ML18124A113

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Korea Hydro & Nuclear Power Co, Ltd - Revised Response to RAI 45-7883 for the Question 07.09-2 (Rev.6)
ML18124A113
Person / Time
Site: 05200046
Issue date: 05/04/2018
From:
Korea Hydro & Nuclear Power Co, Ltd
To:
Office of New Reactors
Shared Package
ML18124A110 List:
References
KAW-18-0066, MKD/NW-18-0066L
Download: ML18124A113 (26)


Text

07.09-2_Rev.6 - 1 / 5 KEPCO/KHNP REVISED RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION APR1400 Design Certification Korea Electric Power Corporation / Korea Hydro & Nuclear Power Co., LTD Docket No.52-046 RAI No.:

45-7883 SRP Section:

07.09 - Data Communication System Application Section: 07.09 Date of RAI Issue:

06/23/2015 Question No. 07.09-2 List all safety system to safety system interfaces and their connection types and all safety system to non-safety system interfaces and their connection types.

10 CFR 50.55a(h) requires compliance to IEEE Std. 603-1991. IEEE Std. 603-1991, Clause 5.6.1, states, in part, Redundant portions of a safety system provided for a safety function shall be independent of and physically separated from each other to the degree necessary to retain the capability to accomplish the safety function during and following any design basis event requiring that safety function, and Clause 5.6.3, states, in part, The safety system design shall be such that credible failures in and consequential actions by other systems, as documented in 4.8 of the design basis, shall not prevent the safety systems from meeting the requirements of this standard. RG 1.75 provides guidance on the physical separation requirements of IEEE Std. 603-1991, Clause 5.6. BTP 7-11 provides guidance on application and qualification of isolation devices to meet the electrical isolation requirements of IEEE Std. 603-1991 Clause 5.6. DI&C-ISG-04 provides guidance for meeting the communications independence requirements of IEEE Std. 603-1991, Clause 5.6.

Technical Report, APR1400-Z-J-NR-14001-P, Rev. 0, Safety I&C System, describes the design features of the APR1400 digital I&C system and how the design complies with NRC regulations. Section 4.2.4 of the technical report, "System Interfaces," discusses Plant Protection System (PPS) cabinet interfaces. The applicant provided description for some of the system interfaces and their type (e.g. Auxiliary Process Cabinet - Safety connects to PPS cabinets via hardwire cables, Core Protection Calculator System connects to PPS cabinets via hardwire cables, and PPS sends initiation signals to Engineered Safety Features-Component Control System Group Controllers through fiber optic Serial Data Link). It is not clear how other safety systems and non-safety systems are connected. List all safety to safety system interfaces and their interface type, and to list all safety to non-safety system interfaces and their interface type, and provide information on how these interfaces meet the requirements of IEEE Std. 603-1991, Clause 5.6, or provide a reference to sections of the Non-Proprietary

07.09-2_Rev.6 - 2 / 5 KEPCO/KHNP FSAR or technical reports where this information resides. Update the FSAR with the requested information.

Response - (Rev. 6)

Conformance to IEEE Std. 603 and RG1.75 independence requirements is described and provided in Section 7.1.2.42 of DCD Tier 2 and Appendix A of Safety I&C System Technical Report.

The system interfaces for the PPS, and the connection types, are described in Section 4.2.4 of the Safety I&C System Technical Report. The connection types that are not clearly described in Section 4.2.4 of the Safety I&C System Technical Report were revised to clarify what type of connection is used.

The system interfaces for the core protection calculator system (CPCS), and the connection types, are described in Section 4.3.4 of the Safety I&C System Technical Report. The connection types that are not clearly described in Section 4.3.4 of the Safety I&C System Technical Report were revised to clarify what type of connection is used.

The system interfaces for the ESF-CCS and the connection types are described in Section 4.4.4 of the Safety I&C System Technical Report.

The system interfaces for the qualified indication and alarm system-P(QIAS-P) and the connections types are described in Section 4.5.3 of the Safety I&C System Technical Report.

The connections types that are not clearly described were added to Section 4.5.3 of the Safety I&C System Technical Report.

The interfaces for the reactor trip switchgear system (RTSS), and the connection types, are described in Section 4.8.2 of the Safety I&C System Technical Report. The connection types that are not clearly described in Section 4.8 of the Safety I&C System Technical Report were revised to clarify what type of connection is used.

In summary, Sections 4.2.4, 4.3.4, 4.5.3, and 4.8.2 of the Safety I&C System Technical Report were revised to include the corresponding interface types as indicated on the attached mark-up.

The detailed interface information between redundant portions of the safety system and between the safety and non-safety systems is provided as Tables 1 and 2. These tables (to be incorporated into the Safety I&C System technical report as Tables 4.1-1 and 4.1-2, respectively) also provide clarification of the as-built interface type such as hardwired connection, data link connection (SDL), data network connection (SDN), and Ethernet data link connection. The attached Table 3 (to be incorporated into the Safety I&C System technical report in response to RAI 45-8279 Question 07.09-9 Rev. 1 and is included for information) is provided as the list of interdivisional hardwired links in the ESF-CCS.

Non-Proprietary

07.09-2_Rev.6 - 3 / 5 KEPCO/KHNP Table 1. Interface between redundant portions of the safety system No.

FROM TO SIGNAL DESCRIPTION INTERFACE TYPE Safety I&C TeR Section 1

PPS BP PPS LCL Partial trip SDL 4.2.2.1 2

PPS ESF-CCS GC ESFAS initiation SDL 4.1.1.2, 4.2.3.2, 4.2.3.3, 4.2.4 3-1 ITP Division A ITP Division B CIV signals (74 signals) SDL 4.5.2 3-2 ITP Division C ITP Division B CIV signals (10 signals) SDL 4.5.2 3-3 ITP Division D ITP Division B CIV signals (9 signals) SDL 4.5.2 3-4 ITP Division B ITP Division A CIV signals (69 signals) SDL 4.5.2 3-5 ITP Division C ITP Division A CIV signals (10 signals) SDL 4.5.2 3-6 ITP Division D ITP Division A CIV signals (9 signals) SDL 4.5.2 4 CPP in CPCS CPC/CEAC in CPCS Digitized RSPT values SDL 4.3.2.1 Note 1: The ESF-CCS in each division sends the CIV signals to the ITP of the same division via fiber optical data network connection (SDN).

Table 2. Interface between safety and non-safety system No.

FROM TO SIGNAL DESCRIPTION INTERFACE TYPE Safety I&C TeR Section 1 PPS DRCS Remote I/O Cabinet CWP contact Hardwired 4.2.4 2

DIS QIAS-P Transfer command, HJTC heater power control Hardwired Figure 4-17, Table 4-2 3 QIAS-P DIS CETs, HJTCs, control status Hardwired Figure 4-17, Table 4-2 4

P-CCS ESF-CCS Non-safety control signals for CVCS, steam generator blowdown system, condenser vacuum system, fuel handling area HVAC system, fire protection system, process sampling system, and class 1E 4.16kV system Hardwired 4.4.4.12 5 DMA Switches CIM Actuation signals for ESF components Hardwired 4.1.1.7 6 DPS CIM Component control signals Hardwired 4.1.1.7 7

ITP QIAS-N PPS status alarm, CPC data, Type A,B,C variables, ICC-related variables, SDL 3.3.2, 4.1.1.4, 4.2.2.1, 4.2.3.5, 4.3.1.6, Non-Proprietary

07.09-2_Rev.6 - 4 / 5 KEPCO/KHNP No.

