New Generation of Diamond Toolings for Facilitating Decommissioning Operations

2011 ◽  
Author(s):  
Claude Besson ◽  
Erico Mariotti ◽  
Alexandre Mouysset ◽  
Lorenz zur Nedden ◽  
Bernard Delannay
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Nuclear Plant ◽  
Diamond Tools ◽  
Nuclear Decommissioning ◽  
Specialized Equipment ◽  
New Generation

Diamond tools are well proven cutting, drilling and grinding technologies in many applications but need to be specifically optimized and adapted for the complex and varied structures of nuclear power plant in view of decontamination and decommissioning. The proper development and use of diamond tools in these extreme and complex conditions can only be achieved thanks to the combined talent of experienced nuclear plant contractors, engineers, technicians, operators of diamond tools, and the use of specialized equipment. This present paper is an overview of the possible applications of diamond tools in the different operations of Nuclear Decommissioning and Decontamination.

Design Concept of Composite Module for Nuclear Power Plant Construction

2004 ◽  
Author(s):  
Taihei Yotsuya ◽  
Kouichi Murayama ◽  
Jun Miura ◽  
Akira Nakajima ◽  
Junichi Kawahata
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Large Scale ◽  
Construction Method ◽  
Nuclear Plant ◽  
Small Scale ◽  
Modular Construction ◽  
Plant Construction ◽  
Composite Module

A composite module construction method is to be examined reflecting one of the elements of construction rationalization of a future nuclear plant planned by Hitachi. This concept is based on accomplishments and many successes achieved by Hitachi through application of the modular construction method to nuclear power plant construction over 20 years. The feature of the composite module typically includes a planned civil structure, such as a wall, a floor, and a post, representing modular components. In this way, an increased level of rationalization is expected in the conventional large-scale nuclear plants. Furthermore, the concept aiming at the modularization of all the building parts comprising medium- or small-scale reactors is also to be examined. Additional aims include improved reductions in the construction duration and rationalization through use of the composite module. On the other hand, present circumstances in nuclear plant construction are very pressing because of economic pressures. With this in mind, Hitachi is pursuing additional research into the introduction of drastic construction rationalization, such as the composite module. This concept is one of the keys to successful future plant construction, faced with such a severe situation.

Russia will drop nuclear plans unless Turks buy in

2016 ◽  
Keyword(s):  
Power Generation ◽  
Power Plant ◽  
Nuclear Power Plant ◽  
Air Force ◽  
Nuclear Power ◽  
Nuclear Plant ◽  
Content Type ◽  
Bilateral Relations

Subject The Akkuyu nuclear plant that Turkey is building with Russia's Rosatom. Significance Since the Turkish air force downed a Russian warplane last November, bilateral relations have plunged to an all-time low. Rumours persist that Moscow has frozen funding for the Akkuyu nuclear power plant (NPP) and is unwilling to complete the project unless it can share the risk. Impacts Continued development would be an added incentive for Ankara and Moscow to repair relations. Abandoning the project would further strain relations between Ankara and Moscow. Turkey may look for other developers to complete the NPP while prioritising other forms of power generation.

A Nuclear Paradise

Kudankulam ◽  
2020 ◽  
pp. 32-70
Author(s):  
Raminder Kaur
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Middle Class ◽  
Nuclear Fuel ◽  
Nuclear Power ◽  
Background Radiation ◽  
Nuclear Plant ◽  
Peninsular India ◽  
Visual Material ◽  
Alternative Sources

Chapter 2 grounds the study in an exploration of the ecological, material, and social contours of the region. It focuses on the backstories of Kudankulam as the site for a nuclear plant and the spaces of criticality that were generated. The formidable presence of the nuclear plant, visual, material and discursive spawned a range of reactions that spanned from intrigue to ambivalence to resistance. With an overview of ‘hot spots’ in Kanyakumari and Tirunelveli Districts, the prospect of more radioactivity applies not just to the Kudankulam Nuclear Power Plant but also to high levels of background radiation in peninsular India, and the mining of sand for atomic minerals particularly for alternative sources of nuclear fuel by way of thorium. Along the way, we assess the repercussions of new hierarchies with the migrant middle class of nuclear employees and the entrenchment of old ones along caste-communal lines.

scholarly journals NEED OF A NEXT GENERATION SEVERE ACCIDENT CODE

2019 ◽  
Vol 21 (3) ◽  
pp. 119
Author(s):  
Alexandre Ezzidi Nakata ◽  
Masanori Naitoh ◽  
Chris Allison
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Severe Accident ◽  
Benchmark Problems ◽  
Joint Research ◽  
Pressurized Water ◽  
Water Reactors ◽  
Reactor Types ◽  
New Generation

