Unmitigated severe accident analysis for a PWR using MELCOR

Araújo, Nathália N.; Gual, Maritza Rodríguez; Maturana, Marcos Coelho; Martins, Marcelo Ramos

doi:10.1016/j.pnucene.2020.103461

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…To validate these parameters, a comparison with the design values was performed. The relative errors for a similar Nuclear Power Plant (NPP) using RELAP5/MOD2 [19][20], as presented by Araújo et al [17][18], were also relatively small.…”

Section: Steady State Resultsmentioning

confidence: 99%

“…Pressure Vessel (RPV), two hot legs supplying U-tube type vertical Steam Generators (SG), two cold legs -each loop equipped with three primary reactor coolant pumps (RCP), associated piping, and a pressurizer (PRZ). The specifics of the RCS nodalization are outlined in previous research (See Figure 1) [18].…”

Section: The Reactor Cooling System (Rcs) Is Represented By a Model F...mentioning

confidence: 99%

“…Additionally, the Burn packages are designed for the combustion of gases, comparing conditions within control volumes against criteria for deflagrations and detonations. Source : [18].…”

Section: Brief Description On Melcor Packagesmentioning

confidence: 99%

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Analysis of hydrogen control in a Small Modular Reactor during TLOFW severe accident

Gual,

Coelho Maturana,

Nunes Araújo

et al. 2024

Braz. J. Rad. Sci.

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During the Fukushima Daiichi nuclear accident in 2011, hydrogen explosions occurred in all units from Unit 1 to Unit 3. Consequently, one of the lessons learned from the Fukushima Daiichi accident is the necessity of implementing hydrogen control and mitigation strategies for most Nuclear Power Plants (NPPs). This paper focuses on the incorporation of Passive Autocatalytic Recombiners (PARs) during the design phase of a small modular Pressurized Water Reactor (SMR-PWR) project. The numerical analyses are conducted using the MELCOR v. 2.2 code. Two scenarios are compared: the Total Loss of Feed Water (TLOFW) severe accident with and without PARs. Saphiro’s diagram is utilized to investigate whether the mixture's composition (hydrogen, air, steam) is flammable for both scenarios. It has been observed that the inclusion of PARs leads to a reduction in hydrogen risk (detonative or deflagrative) as the final hydrogen concentration values fall below the flammability limit. This study is preliminary, and further research is required.

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Section: Steady State Resultsmentioning

confidence: 99%

Section: The Reactor Cooling System (Rcs) Is Represented By a Model F...mentioning

confidence: 99%