apr1400-z-j-ec-14004-np, control system ccf analysis
TRANSCRIPT
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APR1400-Z-J-EC-14004-NP
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NON-PROPRIETARY
Control System CCF Analysis Technical Report
● Introduction
● Credible Failure Type
● Control System Design Features
● Evaluation for Control Signals Sent to ESF-CCS
● Evaluation for Failure Type 1
● Evaluation for Failure Type 2
● Evaluation for Failure Type 3
● Evaluation for Failure Type 4
● Summary
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APR1400-Z-J-EC-14004-NP
Chapter 7 I&C
1
Introduction
Control System CCF Analysis TeR (APR1400-Z-J-NR-14001)
NRC letter comments (Dec. 19, 2013)
− The application did not provide sufficient information for the software
common cause failures of non-safety related control systems that can lead
to spurious actuations of redundant safety and non-safety components.
KHNP plan proposed at the 13th PARM (Feb. 11, 2014)
− Committed to submit a new Control system SWCCF Analysis TeR.
− Proposed four Failure Modes (i.e., four Failure Types).
− Presented evaluation example of the Failure Type 1.
− Assumptions for four Failure Types
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APR1400-Z-J-EC-14004-NP
Chapter 7 I&C
2
TS
Introduction NRC Major Feedbacks and Comments
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APR1400-Z-J-EC-14004-NP
Chapter 7 I&C
3
MCRSC
System Level Switches
TORO EO
DIS
Mini-LDPQIAS-NQIAS-PDIS SODP
RTSS(A1,B1,C1,D1,A2,B2,C2,D2)
APC-S(A,B,C,D)
CIM(A,B,C,D)
FissionChamber
I
I
I
Non-safety Components(Sensors, Txs, Pumps, Valves, etc.)
T/GComponents
ENFMS(A,B,C,D)
I
ESF-CCSLC
(A,B,C,D)
MSISAct.
IFPD
RSR
IFPD
IPS
DIS QIAS-P QIAS-N QIAS-N QIAS-N
T / GCSFIDASP - CCS GC / LCPCS
I
QIAS-P(A,B)
LegendDAS
APC-S: Auxiliary Process Cabinet - SafetyCCG: Control Channel GatewayCIM: Component Interface ModuleCPCS: Core Protection Calculator SystemCPM: Control Panel MultiplexerDAS: Diverse Actuation SystemDIS: Diverse Indication SystemDCN-I: Data Communication Network-Information
I : IsolatorIFPD: Information Flat Panel DisplayIPS: Information Processing SystemITP: Interface and Test ProcessorLC: Loop ControllerLDP: Large Display PanelMCR: Main Control Room
PPS(A,B,C,D)
ESF-CCSGC
(A,B,C,D)
OM(A,B,C,D)
LDP
ITP(A,B,C,D)
RxTrip
Common platform for Safety I&C
Common platform for Non-Safety I&C
Dedicated equipment for the System
Display or Soft control device
Safety System Data Network (SDN)
Non-safety Network (DCN-I)
Serial Data Link (SDL)
Hardwired connectionPPS
Diverse platform for DAS
MinimumInventory
IncoreDetector
Safety-related Non-Safety
Other Channels
DPS(N1,N2,N3,N4)
ESF-CCS GC
DMA: Diverse Manual ESF ActuationDPS: Diverse Protection SystemENFMS: Ex-core Neutron Flux Monitoring SystemESCM: ESF-CCS Soft Control ModuleESF-CCS: Engineered Safety Features - Component Control SystemFIDAS: Fixed In-core Detector Amplifier SystemGC: Group ControllerG: Gateway
MTP: Maintenance and Test PanelNPCS: NSSS Process Control SystemMSIS: Main Steam Isolation SystemOM: Operator ModuleP-CCS: Process-Component Control SystemPCS: Power Control SystemPPS: Plant Protection System
QIAS-P/N: Qualified Indication & Alarm System – P / Non-safetyRSR: Remote Shutdown RoomRTSS: Reactor Trip Switchgear SystemRx : ReactorSC: Safety ConsoleSODP: Shutdown Overview Display PanelT/GCS : Turbine/Generator Control System
Safety Components(Sensors, Txs, Pumps, Valves, etc.)
CIM RTSS
DMA
RxTrip
`
CPCS(A,B,C,D)
CPM(A,B,C,D)
Rev.1
G
G G
OperatingBypass
SetpointReset
RxTripDMA ESF
Act.
