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

<div>Eigenvalue distribution of relative covariance matrix. Blue dots show the eigenvalue distribution of transformed logarithmic relative covariance. Red dots show the eigenvalue distribution of approximated relative covariance matrix searched by nearest-SPD algorithm. Grey lines show the relative difference of these eigenvalues.</div>

Science and Technology of Nuclear Installations

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Figure 11

Figure 11: Lognormal-Based Sampling for Fission Product Yields Uncertainty Propagation in Pebble-Bed HTGR 