Two international severe accident benchmark problems have been performed recently by using several existing parametric severe accident codes: The Benchmark Study of the Accident at the Fukushima Daiichi Nuclear Power Plant (BSAF) and the Benchmark of the In-Vessel Melt Retention (IVMR) Analysis of a VVER-1000 Nuclear Power Plant (NPP). The BSAF project was organized by the Nuclear Power Engineering Center (NUPEC) of the Institute of Applied Energy (IAE) in Japan for the three Boiling Water Reactors (BWRs) of the Fukushima NPP. The IVMR Project was organized by the Joint Research Center (JRC) of the European Commission (EC) in Holland (Europe) for a Pressurized Water Reactor (PWR). The obtained results of both projects have shown very large discrepancies between the used severe accident codes for both reactor types BWR and PWR. Consequently, the results for a real plant analysis by these integral codes, may not be correct after the beginning of core melt. Discrepancies of results of ex-vessel phenomena in the containment between the codes are in general larger. Therefore, there is a strong need for a reliable new generation mechanistic severe accident code which can simulate severe accident scenarios from an initiating event till containment failure with better accuracy not only for existing light water reactors but also for new generation IV reactor types. SAMPSON mechanistic ex-vessel modules coupled with SCDAPSIM and a new thermal-hydraulic module ASYST-ISA with particularly newly developed options for the reactor coolant system (RCS) and material properties applicable to new reactor deigns, is proposed as a best etimate new generation severe accident code for several reasons which are described in this paper.Keywords: Severe accident, SAMPSON, SCDAPSIM, ASYST-ISA, Steam explosion, Hydrogen detonation

scholarly journals Calculation of the Dose for Public Individuals Due to a Severe Accident at the Angra 2 Nuclear Plant, Brazil

2021 ◽  
Author(s):  
André Silva de Aguiar ◽  
Seung Min Lee ◽  
Gaianê Sabundjian
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Nuclear Plant ◽  
Emergency Planning ◽  
Severe Accident ◽  
Whole Body ◽  
The Public ◽  
Protective Actions ◽  
Radionuclide Release

Through a severe accident at nuclear power plant Angra 2, the whole body dose effective of the individuals members of the public located in the Emergency Planning Zones (EPZs) will be calculated, and later, the protective actions in these EPZs will be analyzed. Two different scenarios of radionuclide release into the atmosphere will be considered. In the first scenario, 2 h of the release of Xe, Cs, Ba, and Te, and the second scenario, 168 h of release.

Fragility of a Flood Defense Structure Subjected to Multi-Hazard Scenario

2016 ◽  
Author(s):  
Saran Srikanth Bodda ◽  
Harleen Kaur Sandhu ◽  
Abhinav Gupta
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Hurricane Sandy ◽  
Nuclear Plant ◽  
Gravity Dam ◽  
Concrete Gravity Dam ◽  
Element Analysis ◽  
Dam Foundation ◽  
Flood Defense

The March 2011 Fukushima Daiichi nuclear power plant disaster has highlighted the significance of maintaining the integrity of flood protection systems in the vicinity of a nuclear power plant. In the US, Oyster Creek nuclear plant was shut down when high storm surge during hurricane Sandy threatened its water intake and circulation systems. A gravity dam located upstream of a power plant can undergo seismic failure or flooding failure leading to flooding at the nuclear plant. In this paper, we present the results from a study on evaluating the fragilities for failure of a concrete gravity dam under both the flooding and the seismic events. Finite element analysis is used for modeling the seismic behavior as well as the seepage through foundation. A time-dependent analysis is considered to account for appropriate nonlinearities. Failure of dam foundation is characterized by rupture, and the failure of dam body is characterized by excessive deformation for the flooding and seismic loads respectively. The study presented in this paper has focused on a concrete gravity dam because of the need of validation of models which exist in prior studies only for concrete gravity dams. However, the concepts are directly applicable to any concrete flood defense structure.

scholarly journals Nuclear decommissioning in Brazil and China: regulatory development, incompleteness and future synergy

2018 ◽  
Vol 11 (3) ◽  
pp. 220-236 ◽  
Author(s):  
Maria-Augusta Paim ◽  
Chung-Han Yang
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Expert Advice ◽  
Energy Agency ◽  
Safety Standards ◽  
Technology Sector ◽  
Nuclear Decommissioning ◽  
Substantial Progress ◽  
The Uk

Abstract The law and regulation of nuclear infrastructure decommissioning is developing worldwide. At the international level, safety standards for the decommissioning process were established under the auspices of the International Atomic Energy Agency, which also encourages international co-operation and gives expert advice for Member States’ projects. Advanced jurisdictions such as the UK, US and Japan have made substantial progress in the elaboration of national legislation covering issues related to the risks for safety and the environment. This article aims at assessing the Brazilian and Chinese efforts, achievements and challenges in the establishment of national decommissioning legal regimes using the analytical lenses developed by probing into the strengths exhibited by selected advanced jurisdictions’ decommissioning regulations and experiences, in namely the UK, USA and Japan. As a result, the structural perspective developed enables the assessment of the effectiveness of the decommissioning framework of jurisdictions at an earlier stage. Brazil and China have just started to build their national decommissioning nuclear power plant regimes. Besides sharing a common nuclear power plant decommissioning regulatory momentum, both countries’ asymmetric capacities in the technology sector can be reciprocally combined to create a mutually beneficial relationship.

Nuclear Plant Modification in a Risk-Informed Environment

2002 ◽  
Author(s):  
Raymond H. V. Gallucci
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Cost Benefit ◽  
Nuclear Plant ◽  
Regulatory Environment ◽  
Benefit Evaluation

This paper examines a specific nuclear power plant modification performed in a risk-informed regulatory environment. It quantifies both the permanent and temporary effects of the modification, and performs a cost-benefit evaluation.

Sign in / Sign up

Export Citation Format

Share Document