Effect of inlet throttling on thermohydraulic instability in a large scale water-based RCCS: A system-level analysis with RELAP5-3D
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
This paper presents results from system-level modeling of a water-based reactor cavity cooling system using RELAP5-3D. The computational model is benchmarked with experimental data from a half-scale RCCS test facility at Argonne National Laboratory. The model prediction is first compared with a two-phase oscillatory baseline experimental case where mixed accuracy is obtained. The model shows reasonable prediction of mass flow rate, pressure, and temperature but significant overprediction of void fraction. The model prediction is then compared with a fault case where the inlet of the risers is gradually reduced using a throttling valve. As the valve is closed, the model is able to predict some major flow phenomena observed in the experiment such as the dampening of oscillations, the reintroduction of oscillations, as well as boiling, flashing, and geysering in the risers. However, the timeline of these events are not well captured by the model. The model is also used to investigate the evolution of flow regime in the chimney. This work highlights that the semiempirical constitutive relations used in RELAP-3D could have a strong influence on the accuracy of the model in two-phase oscillatory flows.
Abstract
This paper presents results from system-level modeling of a water-based reactor cavity cooling system using RELAP5-3D. The computational model is benchmarked with experimental data from a half-scale RCCS test facility at Argonne National Laboratory. The model prediction is first compared with a two-phase oscillatory baseline experimental case where mixed accuracy is obtained. The model shows reasonable prediction of mass flow rate, pressure, and temperature but significant overprediction of void fraction. The model prediction is then compared with a fault case where the inlet of the risers is gradually reduced using a throttling valve. As the valve is closed, the model is able to predict some major flow phenomena observed in the experiment such as the dampening of oscillations, the reintroduction of oscillations, as well as boiling, flashing, and geysering in the risers. However, the timeline of these events are not well captured by the model. The model is also used to investigate the evolution of flow regime in the chimney. This work highlights that the semiempirical constitutive relations used in RELAP-3D could have a strong influence on the accuracy of the model in two-phase oscillatory flows.
참고문헌 (35)
- C. Wang, "A hybrid porous model for full reactor core scale CFD investigation of a prismatic HTGR", Ann. Nucl. Energy, 151, pp.107916~ (2021)
- Final project report on RCCS testing with air-based NSTF, "D. Lisowski", Argonne National Laboratory, ~, pp.ANL-ART-47 (2016)
- K. Fukuda, "Classification of two-phase flow instability by density wave oscillation model", J. Nucl. Sci. Technol, 16(2), pp.95~108 (1979)
- D. Lisowski, "Influences of boil-off on the behavior of a two-phase natural circulation loop", Int. J. Multiphase Flow, 60, pp.135~148 (2014)
- Y. Zhao, "Simulation investigation on flashing-induced instabilities in a natural circulation system", Ann. Nucl. Energy, 144, pp.107561~ (2020)
- M. Furuya, "Flashing-induced density wave oscillations in a natural circulation BWR—mechanism of instability and stability map", Nucl. Eng. Des, 235(15), pp.1557~1569 (2005)
- J. H. Chiang, "Fundamental study on thermohydraulics during start-up in natural circulation boiling water reactors,(III) effects of system pressure on geysering and natural circulation oscillation", J. Nucl. Sci. Technol, 31(9), pp.883~893 (1994)
