Estimates of Flow Rate of Pure Condensate when WWER-1200 Reactor Plant is Brought to the Minimum Controlled Power Level after the Emergency Protection Triggering

Abstract

Activation of the emergency protection entails the entering of boric acid solution into the reactor core to the parking value, then the control rods are raised, after which it is possible to obtain permission to start the reactor. The first stage of reaching the minimum controlled level (MCL) of power is feeding with pure condensate to the start-up interval at a high injection rate, the second is mixing the 1st circuit and then entering the pure condensate but at a low speed. At the same time, the technical regulations for safe operation indicate that the flow rate of pure condensate in the start-up interval should not exceed the flow rate of pure condensate to compensate for xenon poisoning by more than 10 t / h, and the input rate of positive reactivity should not exceed 0.02 βeff/min. At the same time, it is not entirely clear how to estimate the flow rate of pure condensate in the start-up interval, since there is no equipment on the power unit that measures the magnitude of xenon poisoning and the rate of reactivity input. This article will answer the question of what is the permissible flow rate of pure condensate the operator can use in the start-up interval in the presence of xenon processes.

Keywords

• ввэр-1200
• мку
• аварийная защита
• чистый конденсат
• технологический регламент безопасной эксплуатации