Characteristics and Mechanisms of Debris Bed Formation Behavior in Severe Accidents of Sodium-Cooled Fast Reactors: Experimental and Modeling Studies
Abstract
:1. Introduction
2. Investigations Focusing on Overall Accumulated-Bed Characteristics
2.1. Investigations with Single-Sized and Single-Shaped Solid Particles
2.1.1. Experimental Materials and Methods
2.1.2. Experimental Results and Discussion
2.1.3. Modeling Studies
2.2. Investigations with Mixed Solid Particles
2.2.1. Experimental Materials and Methods
2.2.2. Experimental Results and Discussion
2.2.3. Modeling Studies
3. Investigations Focusing on Flow Regime Characteristics
3.1. Investigations with Single-Sized Spherical Particles
3.1.1. Experimental Materials and Methods
3.1.2. Experimental Results and Discussion
3.1.3. Modeling Studies
3.2. Investigations with Single-Sized Non-Spherical Particles
3.2.1. Experimental Materials and Methods
3.2.2. Experimental Results and Discussion
3.2.3. Modeling Studies
3.3. Investigations with Mixed-Sized Spherical Particles
3.3.1. Experimental Materials and Methods
3.3.2. Experimental Results and Discussion
3.3.3. Modeling Studies
3.4. Investigations on the Effect of Coolant Boiling Caused by Accumulated Debris
3.4.1. Experimental Studies Using the Gas-Injection Method
3.4.2. Experimental Studies Using the Bottom-Heated Method
- (1)
- For the non-bubbling cases, pool convection is triggered by the falling particle jet and, thus, is limited within the center area. Therefore, the particles are driven away inside a relatively small region (such as around the two apexes of the bed). While for bubbling cases, due to the rather uniform distributions of bubbles in the pool, the influence area of pool convection is deemed to be wider.
- (2)
- Although increasing the water depth was found to generally enhance pool convection under non-bubbling conditions, for boiling conditions at a constant heating power, due to the larger water mass and the potentially enhanced heat dissipation resulting from larger heat-transfer areas within the environment, a higher water depth might also lead to reduced bubbling rate, thereby reducing the overall intensity of pool convection to some extent [71].
3.5. Investigations on the Effect of Coolant Boiling Caused by Falling Debris
3.5.1. Experimental Materials and Methods
3.5.2. Experimental Results and Discussion
3.5.3. Modeling Studies
4. Conclusions
5. Discussion of Future Prospects
- (1)
- Further analyses and validations of DBF characteristics in cases of multicomponent (i.e., more than three components) mixed-sized particles. As noted in Section 2 and Section 3, previous investigations under mixed-sized spherical particle conditions were carried out by only using bicomponent or a few tricomponent mixed-sized particle mixtures. To attain more reliable insights into DBF behavior under more realistic particulate situations, more experimental studies, as well as corresponding modeling verifications, with three (or even more) component mixed-size solid particles can be conducted.
- (2)
- Further experimental investigations on the characteristics of particle separation and stratification under mixed-size particle conditions. As mentioned in Section 3, from experiments focusing on flow regime characteristics, it was implied that the stratifications and separations of different particle components in the mixtures, which may affect the coolability of the debris beds, can possibly appear under some specific accident situations (e.g., significant sodium boiling) as a result of the differences in component inertia. Therefore, to study the characteristics of particle separations and stratifications, experiments using mixed-size particles can be carried out under the gas-injection method, which can effectively simulate the violent sodium boiling conditions.
- (3)
- Further experimental and modeling studies under mixed-density conditions. For the experimental studies, although fundamental mixed-density influences were preliminarily investigated through several experiments focusing on accumulated-bed characteristics, it is necessary to point out that due to the rather limited experimental parametric conditions and non-visual experimental processes, some potential valuable experimental evidence may have been missed. Therefore, mixed-density experiments should be continuously performed under more realistic parametric situations (e.g., smaller particle size and particle mixtures composed of components with densities comparable to the densities of debris in actual reactor accidents (such as MOX fuel and SS)) and in a visual quasi-2D water tank to study in detail the flow regime mechanism under mixed-density particle conditions. Again, since the particle inertia for mixed-density particle components is different, it is reasonable to imagine that particle separation and stratification phenomena may also be found and investigated in bubbling cases with mixed-density particles. Further, for the modeling studies, referring to the modeling developments regarding the molten-pool sloshing and debris bed self-leveling behaviors [81,82], some effective (or equivalent) density to estimate the overall density of the particle mixture can be tested by employing the base model. Further, the establishment of an extension scheme that can appropriately take the mixed-density effect into account can also be attempted.
- (4)
- Further modeling studies for bubbling conditions. To continuously extend the model’s predictability, an extension scheme can be developed for bubbling conditions. Preliminarily, considering the gas-injection cases, the modeling frameworks can be developed as follows:Here, it is also noted that the gas flow rate considered in our previous investigations may not cover the possible range of vapor flow rates from the drastic boiling induced by the accumulated debris beds in an actual CDA of an SFR [59,83]. Therefore, further experiments with wider ranges of gas flow rates may also be necessary to ensure the predictability of the extended model under accidental conditions.
