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Keywords: uncertainty
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eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2019
ISBN: 978-0-8031-7659-1
... Technical standards are increasingly moving toward a requirement to understand and account for uncertainties in measurement. The need to quantify uncertainty, and to express it together with the measurement result, has been a focus for international standards for some time. In practice, this has...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2018
ISBN: 978-0-8031-7661-4
... The process of determining the uncertainty in the neutron fluence from the measured activity of a dosimetry monitor is reviewed and the importance of treating the energy-dependent correlation is illustrated using several representative neutron fields. The process of determining the uncertainty...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2018
ISBN: 978-0-8031-7661-4
... The fast neutron fluence and the corresponding uncertainty are important parameters for reactor pressure vessel lifetime. This article presents one model, under development at CEA (Commissariat à l’Energie Atomique et aux Energies Alternatives), that uses the deterministic code APOLLO3 ®...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2014
ISBN: 978-0-8031-7587-7
... to perform linear regression, lead to statistical uncertainty in the resulting crack lengths and J Ic . Statistical analysis of linear regression was used to quantify variability in compliance for different selection methods. A Monte Carlo simulation was conducted to propagate that variability...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2012
ISBN: 978-0-8031-7536-5
... In the 1980's the dosimetry community embraced the need for a high fidelity quantification of uncertainty in nuclear data used for dosimetry applications. This led to the adoption of energy-dependent covariance matrices as the accepted manner of quantifying the uncertainty data. The trend...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2012
ISBN: 978-0-8031-7536-5
... The approach of improved uncertainty-accounted conservative evaluation of vodo-vodyanoi energetichesky reactor (VVER) (reactor-) pressure-vessel (RPV) radiation loading parameters has been proposed. This approach is based on the calculational–experimental procedure, which takes into account C/E...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2012
ISBN: 978-0-8031-7536-5
... The adjusted parameters and response, and their respective posterior uncertainties and correlations, are presented explicitly as functions of all relevant prior correlations for the two parameters, one response case. The dependence of these adjusted entities on the various prior correlations...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2012
ISBN: 978-0-8031-7527-3
... Codes, standards and regulations require compliance with criteria stated as the results of tests or calculations. These results have associated uncertainty. This paper discusses different approaches to the use of uncertainty in the determination of compliance. In particular, most discussion...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2012
ISBN: 978-0-8031-7527-3
... products). This paper examines how various tools and methodologies can be used to quantify, improve, and control measurement uncertainty in fire tests, such as the ASTM E84 tunnel test. This paper also assesses uncertainty in the Steiner Tunnel using both a Gage Repeatability and Reproducibility (Gage r...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2012
ISBN: 978-0-8031-7527-3
... The SFPE Engineering Guide to Performance-Based Fire Protection defines “uncertainty” as “the amount by which an observed or calculated value might differ from the true value.” In engineering, there are two types of uncertainly: epistemic and aleatory. Epistemic uncertainty is uncertainty due...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2010
ISBN: 978-0-8031-7505-1
... In hygrothermal measurements a variety of sensors and data acquisition systems are used. Measurement uncertainty is always associated with the experimental work conducted using these devices. Although uncertainty analysis methodology has been well established, performing an uncertainty analysis...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2010
ISBN: 978-0-8031-7505-1
... This paper describes a small study carried out using a hygrothermal simulation tool to investigate the sensitivity of wall performance results to uncertainty in the amount of rain impinging on the wall. Design standards for hygrothermal analysis of proposed designs include methods for selecting...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2006
ISBN-10: 0-8031-3402-9
ISBN: 978-0-8031-3402-7
... conditions. In this paper, this Master Batch — Secondary Batch approach is critically assessed in terms of traceability and uncertainty of the certified absorbed energy. It is shown that the produced reference test pieces are fit-for-purpose: they meet the requirements of their intended use (indirect...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2003
ISBN-10: 0-8031-3451-7
ISBN: 978-0-8031-3451-5
... Uncertainty assessments of temperature measurements performed at Sandia National Laboratories fire test facilities typically focus on measurements using mineral-insulated, metal sheathed (MIMS), ungrounded junction, chromel-alumel (Type K) thermocouples (TCs). These TCs are used to observe...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2003
ISBN-10: 0-8031-3451-7
ISBN: 978-0-8031-3451-5
... shows that the gauge exhibits an noticeable time lag. The uncertainty of the measurement is analyzed, and an uncertainty model is put forth using the data obtained from the experiment. The uncertainty model contains contributions from 17 separate sources loosely categorized as being either from...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2003
ISBN-10: 0-8031-3451-7
ISBN: 978-0-8031-3451-5
... heat flux to the calorimeter as a function of time and location. The uncertainty in heat flux caused by three-dimensional effects is estimated using finite element computer simulations. A Monte Carlo uncertainty simulation is used to estimate the uncertainty in heat flux from propagated uncertainties...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2003
ISBN-10: 0-8031-3451-7
ISBN: 978-0-8031-3451-5
... Oxygen consumption calorimetry has been used for more than twenty years to determine the heat release rate from experimental fires. Several investigators have quantified the theoretical uncertainty of heat release rate measurements. Estimates of the precision of heat release tests based on round...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2003
ISBN-10: 0-8031-3455-X
ISBN: 978-0-8031-3455-3
... capabilities, new statistical methods, as well as decision analysis methods, there is a greater opportunity to employ decision support systems to address spatial variability, uncertainty, sampling efficiency, risk and cost-benefit needs. Several decision support systems have been developed in the past few...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2002
ISBN-10: 0-8031-2898-3
ISBN: 978-0-8031-2898-9
... The accuracy of the thermal transmittance, or U-factor, of a fenestration system measured in a building assembly thermal test facility depends upon the test apparatus, test conditions, operating procedure, and the specimen properties. By conducting the uncertainty analysis of a specific thermal...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2002
ISBN-10: 0-8031-2898-3
ISBN: 978-0-8031-2898-9
... sensitivity analysis, one can study how sensitive the solution of a problem based on the data confidence input and its reaction to a single parameter of uncertainty. It may also provide us the basis for simplifying some of the hygrothermal analyses by allowing us to use material properties...