ML19158A479

2019 Handouts Color 8 5x11

ML19158A479
Person / Time
Issue date:	06/07/2019
From:	Office of Nuclear Regulatory Research
To:
T. Rivera 415-2376
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ML19158A477	List: ML19158A478 ML19158A479 ML19158A480 ML19158A481
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Download: ML19158A479 (19)

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INDEX Electrical Basics Drawing Samples Basics 1 Overall Plant 1-Line Basics 2 7.2 kV Bus 1-Line Basics 3 4.16 kV Bus 1-Line Basics 4 600 V 1-Line Basics 5 480 V MCC 1-Line Basics 6 7.2 kV 3-Line Diagram Basics 7 4.16 kV 3-Line Diagram Basics 8 AOV Elementary & Block Diagram Basics 9 4.16 kV Pump Schematic Basics 10 480 V Pump Schematic Basics 11 MOV Schematic (with Block included)

Basics 12 12-/208 VAC Panel Diagram Basics 13 Valve Limit Switch Legend Basics 14 AOV Schematic (with Block included)

Basics 15 Wiring (or Connection) Diagram Basics 16 Wiring (or Connection) Diagram Basics 17 Tray & Conduit Layout Drawing Basics 18 Embedded Conduit Drawing Basics 19 Instrument Loop Diagram

INDEX Handout References Reference 1 Index for Handouts & Basic Drawings Reference 2 Electrical Drawing Symbols Reference 3 IEEE Device Numbers Reference 4 Circuit Analysis Worksheet Template Reference 5 Example Problems Electrical 1-Line Diagram Reference 6 Schematic & Device Legend Reference 7 SOV Schematic Diagram Example Reference 8 MOV Schematic Diagram Example Reference 9 Breaker Schematic Diagram Example Reference 10 Task 3 / 9A Recommended Process Cheat Sheet Reference 11 List of Circuit Analysis Exercises

TYPICAL ELECTRICAL DRAWING SYMBOLS AND CONVENTIONS ELECTRICAL SYMBOLS Denotes common symbols we will encounter in the sample problems 1

2 (Motor Operated Valves) 3

4 5

INDICATORS & ALARMS RELAYS 6

ELEMENTARY DIAGRAM CONNECTIONS WIRE NUMBERING Understanding these general conventions will greatly help with understanding of how to work with schematic (elementary) diagrams 7

8 ABBREVIATIONS 9

ANSI/IEEE Standard Device Numbers 1 - Master Element 39 - Mechanical Condition Monitor 2 - Time delay Starting or Closing Relay 40 - Field (over/under excitation) Relay 3 - Checking or Interlocking Relay 41 - Field Circuit Breaker 4 - Master Contactor 42 - Running Circuit Breaker 5 - Stopping 43 - Manual Transfer or Selector Device 6 - Starting Circuit Breaker 44 - Unit Sequence Starting Relay 7 - Rate of Change Relay 45 - DC over voltage Relay 8 - Control Power Disconnecting Device 46 - Reverse-phase or Phase-Balance Current Relay 9 - Reversing Device 47 - Phase-Sequence or Phase-Balance Voltage Relay 10 - Unit Sequence Switch 48 - Incomplete Sequence Relay 11 - Multi-function Device 49 - Machine or Transformer, Thermal Relay - OLR 12 - Overspeed Device 50 - Instantaneous Overcurrent Relay 13 - Synchronous-speed Device 50G - Instantaneous Earth Overcurrent Relay (Neutral CT Method) 14 - Underspeed Device 50N - Instantaneous Earth Overcurrent Relay (Residual Method) 15 - Speed - or Frequency, Matching Device 50BF - Breaker failure 16 - Data Communications Device 51 - AC Inverse Time Overcurrent Relay 17 - Shunting or Discharge Switch 51G - AC Inverse Time Earth Overcurrent Relay (Neutral CT Method) 18 - Accelerating or Decelerating Device 51N - AC Inverse Time Earth Overcurrent Relay (Residual Method) 19 - Starting to Running Transition Contractor 52 - AC Circuit Breaker 20 - Electrically Operated Valve 52a - AC Circuit Breaker Position (Contact Open when Breaker Open) 21 - Distance Relay 52b - AC Circuit Breaker Position (Contact Closed when Breaker Open) 22 - Equalizer Circuit Breaker 53 - Exciter or DC Generator Relay 23 - Temperature Control Device 54 - Turning Gear Engaging Device 24 - Volts per Hertz Relay 55 - Power Factor Relay 25 - Synchronizing or Synchronize-Check Device 56 - Field Application Relay 26 - Apparatus Thermal Device 57 - Short-Circuiting or Grounding Device 27 - Undervoltage Relay 58 - Rectification Failure Relay 27s - DC under voltage Relay 59 - Overvoltage Relay 28 - Flame detector 60 - Voltage or Current Balance Relay.

