Fire Protection SDP Phase 1 Screening The Fire Protection SDP Phase 1 serves to screen out very low risk significant findings. This qualitative screening approach is entered when the following items are met: The inspection finding clearly states the licensee performance deficiency and the criteria met in accordance with IMC 0612, Appendix B, “Issue Screening”. The finding should discuss, as applicable, the noncompliance with any applicable licensing basis requirements. The SDP analysis should not proceed if the condition of the fire protection feature was specifically approved in a Safety Evaluation Report (SER) during the fire protection licensing process (i.e., there is no performance deficiency). The worksheets for recording the Fire Protection SDP Phase 1 “Statement of Fire Inspection Finding”, and “Assign a Fire Finding Category” are provided in Attachment 1. Step 1.1 - Provide Statement of Fire Inspection Finding Provide a clear statement of fire inspection finding and the non-compliance in the Attachment 1 worksheet for recording the Fire Protection SDP Phase 1 “Statement of Fire Inspection Finding”. Step 1.2 – Assign a Fire finding Category Record the assigned fire finding category in Attachment 1 worksheet, “Category of Fire Inspection Finding.” A Fire finding can only be assigned to one category. Step 1.3 - Ability to Achieve Safe Shutdown Task 1.3.1: Screen Fire Finding for Ability to Achieve Safe Shutdown 1.3.1 A Question: Is the reactor able to reach and maintain safe shutdown (either hot or cold) condition? O Yes – Screens to no further analysis required. O No – Continue to next question.
Figure F.3 - Non-Suppression Probability Decision Tree Non- Suppression Probability Value (S) No Automatic Detection No Detection in Area 1.0 Very Large Fire (indoor oil-filled transformers, or energetic electrical fires) 1.0 Auto Suppression in Fire Area CO2 0.04 Fire Event Halon Systems 0.05 Wet Pipe Sprinkler 0.02 Deluge or Preaction sprinkler 0.05 Detection in Area Manual Suppression only (detection must be present in the fire zone) Small Electrical Fires D≤1 ft 1.0 D>1ft Thermoplastic Cables 0.3 Thermoset Cables 0.1 Engines/Heaters Fires D≤2 ft 1.0 D>2ft Thermoplastic Cables 0.3 Thermoset Cables 0.1 Solid/Transients Fires D≤2 ft 1.0 D>2 ft Thermoplastic Cables 0.3 Thermoset Cables 0.1 Large Electrical Fires D≤4.5 ft 1.0 D>4.5 ft Thermoplastic Cables 1.0 Thermoset Cables 0.3 Control Room Small Electrical Fires Thermoplastic Cables 0.1 Thermoset Cables 0.03 Control Room Large Electrical Fires Thermoplastic Cables 0.3 Thermoset Cables 0.1 D, distance between target and fire.
For FDS1, two fire damage mechanisms are considered; namely, fire plume effects (including direct flame impingement), and direct radiant heating. Included in the timing analysis is consideration of fire spread to secondary combustibles if such fire spread is required to create the damaging exposure conditions.
Review each Category, and its Task and Scenario Characteristics with any additional Performance Shaping Factors to determine if it is applicable to the manual action being evaluated. For each that applies, record the evaluation value (i.e., α, β, 2β, or γ) Sum the evaluation factors and apply the following rules sequentially in order to determine the value assigned to the HEP for that manual action, with one exception - if time is expansive, go to next bullet (○ ). If any row is α, then use a credit of 0. If the sum of rows evaluated as β or 2β is≥ 3β, then assume it is equivalent to α and use a credit of 0. If all categories are γ, the use a credit of 2. Otherwise, use a credit of 1. If the time available is evaluated to be expansive, sum the remaining evaluation factors (other than time) and apply the following rules sequentially in order to determine the value assigned to the HEP for that manual action: If any row is α, or the sum of the βs >3β, use a credit of 0. If the sum of the βs = 3β, use a credit of 1. If the sum of the βs ≤ 2β, use a credit of 2. Repeat the review for each defined manual action within the scenario.
Multiple tasks at different locations In the absence of an RSP for example, it is assumed that several tasks are performed at diverse locations, requiring a significant degree of coordination. 2β Control task (e.g., maintaining AFW) Indications available locally β Indications not available locally 2β Time available Time Adequate to reach location and perform activity Include time needed to obtain procedure if applicable γ Time limited β Time inadequate or barely adequate α Time expansive Note 1 Select HEP credit based on the following rules: If any row is α, then use 0 If the sum of rows evaluated as β or 2 β is ≥ 3 β, then assume equivalent to α and use 0 If all categories are γ, then use a credit of 2 Otherwise (i.e., if the sum of rows evaluated as β or 2 β is β or 2 β), then use a credit of 1 Note 1: If sum of the ratings is ≥α or >3β, use 0; if the sum is 3β, use a credit of 1; if the sum is ≤ 2β, use a credit of 2 Table 2.8.2 - Manual Actions Evaluation Table for Actions at a Remote Location Category Task and Scenario Characteristics Performance Shaping Factors Comments Evaluation Direct Physical Effect of Fire (Ergonomics) RSO and all areas where local actions take place are well separated from the fire location γ Operator must pass through areas affected by fire environment to reach RSO or other areas where local actions are taken 2β No barrier or potentially significant leakage between RSO or other required locations and fire area Dense smoke, high temperature, and/or CO2 impact in location No credit for SCBAs α