JPM RO-A3 — Identify Components to Isolate SW Leak Using Drawings
Admin | RO/SRO | G2.2.41 (3.5/3.9)
Location: Classroom (Administrative)
Time-Critical: No
Alternate Path: No
Estimated Time: 30 minutes
Initial Conditions:
- Unit 2 is in a Refueling outage with the reactor defueled
- A Service Water leak has been identified by your field operator on a 2 inch drain valve (21SW268) near the 21SW76 valve inside the SW Valve Room, Auxiliary Building
- The 21SW76 is a manual isolation valve for the SW outlet of 21 CFCU
- The 21SW268, 21 NUC HDR FROM FCV DRAIN, is a 2 inch drain valve downstream of the 21SW76, 21 CFCU SW OUTLET VLV
- The field operator reports that the leak is at the body to bonnet location of the valve
Initiating Cue:
- You are the Work Control NCO
- The Work Control SRO directs you to identify the minimum number of components needed to isolate the leak
- Drains and vents are NOT required to be identified at this point
- A complete work clearance (tagout) with all required blocking points will be performed in accordance with station procedures after leak isolation
- Assume check valves will function as designed with no leak-by
- Mark up (or circle components) on the provided P&ID drawings for the valves required to be closed and document your list of valves on this Cue Sheet
Time-Critical: No
Alternate Path: No
Estimated Time: 30 minutes
Initial Conditions:
- Unit 2 is in a Refueling outage with the reactor defueled
- A Service Water leak has been identified by your field operator on a 2 inch drain valve (21SW268) near the 21SW76 valve inside the SW Valve Room, Auxiliary Building
- The 21SW76 is a manual isolation valve for the SW outlet of 21 CFCU
- The 21SW268, 21 NUC HDR FROM FCV DRAIN, is a 2 inch drain valve downstream of the 21SW76, 21 CFCU SW OUTLET VLV
- The field operator reports that the leak is at the body to bonnet location of the valve
Initiating Cue:
- You are the Work Control NCO
- The Work Control SRO directs you to identify the minimum number of components needed to isolate the leak
- Drains and vents are NOT required to be identified at this point
- A complete work clearance (tagout) with all required blocking points will be performed in accordance with station procedures after leak isolation
- Assume check valves will function as designed with no leak-by
- Mark up (or circle components) on the provided P&ID drawings for the valves required to be closed and document your list of valves on this Cue Sheet
Task Standard:
Operator identifies the following valves on drawing 205342 as a minimum to be closed to isolate leak:
21SW472 (sheet 3), 21SW355 (sheet 3), 21SW50 (sheet 3), 21SW414 (sheet 5), 21SW78 (sheet 6), 22SW76 (sheet 6), 21SW76 (sheet 6), 21SW646 (sheet 6), 22SW646 (sheet 6).
Optional Valves (credit for check valves preventing backflow): 21SW844 (sheet 3), 21/22/23SW45 (sheet 3).
Operator identifies the following valves on drawing 205342 as a minimum to be closed to isolate leak:
21SW472 (sheet 3), 21SW355 (sheet 3), 21SW50 (sheet 3), 21SW414 (sheet 5), 21SW78 (sheet 6), 22SW76 (sheet 6), 21SW76 (sheet 6), 21SW646 (sheet 6), 22SW646 (sheet 6).
Optional Valves (credit for check valves preventing backflow): 21SW844 (sheet 3), 21/22/23SW45 (sheet 3).
▶ Show Critical Steps & Key Actions
| Step | Critical Element | Standard |
|---|---|---|
| 1 * | Mark up (or circle components) the provided P&ID drawings for the valves required to be closed | Using the P&IDs provided, the operator highlights or marks the minimum valves to isolate (close) the leak. |
| 2 * | List the components needed to be closed to isolate the leak | 21SW472 (sheet 3), 21SW355 (sheet 3), 21SW50 (sheet 3), 21SW414 (sheet 5), 21SW78 (sheet 6), 22SW76 (sheet 6), 21SW76 (sheet 6), 22SW646 (sheet 6), 21SW646 (sheet 6) |
Key Decision Point:
The applicant must trace through P&ID 205342 (sheets 1-7) to identify all flow paths to the leaking drain valve 21SW268. The drain valve is downstream of 21SW76 (21 CFCU SW outlet valve) on the nuclear header. The key challenge is identifying all the boundary valves needed on multiple P&ID sheets — the leak location requires isolation from both the SW supply side (upstream through the CFCU) and the return/discharge side (downstream toward the nuclear header). The applicant must also determine which valves on the cross-connected headers (22SW76, 22SW646) are required. Optional valves (21SW844, 21/22/23SW45) are not required if the applicant takes credit for check valves preventing backflow.
The applicant must trace through P&ID 205342 (sheets 1-7) to identify all flow paths to the leaking drain valve 21SW268. The drain valve is downstream of 21SW76 (21 CFCU SW outlet valve) on the nuclear header. The key challenge is identifying all the boundary valves needed on multiple P&ID sheets — the leak location requires isolation from both the SW supply side (upstream through the CFCU) and the return/discharge side (downstream toward the nuclear header). The applicant must also determine which valves on the cross-connected headers (22SW76, 22SW646) are required. Optional valves (21SW844, 21/22/23SW45) are not required if the applicant takes credit for check valves preventing backflow.
Ref: Drawing 205342 Sheets 1-7 | Task: N1220050302 | K/A: G2.2.41 — Ability to obtain and interpret station electrical and mechanical drawings | Source: New | View JPM PDF
Connections
- Related systems: Service Water, CFCUs
- Related exam: 2020 NRC Operating Exam