scholarly journals Performance assessment implementation plan for the geologic repository program

1990 ◽  
Author(s):  
MRS Advances ◽  
2019 ◽  
Vol 4 (17-18) ◽  
pp. 987-992
Author(s):  
François Diaz-Maurin ◽  
Rodney C. Ewing

ABSTRACTThe “safety case” approach has been developed to address the issue of evaluating the performance of a geologic repository in the face of the large uncertainty that results for evaluations that extend over hundreds of thousands of years. This paper reviews the concept of the safety case as it has been defined by the international community. We contrast the safety case approach with that presently used in the U.S. repository program. Especially, we focus on the role of uncertainty quantification. There are inconsistencies between the initial proposal to dealing with uncertainties in a safety case and current U.S. practice. The paper seeks to better define the safety case concept so that it can be usefully applied to the regulatory framework of the U.S. repository program.


2017 ◽  
Vol 28 (2) ◽  
pp. 161-169
Author(s):  
Rona Taula Sari

To improve and produce graduated students of SMK relevance with the needs of business and industry, which continues growing significantly, then the vocational curriculum should be designed and implemented  the developing competence. Teachers are required to be able to produce learners who are extremely competent and ready to face life's challenges with confidence and high self confidence through a process of meaningful learning that he personally experienced to be able to apply his knowledge in everyday life. Therefore, teachers should be able to design their own learning plan to be based on a curriculum that has been made by the government. Planning learning is an important part in the implementation of education at the school. One lesson plans to be prepared by the teachers is the Learning Implementation Plan (RPP).This type of research is descriptive quantitative research but generally is in the form of case studies. Data collection techniques used in relation to the learning plan in the form of Learning Implementation Plan (RPP) made by teachers in the value of using Instrument RPP (IPKG-1).Based on the results of research on science teaching in the classroom Planning XII-DKV in SMK N 4 Padang on subjects Ecosystem terms of format already referred to the Teacher Performance Assessment Instrument (IPKG-1). Learning materials and learning resources are the criteria are not good (1.00 to 1.99). Teacher Performance Assessment Instrument (IPKG-1) provide an assessment of achieving the expected unfavorable (2.00 to 2.99) for the indicator, learning activities, learning objectives, assessment of learning outcomes. Good enough category (3.00 to 3.49) for kompenen RPP in general, SK and KD, the allocation of time and learning methods. Identity RPP and KD can be implemented in one or more meetings were with the highest fourth in both categories. 


1993 ◽  
Vol 333 ◽  
Author(s):  
B.P. Mcgrail ◽  
D.W. Engel

ABSTRACTThe design and analysis of waste package and engineered systems for geologic disposal of radioactive wastes are being conducted in most countries with so-called performance assessment models and associated computer codes that solve the governing equations. The models range in complexity from simple 1-D analytical solutions to multidimensional, multicomponent reactive transport models implemented in large computer codes. Borosilicate waste glass is certainly the most studied and probably best understood waste form that has been developed for encapsulating high-level waste. Reasonably good models are available that describe the reaction kinetics and transformation of the glass into a paragenetic sequence of more stable secondary phases. Given the broad range of computational tools and extensive database on glass/water reactions that is available, it is surprising that little progress has been made to link these models and data in a comprehensive performance assessment of waste glass in a repository setting. In this paper, we will explore reasons why this linkage has not been developed, give several examples illustrating the importance of doing so, and illustrate an approach to accomplish such a linkage.


2004 ◽  
Vol 824 ◽  
Author(s):  
Christopher S. Palenik ◽  
Keld A. Jensen ◽  
Rodney C. Ewing

AbstractLicensing a geologic repository for nuclear waste will be based primarily upon the results of a performance assessment (PA), which evaluates compliance of the repository with radiation exposure limits by modeling the engineered and natural barrier systems over extended periods (104 to 106 years). The properly completed PA must include an analysis of the sources of uncertainty, as well as the range of input parameter values, in order to determine whether the analysis is “robust”, “realistic” or “conservative”. This paper examines the sources of uncertainty that may be encountered in source-term and near-field models in a performance assessment of a repository for spent nuclear fuel by examining the uncertainties in modeling the geochemical behavior of the Bangombé natural reactor in Gabon.


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