Approaches, Relevant Topics, and Internal Method for Uncertainty Evaluation in Predictions of Thermal-Hydraulic System Codes

Table 2

CIAU method: subdivision of driving quantities into intervals.

PWR-DRIVING QUANTITIES		(1) Upper plenum pressure (MPa)	(2) Primary circuit mass inventory (%)^(a)	(3) Steam generator pressure (MPa)	(4) Cladding temperature (K)	(5) Core power (%)^(a)	(6) Steam generator level (%)^(a)
Hypercube intervals	1	0.09–0.5	10–40	0.1–3.0	298–473	0.5–1.0	0–50
	2	0.5–2.0	40–80	3.0–7.0	473–573	1.0–6.0	50–100
	3	2.0–4.0	80–100	7.0–9.0	573–643	6.0–50	100–150
	4	4.0–5.0	100–120	—	643–973	50–100	—
	5	5.0–7.0	—	—	973–1473	100–130	—
	6	7.0–9.0	—	—	—	—	—
	7	9.0–10.0	—	—	—	—	—
	8	10.0–15.0	—	—	—	—	—
	9	15.0–18.0	—	—	—	—	—

^(a)Percent of the initial (nominal) value.