每年出版 8 期
ISSN 打印: 2150-3621
ISSN 在线: 2150-363X
Indexed in
ACTUATION ALGORITHM OF THE AUTONOMOUS PASSIVE RESIDUAL HEAT REMOVAL THERMOSIPHON SYSTEM FOR WWER REACTORS
摘要
The basic precondition for operation of the passive residual heat removal system (PRHRS) is its passive actuation in conditions of blackout transient of nuclear power plants (NPP) to ensure the safety of the reactor. Following the blackout, which is an initiating event, actuation of the PRHRS should be based on natural phenomena, independent of the availability of the external power and/or operator's intervention. The article deals with the actuation algorithm of the passive residual heat removal system of the water–water energy reactor (WWER). The main feature of the system under consideration is the organization of the residual heat removal directly from the primary circuit (PRHRS-R). PRHRS-R is autonomous, consequently its operation does not depend on the condition and availability of the principal equipment of the reactor island – the steam generators (SG). For residual heat removal the PRHRS-R is equipped with heat exchangers composed of a closed-cycle evaporation–condensation devices − two-phase thermosiphons (TPTS). The use of TPTS provides an efficient heat sink and a reliable separation of the primary circuit and of the final heat absorber. The PRHRS-R connection to the reactor installation is presented, the main stages of passive actuation of the system are considered and analyzed. The evaluation of the heat removal efficiency of PRHRS-R and the duration of the corresponding stages of its commissioning is based on the results of analytical modeling using RELAP5/Mod3.4 Code. The actuation of the PRHRS-R is compared with the actuation of the PRHRS-SG of the state of the art WWER Generation 3+ designs, where the passive removal of residual heat is carried out through the secondary side.