2018 Q84 — Loss of RHR / Containment Closure

✓ B. Correct. For Part 1, S2.OP-AB.CONT-0001 states that for a loss of RHR, Containment Closure should be established prior to Core Boiling. For Part 2, S2.OP-AB.CONT-0001 states that for a loss of RHR, the Outage Equipment Hatch may be closed using 4 corner bolts.

✗ A. Part 1 is correct. For Part 2, if the reason for entering S2.OP-AB.CONT-0001 was due to something other than Loss of RHR, then the crew would install the Outage Equipment Hatch (using ALL 10 bolts) by using the guidance contained in SC.MD-FR.CAN-0001. Consequently, the candidate could incorrectly conclude that with a loss of RHR in progress, the crew will install the Outage Equipment Hatch for Containment Closure by using the guidance contained in SC.MD-FR.CAN-0001.

✗ C. For Part 1, S2.OP-AB.CONT-0001 states that when the initiating event is other than a Fuel Handling Incident or Loss Of RHR, Containment Closure should be established within four hours. Additionally, with the cavity flooded, time to boil on a Loss of RHR can be several hours. Consequently, the candidate could incorrectly conclude that with a Loss of RHR in progress and the cavity flooded, S2.OP-AB.CONT-0001 states that Containment Closure should be established within a MAXIMUM of four hours. For Part 2, if the reason for entering S2.OP-AB.CONT-0001 was due to something other than Loss of RHR, then the crew would install the Outage Equipment Hatch (using ALL 10 bolts) by using the guidance contained in SC.MD-FR.CAN-0001.

✗ D. For Part 1, S2.OP-AB.CONT-0001 states that when the initiating event is other than a Fuel Handling Incident or Loss Of RHR, Containment Closure should be established within four hours. Part 2 is correct.

Ref: S2.OP-AB.CONT-0001 | LO: NOS05ABCONT-07 (CONTAINMENT CLOSURE) — 2. Describe, in general terms, the actions taken in S1/S2.OP-AB.CONT-0001 (Q) and the bases for the actions in accordance with the Technical Bases Document | Source: New | Cognitive: Higher