[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) However, further studies on the pollination process in WOSR should help to refine this model.Reactor Pressure Vessel P-T Limit Curve Round RobinĮnergy Technology Data Exchange (ETDEWEB) This model can identify the impact of each of the factors that lead to the abortion of seeds and pods in WOSR, which include the position effect, assimilate competition and pollination limitation. Our results indicate that pollen germination is a factor that determines final seed number. Furthermore, the distribution parameters of the pollen number per stigma ( m) remained stable, and the probability of pod survival ( Bo) varied with different factors, including the year, pod rank and inflorescence position. This effect could be due to the competition for assimilates between the pods and seeds. Ramification-clipping treatment increased the number of ovules per ovary ( μ: 31 for control plants and 32 for clipped plants), the parameter k and the number of seeds per pod ( p). The mean number of seeds per pod on the main stem and the bottom ramification along the stem was larger than the other ramifications within one plant.
Inflorescence position influenced the number of ovules per ovary ( μ: 30.8–33.8 from top to bottom) and the parameter k. The proportion of effective pollen grains ( k) significantly decreased with pod rank at the end of the main stem. The year had no effect on the number of ovules per ovary ( μ) and the probability of seed viability ( p). The variations in the parameters were analysed according to the following four factors: year, pod rank, inflorescence position and ramification-clipping treatment. Experiments were done in Grignon (France) in 20. The generalised least squares method was implemented to estimate the model parameters using the experimental data. Here, we present a stochastic probabilistic model of seed development. As a result of the complexity of the developmental patterns of WOSR, it is challenging to identify the roles of various factors that influence seed production using an experimental approach. This study aimed to reproduce the process of seed development in WOSR based on a limited number of parameters.
Any difficulty during the process of seed production may result in seed or pod abortion. In winter oilseed rape (WOSR), only a subset of ovules can develop into seeds in the majority of pods.
0 kommentar(er)
