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Dennis Allen PhD, BSc, C Phys, M Inst P Physics Team Leader

Core Skills Materials Dosimetry, Radioactive Materials Transportation, Shielding, Criticality, Reactor Physics, Intelligent Customer.

Professional Summary

I have over fifteen years’ experience in the nuclear industry following over eleven years in academia. I have a broad understanding of many of the safety issues connected with the operation and decommissioning of nuclear plant, especially in the fields of reactor physics, materials dosimetry, shielding, criticality and radioactive materials storage and transportation. I have successfully trained, developed and led a team of practitioners with particular expertise in materials dosimetry and radiation shielding and made significant contributions to many diverse projects within my time in the industry, a brief selection of which is described below. I have significant experience of successful inter-team collaboration both within and beyond my current employer.

Professional Appointments External Examiner for the University of Birmingham MSc Course The Physics and Technology of Nuclear Reactors Member of the Editorial Board for Progress in Nuclear Energy Member of the Chartership Panel for the Institute of Physics

Professional Membership Member of the Institute of Physics and a Chartered Physicist since 1992

Education PhD in Condensed Matter Physics, University of Leicester, 1990 BSc Physics (2i), University of Leicester, 1985

Employment History AMEC & Serco, Physicist, Berkeley and Gloucester, 2006 - present Magnox Electric, Oldbury Power Station, Reactor Physics (secondment), 2002 - 2003 Magnox Electric, Berkeley Centre, Nuclear Safety Analyst, 2000 - 2005 University of Birmingham, Applied Radiation Physics, Research Fellow, 1992 - 2000 University of Leicester, Condensed Matter Physics, Research Associate, 1989 - 1992

Representative Projects

Nuclear Fuel Transportation

DFR Breeder Fuel Transport Safety Case, Magnox, UK, 2011 - 2012 I was Technical Integrator and played a key role for Magnox in developing the safety case for the transport of redundant breeder fuel from Dounreay to Sellafield using the Magnox M2 flask. This was a complex and high profile project involving several sites and scientific disciplines. Successful delivery to time and quality has enabled significant and timely progress towards decommissioning the country’s first fast reactor power plant.

Nuclear Fuel Transport Safety Cases, Magnox, UK, 2001 - 2015 I have revised several safety cases for the transport of spent Magnox fuel, ensuring that the requirements for enhanced and diverse loads were met, whilst maintaining compliance with the complex requirements of transport regulations. These safety cases have been of considerable benefit to Magnox in its goal of achieving the Magnox Operating Plan and the significance of this work was recognised early when I received a George Westinghouse Signature Award in 2002. I have also assessed the fissile material content of various waste streams to ensure demonstrable compliance with “fissile excepted” transport requirements and as inputs to criticality assessments.

Radiation Shielding

Intelligent Customer, Magnox, UK, 2012 to present I act as an Intelligent Customer within the waste management function at Oldbury Technical Centre.

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I specify and review shielding assessments and undertake INSA for a wide range of projects delivering waste management solutions, ensuring that safety case and project requirements are met and that standards are maintained. I am also assisting with the Intelligent Customer role for criticality work.

Emergency Arrangements

Fuel Route Accident Management Guidelines, Magnox and EDF Energy, UK, 2012 - 2014 I was a key participant in drafting the Fuel Route Accident Management Guidelines for three Magnox sites in response to the Fukushima Daiichi accident. For EDF Energy I acted as reviewer for their fuel route Symptom-Based Emergency Response Guidelines.

Central Emergency Support Centre, Magnox, UK, 2004 - 2015 I am a trained and experienced member of the Magnox CESC. Within this role I support the emergency response team as Assistant Health Physicist. Rapid assessment of limited radiological information is required, as is atmospheric dispersion modelling, the prediction of avertible doses to the public and the subsequent formulation of advice to support off-site emergency response arrangements.

Materials Dosimetry

Core Restraint Dosimetry for AGR Side Reflectors, British/EDF Energy, UK, 2007 to present I was Technical Lead for this safety-critical programme of work for several Advanced Gas-Cooled Reactors. The initial assessment prevented the threatened shutdown of the Hinkley Point B and Hunterston B reactors, following an unfavourable review of earlier recommended neutron damage rates. Throughout this programme of work I was the key player in the assessment of material damage and nuclear heating and the recent highly successful validation of the MCBEND modelling against neutron flux stringer activation measurements.

Graphite Dosimetry, EDF Energy, UK, 2013 to present I was Technical Lead for the development and implementation of a novel and efficient method of providing updated dosimetry data for all the Advanced Gas-Cooled Reactor cores. The work has developed, validated and delivered a highly flexible methodology for the provision of nuclear heating and neutron damage assessments anywhere within the graphite cores of the AGR fleet. This will result in improved confidence in the provision of graphite core materials property assessments as the fleet ages and will support the safety cases for continued operation.

