Lognormal-Based Sampling for Fission Product Yields Uncertainty Propagation in Pebble-Bed HTGR

Table 6

Uncertainty analysis results and comparison of multiplication factor at equilibrium core state.

Sampling procedures	Nominal prediction V.S.O.P with ENDF/B-VII.1 posterior fission yields	Fission yield uncertainty analysis results
		Samples mean	Relative uncertainty	95% CI	Normality test^(2)
Normal	1.00106	1.00105	1.09E − 04	[1.05E − 04, 1.14E − 04]	Passed:
Lognormal	1.00106	1.00105	2.44E − 04	[2.44E − 04, 2.76E − 04]^(1)	Failed:
Comment	(1) 95% confidence interval is estimated by bootstrapping method with 100,000 bootstrap samples
	(2) Normality test is conducted on the z-scores of multiplication factor samples with the K-S test