Science and Technology of Nuclear Installations / 2019 / Article / Tab 1

Research Article

Analysis of the Effect of Severe Accident Scenario on Debris Properties in Lower Plenum of Nordic BWR Using Different Versions of MELCOR Code

Table 1

MELCOR modeling parameters.

MELCOR 1.86 [18, 19]MELCOR 2.1 [20, 21]MELCOR 2.2 [1, 2]

Gap Thickness (m)0.075e-30.0[26]0.0[26]

Velocity of Falling Debris (m/s)Default 1.0.
0.1 value was used in MELCOR 1.86 calculations [12, 24].
0.01[26]0.01[26]

Particulate debris porosity (-)0.25[34]0.4[26]0.4[26]

Particulate debris equivalent diameter in LP (m)0.020.002[26]0.002[26]

The max. molten Zr breakout flow rate (SC1141(2)) (kg/m-s)1.00.20.2

COR-package candling heat transfer coefficient.
(W/m2-K)
HFRZUO, HFRZZR, HFRZSS, HFRZZX, HFRZSX, HFRZCP10007500
7500
2500
7500
2500
2500
7500
7500
2500
7500
2500
2500

COR package radiative heat transfer parameters (FCELR, FCELA)0.25
0.25
0.1
0.1
0.1
0.1

COR package min. porosity for flow (SC1505(1) – COR package, SC4413(5) – CVH package) and heat transfer SC1505(2) calculations.0.001
1.e-6
0.001
0.05
0.05
0.05
1.e-5[25].
0.05
0.05

Zircaloy Oxidation Rate Constant Coefficients by Oxygen(SC1001(1-2,2)),
(see [1821] for details)
50.4 Kg2(Zr)/m4-s
14630.0 K
26.7 Kg2(Zr)/m4-s
17490.0 K
26.7 Kg2(Zr)/m4-s
17490.0 K

Conduction enhancement for molten components (SC1250(1))3200K2800K2800K

Minimum fraction of the initial volume available to hydrodynamic materials (SC4414)0.0010.010.01

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