3D radiation characterisation

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Since its creation in June 2010, Createc Ltd has provided technology development and R&D consultancy, serving various industries including the civil nuclear, transport, defence and security sectors. With an expert team of creative problem solvers, one of Createc’s successes is their unique imaging and sensing technology. These applied innovators have a mission to help people and machines understand the world around them. As such, the N-Visage® suite of imaging technologies puts forward an impressive line-up covering all aspects of 3D radiation mapping.

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Is this your challenge?

radiation challenge

From maintenance to decommissioning strategy, activities on nuclear sites are regularly constrained by radiation fields, often due to complex source term conditions. Typically, radiation protection technicians are performing manual surveys of the conditions, and then producing (often hand sketch) dose & contamination survey maps. The traditional survey methods do not allow the communication of the complexity of both the plant geometry and the radiological conditions, thus limiting the use of this data to inform operations.

Createc’s N-Visage® gamma imagers (Scanner and the handheld version, Recon) are capable of mapping gamma readings onto images and videos, as well as combining 3D point cloud data with gamma readings to localise sources. Their flagship instrument for radiation characterisation, the N- Visage® Scanner, has been refined by Createc over the last ten years and is the only solution that uses 3D Lidar positioning, gamma detection and optical imaging to deliver a full 3D model of radiation and contamination sources.

Note 1: 100 Rem/h is equivalent to 1 Sv/h

User case

Exelon – LaSalle NPP – Reactor Valve Cleanup (Capture & Mapping) – Marseilles (USA)

  • Reactor Water Cleanup valve needed to be breached and have the internals replaced during a refuel outage. It is located in a locked high rad area.
  • Shielding options also needed to be evaluated to reduce worker exposure during a project to replace those internals.
  • The N-Visage laser scan 3D point cloud, panoramic camera image, and CZT spectroscopy were combined to create a virtual environment that quantified and located the dose contribution from all sources.
  • Only four scan positions were necessary to cover the whole area.
Survey locationSurvey dataN-Visage data% Error
A1,300 mR/h1,304 mR/h0.3%
B600 mR/h635 mR/h5.8%

LaSalle NPP
LaSalle NVisage

Exelon – LaSalle NPP – Reactor Valve Cleanup (Analysis & Modeling) – Marseilles (USA)

  • Analysis/modelling with Createc’s N-Visage® Fusion software.
  • Search for an optimised shielding package to reduced dose rates in the area while minimizing cost and complexity.
  • Analysis compares the traditional “Hot spot” shielding LaSalle would have used (A) with other various shielding configurations (B-C-D).
  • LaSalle saved 12 Rem over the course of all the work done on this valve (D): a 50% dose reduction overall. All in all, the scans took 30 mRem, shielding was installed in 20 minutes with 163 mRem.

Survey locationNo shieldA


“Hot spot” shielding
BCD Optimised shielding
1769 mR/h756 mR/h522 mR/h477 mR/h422 mR/h
2918 mR/h901 mR/h531 mR/h378 mR/h824 mR/h
31,283 mR/h1,242 mR/h740 mR/h534 mR/h414 mR/h
4290 mR/h286 mR/h89 mR/h192 mR/h169 mR/h

The technology

The N-Visage® Gamma Imager is the world’s most capable and versatile radiation scanning system for the nuclear industry. Designed by nuclear engineers for nuclear engineers, this is the first characterisation system specifically for challenging deployments through small apertures and in high dose areas.

The system utilises a unique imaging system based on CZT detector technology. This enables a light system, deployable through small apertures with extremely high background rejection, high spatial resolution, high energy resolution, and 360° viewing.

BENEFITS

• Characterise reprocessing and fuel handling facilities using existing service ports, • Post-event characterisation and response,
• ROV deployed characterisation tasks,
• Understand and control the sources of dose in high-dose manual tasks,

• Remote waste assessments.

FEATURES

• Full 360° by 360° gamma image,
• Gamma images in under 3 hours,
• User controllable speed and resolution,
• No software required to review, analyse, share, • Energy resolution: 3% FWHM @ 662 keV,
• Energy range: 30 keV to 2 MeV,
• Integrated spherical camera and 3D laser,
• Spherical image resolution: 12 Megapixel,
• Point cloud range 10m, res. +/- 30mm,
• High dose tolerant: up to 1 Sv/hr (100 Rem/hr), • Fits through small apertures: 110mm OD,
• Weight: 10 – 15 kg (configurable),
• Umbilical length of up to 125m,
• Diameter 85mm; Height 583mm.

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nvisage nuclear innovation
nvisage nuclear innovation

Any questions? Do you want to see more than Createc’s 3D radiation characterisation device? Do not hesitate to contact us directly, we will help you find a fit-for-purpose, cost-efficient solution to your challenge.

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Unit 4, Derwent Mills Commercial Park,

Cockermouth, CA13 0HT United Kingdom

+44 (0) 1900 828112

neil.owen@createc.co.uk

chttp://www.createc.co.uk

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