Design Characteristics and Classification Issue of the I&C Systems for the JRTR

Transcription

1 TRTR 2013 Annual Conference, September 23-26, St. Louis, MO Design Characteristics and Classification Issue of the I&C Systems for the JRTR J. Y. Keum*, J. Y. Park*, H.S. Kim**, and Y. K. Kim* * Republic of Korea, Korea Atomic Energy Research Institute ** Republic of Korea, Chungnam National Univ. KAERI 1

2 Contents - Overview of JRTR I&C * Configuration of JRTR I&C Systems * Main I&C Classification Issue - Design Features and Classification of JRTR I&C Systems - Conclusion 2

3 Configuration of JRTR I&C System MCR Safety Information Network Non-Safety Network PAMS-A PAMS-B ASTS Hardwired Connection Safety Data Flow Non-Safety Information Flow Safety Network SCR Manual Trip RPS-A RPS-B RPS-C BP BP BP 2/3 Voting 2/3 Voting 2/3 Voting LDP Controller RASS VDU/Soft Controllers Manual Trip Safety System VDU Controller Manual Trip Integrated Monitoring & Control Network (Non-Safety) Instrument Room HP Room IPS APS-A APS-B RRS PICS A PICS B MCR HVAC RMS NMS/PNMS/RGMS/PRMS/PGMS /PI(S) CAR/SSR Circuit Breaker NMS(N)/PNMS(N)/PI(N) CAR/SSR Contactor CAR Stepping Motor Sensors/Pumps/Valves PCS/SCS/HWS PWMS/EWSS/HTWS Liquid/Solid RS Service Water System Compressed 3 Air System Electrical System NAAF System Accelerometers Free Field Mat Foundation Pool Top CR or Roof NMS/ PI(S) Gamma Area Monitor Liquid Monitor Gaseous Effluent Monitor Stack Monitor Particle / Iodine/ Noble Gas / Tritum Monitor 3

4 Main I&C Classification Issue (1) Design Basis for I&C Safety Classification IAEA Safety Standards No. NS-R-4, Safety of Research Reactor, ANSI/ANS 51.1(1983) Nuclear safety criteria for the design of stationary pressurized water plants MEST Notice, Korea MEST (Ministry of Education, Science and Technology)

5 Main I&C Classification Issue (2) Items for Quality Class T based on ANSI/ANS 51.1 & MEST ( ) MEST Notice, Korea Some NNS equipment has one or more selected, but limited, requirements that are specified to ensure acceptable performance of specific NNS functions below 1. Processing of radioactive waste 2. Purification of radioactive material during normal operation 3. Processing of radioactive waste from irradiated neutron absorbers for reuse 4. Monitoring of radioactive effluents -> (RMS) 5. Resisting the failure of SC-1/2/3 equipment s safety functions Protecting SC-2/3 equipment for safe shutdown following fire 13. Monitoring of Variables : - plant operating conditions on technical specification limits -> (PICS & IPS) - status of protection system bypasses -> (IPS-BISI) - status of SC-1/2/3 equipment -> (IPS from RPS & PAMS) - aid in determining the cause or consequences of events for post accident investigation -> (IPS Type D of PAMS) 5

6 Reactor Protection System CHANNEL A CHANNEL B CHANNEL C TR-SENSOR AND TRANSMITTER TR TR TR TR TR TR BISTABLE FUNCTION TRIP & EACH ESF FUNCTION, PER CHANNEL (Digital-based) CH-A BISTABLE PROCESSOR A B C CH-A MAINT. & TEST PROCESSOR CH-B BISTABLE PROCESSOR A B C CH-B MAINT. & TEST PROCESSOR CH-C BISTABLE PROCESSOR A B C CH-C MAINT. & TEST PROCESSOR Design Features - 3 Redundant Channels - Hybrid of Digital and Analog GENERAL COINCIDENCE LOGIC TRIP & EACH ESF FUNCTION, PER CHANNEL (Analog-based) A B C CH-A COINCIDENCE LOGIC CH-A IF.& TEST PROCESSOR A B C CH-B COINCIDENCE LOGIC CH-B IF.& TEST PROCESSOR A B C CH-C COINCIDENCE LOGIC CH-C IF.& TEST PROCESSOR - Provisions of Manual Initiation - ESF Actuation INITIATION LOGIC TRIP & EACH ESF FUNCTION, PER CHANNEL CH-A INITIATION LOGIC CH-B INITIATION LOGIC CH-C INITIATION LOGIC Classification - Safety Class: 3 ACTUATION LOGIC FOR EACH TRIP, SB, CI FUNCTION A B C CRDM TRIP ACTUATION LOGIC A B C SSDM TRIP ACTUATION LOGIC A B C SB ACTUATION LOGIC A B C CID ACTUATION LOGIC - Seismic Category: I - Quality Class: Q TRIP FUNCTION CRDM TRIP SSDM TRIP ESF FUNCTION SB ACTUAT ION CID ACTUATIO N NOTE: HARDWIRED CABLE INTERNAL NETWORK 6

