ML19011A212

Revision 4 to Defueled Safety Analysis Report, Chapter 7, Instrumentation and Controls

ML19011A212
Person / Time
Site:	San Onofre
Issue date:	12/06/2018
From:	Southern California Edison Co
To:	Office of Nuclear Reactor Regulation
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San Onofre 2&3 UFSAR (DSAR)

INSTRUMENTATION AND CONTROLS

7. INSTRUMENTATION AND CONTROLS

7.1 INTRODUCTION

Not all subsystems of the Instrumentation and Control Systems are required to support permanent plant shutdown or defueled operations. The status of these subsystems is listed in the table below. Design Basis, Licensing Basis, and operational information in this chapter has been updated to reflect the current status. Although the subsystems removed or partially removed from service no longer support operation, they may still contain fluids, gases or other hazards such as energized circuits, compressed air, radioactive material, etc. Equipment may not have been physically removed from the plant. See General Arrangement Drawings, P&IDs, One-Line diagrams for the current plant configuration.

STRUCTURES/SYSTEMS/COMPONENTS STATUS Plant Protection System (PPS) Removed from Service Engineered Safety Feature (ESF) System Removed from Service Auxiliary Supporting Systems Removed from Service Systems Required for Safe Shutdown Removed from Service Safety-Related Display Instrumentation Removed from Service All Other Systems Required for Safety Removed from Service Control Systems Not Required for Safety Partially Removed from Service 7.1.1 IDENTIFICATION OF SAFETY RELATED SYSTEMS The instrumentation and controls systems removed from service are identified below.

7.1.1.1 Plant Protection System (PPS)

The PPS systems removed from service are:

STRUCTURES/SYSTEMS/COMPONENTS STATUS Reactor Protective System (RPS) (NSSS) Removed from Service Engineered Safety Features (ESF) Actuation System Removed from Service November 2018 7-1 Rev 4

San Onofre 2&3 UFSAR (DSAR)

INSTRUMENTATION AND CONTROLS 7.1.1.2 Engineered Safety Feature (ESF) Systems The ESF systems removed from service are:

STRUCTURES/SYSTEMS/COMPONENTS STATUS Safety Injection (SIAS) Removed from Service Containment Emergency Sump Recirculation (RAS) Removed from Service Containment Spray (CSAS) Removed from Service Containment Isolation (CIAS) Removed from Service Containment Purge Isolation (CPIS) Removed from Service Main Steam Isolation (MSIS) Removed from Service Auxiliary Feedwater (EFAS) Removed from Service Containment Cooling (CCAS) Removed from Service Control Room Isolation (CRIS) Removed from Service Toxic Gas Isolation (TGIS) Removed from Service 7.1.1.3 Auxiliary Supporting Systems The auxiliary supporting systems removed from service are:

STRUCTURES/SYSTEMS/COMPONENTS STATUS Salt Water-Cooling System Removed from Service Component Cooling Water System Removed from Service Diesel Generator System Removed from Service Emergency Chilled Water System Removed from Service Heating, Ventilating and Air Conditioning (HVAC) Systems Removed from Service Onsite Power System Available (See Chapter 8)

November 2018 7-2 Rev 4

San Onofre 2&3 UFSAR (DSAR)

INSTRUMENTATION AND CONTROLS 7.1.1.4 Systems Required for Safe Shutdown The required for safe shutdown systems removed from service are:

STRUCTURES/SYSTEMS/COMPONENTS STATUS Auxiliary Feedwater System (Non-NSSS) Removed from Service Atmospheric Steam Dump System (Non-NSSS) Removed from Service Shutdown Cooling System (NSSS) Removed from Service Chemical And Volume Control System (Charging And Boric Acid Removed from Service Makeup Portion) (NSSS)

Reactor Coolant System (NSSS) Removed from Service Main Steam System Integrity Up To And Including Main Steam Removed from Service Isolation Valves (MSIVs) (NSSS)

Reactor Protection System (RPS) (Reactor Trip Manual Pushbuttons In Removed from Service Control Room, Reactor Trip Actuation Circuitry Downstream Of Manual Pushbuttons, And Reactor Trip Breakers (RTBS) Only) (NSSS)

Containment Emergency Cooling Removed from Service 7.1.1.5 Safety-Related Display Instrumentation The safety-related displays removed from service are:

STRUCTURES/SYSTEMS/COMPONENTS STATUS Reactor Protective System Removed from Service Engineered Safety Features Systems Removed from Service Auxiliary Support Systems Removed from Service Plant Process Instrumentation Removed from Service Bypass And Inoperable Status Indication Removed from Service Post-Accident Monitoring Instrumentation Removed from Service Control Element Assembly (CEA) Position Removed from Service Remote Shutdown Panel Instrumentation Removed from Service Pressurizer Safety Valve Position Indication Removed from Service Instrumentation For Detection Of Inadequate Core Cooling Removed from Service November 2018 7-3 Rev 4

San Onofre 2&3 UFSAR (DSAR)

INSTRUMENTATION AND CONTROLS 7.1.1.6 All Other Systems Required for Safety The status of all other systems required for safety is listed below.

