) of the sump cooler (SC). The intermediate cooler (9) is connected at the tertiary side to a heat sink (24; 28) arranged outside of the reactor building (5). Both the intermediate cooling circuit and the tertiary circuit may be operated with a natural circulation. In addition, means (10) for circulating cooling water (4) in the intermediate circuit through the sump cooler and the intermediate cooler (SC; 9) may be provided.