FROM TO SIGNAL DESCRIPTION INTERFACE TYPE Safety I&C TeR Section operating ESF-CCS status for EOP, plant safe shutdown, cabinet trouble alarm, system in test 8

MTP DCS Gateway Server of IPS PPS status alarm, CPC data, Type A,B,C variables, ICC-related calculation variables, control cabinet alarms, system in test Ethernet Data Link 3.3.2, 4.3.1.5 9

IFPD (on each operator console)

ESCM (on each operator console)

Safety component selection information Ethernet Data Link 4.1.2.7 10 PPS TCS (turbine control system)

Turbine trip signal Hardwired 4.2.1.1 11 ENFMS (ex-core neutron flux monitoring system)

NIMS (NSSS integrity monitoring system)

Sub-channel neutron flux signal SDL A.5.6 Some of the descriptions in Section 4.4.4.12, Process-Component Control System of the Safety I&C System technical report were modified as indicated in the attachment. The detailed information on these signals is provided in Sections 4.9.1, 4.9.2, and 4.9.3 of the Control System CCF Analysis technical report and the related mark-up that was provided in the response to RAI 68-7892 Question 07.07-8 Rev. 1 (refer to KHNP submittal MKD/NW 0986L dated September 20, 2016; ML16264A400) and 475-8596 Question 10.04.08-6 (refer to submittal MKD/NW-16-1034L dated October 11, 2016; ML16285A524). The description in Section 4.4.4.12 of the Safety I&C System technical report was revised to include additional clarification that the non-safety signals cannot block the operation of the ESF actuation signals and to reference Section 7.3.1.9 of DCD Tier 2 that was added in the response to RAI 475-8596, Question 10.04.08-6.

A description of the communication with external interfaces, such as the Emergency Operations Facility, will be revised by a new Section 4.6.2.7. The corresponding interface will be revised in Figure 4-1 of the Safety I&C System Technical Report, Figure 4-1 of the Diversity and Defense-in-Depth Technical Report and Figure 7.1-1 of the DCD Tier 2.

Impact on DCD Figure 7.1-1 of the DCD will be revised as indicated in the attached mark-up.

Non-Proprietary

07.09-2_Rev.6 - 5 / 5 KEPCO/KHNP Impact on PRA There is no impact on the PRA.

Impact on Technical Specifications There is no impact on the Technical Specifications.

Impact on Technical/Topical/Environmental Reports Sections 4.6.2.7 and Figure 4-1 of the Safety I&C System Technical Report will be revised as indicated in the attached mark-up.

Figure 4-25 of the Safety I&C System Technical Report will be added as indicated in the attached mark-up.

Figure 4-1 of the Diversity and Defense-in-Depth Technical Report and CCF Coping Analysis TeR will be revised as indicated in the attached mark-up.

Figure 4.1-1 Control System CCF Analysis TeR will be revised as indicated in the attached mark-up.

Non-Proprietary

Safety I&C System APR1400-Z-J-NR-14001-NP, Rev.2 KEPCO & KHNP xviii Non-Proprietary LIST OF FIGURES Figure 4-1 APR1400 I&C System Overview Architecture........................................................................... 26 Figure 4-2 Diversity Design Concept between Protection System and Diverse Protection System.......... 27 Figure 4-3 PPS Functional Block Diagram................................................................................................. 28 Figure 4-4 PPS Block Diagram................................................................................................................... 39 Figure 4-5 PPS Division A Trip Path Diagram............................................................................................ 40 Figure 4-6 Overlap in Functional Testing for the PPS................................................................................ 41 Figure 4-7 Watchdog Timer for PPS........................................................................................................... 42 Figure 4-8 CPCS Block Diagram................................................................................................................ 48 Figure 4-9 Dynamic Adjustments to the Parameters.................................................................................. 51 Figure 4-10 CPC Function Block Diagram.................................................................................................. 53 Figure 4-11 CEA Position and PF Movement............................................................................................. 58 Figure 4-12 CPCS Interface Block Diagram............................................................................................... 59 Figure 4-13 Watchdog Timer for CPCS...................................................................................................... 60 Figure 4-14 ESF-CCS Functional Block Diagram....................................................................................... 61 Figure 4-15 ESF-CCS Functional Configuration......................................................................................... 86 Figure 4-16 ESF-CCS Block Diagram........................................................................................................ 87 Figure 4-17 Simplified Component Control Logic....................................................................................... 88 Figure 4-18 Watchdog Timer for ESF-CCS................................................................................................ 89 Figure 4-19 QIAS-P Block Diagram.......................................................................................................... 102 Figure 4-20 Safety I&C Data Communication System.............................................................................. 111 Figure 4-21 Data Communication between Redundant Divisions in PPS................................................ 112 Figure 4-22 Interface & Test Processor Data Link.................................................................................... 114 Figure 4-23 Data Communication from ITP to QIAS-N............................................................................. 114 Figure 4-24 Data Communication from MTP to IPS................................................................................. 115 Figure 4-25 System Directory - Primary Systems.................................................................................... 119 Figure 4-26 System Directory - Secondary Systems............................................................................... 119 Figure 4-27 System Mimic Page............................................................................................................... 120 Figure 4-28 ESCM Soft Control Template - Discrete Type (Example)..................................................... 120 Figure 4-29 ESCM Soft Control Template - Modulation Type (Example)................................................ 121 Figure 4-30 ESF Control Block Diagram................................................................................................... 125 Figure 4-31 Transfer of ESCM control function signals from MCR to RSR.............................................. 128 Figure 4-32 Transfer of control functions for MI switch signals from MCR to RSR.................................. 129 Figure 4-33 Master transfer switch configuration for P-CCS and PCS..................................................... 130 RAI 45-7883-Question 07.09-2_Rev.6 Attachment(1/21)

Figure 4-25 Signal Flow & Interface Diagram of External Data Communication--------116

Safety I&C System APR1400-Z-J-NR-14001-NP, Rev.2 KEPCO & KHNP xxi CPC(S) core protection calculator (system)

CPIAS containment purge isolation actuation signal CPM control panel multiplexer CPP CEA position processor CPU central processing unit CRC cyclic redundancy checksum CREVAS control room emergency ventilation actuation signal CS communication section CSAS containment spray actuation signal CVCS chemical volume control system CWP CEA withdrawal prohibit D3 diversity and defense-in-depth DAS diverse actuation system DB database DBE design basis event DCD design control document DCN-I data communication network - information DCS distributed control system DI digital input DIS diverse indication system DMA diverse manual ESF actuation DNBR departure from nucleate boiling ratio DO digital output DPS diverse protection system DPRAM dual-ported random access memory DRCS digital rod control system EDG emergency diesel generator EMC electromagnetic compatibility EMI electromagnetic interference ENFMS ex-core neutron flux monitoring system EOF emergency operation facility EOP emergency operating procedure EP Ethernet processor EPRI Electric Power Research Institute ESCM ESF-CCS soft control module ESF engineered safety features Non-Proprietary RAI 45-7883-Question 07.09-2_Rev.6 Attachment(2/21)

EDS External Data communication system

Safety I&C System APR1400-Z-J-NR-14001-NP, Rev.2 KEPCO & KHNP xxiii LCO limiting conditions for operation LDP large display panel LOCA loss of coolant accident LPD local power density LPMS loose parts monitoring system L-R latch-reset MCC motor control center MCR main control room MI minimum inventory MIL Std.

