David Fiddler has over 30 years of experience in the nuclear power industry, primarily providing reliability-centered maintenance (RCM), root cause failure analysis, and safety case support to nuclear power plants. He has worked extensively with EDF Energy and plants in Central/Eastern Europe. Fiddler has managed teams of engineers/scientists and authored over 60 engineering changes. He is an experienced trainer and has designed/delivered training in areas like RCM, safety cases, and equipment reliability.

1. Page 1 of 7 DAVID FIDDLER
DAVID FIDDLER
EDUCATION:
Open University – BA (Hons) Literature
No 1 School of Technical Training Royal Air Force Cosford
South Cheshire College – C&G Certificate in Teaching in the Lifelong Learning Sector (Level 4)
KEY EXPERIENCE:
• Reliability-centred Maintenance
• EDF Energy:
o Engineering Change (AV1)
o HAZOP Chairperson
o Root Cause Failure Analysis
o Reliability Reviews
o Optioneering
o Safety System Reviews
• PWR (VVER) Operations
• PWR (VVER) Maintenance
• Plant Walkdown
• Training
o Accredited EDF Energy Trainer in INPO AP913 Equipment Reliability Process
o RCM
o PM Reviews
o HAZID/HAZOP
o Risk Reduction & ALARP
o Incident Investigation/RCA
o Reliability, Availability & Maintainability (RAM)
o Accredited Liverpool John Moore’s University Teacher (via Risktec’s MSC/PG Dip
programme)
PROFESSIONAL EXPERIENCE:

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Seventeen years experience as a Principal Consultant/Section Manager in the nuclear power
generation industry, providing a range of operational and technical services on a variety of reactor
types/systems and conventional plant. Primary role is the provision of Safety Cases for EDF Energy’s
Advanced Gas-Cooled Reactor fleet and VVER reactor types in Central & Eastern Europe. Registered
as EDF Energy SCM AV1.
Managed a multi-disciplined team of fifteen engineers/scientists primarily providing Reliability-Centred
maintenance (RCM), Root Cause Failure Analysis (RCFA) and other technical services to several
Eastern European Nuclear Power Plants via the EuropeAid TACIS/INSC programmes, European
Bank for Reconstruction & Development (EBRD) projects and directly funded projects.
Prior to the above I completed twenty-three years service as an aircraft-engineering technician with the
Royal Air Force becoming skilled in all aspects of aircraft/aircraft systems maintenance and repair. An
experienced Trainer and Training Designer with a background in leadership, management, inter-personal
skills and attitudinal goals setting. More recently in preventive maintenance concepts, and in particular,
Reliability-centred Maintenance.
2010 to present - Principal Consultant, Risktec Solutions Ltd
Support to EDF Energy’s Stations and Central Technical Organisation (CTO), providing technical and
management support to the AGR plant life extension (PLEX) programme. Recent projects include:
• Torness diesel Generators Preventive Maintenance optimisation – replacement of the time-
based invasive PM strategy with a Condition Monitoring and Performance Monitoring strategy.
Resulted in a ~65% reduction in maintenance man hours and a 32.5% increase in diesel
generator availability.
• Hinkley Point B/Hunterston B Power Stations – Installation of new auxiliary boiler systems.
Production of Safety Cases and revisions to existing Safety Cases. Control of modification
proposals. Supervision of Prime Contractor safety documentation production.
• Hartlepool/Heysham 1 Power Stations – PLEX programme upgrades to make up water treatment
and condensate polishing plants. Replacement of bypass gas plant facilities within the reactor
pressure boundary. Modifications to improve the steam and hot gas release safety cases.

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The above projects involve referral to EDF Energy Technical Governance and all other EDF Energy
corporate Codes of Practice (COPs), Integrated Company Practices (ICPs), specifications (BEG SPECs),
etc.
1998 – 2010 - Principal Engineer/Team Leader, AMEC Nuclear UK
Main duties include the supervision of a multi-disciplined team of engineers and scientists offering a
range of technical/scientific and Safety Case services primarily to EDF Energy and Central & Eastern
European nuclear utilities. Author and presenter of EDF Energy Safety Case training for reactor
systems and balance of plant engineers. Provision of advice on generic preventive maintenance
issues and, in particular, reliability analysis and operational/availability limits. Production of Safety
Cases for Regulatory approval and maintenance optimisation reviews via the medium of Reliability-
Centred Maintenance and INPO AP913. Design and delivery of RCM training of EDF Energy power
station and CTO engineers.
RCM Facilitator
Maintenance optimisation tasks have included:
• Torness Diesel Generators
• Torness Main Boiler Feedpumps
• Torness Start/Standby Boiler Feedpumps
• Torness, Heysham 2 and Hinkley Point B Oxygen Injection Systems;
• Hunterston B Feed and Condensate System;
• Heysham 2 Fuelling Machine;
• Heysham 2 Diesel Generators;
• Bohunice NPP (Slovakia) Emergency Diesel Generators;
• Mochovce NPP (Slovakia) Primary Circuit, Make-up & Boric Acid Regulation, HPSI, LPSI, etc;
• Heysham 2 Gas Circulator Lubricating Oil System;
• Rovno NPP (Ukraine) HPSI, LPSI, Primary Circuit, etc;
• Dukovany NPP (Czech Republic) Main Coolant Pumps.
Engineering Change Author
Approximately 60 ECs including Cat 1 Papers of Principle and Cat 2 Papers of intent. Examples
are:
• Torness diesel Generators – Safety Case for Implementation of the Results of the RCM
Optimisation;
• Torness and Heysham 2 Oxygen Injection Systems;

