Analysis of loss of coolant accident without ECCS and DHRS in an integral pressurized water reactor using RELAP/SCDAPSIM

Skolik, Katarzyna; Allison, C.M.; Hohorst, J.K.; Malicki, Mateusz; Perez-Ferragut, Marina; Pieńkowski, L.; Trivedi, A.K.

doi:10.1016/j.pnucene.2021.103648

Cited by 16 publications

(2 citation statements)

References 27 publications

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“…The SG heat exchange area had to be drastically modified from the stated physical value. Other works using RELAP5 (Hoffer et al, 2011;Skolik et al, 2021) had also found this increase of 30% to be necessary for overall reactor quantities to fit correct values. Severe deviation in this heat exchange region is attributed to the need to compensate for 1-D simplification by system codes of the complex geometry, flow, and heat exchange in the once-through helical-coil SG region.…”

Section: Steady State Simulationmentioning

confidence: 87%

“…With a vast amount of information available on public domain, NuScale serves as a suitable subject of study and benchmark of different codes. Numerous studies have been performed, ranging from overall steady-state and transient characteristics using system codes (Yan et al, 2016;Skolik et al, 2021) to specific phenomena related to natural circulation, helical SG coils, boiling instabilities etc. with CFD methods (Che et al, 2020), and combinations of these (Hoffer et al, 2011;Kim et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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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: 87%