Military Standard MSIS main steam isolation signal MSIV main steam isolation valve MTC MTP/ITP cabinet MTP maintenance and test panel MTS master transfer switch NERC nuclear emergency response center NR narrow range NIMS NSSS integrity monitoring system NPCS NSSS process control system NRC Nuclear Regulatory Commission NSSS nuclear steam supply system O&M operation & maintenance OM operator module P-CCS process - component control system PCS power control system PF penalty factor PI process instrumentation PM processor module PLC programmable logic controller (AC160)

PLCS pressurizer level control system PLD programmable logic device PPCS pressurizer pressure control system PPS plant protection system PRA probabilistic risk analysis PS processing section PVNGS Palo Verde Nuclear Generating Station Non-Proprietary RAI 45-7883-Question 07.09-2_Rev.6 Attachment(3/21)

NDL nuclear data link

Safety I&C System APR1400-Z-J-NR-14001-NP, Rev.2 KEPCO & KHNP 26 MCR SC System Level Switches TO DIS Mini-LDP QIAS-N QIAS-P DIS SODP RTSS (A1,B1,C1,D1, A2,B2,C2,D2)

APC-S (A,B,C,D)

CIM (A,B,C,D)

Fission Chamber I

I I

Non-safety Components (Sensors, Txs, Pumps, Valves, etc.)

T/G Components ENFMS (A,B,C,D)

I ESF-CCS LC (A,B,C,D)

MSIS Act.

IFPD RSR IFPD IPS DIS QIAS-P QIAS-N QIAS-N QIAS-N T/GCS FIDAS P-CCS GC/LC PCS I

QIAS-P (A,B)

DAS PPS (A,B,C,D)

ESF-CCS GC (A,B,C,D)

OM (A,B,C,D)

LDP ITP (A,B,C,D)

Rx Trip PPS Component-Level MI Incore Detector Safety-related Non-Safety Other Divisions DPS (N1,N2, N3,N4)

ESF-CCS GC Safety Components (Sensors, Txs, Pumps, Valves, etc.)

CIM RTSS DMA Rx Trip

`

CPCS (A,B,C,D)

CPM (A,B,C,D)

Rev.1 G

G G

Operating Bypass Setpoint Reset Rx Trip DMA ESF Act.

OM Operat.

Bypass Setpoint Reset RTSS CPM (A,B,C,D)

SDN SDN DCN-I DCN-I ESCM (A,B,C,D)

ESCM (A,B,C,D)

MTP (A,B,C,D)

G QIAS-N G

ESCM (A,B,C,D)

CCG (A,B,C,D)

NPCS CCG Note : Signal paths important to safety are shown only.

DIS IPS I

System-Level MI System-Level MI APC-S: Auxiliary Process Cabinet - Safety CCG: Control Channel Gateway CIM: Component Interface Module CPCS: Core Protection Calculator System CPM: Control Panel Multiplexer DAS: Diverse Actuation System DIS: Diverse Indication System DCN-I: Data Communication Network-Information DMA: Diverse Manual ESF I : Isolator IFPD: Information Flat Panel Display IPS: Information Processing System ITP: Interface and Test Processor LC: Loop Controller LDP: Large Display Panel MCR: Main Control Room MI: Minimum Inventory DPS: Diverse Protection System ENFMS: Ex-core Neutron Flux Monitoring System EOF: Emergency Operation Facility ERDS: Emergency Response Data System ESCM: ESF-CCS Soft Control Module ESF-CCS: Engineered Safety Features - Component Control System FIDAS: Fixed In-core Detector Amplifier System G: Gateway GC: Group Controller MTP: Maintenance and Test Panel NPCS: NSSS Process Control System MSIS: Main Steam Isolation System OM: Operator Module P-CCS: Process-Component Control System PCS: Power Control System PPS: Plant Protection System QIAS-P/N: Qualified Indication & Alarm System - P / Non-safety RCC: Remote Control Center RSR: Remote Shutdown Room RTSS: Reactor Trip Switchgear System Rx: Reactor SC: Safety Console SODP: Shutdown Overview Display Panel T/GCS: Turbine/Generator Control System TSC: Technical Support Center, Txs: Transmitter Legend 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(AF100))

Data Communication Network-I (DCN-I)

Serial Data Link (SDL(HSL))

Hardwired connection Diverse platform for DAS Ethernet LC P-CCS Component Switches RCC ESCM (A,B,C,D)

ESF-CCS LC VLAN Switches Firewall Ethernet Hub EOF & ERDS TSC IFPD Figure 4-1 APR1400 I&C System Overview Architecture Non-Proprietary RAI 45-7883-Question 07.09-2_Rev.6 Attachment(4/21)

Replace with A on the following page

MCR SC System Level Switches TO DIS Mini-LDP QIAS-N QIAS-P DIS SODP RTSS (A1,B1,C1,D1, A2,B2,C2,D2)

APC-S (A,B,C,D)

CIM (A,B,C,D)

Fission Chamber I

I I

Non-safety Components (Sensors, Txs, Pumps, Valves, etc.)

T/G Components ENFMS (A,B,C,D)

I ESF-CCS LC (A,B,C,D)

MSIS Act.

IFPD RSR IFPD IPS DIS QIAS-P QIAS-N QIAS-N QIAS-N T/GCS FIDAS P-CCS GC/LC PCS I

QIAS-P (A,B)

DAS PPS (A,B,C,D)

ESF-CCS GC (A,B,C,D)

OM (A,B,C,D)

LDP ITP (A,B,C,D)

Rx Trip PPS Component-Level MI Incore Detector Safety-related Non-Safety Other Divisions DPS (N1,N2, N3,N4)

ESF-CCS GC Safety Components (Sensors, Txs, Pumps, Valves, etc.)

CIM RTSS DMA Rx Trip

`

CPCS (A,B,C,D)

CPM (A,B,C,D)

Rev.2 G

G G

Operating Bypass Setpoint Reset Rx Trip DMA ESF Act.

OM Operat.

Bypass Setpoint Reset RTSS CPM (A,B,C,D)

SDN SDN DCN-I DCN-I ESCM (A,B,C,D)

ESCM (A,B,C,D)

MTP (A,B,C,D)

G QIAS-N G

ESCM (A,B,C,D)

CCG (A,B,C,D)

NPCS CCG Note : Signal paths important to safety are shown only.

DIS IPS I

System-Level MI System-Level MI APC-S: Auxiliary Process Cabinet - Safety CCG: Control Channel Gateway CIM: Component Interface Module CPCS: Core Protection Calculator System CPM: Control Panel Multiplexer DAS: Diverse Actuation System DIS: Diverse Indication System DCN-I: Data Communication Network-Information DMA: Diverse Manual ESF I : Isolator IFPD: Information Flat Panel Display IPS: Information Processing System ITP: Interface and Test Processor LC: Loop Controller LDP: Large Display Panel MCR: Main Control Room MI: Minimum Inventory MTP: Maintenance and Test Panel DPS: Diverse Protection System EDS: External Data Commnunication System ENFMS: Ex-core Neutron Flux Monitoring System EOF: Emergency Operation Facility ESCM: ESF-CCS Soft Control Module ESF-CCS: Engineered Safety Features - Component Control System FIDAS: Fixed In-core Detector Amplifier System G: Gateway GC: Group Controller MSIS: Main Steam Isolation System NDL: Nuclear Data Link NERC: Nuclear Emergency Response Center NPCS: NSSS Process Control System OM: Operator Module P-CCS: Process-Component Control System PCS: Power Control System PPS: Plant Protection System QIAS-P/N: Qualified Indication & Alarm System - P / Non-safety RCC: Remote Control Center RSR: Remote Shutdown Room RTSS: Reactor Trip Switchgear System Rx: Reactor SC: Safety Console SODP: Shutdown Overview Display Panel T/GCS: Turbine/Generator Control System TSC: Technical Support Center, Txs: Transmitter Legend 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(AF100))

