Accuracy and Uncertainty Analysis of PSBT Benchmark Exercises Using a Subchannel Code MATRA

Table 1

MATRA models for an analysis of PSBT benchmark exercises.

Parameters	Values
(i) Two-phase flow models
Field equations	Homogeneous mixture
Subcooled boiling void fraction	Levy model
Bulk boiling void fraction	Modified Armand model
Two-phase friction multiplier	Armand model
(ii) Subchannel interaction models
Crossflow resistance factor	0.5
Turbulent mixing parameter for single-phase	0.04
Two-phase turbulent mixing model	EM model
(iii) Hydraulic Resistance Models
Bundle friction factor	0.184 Re^−0.2
Spacer grid loss factor (MV/NMV/SS)^(*)	1.0/0.7/0.4 [1]

(^*) MV: Mixing Vaned, NMV: Nonmixing Vaned, SS: Simple Support.