A Coupled Calculation Suite for Atucha II Operational Transients Analysis

Figure 6

Schematic representation of the advancement of the simulation. DyPRA sets the “wait” semaphore of RELAP #1 to green, RELAP #1 computes one time step and sets the “ready” semaphore to green. Then, DyPRA moves on to the next RELAP, up to the last one. After that, it sets to green the “wait” semaphore and waits for the “ready” signal for both DYNETZ and PCE, in that order, and goes back to the first RELAP. Each code reads information from the correct shared memory segments after the “wait” semaphore has been turned to green and writes its output information to the memory before it sets the “ready” semaphore to green.