Data Communication Network-I (DCN-I)

Serial Data Link (SDL(HSL))

Hardwired connection Diverse platform for DAS Ethernet LC P-CCS Component Switches RCC ESCM (A,B,C,D)

ESF-CCS LC Ethernet Hub EOF, NERC & NDL TSC IFPD EDS Server Figure 4-1 APR1400 I&C System Overview Architecture Non-Proprietary RAI 45-7883-Question 07.09-2_Rev.6 Attachment(5/21)

A

Safety I&C System APR1400-Z-J-NR-14001-NP, Rev.2 KEPCO & KHNP 115 Non-Proprietary 4.6.2.5 MTP to IPS Network The MTP to IPS network is used to provide data transmission to the IPS as shown in Figure 4-24. The data flow from the MTP to the IPS is unidirectional via a simplex fiber optic cable.

The communication between the MTP and IPS does not require any acknowledgment. A failure of this network does not prevent the RPS and ESFAS functions.

Figure 4-24 Data Communication from MTP to IPS 4.6.2.6 Communication of ESCM 4.6.2.7 Communication to External Interface SDN IPS Buffering Circuit CI : Communication interface card Electrical Isolation Unidirection MTP FOM FOM CI CC CC : Communication card (Ethernet)

Ethernet DCN-I Gateway Server DCS TS TS RAI 45-7883-Question 07.09-2_Rev.6 Attachment(6/21)

Safety I&C System APR1400-Z-J-NR-14001-NP, Rev.2 KEPCO & KHNP 116 Non-Proprietary Safety HSI System 4.7 4.7.1 Safety Control HSI TS TS RAI 45-7883-Question 07.09-2_Rev.6 Attachment(7/21)

Non-Proprietary RAI 45-7883-Question 07.09-2_Rev.6 Attachment(8/21)

Page intentionally blank RAI 45-7883-Question 07.09-2_Rev.5 RAI 45-7883-Question 07.09-2_Rev.6

Non-Proprietary RAI 45-7883-Question 07.09-2_Rev.6 Attachment(9/21)

Page intentionally blank

APR1400 DCD TIER 2 xix CSS containment spray system CVCS chemical and volume control system CWP CEA withdrawal prohibit DAS diverse actuation system DBE design basis event DC direct current DCD Design Control Document DCN-I data communication network-information DCS distributed control system DI digital input DIS diverse indication system DMA diverse manual ESF actuation DNBR departure from nucleate boiling ratio DO digital output DPS diverse protection system DRCS digital rod control system DVI direct vessel injection EDESS emergency diesel engine starting system EDG emergency diesel generator EMI electromagnetic interference ENFMS ex-core neutron flux monitoring system EOF emergency operations facility EOP emergency operating procedure EPRI Electric Power Research Institute ERDS emergency response data system ERF emergency response facility ESCM ESF-CCS soft control module ESF engineered safety features ESFAS engineered safety features actuation system ESF-CCS engineered safety features-component control system Rev. 2 RAI 45-7883-Question 07.09-2_Rev.6 Attachment(10/21)

EDS External Data communication system

APR1400 DCD TIER 2 xxii MTP maintenance and test panel NA not applicable NIMS NSSS integrity monitoring system NPCS NSSS process control system NRC Nuclear Regulatory Commission NSSS nuclear steam supply system OM operator module OSC operational support center P&ID piping and instrumentation diagram PA postulated accident PC personal computer P-CCS process-component control system PCS power control system PF penalty factor PLC programmable logic controller PLCS pressurizer level control system PM processor module POSRV pilot operated safety relief valve PPCS pressurizer pressure control system PPS plant protection system PRV process representative value PS processing section PSCEA part-strength CEA PZR pressurizer QA quality assurance QIAS qualified indication and alarm system QIAS-N qualified indication and alarm system - non-safety QIAS-P qualified indication and alarm system - P RAM random access memory RCC remote control center Rev. 2 RAI 45-7883-Question 07.09-2_Rev.6 Attachment(11/21)

NDL nuclear data link NERC nuclear emergency response center

APR1400 DCD TIER 2 7.1-43 MCR SC System Level Switches TO RO EO DIS Mini-LDP QIAS-N QIAS-P DIS SODP RTSS (A1,B1,C1,D1, A2,B2,C2,D2)

APC-S (A,B,C,D)

CIM (A,B,C,D)

Fission Chamber I

I I

Non-safety Components (Sensors, Txs, Pumps, Valves, etc.)

T/G Components ENFMS (A,B,C,D)

I ESF-CCS LC (A,B,C,D)

MSIS Act.

IFPD RSR IFPD IPS DIS QIAS-P QIAS-N QIAS-N QIAS-N T/GCS FIDAS P-CCS GC

/LC PCS I

QIAS-P (A,B)

DAS PPS (A,B,C,D)

ESF-CCS GC (A,B,C,D)

OM (A,B,C,D)

LDP ITP (A,B,C,D)

Rx Trip PPS Component-Level MI Incore Detector Safety-related Non-Safety Other Divisions DPS (N1,N2, N3,N4)

ESF-CCS GC Safety Components (Sensors, Txs, Pumps, Valves, etc.)

CIM RTSS DMA Rx Trip

`

CPCS (A,B,C,D)

CPM (A,B,C,D)

Rev.1 G

G G

Operating Bypass Setpoint Reset Rx Trip DMA ESF Act.

OM Operat.

Bypass Setpoint Reset RTSS CPM (A,B,C,D)

SDN SDN DCN-I DCN-I ESCM (A,B,C,D)

ESCM (A,B,C,D)

MTP (A,B,C,D)

G QIAS-N G

ESCM (A,B,C,D)

CCG (A,B,C,D)

NPCS CCG Note : Signal paths important to safety are shown only.

DIS IPS I

System-Level MI System-Level MI APC-S: Auxiliary Process Cabinet - Safety CCG: Control Channel Gateway CIM: Component Interface Module CPCS: Core Protection Calculator System CPM: Control Panel Multiplexer DAS: Diverse Actuation System DIS: Diverse Indication System DCN-I: Data Communication Network-Information DMA: Diverse Manual ESF I : Isolator IFPD: Information Flat Panel Display IPS: Information Processing System ITP: Interface and Test Processor LC: Loop Controller LDP: Large Display Panel MCR: Main Control Room MI: Minimum Inventory DPS: Diverse Protection System ENFMS: Ex-core Neutron Flux Monitoring System EOF: Emergency Operation Facility ERDS: Emergency Response Data System ESCM: ESF-CCS Soft Control Module ESF-CCS: Engineered Safety Features - Component Control System FIDAS: Fixed In-core Detector Amplifier System G: Gateway GC: Group Controller MTP: Maintenance and Test Panel NPCS: NSSS Process Control System MSIS: Main Steam Isolation System OM: Operator Module P-CCS: Process-Component Control System PCS: Power Control System PPS: Plant Protection System QIAS-P/N: Qualified Indication & Alarm System - P / Non-safety RCC: Remote Control Center RSR: Remote Shutdown Room RTSS: Reactor Trip Switchgear System Rx: Reactor SC: Safety Console SODP: Shutdown Overview Display Panel T/GCS: Turbine/Generator Control System TSC: Technical Support Center, Txs: Transmitter Legend 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(AF100))