Neutron Dosimetry Assessment for Sizewell B Cycle 9, British Energy, UK, 2008 - 2010 I was the Project Manager and Lead Verifier for the surveillance capsule, Reactor Pressure Vessel and Core Barrel dosimetry assessment. This work is vital for underpinning the safety case for continued operation. I was subsequently asked to review the suitability of the proposed damage parameter for the planned EDF Energy EPR stations.

Steel and Graphite Dosimetry Support, Magnox, UK, 2000 - 2009 I was a key player in the provision of Magnox graphite dosimetry data for weight loss and damage assessments. These played a vital part in the safety cases for continued operation of Magnox reactors, especially towards the end of their operating lives. I was also a key player in the provision of materials dosimetry support for the pressure circuit of the Magnox reactors, including the Reactor Pressure Vessels.

Reactor Physics

Reactor Physics Station Experience, Oldbury Power Station, UK, 2002-2003 I was seconded to Oldbury Power Station as Assistant Station Physicist where I was in charge of a team responsible for nuclear safety. This period included a statutory outage and its associated return to service and provided valuable experience in the operation of a generating nuclear plant.

Oldbury End-of-Generation Fuel Savings Project, Magnox, UK, 2003-2005 I managed a project to achieve significant fuel savings at Oldbury Power Station as it came towards the end of its generating life. I led a team to select the best fuel saving options and deliver the safety case for implementing the best strategy, taking into account the sometimes conflicting requirements of the various stakeholders. This project was an essential part of the Magnox Operating Plan and ultimately resulted in significant financial benefit.

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Training Course Production and Delivery

Materials for Fusion and Fission Power, UK, 2011 I delivered part of the material for this Easter Residential Course at the University of Oxford

Radiation Shielding Course, EDF Energy, UK, 2009 I produced and delivered a training course in radiation shielding and neutron activation assessment methods. This was a collaborative project with other Technical Support Alliance partners.

MCNP Training Courses, UK and South Africa, 1998 - 2000 I developed and delivered bespoke training courses in the use of the Monte Carlo code MCNP for postgraduate students at the University of Birmingham and for medical physicists and nuclear scientists in South Africa.

University Projects

Boron Neutron Capture Therapy (BNCT) Facility, University of Birmingham, 1992 - 2000 I designed the neutronics system for an accelerator-based BNCT facility based on a linear proton accelerator. This included complex neutron yield calculations, as well as target, filter and shield design and optimisation studies. The Monte Carlo method MCNP was used for this and for initial conceptual treatment planning studies. I also organised a national conference.

Neutron Radiography, University of Birmingham, 1992 - 1995 Design of a thermal neutron radiography system. This required moderator and shield design and optimisation (using MCNP), as well as validation using neutron activation measurements.

Positron Emission Particle Tracking, University of Birmingham, 1998 - 2000 This novel coincidence detection technique provided insight into various mixing phenomena, including the behaviour of fluidised beds, food mixing and other chemical engineering processes.

3D Gamma-ray Imaging, University of Birmingham, 1998 - 2000 I developed the hardware and software for a 3D gamma-ray imaging technique, primarily for medical diagnostic applications.

Over the years I have published many academic papers and delivered several conference and seminar papers (titles and references available on request).

Selected Training & Conferences 2015 International Conference on Multiphysics – Imperial College 2015 Coaching and Mentoring – two day course 2014 Criticality Intelligent Customer training - Magnox 2014 Advanced Boiling Water Reactor Seminar - Imperial College 2010 11th International Nuclear Graphite Specialists Meeting, INGSM-11 – Eastbourne 2008 13th International Symposium on Reactor Dosimetry, Akersloot, Netherlands 2006 Introduction to MONK 2006 Radioactive Material Transport- one day RAMTUC course 2005 onwards Magnox CESC training and regular exercises (nuclear emergency response) 2005 Assertiveness – two day course 2004 5th International Nuclear Graphite Specialists Meeting, INGSM-5 – N Wales 2004 Introduction to Fault Studies – assessed two day course 2004 Providing Quality Service – two day course 2002 PANTHER – assessed five day course 2002 Control and Supervision – assessed one day course 2002 Safety Case Authorship (AVA) – complex safety cases 2001 Safety Case Authorship (AVB) – simple safety cases 2001 Magnox Overview – assessed five day course on Magnox plant 2001 Introduction to Nuclear Plant Theory – assessed five day course 2000 onwards Attendance at the annual ANSWERS Seminar (most years) 2000 Project Management (APM) – assessed five day course 1999 Interpersonal Skills (University of Birmingham) 1998 MS Excel (University of Birmingham) – two day course 1997 Supervising Research Students (University of Birmingham) 1997 MCNP Advanced (Imperial College) – five day course