Best estimate | Standard deviation. | Critical | U | |||||
---|---|---|---|---|---|---|---|---|

Linear | Exponential | Linear | Exponential | Linear* | Exponential^{†} | Linear | Exponential | |

Thermal conductivity dry (W m^{−1} °C^{−1}) | 0.26 | 0.30 | 0.02 | 0.02 | 0.256 | 0.263 | −0.15 | −1.81 |

Thermal conductivity wet (W m^{−1} °C^{−1}) | 0.96 | 1.10 | 0.12 | 0.12 | 0.715 | 0.915 | −1.99 | −1.48 |

Reliability index (β) | 2.0 | 2.34 | ||||||

Probability of failureP* = Φ(−β) | 0.023 | 0.0097 |

*U*, Set of uncorrelated, standardized normal variables (see equation 4);*A temperature of 150°C was reached after 2.91 years.

^{†}A temperature of 150°C was reached after 2.65 years.