APR1400-Z-J-EC-14004-NP, Control System CCF Analysis ...

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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




● 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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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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Introduction Control System Overview - Primary & Secondary System

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Credible Failure Type Credible Failure Types of Control System CCF

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Credible Failure Type Initiating Event Selection for Failure Types 1, 2, 3 & 4

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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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Control System Design Features Design Features - Segmentation

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Control System Design Features Design Features – Segmentation (Cont’d)

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Control System Design Features Design Features - Segmentation (Cont’d)

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Evaluation for Control Signals Sent to ESF-CCS Evaluation Result

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Evaluation for Control Signals Sent to ESF-CCS Evaluation Result (Cont’d)

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Evaluation for Control Signals Sent to ESF-CCS Evaluation Result (Cont’d)

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Evaluation for Failure Type 1 Evaluation Method

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Evaluation for Failure Type 1 Shared Signal List (1/2)

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Evaluation for Failure Type 1 Shared Signal List (2/2)

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Evaluation for Failure Type 1 Evaluation Result (example)

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Evaluation for Failure Type 1 Evaluation Result (summary)

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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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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 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 (Results)

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Evaluation for Failure Type 3 Challenge to Primary System Integrity

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Evaluation for Failure Type 3 Challenge to Primary System Integrity (Cont’d)

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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 (Cont’d)

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Summary Summary of Results

APR1400-Z-J-EC-14004-NP, Control System CCF Analysis ...

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