1. no: 1 CEMSIS wp6_beg022_v0_4_intro slides.ppt CEMSIS FIKS-CT-2000-00109 Cost-Effective Modernisation of Systems Important to Safety Deryk Pavey, Deryk Pavey,

2. no: 2 CEMSIS wp6_beg022_v0_4_intro slides.ppt CEMSIS Objectives u Programmable Instrumentation and Control (I&C) l safety systems (e.g. protection) l safety-related systems (e.g. control, data presentation) u Common approach to development and safety justification l maximise safety l minimise cost u Modernisation/Refurbishment l analogue/discrete logic replacement with computer-based systems

3. no: 3 CEMSIS wp6_beg022_v0_4_intro slides.ppt ‘Stakeholders’ in CEMSIS u Nuclear Plant Operator l British Energy (co-ord.)UKelectricity generation l Electricite de FranceFelectricity generation l British Nuclear FuelsUKnuclear fuel processing u Suppliers & System Integrators l Framatome ANPDEI&C supplier l Sycon InternationalSEsystem developer u Safety Authorities & Assessors l AV NuclearBinspection and licensing l AdelardUKsafety consultancy l SKI (Sycon subcontract)SEinspection and licensing u IT Research l TU LundSEresearch & education

4. no: 4 CEMSIS wp6_beg022_v0_4_intro slides.ppt Key Issues u Harmonisation & Structuring of Safety Justification approaches u Definition of Requirements for Systems Important to Safety u Use of Pre-Existing Software in Systems Important to Safety l potentially including class A systems u Use of Languages and Tools in Systems Important to Safety

5. no: 5 CEMSIS wp6_beg022_v0_4_intro slides.ppt CEMSIS Modernisation Context Utility Supplier Regulator Project viability User requirements process Requirements document SIS requirements specification Tendering process Test and Verification SW Development SIS Implementation Decomposition & Design Final Licensing / Approval Normal operation and maintenance Acceptance & Phased Introduction Validation Installation & Site Commissioning Negotiation & Acceptance Pre-qualification (independent assessor) Amended SIS requirements Safety Justification Plan 4 4 4 4 4 4 4 4 Key: = Work Package Number Discuss/ Agree 3 3 Safety Justification 1 1 Regular communication and informed comment 2 2 2 2

6. no: 6 CEMSIS wp6_beg022_v0_4_intro slides.ppt Work Package Tasks Safety Justification Survey and Framework Safety Justification Framework WP1 Requirements Capture Survey and Lifecycle Requirements Capture Guidelines WP2 Pre-Existing S/W Strategy & Techniques Pre-Existing S/W Guidelines WP3 Languages & Tools Review and Evaluate Languages & Tools Report WP4 WP0,6 Management and Dissemination Case Studies: UK: fuel reprocessing F: PWR I&C replacement SE: safety monitoring + Public Domain Example WP5