- (5)
- Further investigations under large-scale 3D conditions. Although essentially consistent parametric effects on characteristics of DBF were confirmed in both 2D flow regime and 3D accumulated-bed experiments, it should be highlighted again that an insufficiently large range of parameters for the 3D accumulated-bed experiments in the comparison to that of actual accident conditions may cause the loss of valuable evidence (such as additional variation in particle bed shape). Through elaborately performing the large-scale 3D experiments, insights obtained from 2D flow-regime experiments are expectable to be further verified under the large-scale 3D conditions. It can be expected that a more applicable and dependable empirical model associating the flow regime and accumulated-bed characteristics can be developed for application in reactor safety assessments. In fact, referring to the previous modeling studies on debris bed self-leveling behavior [14,84], it can be expected that the flow regime boundary lines (or empirical constants) determined for the predictive model under 2D conditions can possibly vary to some degree for large-scale 3D predictions. Such a predictive model is supposed to be useful in the improved designs of in-vessel core catchers along with the developments and validations of SFR safety analysis codes.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
Nomenclature
A | area | ρ | density |
Ar | Archimedes number | σ | surface tension |
C | specific heat | ϕ | particle sphericity |
D | diameter of experimental device | ψ | quantities for characterizing |
d | diameter | bubbling impact on restricting the | |
mean diameter | particle-flow induced pool convection | ||
Fr | Froude number | Ω | degree of convergence in particle |
g | gravitational acceleration | size distribution | |
H | height | ||
hlg | latent heat of liquid | Subscripts | |
L | length of experimental device | a | stands for an area mean term |
m | mass | B | boiling |
P | heating power | b | particle bed |
ΔP | pressure-drop | c | critical value |
Q | flow rate | dim | dimple |
Re | Reynolds number | ev | stands for a volume-equivalent term |
T | temperature | f | fluid |
t | the time span between the first and last particles | g | gas |
that flows out of the particle-releasing nozzle | in | inner container | |
U | superficial velocity | ip | represents an initial value of particle |
V | volume | j | j-th size particles |
v | velocity | L | left |
VT | particle terminal velocity | l | liquid |
VTS | terminal velocity of a spherical particle with the | m | particle mound |
volume-equivalent diameter of non-spherical particle | n | nozzle | |
W | width of experimental device | p | particle |
pr | particle releasing | ||
Greek symbols | R | right | |
ε | bed voidage | r | repose |
θ | angle | tank | water tank |
λ | thermal conductivity | v | stands for a mean volume term |
μ | viscosity | w | water |
Abbreviation | |||
CDA | Core Disruptive Accident | PAHR | Post-Accident Heat Removal |
DBF | Debris Bed Formation | PAMR | Post-Accident Material Relocation |
IGCAR | Indira Gandhi Centre for Atomic Research | SFR | Sodium-cooled Fast Reactor |
IVR | In-Vessel Retention | SS | Stainless Steel |
JAEA | Japan Atomic Energy Agency | SYSU | Sun Yat-Sen University |
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Physical Quantities | Condition | ||
---|---|---|---|
Reactor Accident | Experiments Focusing on Overall Accumulated-Bed Characteristics | Experiments Focusing on Flow-Regime Characteristics | |
Material of debris | Mixture of MOX fuel and SS | Al2O3, ZrO2, and SS | Glass, Al2O3, ZrO2, SS, Cu, and Pb |
Density of debris (kg/m3) | 7620 (SS)∼10,800 (MOX fuel) at 1000 K | 3600 (Al2O3), 6000 (ZrO2), 7800 (SS) at 298 K | 2600 (Glass), 3600 (Al2O3), 6000 (ZrO2), 7900 (SS), 8900 (Cu), and 11,340 (Pb) at 298 K |
Diameter of debris | 0.1 mm to several millimeters | 1.1~6.0 mm | 0.125~8.0 mm |
Liquid coolant | Sodium | Water | Water |
Coolant density (kg/m3) | 830 | 997 | 997 |
Viscosity (Pa.s) | 2.40 × 10−4 | 8.91 × 10−4 | 8.91 × 10−4 |
Modeling for Single-Sized and Single-Shaped Solid Particle Cases | Modeling for Mixed Solid Particle Cases | ||
---|---|---|---|
Empirical Constant Index | Value | Empirical Constant Index | Value |
a1 | −0.425 | a2 | 1.36 |
b1 | −0.103 | b2 | 3.76 |
c1 | −0.407 | c2 | 0.589 |
d1 | −0.161 | d2 | −0.661 |
e1 | −0.585 | e2 | −1.60 |
f1 | 0.456 | f2 | −0.545 |
g1 | 0.035 | g2 | 0.490 |
h1 | −0.137 | k2 | 162,755 |
k1 | 0.2049 |
Empirical Constant | Value |
---|---|
a | 1.20 |
b | 0.60 |
c | 0.90 |
d | 1.05 |
KB | 1.01 × 10−8 |
s1 | 65.5 |
s2 | 0.263 |
s3 | 0.441 |
p1 | 122.451 |
p2 | 0.555 |
p3 | 0.625 |
r1 | 0.016 |
r2 | 1.295 |
r3 | 0.012 |
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Xu, R.; Cheng, S. Characteristics and Mechanisms of Debris Bed Formation Behavior in Severe Accidents of Sodium-Cooled Fast Reactors: Experimental and Modeling Studies. Appl. Sci. 2023, 13, 6329. https://doi.org/10.3390/app13116329
Xu R, Cheng S. Characteristics and Mechanisms of Debris Bed Formation Behavior in Severe Accidents of Sodium-Cooled Fast Reactors: Experimental and Modeling Studies. Applied Sciences. 2023; 13(11):6329. https://doi.org/10.3390/app13116329
Chicago/Turabian StyleXu, Ruicong, and Songbai Cheng. 2023. "Characteristics and Mechanisms of Debris Bed Formation Behavior in Severe Accidents of Sodium-Cooled Fast Reactors: Experimental and Modeling Studies" Applied Sciences 13, no. 11: 6329. https://doi.org/10.3390/app13116329
APA StyleXu, R., & Cheng, S. (2023). Characteristics and Mechanisms of Debris Bed Formation Behavior in Severe Accidents of Sodium-Cooled Fast Reactors: Experimental and Modeling Studies. Applied Sciences, 13(11), 6329. https://doi.org/10.3390/app13116329