7 Alternate Protection System (1) CHANNEL A CHANNEL A Design Features TR-SENSOR AND TRANSMITTER TR TR TR TR - Diverse protection against a CCF of RPS - Two Redundant Channels with 2- out-2 Coincidence Logic APS CH A BISTABLE CONTROLLER APS CH B BISTABLE CONTROLLER - Physical separation and electrical isolation from the RPS MANUAL TRIP INITIATION CIRCUIT INITIATION CIRCUIT MANUAL TRIP - Manual initiation - APS trip parameters to be selected by DID & Diversity (D3) analysis ACTUATION CIRCUIT RPS VAC 120VAC + - RPS ACTUATION CIRCUIT - No credit in safety analysis CRDM #1 CRDM #2 CRDM #3 CRDM #4 SSDM #1 SSDM #2 7

8 Alternate Protection System (2) Bases on Classification Diverse mean to act against the software CCF of RPS, which is beyond design basis accident (Not for DBA) USNRC-0800 (SRP) allows it non-safety feature but a special QA requirements as per NRC Generic Letter under 10CFR Korean (US-based) practice on the non-safety ATWS to NPPs A safety-grade second protection system need not a mandatory but an option depending on the characteristics of research reactor. Classification Safety Class NNS from Korean (US) regulation Item important to safety (safety related) from IAEA Quality class : T Seismic category : Non-Seismic 8

9 Post Accident Monitoring System (1) Design Features - 2 Redundant Channels - Digital computers - Critical analog displays in SCR Classification - Safety Class: 3 - Seismic Category: I - Quality Class: Q 10 Safety Parameters Type Subgroup Category PAMS Variables Type A Plant Specific - N/A Type B Type C Type D 23 Non-safety Parameters Reactivity Control 1 Ex-core neutron Core Cooling Confinement Integrity 1 PCS flow 1 Core differential pressure 1 Reactor outlet temperature 1 PAMS pool level 1 Flap valve 1 position 1 Flap valve 2 position 1 Confinement isolation damper position Fuel Cladding 1 Pool surface radiation PCS Boundary Integrity Reactivity Control Core Cooling Auxiliary/Emergen cy Water Supply System 1 PCS neutron (FFDS) 3 CAR 1 down position 3 CAR 2 down position 3 CAR 3 down position 3 CAR 4 down position 3 SSR 1 down position 3 SSR 2 down position 2 EWSS pool level 2 Pool water temperature 3 Flap valve 1 position 3 Flap valve 2 position 2 EWSS flow 2 EWSS injection valve position 3 DWST water level 3 Service pool water level 3 Service pool water temp. RCI Ventilation 2 RCI ventilation recirculation mode Power Supplies 2 EPS status 3 EPS oil status 2 UPS status Area Radiation 2 Reactor hall gamma activity Type E Airborne Radioactive Materials Released from Plant 2 Stack particulate activity 2 Stack iodine activity 2 Stack noble gases activity 9

10 Post Accident Monitoring System (2) Train A Instruments Safety Signals A (10 parameters) RPS ITP-A Non-safety Signals (29 parameters) Train B Instruments Safety Signals B (10 parameters) RPS ITP-B Signal Input Module Communication Link Module IPS HDSR Signal Input Module Communication Link Module PAMS Processor Module A PAMS Processor Module B Isol. Isol. 19 Flat Panel Display PC (Display of Category 1 Train A Parameters) Data Storage Device PAMS Channel A Cabinet Category 1 Signals to IPS 19 Flat Panel Display PC (Display of Category 1 Train B Parameters) PAMS Channel B Cabinet Data Storage Device 10 OWS PAMS displays at the MCR

11 Reactor Regulating System Design Features : - Dual redundant system - Reactor power control using a closed loop feedback control algorithm - Stepping motor mechanism Classifications : - Safety Class : Non-nuclear safety - Seismic Category : Non - Quality Class : T 11

12 Process Instrumentation & Control system Design Features : - Dual Redundant digital computer system - Control of process systems equipment (pumps, valves, fans, heaters and etc.) - Continuous monitoring of process - Data and Alarm processing - No credit in safety analysis Classification : - Safety Class Non Nuclear Safety from Korean regulation Item important to safety (safety related) from IAEA - Seismic Category : Non Seismic - Quality Class : T 12