Data Communication Network-I (DCN-I)

Serial Data Link (SDL(HSL))

Hardwired connection Diverse platform for DAS Ethernet LC P-CCS Component Switches RCC ESCM (A,B,C,D)

ESF-CCS LC VLAN Switches Firewall Ethernet Hub EOF & ERDS TSC IFPD Figure 7.1-1 APR1400 I&C System Overview Architecture Rev. 2 RAI 45-7883-Question 07.09-2_Rev.6 Attachment(12/21)

Replace C on the following page

MCR SC System Level Switches TO DIS Mini-LDP QIAS-N QIAS-P DIS SODP RTSS (A1,B1,C1,D1, A2,B2,C2,D2)

APC-S (A,B,C,D)

CIM (A,B,C,D)

Fission Chamber I

I I

Non-safety Components (Sensors, Txs, Pumps, Valves, etc.)

T/G Components ENFMS (A,B,C,D)

I ESF-CCS LC (A,B,C,D)

MSIS Act.

IFPD RSR IFPD IPS DIS QIAS-P QIAS-N QIAS-N QIAS-N T/GCS FIDAS P-CCS GC/LC PCS I

QIAS-P (A,B)

DAS PPS (A,B,C,D)

ESF-CCS GC (A,B,C,D)

OM (A,B,C,D)

LDP ITP (A,B,C,D)

Rx Trip PPS Component-Level MI Incore Detector Safety-related Non-Safety Other Divisions DPS (N1,N2, N3,N4)

ESF-CCS GC Safety Components (Sensors, Txs, Pumps, Valves, etc.)

CIM RTSS DMA Rx Trip

`

CPCS (A,B,C,D)

CPM (A,B,C,D)

Rev.2 G

G G

Operating Bypass Setpoint Reset Rx Trip DMA ESF Act.

OM Operat.

Bypass Setpoint Reset RTSS CPM (A,B,C,D)

SDN SDN DCN-I DCN-I ESCM (A,B,C,D)

ESCM (A,B,C,D)

MTP (A,B,C,D)

G QIAS-N G

ESCM (A,B,C,D)

CCG (A,B,C,D)

NPCS CCG Note : Signal paths important to safety are shown only.

DIS IPS I

System-Level MI System-Level MI APC-S: Auxiliary Process Cabinet - Safety CCG: Control Channel Gateway CIM: Component Interface Module CPCS: Core Protection Calculator System CPM: Control Panel Multiplexer DAS: Diverse Actuation System DIS: Diverse Indication System DCN-I: Data Communication Network-Information DMA: Diverse Manual ESF I : Isolator IFPD: Information Flat Panel Display IPS: Information Processing System ITP: Interface and Test Processor LC: Loop Controller LDP: Large Display Panel MCR: Main Control Room MI: Minimum Inventory MTP: Maintenance and Test Panel DPS: Diverse Protection System EDS: External Data Commnunication System ENFMS: Ex-core Neutron Flux Monitoring System EOF: Emergency Operation Facility ESCM: ESF-CCS Soft Control Module ESF-CCS: Engineered Safety Features - Component Control System FIDAS: Fixed In-core Detector Amplifier System G: Gateway GC: Group Controller MSIS: Main Steam Isolation System NDL: Nuclear Data Link NERC: Nuclear Emergency Response Center NPCS: NSSS Process Control System OM: Operator Module P-CCS: Process-Component Control System PCS: Power Control System PPS: Plant Protection System QIAS-P/N: Qualified Indication & Alarm System - P / Non-safety RCC: Remote Control Center RSR: Remote Shutdown Room RTSS: Reactor Trip Switchgear System Rx: Reactor SC: Safety Console SODP: Shutdown Overview Display Panel T/GCS: Turbine/Generator Control System TSC: Technical Support Center, Txs: Transmitter Legend 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(AF100))

Data Communication Network-I (DCN-I)

Serial Data Link (SDL(HSL))

Hardwired connection Diverse platform for DAS Ethernet LC P-CCS Component Switches RCC ESCM (A,B,C,D)

ESF-CCS LC Ethernet Hub EOF, NERC & NDL TSC IFPD EDS Server APR1400 DCD TIER 2 Figure 7.1-1 APR1400 I&C System Overview Architecture RAI 45-7883-Question 07.09-2_Rev.6 Attachment(13/21)

C

Diversity and Defense-in-Depth APR1400-Z-J-NR-14002-NP, Rev.2 KEPCO & KHNP xi Non-Proprietary D/G diesel generator DIS diverse indication system DMA diverse manual ESF actuation DPS diverse protection system DRCS digital rod control system DVI direct vessel injection EDG emergency diesel generator EEPROM Electrically Erasable Programmable Read-Only Memory EMC electromagnetic compatibility EMI electromagnetic interference ENFMS ex-core neutron flux monitoring system EOP emergency operating procedure ESCM ESF-CCS soft control module ESF engineered safety features ESFAS engineered safety features actuation system ESF-CCS engineered safety features - component control system FIDAS fixed in-core detector amplifier system FLC FPGA-based logic controller FPD flat panel display FPGA field programmable gate array FWCS feedwater control system GDC general design criteria GL generic letter GTG gas turbine generator HDL hardware description language HFE human factors engineering HJTC heated junction thermocouple HSI human-system interface I&C instrumentation and control ICC inadequate core cooling IEEE Institute of Electrical and Electronics Engineers IFPD information flat panel display IPS information processing system IRWST in-containment refueling water storage tank ITP interface and test processor RAI 45-7883-Question 07.09-2_Rev.6 Attachment(14/21)

EDS External Data communication system

Diversity and Defense-in-Depth APR1400-Z-J-NR-14002-NP, Rev.2 KEPCO & KHNP xii Non-Proprietary ITS important-to-safety KHNP Korea Hydro & Nuclear Power Co., Ltd.

LC loop controller LCL local coincidence logic LDP large display panel LOCA loss of coolant accident LOOP loss of offsite power M/A manual/auto MCR main control room MG Set motor generator set MI minimum inventory MS main steam MSIS main steam isolation signal MTP maintenance and test panel N/A not applicable NAPS nuclear application programs NIMS NSSS integrity monitoring system NPCS NSSS process control system NR narrow range NRC U.S. Nuclear Regulatory Commission NSSS Nuclear Steam Supply System OM operator module PA postulated accident P-CCS process - component control system PCS power control system PLC programmable logic controller PLCS pressurizer level control system POSRV pilot operated safety relief valve PPCS pressurizer pressure control system PPS plant protection system QIAS-N qualified indication and alarm system - non-safety QIAS-P qualified indication and alarm system - p RCP reactor coolant pump RCS reactor coolant system RFI radio frequency interference RAI 45-7883-Question 07.09-2_Rev.6 Attachment(15/21) nuclear data link nuclear emergency response center NERC NDL

Diversity and Defense-in-Depth APR1400-Z-J-NR-14002-NP, Rev.2 KEPCO & KHNP 10 Non-Proprietary Figure 4-1 Architecture Overview of the APR1400 I&C Systems MCR SC System Level Switches TO DIS Mini-LDP QIAS-N QIAS-P DIS SODP RTSS (A1,B1,C1,D1, A2,B2,C2,D2)

APC-S (A,B,C,D)

CIM (A,B,C,D)

Fission Chamber I

I I

Non-safety Components (Sensors, Txs, Pumps, Valves, etc.)

