Software Step 4

Step 4 Determine the most Credible Failure Scenario:

Below is explained how to implement Step 4 in the Software. See also Methodology Step 4.

To start:

• After the RBI Analysis has been started.
• Select the Component – DM combination, to be risk assessed.
• Make sure that the assessment view is expanded to show the top section.

Review the Operating Conditions

To review the Operating Conditions in IMS:

• Select the Operating conditions tab in the right section.
• Select the Product from the dropdown to lookup the Nf and Nh factors, AIT, FP, etc., if not already available. Note: If your product is missing you can request to have it added in Settings \ Maintenance \ RBI Specific Data \ Product.
• Click Apply to specs if desired.
• Use the Liquid Release Calculator or Hole Size table & Release Rate plots to determine the Release Rate.

Select the operating conditions tab and select the product to look up the Nf and Nh factors.

Note: This information is specifically needed for the Detailed People Consequence Assessment in Step 8.

Review RBI Specs

To review the RBI specs in IMS:

• Select the RBI Specs tab in the left section.
• Review available specs (including the specs defined on the Equipment and Component).
• Click Edit to add additional specs.
• Click Save.

RBI Specs.

Note: S-RBI specifications are used throughout the S-RBI assessment to document key material and process data needed for the assessment. Some of the specifications input in the S-RBI assessment are stored as specifications to ensure that there is only one set of data used.

Review DM Attachments

To review the DM Attachments in IMS:

• Select the Attachments tab.
• Review the assigned DM documentation. Note: These can be imported via Settings.

Define the Credible Failure Scenario

To define the Failure Scenario in IMS:

• Select the Criticality Assessment tab.
• Click on Scenario.
• Click Edit.

Select the Criticality Assessment tab, click Scenario, and click Edit to enter the failure scenario.

 

• Described the Scenario, as established by the S-RBI team.
• Images and links can be added as well.
• Click Save.