13 Automatic Seismic Trip System (1) Design Features - Reactor trip if the earthquake motion exceeds the level of OBE at the site. - Monitoring and analysis of the seismic motion of the site in a continuous basis. - Major components of ASTS Five (5) tri-axial accelerometers One (1) seismic switch for OBE One (1) ASTS cabinets 13

14 Automatic Seismic Trip System (2) Bases on Classification Earthquake is classified to a special event (not a DBA), which is not required safety SSCs in the Korea regulations. ASTS component considered to be at mild conditions during the earthquake No need to apply the EQ requirements for safety system but enough with seismic qualification USNRC RG1.12 & ANS 2.2 considered enough as the SMS(Seismic Monitoring System for power plant. ( No requirement of shutdown at earthquake) Korean (US-based) practice on the non-safety ASTS to NPPs Classification Safety Class NNS from Korean (US) regulation Item important to safety (safety related) from IAEA Quality class : T Seismic category : I 14

15 Information Processing System (1) Design Features - Plant information processing (collecting, recording, retrieval) - Alarm processing - Providing key process variables to ERFs - Redundant architecture for high availability - Isolation from safety systems Operation Level Information Level (IPS Coverage) MCR Large Display OWS Interfacing Layer between Operation and Control RR-wide Status Monitoring OWS Integrated Information Provision to MCR/SCR Historical & Centralized Database Management System OWS SCR Large Display Redundant IPS Servers Process Variable Monitoring Logics Process Variable Monitoring Logics Reactor Information Management Reactor Information Management Alarm Processing RR Centralized Alarm LogicsProcessing DBMS RR Centralized Logics In/Out Processing DBMS In/Out LogicsProcessing Logics Engineering Computer Network Control, Monitoring and Management Network Control Network Controller Network Controller Redundant Monitoring & Control Networks Control Level Protection Status Regulating Status Process Instruments Status Radiation, Seismic, HVAC Status Field Level 15

16 Information Processing System (2) Bases on Classification No safety functions (No credit in safety analysis) Comparison & Korean practice Classification Safety Class NNS from Korean (USNRC) regulation Safety Related from IAEA Quality class : T Seismic category : II (Operator security) 16

17 Operator WorkStation (1) Functions To display monitoring information received from IPS To display control interfaces for control commands to be sent to RRS and PICS Interfacing Systems via non-safety networks IPS: monitoring information PICS: control commands RRS: control commands < Data flow diagram > < Interfacing systems via networks> 17

18 Operator WorkStation (2) Bases on Classification No safety functions (No credit in safety analysis) Korean practice Classification Safety Class NNS from Korean (USNRC) regulation Safety Related from IAEA Quality class : T (Reinforcing QA activities required) Seismic category : II (Operator security) 18

19 Radiation Monitoring System (1) Design Features - Measuring, indicating and alarming radiation level to H/P room and MCR - Data Acquisition - Functions of monitors Gamma Area monitoring Gas effluent monitoring Stack monitoring Iodine monitoring Particle monitoring - Safety-related monitors designated to RPS - Independent network GAMMA AREA MONITOR PARTICLE MONITOR IODINE MONITOR GAS EFFLUENT MONITOR STACK MONITOR INSTRUMENT ROOM IPS RMS RMS Computer MAIN CONTROL ROOM Operator Workstation - Local alarms FIELD HEALTH & PHYSICS ROOM 19

20 Radiation Monitoring System (2) Bases on Classification No safety functions (No credit in safety analysis) All the safety related radiation channels (RGMS, PNMS, PRMS, PGMS) are classified to safety class as the RPS trip parameters Classification Safety Class NNS from Korean (USNRC) regulation Item not important to safety from IAEA Quality class : S The effluent monitoring channels are the quality class T. Seismic category : Non-Seismic 20

21 Concluding Remarks System USNRC Safety Class IAEA Seismic Category S/W Class Quality Class Remark RPS SC-3 Safety system I SC Q PAMS SC-3 Safety system I SC Q RRS Non-Safety Safety related Non NS T APS Non-Safety Safety related Non ITS T IPS Non-Safety Safety related Non NS S->T ASTS Non-Safety Safety related I ITS T PICS Non-Safety Safety related Non NS S->T RMS - Area Monitor Non-Safety Non NS S RMS Effluent Monitor Non-safety Safety related Non NS S->T OWS Non-Safety Safety related II NS S->T LDP Non-Safety II NS S Quality Upgrade Quality Upgrade Quality Upgrade Quality Upgrade 21