T/G Components ENFMS (A,B,C,D)

I ESF-CCS LC (A,B,C,D)

MSIS Act.

IFPD RSR IFPD IPS DIS QIAS-P QIAS-N QIAS-N QIAS-N T/GCS FIDAS P-CCS GC/LC PCS I

QIAS-P (A,B)

DAS PPS (A,B,C,D)

ESF-CCS GC (A,B,C,D)

OM (A,B,C,D)

LDP ITP (A,B,C,D)

Rx Trip PPS Component-Level MI Incore Detector Safety-related Non-Safety Other Divisions DPS (N1,N2, N3,N4)

ESF-CCS GC Safety Components (Sensors, Txs, Pumps, Valves, etc.)

CIM RTSS DMA Rx Trip

`

CPCS (A,B,C,D)

CPM (A,B,C,D)

Rev.1 G

G G

Operating Bypass Setpoint Reset Rx Trip DMA ESF Act.

OM Operat.

Bypass Setpoint Reset RTSS CPM (A,B,C,D)

SDN SDN DCN-I DCN-I ESCM (A,B,C,D)

ESCM (A,B,C,D)

MTP (A,B,C,D)

G QIAS-N G

ESCM (A,B,C,D)

CCG (A,B,C,D)

NPCS CCG Note : Signal paths important to safety are shown only.

DIS IPS I

System-Level MI System-Level MI APC-S: Auxiliary Process Cabinet - Safety CCG: Control Channel Gateway CIM: Component Interface Module CPCS: Core Protection Calculator System CPM: Control Panel Multiplexer DAS: Diverse Actuation System DIS: Diverse Indication System DCN-I: Data Communication Network-Information DMA: Diverse Manual ESF I : Isolator IFPD: Information Flat Panel Display IPS: Information Processing System ITP: Interface and Test Processor LC: Loop Controller LDP: Large Display Panel MCR: Main Control Room MI: Minimum Inventory DPS: Diverse Protection System ENFMS: Ex-core Neutron Flux Monitoring System EOF: Emergency Operation Facility ERDS: Emergency Response Data System ESCM: ESF-CCS Soft Control Module ESF-CCS: Engineered Safety Features - Component Control System FIDAS: Fixed In-core Detector Amplifier System G: Gateway GC: Group Controller MTP: Maintenance and Test Panel NPCS: NSSS Process Control System MSIS: Main Steam Isolation System OM: Operator Module P-CCS: Process-Component Control System PCS: Power Control System PPS: Plant Protection System QIAS-P/N: Qualified Indication & Alarm System - P / Non-safety RCC: Remote Control Center RSR: Remote Shutdown Room RTSS: Reactor Trip Switchgear System Rx: Reactor SC: Safety Console SODP: Shutdown Overview Display Panel T/GCS: Turbine/Generator Control System TSC: Technical Support Center, Txs: Transmitter Legend 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(AF100))

Data Communication Network-I (DCN-I)

Serial Data Link (SDL(HSL))

Hardwired connection Diverse platform for DAS Ethernet LC P-CCS Component Switches RCC ESCM (A,B,C,D)

ESF-CCS LC VLAN Switches Firewall Ethernet Hub EOF & ERDS TSC IFPD RAI 45-7883-Question 07.09-2_Rev.6 Attachment(16/21)

Replace with D on the following page

MCR SC System Level Switches TO DIS Mini-LDP QIAS-N QIAS-P DIS SODP RTSS (A1,B1,C1,D1, A2,B2,C2,D2)

APC-S (A,B,C,D)

CIM (A,B,C,D)

Fission Chamber I

I I

Non-safety Components (Sensors, Txs, Pumps, Valves, etc.)

T/G Components ENFMS (A,B,C,D)

I ESF-CCS LC (A,B,C,D)

MSIS Act.

IFPD RSR IFPD IPS DIS QIAS-P QIAS-N QIAS-N QIAS-N T/GCS FIDAS P-CCS GC/LC PCS I

QIAS-P (A,B)

DAS PPS (A,B,C,D)

ESF-CCS GC (A,B,C,D)

OM (A,B,C,D)

LDP ITP (A,B,C,D)

Rx Trip PPS Component-Level MI Incore Detector Safety-related Non-Safety Other Divisions DPS (N1,N2, N3,N4)

ESF-CCS GC Safety Components (Sensors, Txs, Pumps, Valves, etc.)

CIM RTSS DMA Rx Trip

`

CPCS (A,B,C,D)

CPM (A,B,C,D)

Rev.2 G

G G

Operating Bypass Setpoint Reset Rx Trip DMA ESF Act.

OM Operat.

Bypass Setpoint Reset RTSS CPM (A,B,C,D)

SDN SDN DCN-I DCN-I ESCM (A,B,C,D)

ESCM (A,B,C,D)

MTP (A,B,C,D)

G QIAS-N G

ESCM (A,B,C,D)

CCG (A,B,C,D)

NPCS CCG Note : Signal paths important to safety are shown only.

DIS IPS I

System-Level MI System-Level MI APC-S: Auxiliary Process Cabinet - Safety CCG: Control Channel Gateway CIM: Component Interface Module CPCS: Core Protection Calculator System CPM: Control Panel Multiplexer DAS: Diverse Actuation System DIS: Diverse Indication System DCN-I: Data Communication Network-Information DMA: Diverse Manual ESF I : Isolator IFPD: Information Flat Panel Display IPS: Information Processing System ITP: Interface and Test Processor LC: Loop Controller LDP: Large Display Panel MCR: Main Control Room MI: Minimum Inventory MTP: Maintenance and Test Panel DPS: Diverse Protection System EDS: External Data Commnunication System ENFMS: Ex-core Neutron Flux Monitoring System EOF: Emergency Operation Facility ESCM: ESF-CCS Soft Control Module ESF-CCS: Engineered Safety Features - Component Control System FIDAS: Fixed In-core Detector Amplifier System G: Gateway GC: Group Controller MSIS: Main Steam Isolation System NDL: Nuclear Data Link NERC: Nuclear Emergency Response Center NPCS: NSSS Process Control System OM: Operator Module P-CCS: Process-Component Control System PCS: Power Control System PPS: Plant Protection System QIAS-P/N: Qualified Indication & Alarm System - P / Non-safety RCC: Remote Control Center RSR: Remote Shutdown Room RTSS: Reactor Trip Switchgear System Rx: Reactor SC: Safety Console SODP: Shutdown Overview Display Panel T/GCS: Turbine/Generator Control System TSC: Technical Support Center, Txs: Transmitter Legend 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(AF100))

Data Communication Network-I (DCN-I)

Serial Data Link (SDL(HSL))

Hardwired connection Diverse platform for DAS Ethernet LC P-CCS Component Switches RCC ESCM (A,B,C,D)

ESF-CCS LC Ethernet Hub EOF, NERC & NDL TSC IFPD EDS Server Figure 4-1 Architecture Overview of the APR1400 I&C Systems Non-Proprietary RAI 45-7883-Question 07.09-2_Rev.6 Attachment(17/21)

D

CCF Coping Analysis APR1400-Z-A-NR-14019-NP, Rev.2 KEPCO & KHNP 5

Non-Proprietary Figure 4-1 Overview of APR1400 I&C System Architecture MCR SC System Level Switches TO DIS Mini-LDP QIAS-N QIAS-P DIS SODP RTSS (A1,B1,C1,D1, A2,B2,C2,D2)

APC-S (A,B,C,D)

CIM (A,B,C,D)

Fission Chamber I

I I

Non-safety Components (Sensors, Txs, Pumps, Valves, etc.)