- C. P. Marcel, "Experimental and numerical investigations on flashing-induced instabilities in a single channel", Exp. Therm. Fluid Sci, 33(8), pp.1197~1208 (2009)
- C. P. Marcel, "Experimental investigations on flashing-induced instabilities in one and two-parallel channels : A comparative study", Exp. Therm Fluid Sci, 34(7), pp.879~892 (2010)
- T. Zhang, "Linear stability analysis of flashing instability based on the homogeneous equilibrium model", Nucl. Eng. Des, 373, pp.110994~ (2021)
- L. C. Ruspini, "Two-phase flow instabilities : A review", Int. J. Heat Mass Transfer, 71, pp.521~548 (2014)
- S. Shi, "Assessment of RELAP5", MOD3. 2 for startup transients in a natural circulation test facility, 2018, pp.112, 257~266
- M. L. De Bertodano, "Two-Fluid Model Stability, Simulation and Chaos" (2017), Springer
- Q. Wang, "An investigation on flashinginduced natural circulation instabilities based on RELAP5 code", Ann. Nucl. Energy, 121, pp.210~222 (2018)
- C. Teng, "Assessment of RELAP5", MOD3. 2 for simulating density wave oscillation with a two-phase natural circulation test facility, 2021, pp.381, 111358~
- "Generation IV nuclear energy system initiative; air-cooled option RCCS studies and NSTF preparation"[URL]
- "Experimental Studies of NGNP Reactor Cavity Cooling System With Water"[URL]
- R. Vaghetto, "Modeling the thermal–hydraulic behavior of the reactor cavity cooling system using RELAP5-3D", Ann. Nucl. Energy, 73, pp.75~83 (2014)
- FY21 progress on computational modeling of the water-based NSTF, "Q. Lv", Argonne National Laboratory, ~, pp.ANL-ART-235 (2021)
- Water NSTF design, instrumentation, and test planning, "D. Lisowski", Argonne National Laboratory, ~, pp.ANL-ART-98 (2017)
- RCCS testing with the water-based NSTF: Year-1 single-phase results, "D. Lisowski", Argonne National Laboratory, ~, pp.ANL-ART-175 (2019)
- Report on year-2 of water NSTF matrix testing: Two-phase baseline and repeatability, "D. Lisowski", Argonne National Laboratory, ~, pp.ANL-ART-206 (2020)
- Report on year-3 of water NSTF matrix testing: Two-phase parametric test series, "Q. Lv", Argonne National Laboratory, ~, pp.ANL-ART-230 (2021)
- RELAP5, RELAP5-3D code manual volume IV: Models and correlations, , Idaho National Laboratory, ~, pp.INL (2015), MIS-15-36723
- Progress report on computational analyses of water-based NSTF, "Q. Lv", Argonne National Laboratory, ~, pp.ANL-ART-103 (2017)
- Z. Ooi, "Modeling of a Large Scale RCCS Operating at Two-Phase Transient Conditions with RELAP5-3D", 2022 ANS Winter Meeting and Technological Expo (2022)
- "FY22 progress on computational modeling of the water-based NSTF, Tech. Rep. ANL-ART-257" (2022)[URL]
- M. S. Plesset, "The growth of vapor bubbles in superheated liquids", J. Appl. Phys, 25(4), pp.493~500 (1954)
- K. Lee, "The evaporation of water droplets in superheated steam", J. Heat Transfer, 90(4), pp.445~451 (1968)
- W. Fullmer, "Validation of RELAP5", MOD3.3 for subcooled boiling, flashing and condensation in a vertical annulu, 2016, pp.93, 205~217
- Z. Ooi, "Validation of the interfacial area transport equation coupled with the void transport equation for prediction of flashing flows", Nucl. Sci. Eng, 194(8–9), pp.598~619 (2020)
- Z. Ooi, "Two-group interfacial area transport equation coupled with void transport equation in adiabatic steam water flows", Int. J. Heat Mass Transfer, 177, pp.121531~ (2021)
- A. Mangal, "Capability of the RELAP5 code to simulate natural circulation behavior in test facilities", Prog. Nucl. Energy, 61, pp.1~16 (2012)
- FY23 report on water NSTF testing at two-phase conditions: Off-normal scenarios, "Q. Lv", Argonne National Laboratory (ANL), ~, pp.ANL-ART-274 (2023)
- M. Furuya, "Inlet throttling effect on the boiling two-phase flow stability in a natural circulation loop with a chimney", Heat Mass Transf, 37(2–3), pp.111~115 (2001)