29 - Isolating Contactor or Switch 61 - Density Switch or Sensor 30 - Annunciator Relay 62 - Time-Delay Stopping or Opening Relay 31 - Separate Excitation 63 - Pressure Switch 32 - Directional Power Relay or Reverse Power Relay 64 - Ground Detector Relay 33 - Position Switch 64R - Restricted earth fault 34 - Master Sequence Device 64S - Stator earth fault 35 - Brush-Operating or Slip-Ring Short-Circuiting Dev 65 - Governor 36 - Polarity or Polarizing Voltage Devices 66 - Notching or Jogging Device 37 - Undercurrent or Underpower Relay 67 - AC Directional Overcurrent Relay 38 - Bearing Protective Device 68 - Blocking Relay Page 1

ANSI/IEEE Standard Device Numbers 69 - Permissive Control Device 95 - For specific applications where other numbers are not suitable 70 - Rheostat 96 - Busbar Trip Lockout relay 71 - Liquid Level Switch 97 - Specific applications where other numbers are not suitable 72 - DC Circuit Breaker 98 - Specific applications where other numbers are not suitable 73 - Load-Resistor Contactor 99 - Specific applications where other numbers are not suitable 74 - Alarm Relay 150 - Earth Fault Indicator 75 - Position Changing Mechanism AFD - Arc Flash Detector 76 - DC Overcurrent Relay CLK - Clock or Timing Source 77 - Telemetering Device DDR - Dynamic Disturbance Recorder 78 - Phase-Angle Measure Relay or "Out-of-Step" Relay DFR - Digital Fault Recorder 79 - AC Reclosing Relay (Auto Reclosing) DME - Disturbance Monitor Equipment 80 - Flow Switch HIZ - High Impedance Fault Detector 81 - Frequency Relay HMI - Human Machine Interface 82 - DC Reclosing Relay HST - Historian 83 - Automatic Selective Control or Transfer Relay LGC - Scheme Logic 84 - Operating Mechanism MET - Substation Metering 85 - Communications, Carrier, or Pilot-Wire Relay PDC - Phasor Data Concentrator 86 - Lockout Relay/Master Trip PMU - Phasor Measurement Unit 87 - Differential Protective Relay PQM - Power Quality Monitor 88 - Auxiliary Motor or Motor Generator RIO - Remote Input/Output Device 89 - Line Switch RTU - Remote Terminal Unit/Data Concentrator 90 - Regulating Device SER - Sequence of Events Recorder 91 - Voltage Directional Relay TCM - Trip Circuit Monitor 92 - Voltage and Power Directional Relay LRSS - LOCAL/REMOTE SELECTOR SWITCH 93 - Field Changing Contactor SOTF - Switch On To Fault 94 - Tripping or Trip-Free Relay (trip circuit supervision Relay)

DEVICE SUFFIX NUMBERS A suffix letter or number may be used with the device number; for example, suffix N is used if the device is connected to a Neutral wire (example: 59N in a relay is used for protection against Neutral Displacement); and suffixes X,Y,Z are used for auxiliary devices.

Similarly, the "G" suffix can denote a "ground", hence a "51G" is a time overcurrent ground relay. The "G" suffix can also mean "generator", hence an "87G" is a Generator Differential Protective Relay while an "87T" is a Transformer Differential Protective Relay. "F" can denote "field" on a generator or "fuse", as in the protective fuse for a pickup transformer. Suffix numbers are used to distinguish multiple "same" devices in the same equipment such as 51-1, 51-2.

Common suffixes: B - Bus G - Ground or Generator F - Field N - Neutral T - Transformer Device numbers may be combined if the device provides multiple functions, such as the instantaneous/time-delay AC over current relay denoted as 50/51.

