These findings call recent studies into question that use the p-curve to infer that most published research findings are based on true effects in the medical literature and in a wide range of disciplines. We also demonstrate this problem using as practical example the evaluation of the effect of malaria prevalence on economic growth between 19. We show by means of simulations that even with minimal omitted-variable bias (e.g., unaccounted confounding) p-curves based on true effects and p-curves based on null-effects with p-hacking cannot be reliably distinguished. We analyze the p-curve for observational research in the presence of p-hacking. The p-curve, the distribution of statistically significant p-values of published studies, has been used to make inferences on the proportion of true effects and on the presence of p-hacking in the published literature. P-Curve and p-Hacking in Observational Research. In this paper, we developed both the deterministic and a risk-informed P-T limits curve for an APR1400 reactor using Appendix G of the ASME Code, Section XI and compare the results in terms of additional operational margin. The risk-informed P-T limits curve is known to provide more operational flexibility, particularly for reactor pressure vessels with relatively high irradiation levels and radiation sensitive materials. This alternative methodology provides a simple procedure to develop risk-informed P-T limits for heat up, cool down, and hydrostatic test events. Risk-informed means that we can consider insights from a probabilistic risk assessment by using this methodology. Recently, an alternative risk-informed methodology has been added in the ASME Code. Appendix G of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code, Section XI, provides deterministic procedures to develop the P-T limits curve for the reactor pressure vessel. We call it a pressure-temperature limits curve ( P-T limits curve). [KEPCO International Nuclear Graduate School, Ulsan (Korea, Republic of)Ī reactor pressure vessel (RPV) in a nuclear power plant has operational limits of pressure and temperature to prevent a potential drastic propagation of cracks due to brittle fracture. (author) 23 refs, 88 figs, 17 tabs.Īpplication of the risk-informed methodology for APR1400 P-T limits curve This report include the results of the comparison of the procedure and method used by the participants, and sensitivity study of the key parameters.
Each Participant used its own approach to construct the P-T limit curve and submitted the results, By analyzing the results, the reference procedure for the P-T limit curve could be established. The purpose of the round robin is to compare the procedure and method used in various organizations to construct P-T limit curve to prevent brittle fracture of reactor pressure vessel of nuclear power plants. This report is the summary of the analysis results for the P-T Limit Curve construction which have been subjected to the round robin analysis.
[Korea Electric Power Research Institute, Taejon (Korea) Reactor Pressure Vessel P-T Limit Curve Round RobinĮnergy Technology Data Exchange (ETDEWEB)
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