T/G Components ENFMS (A,B,C,D)

I ESF-CCS LC (A,B,C,D)

MSIS Act.

IFPD RSR IFPD IPS DIS QIAS-P QIAS-N QIAS-N QIAS-N T/GCS FIDAS P-CCS GC/LC PCS I

QIAS-P (A,B)

DAS PPS (A,B,C,D)

ESF-CCS GC (A,B,C,D)

OM (A,B,C,D)

LDP ITP (A,B,C,D)

Rx Trip PPS Component-Level MI Incore Detector Safety-related Non-Safety Other Divisions DPS (N1,N2, N3,N4)

ESF-CCS GC Safety Components (Sensors, Txs, Pumps, Valves, etc.)

CIM RTSS DMA Rx Trip

`

CPCS (A,B,C,D)

CPM (A,B,C,D)

Rev.1 G

G G

Operating Bypass Setpoint Reset Rx Trip DMA ESF Act.

OM Operat.

Bypass Setpoint Reset RTSS CPM (A,B,C,D)

SDN SDN DCN-I DCN-I ESCM (A,B,C,D)

ESCM (A,B,C,D)

MTP (A,B,C,D)

G QIAS-N G

ESCM (A,B,C,D)

CCG (A,B,C,D)

NPCS CCG Note : Signal paths important to safety are shown only.

DIS IPS I

System-Level MI System-Level MI APC-S: Auxiliary Process Cabinet - Safety CCG: Control Channel Gateway CIM: Component Interface Module CPCS: Core Protection Calculator System CPM: Control Panel Multiplexer DAS: Diverse Actuation System DIS: Diverse Indication System DCN-I: Data Communication Network-Information DMA: Diverse Manual ESF I : Isolator IFPD: Information Flat Panel Display IPS: Information Processing System ITP: Interface and Test Processor LC: Loop Controller LDP: Large Display Panel MCR: Main Control Room MI: Minimum Inventory DPS: Diverse Protection System ENFMS: Ex-core Neutron Flux Monitoring System EOF: Emergency Operation Facility ERDS: Emergency Response Data System ESCM: ESF-CCS Soft Control Module ESF-CCS: Engineered Safety Features - Component Control System FIDAS: Fixed In-core Detector Amplifier System G: Gateway GC: Group Controller MTP: Maintenance and Test Panel NPCS: NSSS Process Control System MSIS: Main Steam Isolation System OM: Operator Module P-CCS: Process-Component Control System PCS: Power Control System PPS: Plant Protection System QIAS-P/N: Qualified Indication & Alarm System - P / Non-safety RCC: Remote Control Center RSR: Remote Shutdown Room RTSS: Reactor Trip Switchgear System Rx: Reactor SC: Safety Console SODP: Shutdown Overview Display Panel T/GCS: Turbine/Generator Control System TSC: Technical Support Center, Txs: Transmitter Legend 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(AF100))

Data Communication Network-I (DCN-I)

Serial Data Link (SDL(HSL))

Hardwired connection Diverse platform for DAS Ethernet LC P-CCS Component Switches RCC ESCM (A,B,C,D)

ESF-CCS LC VLAN Switches Firewall Ethernet Hub EOF & ERDS TSC IFPD RAI 45-7883-Question 07.09-2_Rev.6 Attachment(18/21)

Replace E on the following page

MCR SC System Level Switches TO DIS Mini-LDP QIAS-N QIAS-P DIS SODP RTSS (A1,B1,C1,D1, A2,B2,C2,D2)

APC-S (A,B,C,D)

CIM (A,B,C,D)

Fission Chamber I

I I

Non-safety Components (Sensors, Txs, Pumps, Valves, etc.)

T/G Components ENFMS (A,B,C,D)

I ESF-CCS LC (A,B,C,D)

MSIS Act.

IFPD RSR IFPD IPS DIS QIAS-P QIAS-N QIAS-N QIAS-N T/GCS FIDAS P-CCS GC/LC PCS I

QIAS-P (A,B)

DAS PPS (A,B,C,D)

ESF-CCS GC (A,B,C,D)

OM (A,B,C,D)

LDP ITP (A,B,C,D)

Rx Trip PPS Component-Level MI Incore Detector Safety-related Non-Safety Other Divisions DPS (N1,N2, N3,N4)

ESF-CCS GC Safety Components (Sensors, Txs, Pumps, Valves, etc.)

CIM RTSS DMA Rx Trip

`

CPCS (A,B,C,D)

CPM (A,B,C,D)

Rev.2 G

G G

Operating Bypass Setpoint Reset Rx Trip DMA ESF Act.

OM Operat.

Bypass Setpoint Reset RTSS CPM (A,B,C,D)

SDN SDN DCN-I DCN-I ESCM (A,B,C,D)

ESCM (A,B,C,D)

MTP (A,B,C,D)

G QIAS-N G

ESCM (A,B,C,D)

CCG (A,B,C,D)

NPCS CCG Note : Signal paths important to safety are shown only.

DIS IPS I

System-Level MI System-Level MI APC-S: Auxiliary Process Cabinet - Safety CCG: Control Channel Gateway CIM: Component Interface Module CPCS: Core Protection Calculator System CPM: Control Panel Multiplexer DAS: Diverse Actuation System DIS: Diverse Indication System DCN-I: Data Communication Network-Information DMA: Diverse Manual ESF I : Isolator IFPD: Information Flat Panel Display IPS: Information Processing System ITP: Interface and Test Processor LC: Loop Controller LDP: Large Display Panel MCR: Main Control Room MI: Minimum Inventory MTP: Maintenance and Test Panel DPS: Diverse Protection System EDS: External Data Commnunication System ENFMS: Ex-core Neutron Flux Monitoring System EOF: Emergency Operation Facility ESCM: ESF-CCS Soft Control Module ESF-CCS: Engineered Safety Features - Component Control System FIDAS: Fixed In-core Detector Amplifier System G: Gateway GC: Group Controller MSIS: Main Steam Isolation System NDL: Nuclear Data Link NERC: Nuclear Emergency Response Center NPCS: NSSS Process Control System OM: Operator Module P-CCS: Process-Component Control System PCS: Power Control System PPS: Plant Protection System QIAS-P/N: Qualified Indication & Alarm System - P / Non-safety RCC: Remote Control Center RSR: Remote Shutdown Room RTSS: Reactor Trip Switchgear System Rx: Reactor SC: Safety Console SODP: Shutdown Overview Display Panel T/GCS: Turbine/Generator Control System TSC: Technical Support Center, Txs: Transmitter Legend 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(AF100))

Data Communication Network-I (DCN-I)

Serial Data Link (SDL(HSL))

Hardwired connection Diverse platform for DAS Ethernet LC P-CCS Component Switches RCC ESCM (A,B,C,D)

ESF-CCS LC Ethernet Hub EOF, NERC & NDL TSC IFPD EDS Server Non-Proprietary Figure 4-1 Overview of APR1400 I&C System Architecture RAI 45-7883-Question 07.09-2_Rev.6 Attachment(19/21)

E

Control System CCF Analysis APR1400-Z-J-NR-14012-NP, Rev.2 KEPCO & KHNP 13 Non-Proprietary Figure 4.1-1 Credible Failure Boundary of Control System CCF MCR SC System Level Switches TO RO EO DIS Mini-LDP QIAS-N QIAS-P DIS SODP RTSS (A1,B1,C1,D1, A2,B2,C2,D2)

APC-S (A,B,C,D)

CIM (A,B,C,D)

Fission Chamber I

I I

Non-safety Components (Sensors, Txs, Pumps, Valves, etc.)

