检索结果-南通市图书馆

Effect of Kinetic Parameters on I-129 Activity from Fuel to Coolant in PWRs

World Journal of Nuclear Science and Technology 2017年第4期7卷 284-291页

作者： rubina nasir Department of Physics Air University Islamabad Pakistan

Effect of kinetic model parameters on fission product (I-129) activity from fuel to coolant in PWRs has been studied in this work. First a computational model was developed for fission product release into primary coolant using ORIGEN-2 as subroutine. The model is based on set of differential equations of kinetic model which includes fuel-to-gap release model, gap-to-coolant leakage model, and Booths diffusion model. A Matlab based computer program FPAPC (Fission Product Activity in Primary Coolant) was developed. Variations of I-129 activity in Primary Heat Transport System were computed and computed values of i-129 were found in good agreement and deviations were within 2% - 3% of already published data values. Finally, the effects of coolant purification rate, diffusion constant and gas escape rate on I-129 activity were studied and results indicated that the coolant purification rate is the most sensitive parameter for fission product activity in primary circuit. For changes of 5% in steps from −10% to +10% in the coolant purification rate constant (Β), the activity variation after 200 days of reactor operation was 23.1% for the change.

关键词： Kinetic Model Fission Product Activity Coolant Purification Rate Diffusion Constant Gas Escape Rate PWRs I-129

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Evaluation of Corrosion Product Activity in a Typical PWR with Extended Cycles and Flow Rate Perturbations

引用

World Journal of Nuclear Science and Technology 2017年第1期7卷 24-34页

作者： rubina nasir Sikander M. Mirza nasir M. Mirza Department of Physics Air University Islamabad Pakistan Department of Physics & Applied Mathematics Pakistan Institute of Engineering & Applied Sciences Islamabad Pakistan

Effect of flow rate perturbations has been studied using the modified computer program CPAIR-P for time dependent corrosion rates in Pressurized Water Reactors (PWRs) having extended cycles. In these simulations, a decrease in the corresponding saturation values of corrosion product activity (CPA) is observed for higher pH values. Comparison of CPA’s behavior has been done for constant flow-rate case as well as for transients with elevated 10B levels (~40%) in dissolved boric acid in coolant in two operating cycles. When the flow rate is decreased in the first cycle, the saturation value of CPA attains new higher values. Also, in the second operating cycle, the saturation values are about 12% higher when compared with the values in the first cycle.

关键词： PWRs Corrosion Products Enriched Boric Acid Extended Cycles Flow Rate Perturbations

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

EXAFS Studies of Ruthenium Based Double Perovskite ALaMnRuO<sub>6</sub>(A = Ca, Sr, Ba)

引用

Materials Sciences and Applications 2012年第1期3卷 24-29页

作者： rubina Shaheen Javaid Bashir Muhammad nasir Khan 不详

Room and liquid nitrogen temperatures Mn K-edge extended X-ray fine structure (EXAFS) studies were carried out on powder samples of ALaMnRuO6 (A = Ca, Sr, Ba) perovskites. The EXAFS analysis of Mn K-edge spectra showed MnO6 octahedra are distorted. Among the three perovskites, the polyhedral distortion is highest for SrLaMnRuO6 (Δ = 1.4 × 10–3). For CaLaMnRuO6 (Δ = 0.5 × 10–3) and BaLaMnRuO6, (Δ = 0.7 × 10–3), the smaller values of distortion parameters indicate that the MnO6 octahedra are relatively regular and undistorted in the latter two systems. In SrLaMnRuO6, MnO6 distortion appears to be of orthorhombic (Q2) type whereas for CaLaMnRuO6 and BaLaMnRuO6, the distortion is of tetragonal or Q3 type. The Mn-O distances as determined from the EXAFS measurements, increases with the increase in the size of the divalent cation. No structural changes occurred in the local environment around Mn atom when the temperature was lowered from room to liquid nitrogen temperature.

关键词： A. Oxides A. Ceramics C. EXAFS D. Crystal Structure

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

EXAFS Studies of Ruthenium Based Double Perovskite ALaMnRuO6 (A = Ca, Sr, Ba)

引用

Materials Sciences and Applications（材料科学与应用期刊） 2012年第1期

作者： rubina Shaheen Javaid Bashir Muhammad nasir Khan

来源：评论

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：