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Modernization of IC systems at the NPP Kr ko

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Modernization of IC systems at the NPP Kr ko

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    1. 1 Modernization of I&C systems at the NPP Krško

    2. 2 Introduction NPP Krško Major NPP Krško (I&C) systems modifications implemented since 1983 Process Information System (PIS) Annunciator System Replacement Slovenian (I&C) legislation Conclusion

    3. 3 NPP Krško Westinghouse 2 loop PWR capacity – 700 MWe investment of republic Slovenia and Croatia architect engineering - Gilbert decision for construction - 1970 beginning of operation - September, 1981 synchronisation to electric network - October, 1981 commercial operation - January, 1983

    4. 4 Major NPP Krško I&C systems modifications implemented since 1983 ATWS Mitigation Safeguard Actuation Circuitry (AMSAC) Inadequate Core Cooling Monitoring System (ICCMS) Process Information System (PIS) Annunciator System Off-line data acquisition of chemical analysis data (prim & sec. sampling) - Chemnet RCP and TU Vibration monitoring Core Monitoring and Operations Support System, BEACON-TSM System Meteorological Monitoring System Seismic Instrumentation

    5. 5 Major NPP Krško I&C systems modifications implemented since 1983, cont. SG Blowdown Control (digital discrete controllers and digital indicators) Heater Drain Control, PLC Condensate Polishing, PLC Water Treatment, PLC Switchyard Control & Monitoring (ABB Micro SCADA - although it has remote control capabilities in the MCR it is used for switchyard monitoring only) Emergency Response Data System (ERDS) FP- Fire protection (Detection) system

    6. 6 Process Information System (PIS) The Process Information System (PIS) was installed in NEK in 1992 as part of the post TMI requirements The main purpose of the PIS was to monitor critical functions (Critical Function Monitoring System - CFMS) CFMS was designed to meet SPDS (Safety Parameter Display System) requirements of NUREG-0696 (Functional Criteria For Emergency Response Facilities), NUREG-0737 (Clarification of TMI Action Plan Requirements) Item I.D.2, and NUREG-0737 Supplement 1 Major features of the CFMS include: A Critical Safety Function Monitor which defines conditions to assess the status of six critical safety functions (criticality, core cooling, heat sink, RCS integrity, containment and RCS inventory), Engineering Safety Features equipment monitoring Plant process and area radiation monitoring, and Meteorological conditions monitoring

    7. 7 Process Information System (PIS) Other functions of the PIS are: Insufficient Core Cooling Monitoring System (ICCMS) Post-trip review data acquisition Nuclear process calculations Primary to secondary leakage calculations Calorimetric calculations QPTR evaluations PIS is a non-safety related system used to provide supplementary information to the operator and to inform him of off-normal conditions Data is collected by the redundant data acquisition equipment and transmitted to a fully redundant distributed computer system PIS data is also obtained from other process computers through separate serial or fast Ethernet communication links

    8. 8 Process Information System (PIS) Last upgrade of PIS system (May 2006) included: Wax replaced with Alpha technology The newest ABB PMS platform New data connections (MicroScada, Beacon, VibMon, CK-CPS) Upgraded application software – inclusion of ARP procedures GPS time synchronization The effects of the upgrade were: Improvement of overall PIS performance and availability during transients Expanding the PIS capability to receive and send process parameters to different process computers Easier and less expensive maintenance PIS can now also be used for issuing commands to other non-safety digital control systems Issues during licensing: Effects on safety systems (control room ventilation) Expansion of PIS functions – to control other systems

    9. 9 Annunciator System Replacement former Annunciator System (Betalarm1000) gathered a switching contact and controlled the operation of a lampbox to turn on and off a dedicated lamp window was installed 25 years ago and it was becoming increasingly more difficult to provide technical support and replacement parts new Annunciator System (SER4100 & BL1500) use of flagship sequential event recorder to record switching contact which are time stamped and processed to a number of outputs (annunciators, visual display units, printers and computer for data archiving and post analysis) the BL1500 has been designed to have the identical form factors as the lampboxes supplied 25 years ago with the BL1000. therefore the operators were presented with an identical control room as before the installation

    10. 10 Annunciator System Replacement Advantages of the new system: Event recording Post event analysis Redundancy Expandability Re-configuration flexibility Advanced Alarm Filtering capabilities Availability of spares

    11. 11 Annunciator System Replacement Open issue during licensing: approval of software SNSA has taken into consideration: system standards list NPP reference list Post-performance problem inoperability of power supplier new configuration without power supply redundancy

    12. 12 Slovenian (I&C) legislation ZVISJV: Act on protection against ionizing radiation and nuclear safety (Official Gazette of the Republic of Slovenia no. 67/2002, 24/2003, 46/2004) Reg. E1: Regulation on the conditions for siting, construction, commissioning, commencement of operation and operation of nuclear facilities (Official Gazette of the SFRJ no. 52/88) Reg. E2: Regulation on the compilation and contents of the safety report and other documentation necessary for the assessment of the safety of nuclear facilities (Official Gazette of the SFRJ no. 68/88) Some WENRA requirements on I&C systems are already included in current Slovenian nuclear legislation, and also new regulation (consistent with WENRA) is being prepared Most of the WENRA requirements are already implemented in the Krško NPP

    13. 13 Conclusion During the 20 years of commercial operation more than 400 modifications (and a lot of this modifications are related with I&C system) have been implemented in the NPP Krško The next important modifications will be the DEH (Digital Electro Hydraulic) system for the control and supervision of the TG (Turbine-Generator) set (scheduled for outage 2007) All of these modifications are performed on the non-safety related I&C system New regulations will be in compliance with the WENRA requirements

    14. 14 Thank you for your attention!

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