ISA TR67.04.08 : 1996

1 Scope
2 Purpose
3 Definitions
4 Discussion
     4.1 Minimum separations between setpoints
     4.2 Typical types of systems
Annex A - (informative) References
Figures
1 - Instrument channel layout for the generalized
    system
2 - Illustration of relationships that may apply in
    determining minimum separations of setpoints for
    sequenced actions
3 - Instrument channel layout for system having high
    pre-trip and high trip bistables driven by the same
    transmitter
4 - Setpoint relationships for interrelating high pre-trip
    and high trip bistables driven by the same transmitter
    with example values for a typical PWR pressurizer
    pressure system
5 - Instrument channel layout for system having high and
    low alarm bistables driven by the same transmitter
6 - Setpoint relationships for interrelating high and low
    alarm bistables driven by the same transmitter, with
    example values for a typical spray pond level system
7 - Instrument channel layout for system having high and
    low pre-trip bistables all driven by the same transmitter
8 - Instrument channel layout for system having high pre-
    trip and trip bistables driven by one transmitter and
    low pre-trip and trip bistables driven by a different
    transmitter
9 - Setpoint relationships for interrelating high and low
    pre-trip and trip bistables driven by the same or
    different transmitters, with example values for typical
    PWR pressurizer pressure systems
10- Instrument channel layout for system having high and low
    alarm bistables driven by one transmitter and a low-low
    trip bistable driven by a different transmitter
11- Setpoint relationships for interrelating high and low
    alarm bistables driven by one transmitter and a
    relating low-low trip bistable driven by a different
    transmitter, with example values for a typical
    refueling water tank level system

Provides guidance on the handling of setpoints for sequenced actions in both nuclear safety-related and nuclear power plant non-safety-related instrumentation.