Introduction to Remote Maintenance - Nucleus...The maintenance challenge 3 Oliver Crofts –5th IAEA DEMO Programme Workshop –Daejeon, Korea –7th to 10th May 2018 Remote maintenance

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UKAEA - RACE

Introduction to Remote Maintenance

Oliver Crofts

5th IAEA DEMO Programme Workshop

Daejeon, Korea – 7th to 10th May 2018

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UKAEAUK fusion research and development

RACE and CCFE are both

parts of UKAEA

RACE conducts all the remote

handling research and development

within UKAEA, including control

system development and working

with autonomous vehicle developers

RACE – Remote applications in

challenging environments

Oliver Crofts – 5th IAEA DEMO Programme Workshop – Daejeon, Korea – 7th to 10th May 20182

Autonomous vehicle

outside RACE

MAST

tokamak

JET tokamak remote maintenance system

Mascot manipulator operating in JET

Remote vehicle

testing at

RACE

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The maintenance challenge


Remote maintenance risks, gaps and development needs

The maintenance system is critical for the success of a fusion

power plant:

Must operate rapidly

Requires novel technologies

Will be large and complex

5 maintenance sub-topics address these challenges

| Oliver Crofts – 5th IAEA DEMO Programme Workshop – Daejeon, Korea – 7th to 10th May 20184

ITER NB Cell layout development

Increasing Complexity

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Maintenance is design driving


Step change in the availability requirements

compared to experimental devices

Demonstrate power plant feasibility

Short maintenance durations

Balance maintenance cost with availability and performance

Makes the maintenance system a design driving activity

Maintenance requirements will drive some aspects of the

plant design

Early integration of maintenance into the plant design

Developing maintenance oriented strategies

Understand maintenance space constraints

Develop enabling technologies

Minimise the cost of the supporting facilities

Develop standard tools, interfaces and deployment systems

Understand how safety can affect maintenance

Consider the benefits of advanced control techniques

Maintenance system strategy and design

Plant layout and component design

Fusion development is moving from

experimental devices power plants

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plant design









K DEMO in-vessel component

segmentationKeeman Kim et al,

FPCC Paris, France 2016/1/27



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plant design









EU DEMO vessel inspection

deployment systems by CEA



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plant design









Laser bore pipe cutting and

welding

Laser bore cutting and welding

Pipe alignment and deployment

Thermal compensation

Non-destructive testing



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plant design









ITER hot-cell

Large range of functions

Significant cost driver

Storage

Commissioning

Dismantling

Waste



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plant design









JET standard remote interface

Mechanical interfaces

Pipe connections

Deployment systems

Tools

Design, testing, manufacture, spares

Space for access and tools



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plant design









Dropped loads

Containment and confinement

Inspections

Recovery and rescue

Accident conditions

Seismic events



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plant design









CFETR blanket handling



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Fewer TF coils

Fewer but heavier components to handle

Bigger vertical ports (radially outwards)

Reduced magnet performance (ripple)

More space for stronger, stiffer handling

Direct lifting of some blankets

Smaller number of components

Maintenance access through all ports

Removal of other in-port equipment

Visibility of components through the ports

Handling system deployed in the port

No toroidal pipe sections inside the vessel

Space for inspection

Increased radial build to inspect vessel

Access within the cryostat

Tokamak architecture


Trade-off between practical maintenance and plant designDefined and agreed early

RM Sub-topic 1 – Tokamak architecture

Presented by Eric Villedieu of CEA, France

EU blanket kinematics

JA DEMO and EU DEMO

Straight pipe connections

CFETR blanket handling

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Service joining technology


Service joining is an important part of maintenance and an enabling technology

Plasma facing component fluid connections are design driving

Valuable information and experience is being developed

DEMO will need to push the technology further

Higher demand for rapid maintenance

Harsher environment; radiation tolerance, rescue

Larger pipes with thicker walls

Includes pipe alignment and pipe deployment,thermal compensation, non-destructive testingand meeting the requirements of the regulator

RM Sub-topic 2 – Service joining technology

Presented by Satoshi Kakudate of QST, Japan

Current development status

JA DEMO pipe layout and handling

EU DEMO laser cutting and welding

ITER comparison between laser and TIG, fitting errors, life, mechanical cutting, non-destructive

testing and radiation hard components

Future actions to fill the gaps in the development by exiting fusion devices and industry

Do we have the service joining technology required for DEMO?

In-bore pipe cutting and welding,

close to the blanket

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Maintenance support facility


Large range of tasks lead to large size and high cost

Storage of new components and line replaceable items

Decontamination, storage, maintenance, commissioning and

upgrade of remote handling equipment

Storage and dismantling of used components

Segregation and size reduction of waste

What are the scope, size and cost implications for DEMO?

RM Sub-topic 3 – The role of the hot-cell in achieving fusion power

Presented by Nick Sykes of RACE, UK

Options

Minimise the burden on the facility

Automation, radiation tolerance

Standardisation of plant and operations

ITER

hot-cell

EU DEMO

Maintenance

facility

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The impact of safety on maintenance


Safety implications can have a large impact on the maintenance strategy and some may not be acceptable to a regulator, particular issues are:

Lifting large components significant distances above containment structures

Moving confinement barriers for maintenance

Impact between components during accidents

Investment protection

Serious damage to the plant cannot be tolerated,even where there are no direct safety implications

Regulator involvement

Regulator will not be involved until the design is mature

Anticipate what could be approved

Consider stakeholder requirements

Limit the risk of significant redesign

DEMO designs have similar safety risks

Lessons learned from ITER Divertor Remote Handling System

Regulation, nuclear safety and investment protection

What impact can safety have on technologies and strategies?

RM Sub-topic 4 – The impact of safety on DEMO remote maintenance

Presented by Gary Reed of Assystem, UK

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Intelligent maintenance


DEMO remote maintenance has a unique conjunction of control challenges

Rapid and precise handling of components throughout the complex trajectory

Uncertainty in models and measurements

Degradation of the payload

Limited sensor availability

Heavy and flexible payloads

Safety issues

Automated control

Principally to speed up operations

‘Smart’ to adapt to changing conditions

Limited development in industry

Worldwide development

Understand the benefits

Task optimisation and efficiency

Input into DEMO design

Strategy study on Intelligent Maintenance; motivations, realisation issues, gaps and uncertainties.

Implementation on CFETR, focusing on information management and artificial intelligence

What benefits may be achieved with advanced control techniques?

RM Sub-topic 5 – Intelligent maintenance for fusion reactors

Presented by Yong Cheng of ASIPP, China

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EU DEMO Remote Maintenance work byRACE and CEA is part funded by EUROfusion

Safety impact assessment by Assystem UK

JA DEMO work by QST Rokkasyo Fusion Institute

and Naka Fusion Institute

CFETR work by ASIPP

Contributors


Documents

Introduction to Remote Maintenance - Nucleus...The maintenance challenge 3 Oliver Crofts –5th IAEA DEMO Programme Workshop –Daejeon, Korea –7th to 10th May 2018 Remote maintenance