Document Type : Research Paper
Authors
1 Reactor and Nuclear Safety Research School
2 thermohydraulic
3 Faculty member\NSTRI
Abstract
Nowadays, Passive safety systems are of utmost importance to improve the safety and reliability of nuclear reactors. In a pool-type research reactor, In order to reduce the risk of core uncovering by avoiding any penetration in the pool bottom for pool outlet pipe, A siphon pipe and a penetration in the pool wall upper than the core level can be employed as the pool outlet pipe. To prevent complete drainage of pool water in the event of siphon pipe breaks, Applying a siphon breaker as a passive safety system is essential. For this purpose, In this research, Hydraulic analysis of the siphon breaker line passive safety system for a pool-type research reactor is performed using RELAP5/Mod3.2. Hydraulic analysis and modeling are performed for a 16-inch coolant outlet siphon pipe considering 16 inches and 8 inches break diameters and siphon breaker line diameters of 2, 2.5, 3 and 4 inches. As a result, The undershooting height in the break size of 16 inches and the siphon breaker line size of 4 inches is equal to -36.7 cm. In the break size of 8 inches and the siphon breaker line size of 2 inches, The undershooting height is equal to -51.4 cm. By comparing the results with reference experimental results, The maximum error is -3.1 cm and the minimum error is -0.1 cm. The obtained results show good agreement between the results of simulation and the experimental results
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