OM
Operat.Bypass
SetpointReset
RTSSCPM
(A,B,C,D)
Type AVariables
QIAS-P
SDN
SDNDCN-I DCN-I
ESCM(A,B,C,D)
ESCM(A,B,C,D)
MTP(A,B,C,D)
G
QIAS-NG
ESCM(A,B,C,D)
CCG(A,B,C,D)
Ethernet
NPCS
CCG
Introduction Credible Failure Boundary
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APR1400-Z-J-EC-14004-NP
Chapter 7 I&C
4
TS
Introduction Control System Overview - Primary & Secondary System
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APR1400-Z-J-EC-14004-NP
Chapter 7 I&C
5
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Credible Failure Type Credible Failure Types of Control System CCF
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APR1400-Z-J-EC-14004-NP
Chapter 7 I&C
6
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Credible Failure Type Initiating Event Selection for Failure Types 1, 2, 3 & 4
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APR1400-Z-J-EC-14004-NP
Chapter 7 I&C
7
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Credible Failure Type Failure Type Overview
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APR1400-Z-J-EC-14004-NP
Chapter 7 I&C
8
Control System Design Features
Each control group assigned to separate controller(s) to limit the failure in the control group (segmentation)
Redundant controller for availability enhancement Interlock/ permissive functions by separate control group or safety system
to limit the failure effects (e.g., CEAs withdrawal interlock signals, TBV permissive signals)
Control signal validation to limit a single input failure of redundant channel inputs (i.e., large deviation of redundant inputs)
Redundant analog input modules with auto signal selection algorithm to limit the failure effect of a single module (i.e., out of range)
Hardwired signal interface of shared signals between major control groups[1]
Self-diagnostics and abnormal alarming Structured software development process Test before and after installation [1] Major control groups consist of RRS/RPCS, DRCS, PPCS, PLCS, SBCS Main/Permissive,
FWCS1/2 and are called as nuclear steam supply system (NSSS) control system.
Control System Design Features against CSCCF
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APR1400-Z-J-EC-14004-NP
Chapter 7 I&C
9
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Control System Design Features Design Features - Segmentation
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APR1400-Z-J-EC-14004-NP
Chapter 7 I&C
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Control System Design Features Design Features – Segmentation (Cont’d)
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APR1400-Z-J-EC-14004-NP
Chapter 7 I&C
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Control System Design Features Design Features - Segmentation (Cont’d)
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APR1400-Z-J-EC-14004-NP
Chapter 7 I&C
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Evaluation for Control Signals Sent to ESF-CCS Evaluation Result
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APR1400-Z-J-EC-14004-NP
Chapter 7 I&C
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Evaluation for Control Signals Sent to ESF-CCS Evaluation Result (Cont’d)
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APR1400-Z-J-EC-14004-NP
Chapter 7 I&C
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Evaluation for Control Signals Sent to ESF-CCS Evaluation Result (Cont’d)
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Chapter 7 I&C
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Evaluation for Failure Type 1 Evaluation Method
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APR1400-Z-J-EC-14004-NP
Chapter 7 I&C
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Evaluation for Failure Type 1 Shared Signal List (1/2)
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APR1400-Z-J-EC-14004-NP
Chapter 7 I&C
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Evaluation for Failure Type 1 Shared Signal List (2/2)
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APR1400-Z-J-EC-14004-NP
Chapter 7 I&C
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Evaluation for Failure Type 1 Evaluation Result (example)
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APR1400-Z-J-EC-14004-NP
Chapter 7 I&C
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Evaluation for Failure Type 1 Evaluation Result (summary)
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Chapter 7 I&C
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Evaluation for Failure Type 1 Evaluation Result (summary) (Cont’d)
Detailed evaluation result will be included in TeR.
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APR1400-Z-J-EC-14004-NP
Chapter 7 I&C
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Evaluation for Failure Type 2 Evaluation Method
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Chapter 7 I&C
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Evaluation for Failure Type 2 Evaluation Result (example)
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Evaluation for Failure Type 2 Evaluation Result (example) (Cont’d)
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Evaluation for Failure Type 3 Evaluation Method
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Evaluation for Failure Type 3 Best Estimate Method with Realistic Assumption
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Evaluation for Failure Type 3 Available Systems Credited in the Evaluation
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Evaluation for Failure Type 3 Qualitative Evaluation
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Evaluation for Failure Type 3 Quantitative Analysis
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Evaluation for Failure Type 3 Quantitative Analysis Tool : RELAP5
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Evaluation for Failure Type 3 Initialization of RELAP5 for Nominal Initial Condition
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Evaluation for Failure Type 3 Challenge to Fuel Cladding Integrity
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Evaluation for Failure Type 3 Challenge to Fuel Cladding Integrity (Cont’d)
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Evaluation for Failure Type 3 Challenge to Fuel Cladding Integrity (Cont’d)
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Evaluation for Failure Type 3 Challenge to Fuel Cladding Integrity (Cont’d)
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Evaluation for Failure Type 3 Challenge to Fuel Cladding Integrity (Results)
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Evaluation for Failure Type 3 Challenge to Primary System Integrity (Results)
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Evaluation for Failure Type 4 Evaluation Method
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Summary Summary of Results