Core draining: neutronics, fluid dynamics, and heat transfer

Transcription

1 July Hood River, OR Core draining: neutronics, fluid dynamics, and heat transfer

2 Main goals of this specific study 1. Quantify the time required to complete the drain 2. Assess the reactvity loss curve during draining 3. Evaluate the temperature evolution in the drain tanks, while decay heat is dissipated

3 Draining simulation 1. Quantify the time required to complete the drain 2. Assess the reactvity loss curve during draining 3. Evaluate the temperature evolution in the drain tanks, while decay heat is dissipated Analytical estimates via pressure drop correlations

4 Draining simulation 1. Quantify the time required to complete the drain 2. Assess the reactvity loss curve during draining 3. Evaluate the temperature evolution in the drain tanks, while decay heat is dissipated Analytical estimates via pressure drop correlations

5 Draining simulation 1. Quantify the time required to complete the drain 2. Assess the reactvity loss curve during draining 3. Evaluate the temperature evolution in the drain tanks, while decay heat is dissipated Analytical estimates via pressure drop correlations Numerical calculations via CFD-corrected correl. Full Computational Fluid Dynamics simulation

6 Draining simulation

7 Draining simulation

8 Draining simulation

9 Draining simulation Equivalent-area CFD simulation (VoF in OpenFOAM)

10 Draining simulation Equivalent-area CFD simulation (VoF in OpenFOAM)

11 Draining simulation Equivalent-area CFD simulation (VoF in OpenFOAM)

12 Draining simulation Equivalent-area CFD simulation (VoF in OpenFOAM)

13 Draining simulation Equivalent-area CFD simulation (VoF in OpenFOAM)

14 Draining simulation Equivalent-area CFD simulation (VoF in OpenFOAM)

15 Draining simulation Equivalent-area CFD simulation (VoF in OpenFOAM)

16 Draining simulation - CFD simulation

17 Draining simulation - CFD simulation

18 Draining simulation - pressure drop Pressure drop decomposition

19 Draining simulation

20 Draining simulation - results - flow rate Salt drain completes in minutes after opening of the freeze valves

21 Draining simulation - results - salt volume Salt drain completes in minutes after opening of the freeze valves

22 Main goals and tools of the study 1. Quantify the time required to complete the drain 2. Assess the reactvity loss curve during draining 3. Evaluate the temperature evolution in the drain tanks, while decay heat is dissipated Monte Carlo neutron transport simulations

23 Reactivity evolution

24 Reactivity evolution - rho vs fuel height

25 Reactivity evolution - rho vs time

26 Reactivity evolution - residual fiss. Pow. profile

27 Reactivity evolution - residual fiss. Pow. profile

28 Reactivity evolution - residual fiss. Pow. profile

29 Drain tank heat transfer study 1. Quantify the time required to complete the drain 2. Assess the reactvity loss curve during draining 3. Evaluate the temperature evolution in the drain tanks, while decay heat is dissipated Analytical estimates via view factor approach

30 Drain tank heat transfer study 1. Quantify the time required to complete the drain 2. Assess the reactvity loss curve during draining 3. Evaluate the temperature evolution in the drain tanks, while decay heat is dissipated Analytical estimates via view factor approach

31 Drain tank heat transfer study 1. Quantify the time required to complete the drain 2. Assess the reactvity loss curve during draining 3. Evaluate the temperature evolution in the drain tanks, while decay heat is dissipated Analytical estimates via view factor approach

32 Drain tank heat transfer study 1. Quantify the time required to complete the drain 2. Assess the reactvity loss curve during draining 3. Evaluate the temperature evolution in the drain tanks, while decay heat is dissipated Analytical estimates via view factor approach Full CFD simulation w/ radiative heat transfer

33 Geometry Simplified drain tank geometry for CFD study

34 Geometry Simplified drain tank geometry for CFD study

35 Geometry Simplified drain tank geometry for CFD study

36 CFD - Radiative heat transfer + natural circul.

37 CFD - Radiative heat transfer + natural circul.

38 CFD - Radiative heat transfer + natural circul.

39 CFD - Radiative heat transfer + natural circul.

40 CFD - Radiative heat transfer + natural circul.

41 CFD - Radiative heat transfer + natural circul.

42 CFD - Radiative heat transfer + natural circul.

43 CFD - Radiative heat transfer + natural circul.

44 CFD + analytical study - Results

45 CFD + analytical study - Results

46 CFD + analytical study - Results

47 CFD + analytical study - Results

48 CFD + analytical study - Results