Upgrading the Reactor Power Control Concept with a Modern Digital Control System

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1 Upgrading the Reactor Power Control Concept with a Modern Digital Control System Entsorgung und Stilllegung M. Längle, R. Schildheuer TÜV SÜD Energietechnik GmbH Baden-Württemberg Mannheim, Germany TÜV SÜD Energietechnik GmbH Baden-Württemberg IAEA-Conference Vienna

2 Overview Plant History Reasons for Retrofitting Structure of the Reactor Power I&C System Phase Plan for Project Execution Entsorgung und Stilllegung System Engineering Quality-assurance Measures Preparatory Infrastructural Measures Commissioning of the Digital Control System Conclusion TÜV SÜD Energietechnik GmbH Baden-Württemberg IAEA-Conference Vienna

3 Plant History - Pressurized-water reactor of the 2nd generation - Pre-convoy series - Erection starts in July Commercial operation since April Electrical nominal gross output approx.1450 MW - Retrofitting the Reactor Power I&C System as well as the In-Core Neutron Flux Measuring System Analog Technology Modern Digital Control System TÜV SÜD Energietechnik GmbH Baden-Württemberg IAEA-Conference Vienna

Reasons for Retrofitting Optimization of the plant's operational performance Improving the procedures in the event of disturbances or failures Better identification of abnormal operating states

4 Reasons for Retrofitting Optimization of the plant's operational performance Improving the procedures in the event of disturbances or failures Better identification of abnormal operating states Optimization of the reactor power I&C messages and displays Increasing the plant's reliability, safety and availability Facilitation in future repair procedures / spare parts deliveries Upgrade the plant to the latest state of the art Modern and type-tested digital control system for safety I&C applications TÜV SÜD Energietechnik GmbH Baden-Württemberg IAEA-Conference Vienna

Structure of the Reactor Power I&C System (single redundancy) Process variables Control room Switchgear building Recording/ Processing Voter Limitation system Drives Recording/ Processing Limitation

5 Structure of the Reactor Power I&C System (single redundancy) Process variables Control room Switchgear building Recording/ Processing Voter Limitation system Drives Recording/ Processing Limitation system Voter Voter In-Core Measuring system FO FO FO FO = Fibre Optics Reactor control systems Monitoring & Service Interface Conventional annunciation system Switch Switch Switch Gateway Gateway Plant process computer Emergency building Drives Control rod groups Drives Service Unit TÜV SÜD Energietechnik GmbH Baden-Württemberg IAEA-Conference Vienna

Reactor control systems Monitoring & Service Interface Conventional annunciation system Switch Switch Switch Gateway Gateway Plant process

6 Structure of the Reactor Power I&C System (all redundancy levels) Process variables Control room Switchgear building Recording/ Processing Voter Limitation system Drives Recording/ Processing Limitation system Voter Voter In-Core Measuring system FO FO FO FO = Fibre Optics Reactor control systems Monitoring & Service Interface Conventional annunciation system Switch Switch Switch Gateway Gateway Plant process computer Emergency building Drives Control rod groups Drives Service Unit TÜV SÜD Energietechnik GmbH Baden-Württemberg IAEA-Conference Vienna

7 Phase Plan for Project Execution Project phase Project start Projekt end P000 P100 M7 P800 Acceptance Simulator phase S200 S2 S300 S3 S400 Q5/1 Engineering phase Manufacturing phase Concepts System folder E100 Q1 E200 Q2 E300 Q3 E500 Factory acceptance test instructions Analysis Acceptance H300 H3 H400 Q4 H500 Q5/2 Q5a Q5c Phase/Subphase Test step / Acceptance Milestone Installation/Commissioning phase Installation design Acceptance M500 M5 Q5b Q5 M600 Q6 M700 Phase plan structures the project activities Phase plan provides for a transparent and quality-assured implementation of the entire project TÜV SÜD Energietechnik GmbH Baden-Württemberg IAEA-Conference Vienna

System Engineering Formal tests Formal tests

requirements Specification Project database

SPACE- Editor Process engineer I&C engineer

System engineering by using tool system SPACE

graphic editor, code generators and testing

Generates executable programmes automatically

8 System Engineering Formal tests Formal tests Integration Testing station Functional requirements Specification Project database Code generating System code Compiling Load SPACE- Editor Process engineer I&C engineer Function charts Validation by SIVAT REDIFF System engineering by using tool system SPACE SPecification And Coding Environment Provides graphic editor, code generators and testing tools Generates a consistent specification Generates executable programmes automatically TÜV SÜD Energietechnik GmbH Baden-Württemberg IAEA-Conference Vienna

SIVAT (Simulation & Validation Tool) Test case1 Output variable Test specification Test case 2 SIVAT Simulator Input variable Test case 3 Function

functions after the code generation Generating the test specifications on basis of the function charts Simulation run based on test scripts

9 SIVAT (Simulation & Validation Tool) Test case1 Output variable Test specification Test case 2 SIVAT Simulator Input variable Test case 3 Function charts Test scripts Result files/plots SIVAT provides a simulation environment for the control system Discrete tests on the engineered control functions after the code generation Generating the test specifications on basis of the function charts Simulation run based on test scripts Identifying and elimination of project engineering errors at an early phase TÜV SÜD Energietechnik GmbH Baden-Württemberg IAEA-Conference Vienna

