PMS(1) - Protection and Safety Monitoring

For now, this set will encompass PMSR&PMSS

Overall

Simplified Diagram

BCC

Simplified Diagram

Logic Table

True/False

Good/Bad

RTS/ESF

Key Points

Default:

RTS: Trip

ESF: Do NOT Actuate

Reactor Trip Breakers

Location

Access

12422(23) Near Main Control Room

Doors locked, key in WCC/MCR

Color scheme is different than traditional commercial breakers, use “OFF” button to trip open

Conditions to RESET “S”

P-3 ON

AND

“S” signal has been active ≥60sec

Hardware Implemented Reactor Trip Signals from Manual Switches

“Hardwired”

“CARS”

C - CMT Actuation

A - ADS 1-3 Actuation

R - Reactor Trip Switch

S - Safeguards “S”

*These switches also generate P-4, EXCEPT Manual Reactor Trip Switch

**The RSR Manual Reactor Trip Switch is software so therefore WILL generate a P-4 demand

Critical Safety Function Visual Alerts

Actuated by:

Safeguards “S”

Manual Reactor Trip

P-4

Can be reset after P-3 ON

PMS

Loss of Power Consequences

Design Definitions

Single Failure Criterion

Redundancy

Independence

Physical Separation

Single Failure Criterion

Single failure will not prevent needed protection or cause unnecessary one

Redundancy

No. of divisions available > No. of required for test/maint.

Independence

Electronically isolated

Physical Separation

Separate rooms (Fire Protection)

Set/Reset Latches

Black Line indicates which signal has priority

Safeguards “S”

Latched vs. Unlatched

Setpoints/Interlocks

Safeguards “S”

Permissive Overview