Investigation of a Coolant Mixing Phenomena within the Reactor Pressure Vessel of a VVER-1000 Reactor with Different Simulation Tools

Table 3

Comparison of TRACE predictions with plant data for the initial state.

Parameter	Initial state	Accuracy	TRACE	Deviation
Thermal power, MW	281	$\pm 60$	281	0
Pressure above core, MPa	15.593	$\pm 0.300$	15.592	0.001
Pressure drop over RPV, MPa	0.418	$\pm 0.043$	0.404	0.014
Coolant temperature at core inlet #1, K	541.75	$\pm 1.50$	541.78	$-0.03$
Coolant temperature at core inlet #2, K	541.85	$\pm 1.50$	541.88	$-0.03$
Coolant temperature at core inlet #3, K	541.75	$\pm 1.50$	541.78	$-0.03$
Coolant temperature at core inlet #4, K	541.75	$\pm 1.50$	541.78	$-0.03$
Coolant temperature at core outlet #1, K	545.00	$\pm 2.00$	544.63	0.37
Coolant temperature at core outlet #2, K	545.00	$\pm 2.00$	544.70	0.30
Coolant temperature at core outlet #3, K	544.90	$\pm 2.00$	544.61	0.29
Coolant temperature at core outlet #4, K	545.00	$\pm 2.00$	544.62	0.38
Mass flow rate of loop #1, kg/s	4737	$\pm 110$	4749	$-12$
Mass flow rate of loop #2, kg/s	4718	$\pm 110$	4735	$-17$
Mass flow rate of loop #3, kg/s	4682	$\pm 110$	4750	$-68$
Mass flow rate of loop #4, kg/s	4834	$\pm 110$	4737	97