- Journal of Thermal Engineering
- Vol: 3 Issue: 3
- DESIGN BASIS ACCIDENT ANALYSIS OF A SMALL MODULAR REACTOR
DESIGN BASIS ACCIDENT ANALYSIS OF A SMALL MODULAR REACTOR
Authors : Fatih Aydogan
Pages : 1241-1258
Doi:10.18186/journal-of-thermal-engineering.323390
View : 11 | Download : 5
Publication Date : 2017-07-01
Article Type : Research
Abstract :The International Reactor Innovative and Secure (IRIS) is an integrated small modular reactor (SMR) designed by Westinghouse Electric Company and a consortium of organizations. It has a thermal electric power rating of 1000 MWth and an electric power rating of 335 MWe. Being an SMR that features a derivative pressurized water reactor design, it contains the core, upper plenum, lower plenum, pressurizer, reactor coolant pumps, and steam generators in a single reactor vessel. An important feature of the IRIS is passive safety systems. Passive safety systems don’t require mechanical/electrical inputs for operation and rely on natural laws, material properties, and stored internal energy for hazard mitigation. In this work, a RELAP5 model of IRIS was constructed. A small-break loss-of coolant accident (SBLOCA) is simulated where the six major stages of SBLOCA response: (i) break initiation; (ii) blowdown; (iii) vessel depressurization by condensation and automatic depressurization system (ADS); (iv) pressure equalization; (v) reactor vessel/containment vessel depressurization; and (vi) long-term cooling are demonstrated. This paper demonstrates how efficiently the passive cooling systems work in mitigating the hazard.Keywords : : Passive Safety Systems, IRIS, RELAP5, Small Modular Reactor, SBLOCA