T/G Components ENFMS (A,B,C,D)

I ESF-CCS LC (A,B,C,D)

MSIS Act.

IFPD RSR IFPD IPS DIS QIAS-P QIAS-N QIAS-N QIAS-N T/GCS FIDAS P-CCS GC/LC PCS I

QIAS-P (A,B)

DAS PPS (A,B,C,D)

ESF-CCS GC (A,B,C,D)

OM (A,B,C,D)

LDP ITP (A,B,C,D)

Rx Trip PPS Component-Level MI Incore Detector Safety-related Non-Safety Other Divisions DPS (N1,N2, N3,N4)

ESF-CCS GC Safety Components (Sensors, Txs, Pumps, Valves, etc.)

CIM RTSS DMA Rx Trip

`

CPCS (A,B,C,D)

CPM (A,B,C,D)

Rev.1 G

G G

Operating Bypass Setpoint Reset Rx Trip DMA ESF Act.

OM Operat.

Bypass Setpoint Reset RTSS CPM (A,B,C,D)

SDN SDN DCN-I DCN-I ESCM (A,B,C,D)

ESCM (A,B,C,D)

MTP (A,B,C,D)

G QIAS-N G

ESCM (A,B,C,D)

CCG (A,B,C,D)

NPCS CCG Note : Signal paths important to safety are shown only.

DIS IPS I

System-Level MI APC-S: Auxiliary Process Cabinet - Safety CCG: Control Channel Gateway CIM: Component Interface Module CPCS: Core Protection Calculator System CPM: Control Panel Multiplexer DAS: Diverse Actuation System DIS: Diverse Indication System DCN-I: Data Communication Network-Information DMA: Diverse Manual ESF I : Isolator IFPD: Information Flat Panel Display IPS: Information Processing System ITP: Interface and Test Processor LC: Loop Controller LDP: Large Display Panel MCR: Main Control Room MI: Minimum Inventory DPS: Diverse Protection System ENFMS: Ex-core Neutron Flux Monitoring System EOF: Emergency Operation Facility ERDS: Emergency Response Data System ESCM: ESF-CCS Soft Control Module ESF-CCS: Engineered Safety Features - Component Control System FIDAS: Fixed In-core Detector Amplifier System G: Gateway GC: Group Controller MTP: Maintenance and Test Panel NPCS: NSSS Process Control System MSIS: Main Steam Isolation System OM: Operator Module P-CCS: Process-Component Control System PCS: Power Control System PPS: Plant Protection System QIAS-P/N: Qualified Indication & Alarm System - P / Non-safety RCC: Remote Control Center RSR: Remote Shutdown Room RTSS: Reactor Trip Switchgear System Rx: Reactor SC: Safety Console SODP: Shutdown Overview Display Panel T/GCS: Turbine/Generator Control System TSC: Technical Support Center, Txs: Transmitter Legend 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(AF100))

Data Communication Network-I (DCN-I)

Serial Data Link (SDL(HSL))

Hardwired connection Diverse platform for DAS Ethernet LC P-CCS Component Switches RCC ESCM (A,B,C,D)

ESF-CCS LC VLAN Switches Firewall Ethernet Hub EOF & ERDS TSC IFPD TS TS RAI 45-7883-Question 07.09-2_Rev.6 Attachment(20/21)

Replace F on the following page

MCR SC System Level Switches TO DIS Mini-LDP QIAS-N QIAS-P DIS SODP RTSS (A1,B1,C1,D1, A2,B2,C2,D2)

APC-S (A,B,C,D)

CIM (A,B,C,D)

Fission Chamber I

I I

Non-safety Components (Sensors, Txs, Pumps, Valves, etc.)

T/G Components ENFMS (A,B,C,D)

I ESF-CCS LC (A,B,C,D)

MSIS Act.

IFPD RSR IFPD IPS DIS QIAS-P QIAS-N QIAS-N QIAS-N T/GCS FIDAS P-CCS GC/LC PCS I

QIAS-P (A,B)

DAS PPS (A,B,C,D)

ESF-CCS GC (A,B,C,D)

OM (A,B,C,D)

LDP ITP (A,B,C,D)

Rx Trip PPS Component-Level MI Incore Detector Safety-related Non-Safety Other Divisions DPS (N1,N2, N3,N4)

ESF-CCS GC Safety Components (Sensors, Txs, Pumps, Valves, etc.)

CIM RTSS DMA Rx Trip

`

CPCS (A,B,C,D)

CPM (A,B,C,D)

Rev.2 G

G G

Operating Bypass Setpoint Reset Rx Trip DMA ESF Act.

OM Operat.

Bypass Setpoint Reset RTSS CPM (A,B,C,D)

SDN SDN DCN-I DCN-I ESCM (A,B,C,D)

ESCM (A,B,C,D)

MTP (A,B,C,D)

G QIAS-N G

ESCM (A,B,C,D)

CCG (A,B,C,D)

NPCS CCG Note : Signal paths important to safety are shown only.

DIS IPS I

System-Level MI System-Level MI APC-S: Auxiliary Process Cabinet - Safety CCG: Control Channel Gateway CIM: Component Interface Module CPCS: Core Protection Calculator System CPM: Control Panel Multiplexer DAS: Diverse Actuation System DIS: Diverse Indication System DCN-I: Data Communication Network-Information DMA: Diverse Manual ESF I : Isolator IFPD: Information Flat Panel Display IPS: Information Processing System ITP: Interface and Test Processor LC: Loop Controller LDP: Large Display Panel MCR: Main Control Room MI: Minimum Inventory MTP: Maintenance and Test Panel DPS: Diverse Protection System EDS: External Data Commnunication System ENFMS: Ex-core Neutron Flux Monitoring System EOF: Emergency Operation Facility ESCM: ESF-CCS Soft Control Module ESF-CCS: Engineered Safety Features - Component Control System FIDAS: Fixed In-core Detector Amplifier System G: Gateway GC: Group Controller MSIS: Main Steam Isolation System NDL: Nuclear Data Link NERC: Nuclear Emergency Response Center NPCS: NSSS Process Control System OM: Operator Module P-CCS: Process-Component Control System PCS: Power Control System PPS: Plant Protection System QIAS-P/N: Qualified Indication & Alarm System - P / Non-safety RCC: Remote Control Center RSR: Remote Shutdown Room RTSS: Reactor Trip Switchgear System Rx: Reactor SC: Safety Console SODP: Shutdown Overview Display Panel T/GCS: Turbine/Generator Control System TSC: Technical Support Center, Txs: Transmitter Legend 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(AF100))

Data Communication Network-I (DCN-I)

Serial Data Link (SDL(HSL))

Hardwired connection Diverse platform for DAS Ethernet LC P-CCS Component Switches RCC ESCM (A,B,C,D)

ESF-CCS LC Ethernet Hub EOF, NERC & NDL TSC IFPD EDS Server Non-Proprietary Figure 4.1-1 Credible Failure Boundary of Control System CCF RAI 45-7883-Question 07.09-2_Rev.6 Attachment(21/21)

F