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CIRCUIT ANALYSIS WORKSHEET Component ID Component Type Component Description Normal Position Failed Electrical Position Failed Air Position Function State Initial Position Desired Position BE Code High Consequence Component Yes No Power Supplies Breaker Reqd Breaker Reqd Cable Analysis Cable ID Reqd? MHS? Fault Consequence Comments

Cable ID Reqd? MHS? Fault Consequence Comments Equipment Dependencies Comments Cable Analysis Failure Mode(s)

Grounded?

Single Aggregate or Power Double Circuit (AC or Insulation Intra Inter GFEHS Cable ID Break Type DC) / Shield 7150 Table P(x)

Cable Selection /Circuit Analysis Recommended Process for Task 3 & Task 9A Preparation

1. Collect Drawings

2. Understand functional state requirements of the circuit

3. Decide on:

Active functional state - Power is required to meet function state requirements or Passive functional state - Power is not required to meet function state requirements Power Supply

4. Identify power supply and breaker/fuse for the circuit

5. Is power required to achieve/maintain functional state?

6. Determine requirement for Alternate power (if applicable)

Contact Positions / Cable-Conductor Markup

7. Mark up contact positions on drawings for Initial condition or state (Dont guess, use limit switch legends and switch developments)

8. Highlight schematic (elementary) & block diagrams to show cable - conductor relationship Hot-Probe Assessment

9. Using Hot-Probe and Ground-Probe technique, identify failure mode(s) for each conductor NOTE: Remember that this technique for Task 3/9A assumes a source conductor is present and does not distinguish between intra-cable and inter-cable hot short

10. Assign Fault Codes to the conductors

11. Roll up conductor failure modes to cable(s)

Off-Scheme Circuits / Dependencies

12. Assess each control contact from off-scheme circuits (auxiliary contacts) to decide if it can impact the function state:

Is contact needed for proper operation of a credited automatic function

Cable Selection /Circuit Analysis Recommended Process for Task 3 & Task 9A Could contact prevent automatic or manual operation Could contact by itself (or in conjunction with another circuit failure) cause a spurious operation

13. If contact could affect function state, then an Equipment Dependency exists with the contacts circuit.

Document Analysis

14. Document analysis per established process

15. File all markup drawings and notes in component work package (Current Best Practice is create electronic work package)

16. Generate failure reports as required to support PRA quantification Fault Codes Primary Circuit Failure Mode Descriptions Causal Modifiers EI Erroneous Indication BF Blown Fuse EIS Erroneous Indicating Signal HS Hot Short LIS Loss of Indicating Signal PR Protective Relay LOC Loss of Control SG Short to Ground LOCP Loss of Control Power (usually applies only to metalclad switchgear that depend on a separate control power source to actuate)

LOI Loss of Indication LOP Loss of Power (to the circuit)

SA Spuriously Actuates or Spurious Actuation Example Usage:

SC Spuriously Closes LOP-BF: Loss of power due to a blown fuse SO Spuriously Opens SO-HS: Spuriously opens due to a hot short SS Spuriously Starts/Runs LOC-PR: Loss of control due to a protective relay

List of Circuit Analysis Exercises (2019 Course)

Example Component Description of Example Function State No.

1A Easy AOV circuit with function states involving change of Open - Closed AOV-8879B position and maintain energized position 1B [Walkthrough Example] Open - Open 2A Closed - Open Medium MOV circuit with interlock dependencies; 2B MOV-8112-A various function states investigated Closed - Closed

[Walkthrough Example]

2C Open - Closed 3A Open - Open Easy MOV circuit with function states involving change MOV-8888 of position and maintain initial position 3B Open - Closed 4A Closed - Closed Medium difficulty AOV circuit with function states AOV-2869A involving change of position and maintain position 4B Closed - Open 5 MOV-11 DC MOV control circuit with desired change of state Close - Open 6A Close - Throttled Double pole DC motor control circuit with desired MOV-15 change of state - remote and local operation 6B Close - Throttled (Local) 7A Standby - On CCW Medium difficulty 4.16 kV pump involving change of Pump 1B position and maintain position 7B Off - Off 8 MCC-1B 480V MCC Energized - Energized 9 LC-B 480V Load Center Energized - Energized (Norm) 10 ANN-1 Annunciator Circuit Available - Nonspurious 11 FCV-605A Instrument control signal to flow control valve Closed - Modulate Available - Available (FT-12 TTR2 Instrument loop - temperature indicator 605A) 13 COMP-1 480 V Motor Cycle - Cycle