Abstract
SMART is a small-sized integral type PWR containing major components within a single reactor pressure vessel. Advanced design features implemented into SMART have been proven or qualified through experience, testing, or analysis according to the applicable approved standards. After Fukushima accident, a rising attention is posed on the strategy to cope with a Station Blackout (SBO) accident, which is one of the representative severe accidents related to the nuclear power plants. The SBO is initiated by a loss of all offsite power with a concurrent failure of both emergency diesel generators. With no alternate current power source, most of the active safety systems that perform safety functions are not available. The purpose of SBO analysis in this paper is to show that the integrity of the containment can be maintained during a SBO accident in the SMART (System-integrated Modular Advanced ReacTor). Therefore, the accident sequence during a SBO accident was simulated using the CINEMA-SMART (Code for INtegrated severe accidEnt Management and Analysis-SMART) code to evaluate the transient scenario inside the reactor vessel after an initiating event, core heating and melting by core uncovery, relocation of debris, reactor vessel failure, discharge of molten core, and pressurization of the containment. It is shown that the integrity of the containment can be maintained during a SBO accident in the SMART reactor. It has to be mentioned that the assumptions used in this analysis are extremely conservative that the passive safety systems of PSIS and PRHRS were not credited. In addition, as ANS73 decay heat with 1.2 multiplier was used in this analysis, actual progression of the accident would be much slow and amount of hydrogen generation will be much less.
Highlights
The Korea atomic energy research institute (KAERI) (Korea Atomic Energy Research Institute) started developing systemintegrated modular advanced reactor (SMART) (System-integrated Modular Advanced ReacTor) (IAEA, 2005; Kim et al, 2014) in 1997, aiming to export it to countries with small electric grids and water supply issues
The purpose of Station Blackout (SBO) analysis in this paper is to show that the integrity of the containment can be maintained during a SBO accident in the SMART
This paper describes the CINEMA-SMART calculation results of accident sequences in the reactor vessel and the containment when a SBO accident occurs in the SMART
Summary
The KAERI (Korea Atomic Energy Research Institute) started developing SMART (System-integrated Modular Advanced ReacTor) (IAEA, 2005; Kim et al, 2014) in 1997, aiming to export it to countries with small electric grids and water supply issues. When ADS valves are opened the RCS is rapidly depressurized below to 1.7 MPa. The accident scenario progresses to core melting, corium relocation to the lower plenum and, eventually, Reactor Pressure Vessel (RPV) failure. The oxidation corium is continuously relocated following accident progress, and at the time of the reactor vessel damage, it is expected that the oxidation corium eventually increases to about 12,980 kg resulting in a total of FIGURE 17 | Containment pressure in the UCA. As the operator action time to open ADS valves is increased, the heat up of fuel temperature showing the progress of severe accident is delayed. There is no sudden temperature increase following the reactor vessel break, and the temperature remains below 400 K with a maximum temperature of 321 K throughout the analysis period
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