Designing SIF Subsystems (Building the Hardware Configuration)

The Subsystems that were added on the General tab can be further defined/designed on the Design Tab in terms of the Equipment Actors.

To add or remove Equipment Actors:

• Click the Plus or Minus button.

• Click the Plus or Minus button to add or remove Equipment Actors.

You can use the Equipment hyperlink to navigate to the specific Equipment to confirm the details. The applicable proof Tests, many of the Fault tolerance checks, and FMEA are all defined on the Equipment level. It is important to set the Test Coverage Factors for the Tests in the FMEA table on the Equipment Details Page. 

Changing the Subsystem Details

Click the Edit button to change the details such as Name, Type, Plant/Unit, Description, TI Alignment, TSO Requirements, Effective/Expiration Dates, and Target Accuracy.

This can also be done from the General Tab.

Subsystem Change Rules

You can edit Subsystem parameters either via the Subsystem Settings or directly within the SIF Analysis, on both the General Tab and here on the Design Tab.

When changes are made from the SIF Analysis

• When the Subsystem is only used in Draft SIF Analyses:

  • Changes to Subsystem Details—such as Name, Type, Plant/Unit, Description, TI Alignment, TSO Requirements, and Target Accuracy—are automatically synchronized across all linked SIF Analyses. Note: Changing the Subsystem Type will automatically remove any existing Equipment.

  • These changes are also reflected in the SIS Subsystem Settings.

  • Subsystem Design changes (e.g., Equipment, Tests) are not synchronized initially. However, once the SIF Analysis containing the updated Subsystem is Final Approved, all linked SIF Analyses will inherit the changes.

• When the Subsystem is used in one or more Final Approved SIF Analyses:

  • In this case it is not allowed to change the Subsystem Type from the SIF Analysis.

  • Changes to the Subsystem will not immediately affect the linked SIF Analyses. However, once the SIF Analysis containing the updated Subsystem is Final Approved, all linked SIF Analyses will revert to Draft and inherit the changes.

  • Changes will also not be reflected in the SIS Subsystem Settings immediately, but only after the SIF Analysis containing the updated Subsystem is Final Approved.

When Changes are made from the SIS Settings

If any of the following Subsystem Details are modified from the SIS Subsystem Settings, then all SIF Analyses using that Subsystem will automatically revert to Draft and inherit the changes:

• Type (Note: any existing Equipment in the SIF Analysis will be removed)

• Name

• Plant / Unit

• Align TI

• Target Accuracy (for Sensor Subsystems)

• TSO Required (for FE Subsystems) - including related fields when selected

Role Requirements

To edit Subsystems, users must have one of the following roles: SIS Admin, SIS SIF Design, or SIS SIF Design Contractor.