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• Hartlepool/Heysham 1 Dimethylamine Dosing;
• Hartlepool/Heysham 1 Hybrid Electronic/Analogue Temperature Sensing (HEATS);
• Hartlepool/Heysham 1 PLEX ECs;
• Heysham 1 Switchgear PM Optimisation;
• Heysham 1 G800 Valve Replacement;
• Torness, Hunterston B and Heysham 2 Emergency Diesel Generator Systems Test Run
Frequencies;
• Hunterston B Cast Iron Reactor Seawater System Pipework replacement programme;
• Hunterston B & Hinkley Point B Auxiliary Boilers and Steam Pipework Replacement Project;
• Mochovce NPP Primary Circuit Maintenance Optimisation Safety Case;
• Rovno NPP Maintenance Improvement Project (INSC).
Safety System Reviews
Safety System Review (SSRs) are performed on a three-yearly rolling programme to ascertain
whether or not system performance continues to underwrite the safety case claims and
arguments. Author of a number of SSRs at several EDF Energy power Stations, including:
• Diesel Generators
• Emergency Boiler Feed Systems
• Decay Heat Feed Systems
• Essential Electrical Supplies
• Data Processing Systems
• Reactor Internals
• Auxiliary Steam Supplies
• Fuel Route
• Turbine Overspeed Protection
• Primary Coolant (CO2) Storage and Distribution
RCFA Specialist
RCFA studies during this period included:
• Dungeness B Boiler Feed Control System;
• British Petroleum Foinaven Oil Field Formation Isolation Valve failure;
• British Petroleum Loyal Oil Field SB-3H Packer Primary Actuation failure;
• Heysham 2 Gas Circulator Lubricating Oil System;
• AMEC/Morgan Est Valiant Jetty Project

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Plant Walkdown Specialist
Assessor and author of the Torness Power Station Diesel Generator System ‘Zonal Inspection Plan’.
Optioneering Assessor/Author
Author of several Optioneering Reports for major system replacement/refurbishment initiatives,
including:
• Dungeness B Main Boiler Feed Control System;
• Torness Condenser Level control System;
• Torness Make-up Water Treatment Plant;
• Heysham 2 Electro-chlorination Plant.
Safety Case Training Design and Delivery
Designed and delivered Torness Power Station Safety case training modules for plant personnel:
• Generic Station Safety Case;
• Reactor Systems;
• Fuel Route;
• Electrical, Control & Instrumentation;
• Balance of Plant.
INPO AP913 Foundation in Equipment Reliability (FIER) training
Designed and delivered FIER training at EDF Energy Barnwood as part of BE’s roll out of AP913
Equipment Reliability Process (ERP);
• Generic ERP fundamentals
• RCM/SRCM©
• Condition Monitoring Techniques
• Plant Walkdown
• System Health Process
• System Health and the Safety Case
All of the above projects also included the production/revision of appropriately categorised Safety
Case submissions and other supporting documentation.
Author of a significant number of British Energy AGR-related Safety System Reviews, Category 1
and 2 Engineering Changes, Engineering Advice Notes and other technical reports

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1995 – 1998 - Headquarters Logistics Command, RAF Wyton, Aerospace Maintenance
Development and Support (AMDS)
Responsible for the design, development and delivery of all training courses pertaining to preventive
maintenance, a core activity of AMDS. Also responsible for the complete revision of the preventive
maintenance programmes of Several Royal Air Force aircraft using Reliability-Centred Maintenance.
During this period, the Royal Air Force Logistics Support Services achieved Government Agency
status which allowed me to successfully market RCM training courses to both British and foreign
industry
1994-1995 - RAF Cosford, Training Course Design Duties – No 1 School Technical
Training,
Complete redesign of the RAF Avionics Technician Course, both practical and academic elements,
utilising the Israeli Aircraft Industries Ltd Integrated Job Performance Training (IJPT) methodology.
1991-1994 - Instructor at the Airmen’s Command School
Instructing leadership, management, communication and inter-personal skills, in both practical and
theoretical teaching environments. Responsible for assessing and reporting on candidates’ suitability
for promotion to NCO status.
1987 – 1991 – 92 Squadron Flight Line Controller, Germany
Employed on a busy fast jet squadron, responsible for the day-to-day management of the squadron’s
aircraft. Also in charge of the allocation and supervision of tasks detailed to the technicians of my
particular discipline
PUBLICATIONS:
How can reduced maintenance improve nuclear safety? – Presented at WANO Paris Centre 2004
(representing British Energy Generation Ltd)
The Application of Reliability-Centred Maintenance at Slovenské Elektrárne’s Mochovce NPP –
presented at Bulatom Varna Conference 2006
Trip Hardening’ of High Value Fixed Assets – Innovative Solutions to Unplanned Losses –
presented at the 32
nd
ESReDA Seminar 2007

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Some Considerations Associated with the Management of Contractors Engaged for Nuclear Safety-
related Maintenance Work - presented at the European Commission Joint Research Centre, Petten,
Netherlands, 2009