REDIFF (Redundancy-Comparison-Tool) System code REDIFF Error reports Consistency check Function charts REDIFF provides a redundancy comparison tool Checking the redundant function charts for

10 REDIFF (Redundancy-Comparison-Tool) System code REDIFF Error reports Consistency check Function charts REDIFF provides a redundancy comparison tool Checking the redundant function charts for consistency Shows the discrepancies between redundant function charts Identifying and elimination of project engineering errors at an early phase TÜV SÜD Energietechnik GmbH Baden-Württemberg IAEA-Conference Vienna

trends examined Result of the examination: The changes in the reactor power I&C system functions fulfilled the criteria

11 Quality-assurance Measures (ATHLET) Simulator program ATHLET enables computer-aided modeling of reactor protection functions limitation functions major control functions Examination and recalculation of transient trends 35 Transient trends examined Result of the examination: The changes in the reactor power I&C system functions fulfilled the criteria defined in the Reactor Safety Commission guidelines TÜV SÜD Energietechnik GmbH Baden-Württemberg IAEA-Conference Vienna

plant transients Result of the Simulations : Verifying of the specified functions and the improvements made for an operational plant

12 Quality-assurance Measures (Plant Simulator) Adaptations on the plant simulator in the test center in Essen system and peripheral specific Integral test of the interactions between the control functions by simulating the process variables Simulations included the performance of plant transients Result of the Simulations : Verifying of the specified functions and the improvements made for an operational plant optimization Transferring specific know-how to the on-plant personnel TÜV SÜD Energietechnik GmbH Baden-Württemberg IAEA-Conference Vienna

Preparatory Infrastructural Measures (Plant Process Computer)

process computer Additional display computer Preceding project to

single-computer systems into a redundant high-performance and

human-machine-interface by modern on-screen-based operating and

13 Preparatory Infrastructural Measures (Plant Process Computer) Monitoring computer Reactor protection monitoring computer Plant process computer Additional display computer Preceding project to replace the plant process computer Integration of the existing single-computer systems into a redundant high-performance and consistent plant process computer Optimization of the human-machine-interface by modern on-screen-based operating and visualizing techniques as well as the control room design TÜV SÜD Energietechnik GmbH Baden-Württemberg IAEA-Conference Vienna

Preparatory Infrastructural Measures (Power Supply

supply system Identifying the power and space

Preparation of the battery rooms for an increase in

outgoing circuits and a discharge inverter for the

14 Preparatory Infrastructural Measures (Power Supply System) Preceding project for upgrading the power supply system Identifying the power and space requirements of the new reactor power I&C system Preparation of the battery rooms for an increase in capacity Installation of switch bays with additional outgoing circuits and a discharge inverter for the batteries TÜV SÜD Energietechnik GmbH Baden-Württemberg IAEA-Conference Vienna

Preparatory Infrastructural Measures (Marshalling Cabinets) Reactor power I&C Old system Original cable connections Plant connection Measurement Binary

rods Drives and so on Marshalling cabinets with two terminal sides (system connection side, plant connection side) which are linked via planned

the control cabinets Signal-specific preliminary tests (cold tests) independent of the overhaul activities Detecting and elimination of wiring errors

15 Preparatory Infrastructural Measures (Marshalling Cabinets) Reactor power I&C Old system Original cable connections Plant connection Measurement Binary sensor Reactor power I&C New digital system System side Reactor power I&C Marshalling cabinet Plant side New or pulled back cable connections Control rods Drives and so on Marshalling cabinets with two terminal sides (system connection side, plant connection side) which are linked via planned transverse connections (TC) Connecting the system cables of the digital control system to the system connection side already after the installation of the control cabinets Signal-specific preliminary tests (cold tests) independent of the overhaul activities Detecting and elimination of wiring errors prior to the overhaul activities More time for the remaining overhaul activities TÜV SÜD Energietechnik GmbH Baden-Württemberg IAEA-Conference Vienna

Commissioning of the Digital Control System Tests on plant operation Process-specific tests on plant startup Process-specific tests of the limitation and reactor control functions

system in step by step I&C commissioning tests process-specific commissioning tests Consistent documentation of the commissioning procedure Tests in the presence of the officially

16 Commissioning of the Digital Control System Tests on plant operation Process-specific tests on plant startup Process-specific tests of the limitation and reactor control functions Process-specific tests on plant standstill I&C hot commissioning tests I&C cold test / Island mode operation I&C-Signal and gateway tests, Drives testing Commissioning of the entire system in step by step I&C commissioning tests process-specific commissioning tests Consistent documentation of the commissioning procedure Tests in the presence of the officially appointed inspector Quality assured procedure to ensure the specified control and process-specific functionality TÜV SÜD Energietechnik GmbH Baden-Württemberg IAEA-Conference Vienna

17 Conclusion Project execution on basis of a phase plan Documentation along with the phase-specific tests Preparatory infrastructural measures Consistent using of quality assurance measures Participation of the officially appointed inspector TÜV SÜD Energietechnik Performing a fluently commissioning procedure on the plant Despite the large volume of replacement work successfully retrofitting of the reactor power I&C system without causing a relevant extension of a periodic plant standstill Fulfillment of the stringent quality requirements applicable to such a complex system TÜV SÜD Energietechnik GmbH Baden-Württemberg IAEA-Conference Vienna

18 Thank you for your attention! TÜV SÜD Energietechnik GmbH Baden-Württemberg IAEA-Conference Vienna

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