Activities in C&I in Nuclear Field General Overview

1. Activities in C&I in Nuclear Field General Overview 22nd Meeting of the IAEA Technical Working Group on Nuclear Power Plant Control and Instrumentation, Vienna on May 20-22, 2009. S ROKITA NATIONAL NUCLEAR REGULATOR

2. Contents • Introduction • Licensing Activities • New NPPs - future development • MDEP

3. Introduction Licensing activities in the nuclear industry in South Africa concentrates on the following programs: • Koeberg Nuclear Power Station • Nuclear Energy Corporation (NECSA) • Pebble Bed Modular Reactor (PBMR) • Licensing of new Nuclear Power Plant

4. Koeberg Nuclear Power Station • Projects completed to date: • Simulator upgrade • Changes to Reactor Protection System and system testers • Fuel handling system upgrade • Upgrade of instrumentation of the Spent Fuel Pool following installation of high density racks.

5. Koeberg Nuclear Power Station • Projects completed to date: • Digital Turbine Protection and Turbine Control System • Digital AVR system • RGL (Control rods) system upgrade • RodPilot section; • Control Logic section; • Processing Logic section; • Control Room interface

6. Koeberg Nuclear Power Station • Projects currently under way • CP-1 alignment modifications – further modification/safety improvements currently in different stages of implementation (as a result of periodic safety reassessment). • RCP overpressure protection • Station Blackout modifications (SBO and CCF of LHx- essential boards) • Emergency RCP Seal Supply (ESS) • New Power supply for ESS (DGs) • New Power supply for Train A & B DC systems (DGs)

7. Koeberg Nuclear Power Station • New projects • New Simulator • Relocation of ACACIA Power Station (upgrade of auto start system) • New Fuel Transfer system

8. Koeberg Nuclear Power Station Control Room HMI KPR Panel HMI Historian Level 3 Processing ECC HMI Relaying KRG HV Control Room Discrete Acquisition Analogue Acquisition Interface Interface Interface Interface Interface Interface Interface Interface Interface GSE / GRE Vibration Monitoring RGL Rod Control AVR HV Network Flux Mapping Sub-cooling Monitor EDS LAN Application Acacia Auto Start Interface JDT Fire Detection Interface KKO Event Recorder LHj D/G Monitoring Drain Down KRG SHY H2 Plant KRT Rad. Monitoring

9. Koeberg Nuclear Power Station

10. NECSA • Upgrade of Reactor Protection System of Safari- 1 research reactor further delayed • PBMR Fuel Manufacturing – pilot plant. The First fuel kernels manufactured and currently undergoing testing • PBMR Research facility for fuel irradiation and testing – under development

11. PBMR • PBMR overall licensing process • In term of the complexity of the PBMR Project a multi stage licensing approach has been adopted for licensing the PBMR Reactor • Each stage of the licensing process to be supported by a safety case submitted by the applicant to NNR • First stage is for the approval ( or otherwise) of the site preparation and construction phase • Licensing schedule has been updated by Eskom – original first stage (construction) was expected towards first quarter of 2007

12. PBMR • CURRENT STATUS OF LICENSING ACTIVITIES • The development of initial design of single loop helium cooled 400MWth plant has been put “on hold”. • All efforts now to complete all outstanding licensing issues • The NNR received a proposal for licensing of new design of 2 and 3 loops helium/steam cooled reactor. • Discussion taking place on licensing approach for new design (design certification process).

13. MDEP Initiative • MDEP – Multinational Design Evaluation Programme • Initiative of US NRC • Stage 2 – Establish referenced regulatory practices and regulations to enhance safety of new designs • - existing design specific working groups (AP-1000, EPR). • - The NNR proposed new High temperature Gas Cooled Reactors working group - Issue specific working group – Digital Instrumentation & Control • Stage 3 – implementation of outcome of stage 2 in review of generation IV designs

14. New NPP • Future development • In 2006 South African Government announced plans for second Nuclear Power Station. • Nuclear Power Plant with capacity of 3 000 MW will be built in the southern part of the country by Eskom. • 2 x EPR 1600 or 3 x AP-1000 units have been considered – tendering process was completed and outcome presented to Eskom Board. • Due to bad political climate and development on international financial market Eskom Board decided to shelf current project.

15. New NPP • Future development • Nuclear Sitting Project currently under way in preparation for future nuclear programme expansion • NNR is involved with licensing of 3 nuclear sites. • South African Government set-up a committee to evaluate different reactor designs

16. Perseus Beta Key Aries 400kV substation Kronos Aggeneis Hydro-Electric station Van der Kloof Helios Pumped storage scheme Hydra Gariep Gas turbine station Juno Nuclear station Droerivier 400kV line Poseidon 765kV line Aurora Muldersvlei Koeberg Grassridge Bacchus Proteus Acacia Philippi Acacia Palmiet New NPP =

17. Recommendations to the IAEA on future activities • Cooperation/information exchange with MDEP WG. • (outcome of comparison of IEC/IEEE standards, countries common position on software common cause failure, software tools, software V&V). Not all TWG members have an access to MDEP library • Quantification of Software Reliability • Licensing, qualification requirements, acceptance criteria of COTS systems used in important to safety but not safety related systems • Classification of I&C systems/components for new designs