STRUCTURES/SYSTEMS/COMPONENTS STATUS Shutdown Cooling Interlocks Removed from Service Safety Injection Tank Isolation Valve Interlocks Removed from Service Critical Function Monitoring System (CFMS) Removed from Service Dose Assessment Computer System Removed from Service CFMS Historical Data Storage And Retrieval Removed from Service Draindown Reactor Water Level Indication Removed from Service Fuel Handling Interlocks Available (See Chapter 9 Anticipated Transient Without Scram/Diverse Scram System Removed from Service (ATWS/DSS)

Anticipated Transient Without Scram/Diverse Emergency Feedwater Removed from Service Actuation System (ATWS/EFAS)

Data Acquisition System (DAS) Removed from Service 7.1.1.7 Control Systems Not Required for Safety The status of control and instrumentation systems is listed below:

STRUCTURES/SYSTEMS/COMPONENTS STATUS Reactivity Control - CEA Control Removed from Service Reactivity Control - Boron Control Removed from Service Pressurizer Control - Pressure Control Removed from Service Pressurizer Control - Level Control Removed from Service Feedwater Control Removed from Service Steam Flow Control - Steam Bypass Control Removed from Service Steam Flow Control - Main Turbine Control Removed from Service Core Operating Limits Surveillance System (COLSS) Removed from Service Plant Monitoring System Removed from Service In-core Instrumentation System Removed from Service Ionization Chambers Removed from Service Essential Plant Parameter Monitoring System Removed from Service Tank Data Acquisition System Removed from Service Command Center Data Acquisition System (CDAS) Available November 2018 7-4 Rev 4

San Onofre 2&3 UFSAR (DSAR)

INSTRUMENTATION AND CONTROLS 7.2 INSTRUMENTATION SYSTEMS NOT REQUIRED FOR SAFETY 7.2.1 COMMAND CENTER DATA ACQUISITION SYSTEM (CDAS) 7.2.1.1 Overview The CDAS is a non-safety related, Quality Class III, Seismic Category II system. The CDAS is a digital based system that provides required indications and alarms . CDAS is a monitoring only system and has no control functions. CDAS utilizes the R-Time software platform.

7.2.1.2 General Functional Conditions 7.2.1.2.1 Users The CDAS provides required indication and alarm information to Control Room/Command Center Operators. The Human Machine Interface (HMI) displays are located as follows:

• One at the Unit 2 Control Operator's Console 2CR-55

• One at the Unit 3 Control Operator's Console 3CR-55

• One at the Common Control Operator's Console 2/3CR-66 Annunciator functions are provided by speakers connected to each Personal Computer based workstation, which provide simultaneous annunciation. Acknowledgement, clearing or resetting of alarms can be done at each of the Operator workstations.

7.2.1.2.2 Data Acquisition The CDAS collects data from the following SSCs:

• ISFSI I North Industrial Area (NIA)

• ISFSI Outlet Temperature monitoring

• NIA Liquid Effluent Radiation Monitor 2/3RE2101

• NIA Sump Level Monitoring

• Meteorological (MET)

• Wind Speed and Direction

• Temperature and Temperature Differential

• Turbulence (Sigma)

• Precipitation

• Unit 2 and 3 800 MHz Communication Rectifier

• Overall System Health and Status

• Radiation Monitors

• Gaseous Effluent Monitor (Plant Vent Stack)

• Total Vent Flow rate

• Effluent radiation levels

• Area Monitors; 2/3RE7851, 2(3)RE7850 November 2018 7-5 Rev 4

San Onofre 2&3 UFSAR (DSAR)

INSTRUMENTATION AND CONTROLS

• Liquid Effluent Monitors; 2RE7821, 2/3RE7813

• U2 and U3 Spent Fuel Pool

• High and Low Levels

• High Temperature

• Firewater System

• Pump Status: 2/3P220, P221, P222

• Water Tank (Tl02 and TI03) Level

• Header Pressure

• U2 and U3 Salt Water Dilution Pumps

• Pump Flow

• Chemical Waste Tank

• Tank Level November 2018 7-6 Rev 4