Analysis of the natural circulation flow map uncertainties in an integral small modular reactor

Hosseini, Seyed Ali; Akbari, Reza; Shirani, Amir Saeed; D'Auria, Francesco Saverio

doi:10.1016/j.nucengdes.2021.111156

Cited by 15 publications

(3 citation statements)

References 40 publications

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“…Several existing works using RELAP5 (Skolik et al, 2018a;Hosseini et al, 2021) have achieved good agreement with reference values at 100% power. However, data for lower powers at 75%, 50% and 15% are also available in the safety analysis report (NuScale Power LLC 2020c).…”

Section: Steady State Simulationmentioning

confidence: 69%

Steady-state thermal hydraulic modelling and turbine trip transient simulation of the NuScale integral pressurised water reactor using the ASTEC code

2022

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A steady state model of the NuScale reactor has been built using the thermal hydraulic module CESAR of the severe accident code ASTEC. Construction of the model was achieved through iterations based on convergence towards data provided by NuScale pertaining to important operating properties—core temperatures, coolant mass flow rate and secondary steam temperature—at 100% power (160 MW) and also at lower power levels. Good agreement with reference values was achieved to within 3% deviation. With a similar methodology, the previous model was adjusted to give a second steady state model meant to provide conservative initial conditions from which a turbine trip transient simulation would be performed. Sound agreement with literature was achieved, with maximum deviations of less than 1.8% for monitored parameters. Lastly, a turbine trip transient was simulated and compared to reference data from analyses performed with NRELAP5 and RELAP5/SCDAPSIM. The most important system behaviors and event timings are well captured and reproduced, with discrepancies arising from inevitable estimates made due to lack of information.

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Section: Steady State Simulationmentioning

confidence: 69%

Steady-state thermal hydraulic modelling and turbine trip transient simulation of the NuScale integral pressurised water reactor using the ASTEC code

2022

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“…This standardization also serves to readily facilitate learning from first-of-a-kind (FOAK) to Nth-of-a-kind (NOAK) plants, decrease on-site construction times, and in doing so mitigate the economic risk associated with delayed construction schedules. Integral components, such as steam generators and pressurizers integrated directly within pressure vessels, and passive safety systems eliminate the need for piping, pumps, and other superfluous equipment [17,18]. Carelli et al, provide an overview of the economic advantages of SMRs, in which they argue that the cost increases from economies of scale can be counterbalanced [19,20] As mentioned, the current regulations have been mainly established based on light water reactors; thus, the licensing process should be adopted for the advanced style of SMRs.…”

Section: Pre-licensingmentioning

confidence: 99%

“…Considering Table 3 and all successive applications of the BEPU approach for licensing purposes, it is proposed to extend the implementation area of BEPU covering possibly all the FSAR, where the analytical techniques are required [40]. In some new research papers it is afforded to utilize the best-estimate approach or quantifying uncertainties during case studies that are topics related to SMR technology as minor implications of BEPU [17,[41][42][43].…”

Section: Bepu Application Experiencesmentioning

confidence: 99%

Small Modular Reactors Licensing Process Based on BEPU Approach: Status and Perspective

et al. 2023

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The competitiveness of small modular reactors (SMRs) has been planned based on design simplification, short construction time, passive safety systems, and enabling self-financing by ramp-up construction. Due to the global energy challenges, SMRs have received pervasive attention from a wide range of researchers, designers, developers, stakeholders, and customers. Besides the many advantages related to the design of SMRs, there are challenges ahead of these reactors. SMR licensing is one of the most critical challenges in the front deployment of these reactors. This challenge stems from innovations in SMR designs and systems, such as modularity or deployment for desalination, energy storage, hydrogen production, process heat, and district heating. Due to the lack of experimental data and technical knowledge, the licensing challenges for non-water coolant SMRs are more complicated. Nearly all previous generation reactor licenses were based on conservative analysis while the decision-making methods based on best-estimate and realistic approaches have received more attention in recent years. Thus, the method known as the best estimate plus uncertainty (BEPU) approach is selected for licensing in some cases. At this time, using the BEPU approach in licensing for conventional NPPs is a mature technology and ready for industrial application. Nevertheless, because most previous reactors were licensed based on conservative methods, developers and even regulatory bodies resist re-assessments based on the BEPU approach, while using the choice of conventional conservative methods is a type of roll-back for next-generation SMRs. Thus, this work reviews the BEPU approach and clarifies the possibility of using this approach in the licensing process of SMRs. The lack of experimental data and tight coupling of phenomena along with uncertainty quantification are the main challenges ahead of using BEPU in the licensing process of SMRs.

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Experimental study of heat transfer in the complex space of small steel containment with a steam jet

Yuan

Wang

Xiong

et al. 2022

Annals of Nuclear Energy

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Analysis of the natural circulation flow map uncertainties in an integral small modular reactor

Cited by 15 publications

References 40 publications

Steady-state thermal hydraulic modelling and turbine trip transient simulation of the NuScale integral pressurised water reactor using the ASTEC code

Steady-state thermal hydraulic modelling and turbine trip transient simulation of the NuScale integral pressurised water reactor using the ASTEC code

Small Modular Reactors Licensing Process Based on BEPU Approach: Status and Perspective

Experimental study of heat transfer in the complex space of small steel containment with a steam jet

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