JPM IP-j — Locally Open Reactor Trip Breakers and Control Charging Flow
In-Plant | RO/SRO | 012 A4.06 (4.3/4.3)
Location: In-Plant (RCA) — 84 ft Elevation Switchgear Room, Aux Bldg Charging Valve Alley
Time-Critical: No
Alternate Path: No
Estimated Time: 25 minutes
Initial Conditions:
- The Unit 1 Control Room has been evacuated in accordance with S1.OP-AB.CR-0001, Control Room Evacuation.
- A reactor trip from 100% was initiated prior to evacuating the Control Room, but the reactor failed to trip from the control room.
Initiating Cue:
- You are the Reactor Operator.
- The CRS directs you to locally trip open the Reactor Trip Breakers and take local control of charging flow by PERFORMING Steps 1 thru 9 IAW Attachment 5 of S1.OP-AB.CR-0001, Control Room Evacuation.
Time-Critical: No
Alternate Path: No
Estimated Time: 25 minutes
Initial Conditions:
- The Unit 1 Control Room has been evacuated in accordance with S1.OP-AB.CR-0001, Control Room Evacuation.
- A reactor trip from 100% was initiated prior to evacuating the Control Room, but the reactor failed to trip from the control room.
Initiating Cue:
- You are the Reactor Operator.
- The CRS directs you to locally trip open the Reactor Trip Breakers and take local control of charging flow by PERFORMING Steps 1 thru 9 IAW Attachment 5 of S1.OP-AB.CR-0001, Control Room Evacuation.
Task Standard:
1. Locally OPEN Reactor Trip and Bypass Breakers.
2. Locally controls 1CV55 to maintain charging flow.
1. Locally OPEN Reactor Trip and Bypass Breakers.
2. Locally controls 1CV55 to maintain charging flow.
▶ Show Critical Steps & Key Actions
| Step | Critical Element | Standard |
|---|---|---|
| 1.0 | OBTAIN required equipment (procedure copy, radio, key ring set, tools, Security Master Key) | Operator reviews S1.OP-AB.CR-0001, Att. 5 and proceeds to El. 84 switchgear room (outside RCA). Obtains all required items (provided via cue). |
| 2.0 * | PROCEED to Rod Drive MG Set Control Panel (460V Vital Bus Room, El 84) and OPEN Reactor Trip Breaker A and Reactor Trip Breaker B | Simulates opening each breaker by removing cover and depressing the TRIP pushbutton until the breaker flag indicates OPEN. Note: Operator only opens Reactor Trip Breakers that are currently racked in and closed. Bypass Trip Breakers are typically Open and racked out (N/A). |
| 3.0 | CONFIRM with Hot Shutdown Panel Operator that 11 or 12 Charging Pump is operating | Contacts PO and confirms 11 charging pump is operating. |
| 4.0 * | PROCEED to 1AX1AX7X, #13 Charging Pump breaker AND OPEN the breaker | Locates 1AX1AX7X, #13 Charging Pump breaker at 84 ft El. SGWR Room, 1A 460V MCC. Depresses the trip PB to open the breaker. |
| 5.0 * | PROCEED to 1C West Valve & Misc 230V Control Center El 84 and OPEN Breaker 1CY2AX41, 1CV175 Rapid Borate Stop Valve | Locates 1C West Valve & Misc 230V Control Center at 84 ft El. Inside RCA, Aux Bldg across from AFW pumps. Opens Breaker 1CY2AX41 (1CV175 Rapid Borate Stop Valve) by rotating switch to OFF position. |
| 6.0 | NOTIFY the CRS: Reactor Trip and Bypass breakers are OPEN; #13 Charging Pump Breaker is OPEN | Reports to CRS that breakers are open. |
| 7.0 | CONFIRM with NEO #1 that 1CV71 (Chr Hdr PCV) is isolated (1CV70) and bypassed (1CV73) with RCP seal flow at 6 to 10 gpm per seal | Contacts NEO #1 and confirms 1CV71 is isolated and bypassed, flow maintained at 8 gpm per seal. |
| 8.1 * | RECORD charging flow from 1FI-128A at Panel 216-1 | Proceeds to Unit 1 Panel 216-1 (Chg Pmps FL & PR Inst Pnl) at 84 ft El. Aux Bldg, Charging Valve Alley. Records charging flow from 1FI-128A (typical ~87-89 gpm). Note: panel door alarm requires control room notification before opening. |
| 8.2 * | PLACE local E/P Bypass Line Selector Valve in Manual | Locates local E/P Bypass Line Selector Valve and simulates rotating valve clockwise to Manual position. |
| 8.3 * | Using the MANUAL hand air operator, ENSURE flow rate from Step 8.1 is being maintained with 1CV55 | Reads 1FI-128A; flow has LOWERED 10 gpm from recorded value. Adjusts Manual Hand Operator counter-clockwise to LOWER air pressure and OPEN 1CV55, raising charging flow back to recorded value. 1CV55 is a fail-open (air-to-close) valve: lowering air pressure opens the valve and raises flow. |
| 8.4 | OBSERVE local air pressure indicator to verify local control | Observes local air pressure indicator reads 8 psig. |
| 9.0 | NOTIFY CRS and STA that Steps 1 through 8 of Attachment 5 are completed | Notifies CRS and STA that all steps are complete. |
Key Decision Point:
Step 8.3 is the discriminating step. After taking local control of 1CV55 (Cent Chg Pmp Flow Cont Valve), charging flow drops 10 gpm below the recorded baseline. The applicant must understand that 1CV55 is a fail-open, air-to-close valve: to raise flow, the operator must LOWER air pressure by turning the manual hand air operator counter-clockwise. Turning clockwise (raising air pressure) would further close the valve and reduce flow. This tests the applicant's understanding of valve fail-safe directions during a control room evacuation scenario. The broader JPM also tests knowledge of physical plant layout across multiple locations: Rod Drive MG Set room (El. 84), 1A 460V MCC (SGWR Room, El. 84), 1C West 230V Control Center (inside RCA, across from AFW pumps), and Panel 216-1 in the Charging Valve Alley.
Step 8.3 is the discriminating step. After taking local control of 1CV55 (Cent Chg Pmp Flow Cont Valve), charging flow drops 10 gpm below the recorded baseline. The applicant must understand that 1CV55 is a fail-open, air-to-close valve: to raise flow, the operator must LOWER air pressure by turning the manual hand air operator counter-clockwise. Turning clockwise (raising air pressure) would further close the valve and reduce flow. This tests the applicant's understanding of valve fail-safe directions during a control room evacuation scenario. The broader JPM also tests knowledge of physical plant layout across multiple locations: Rod Drive MG Set room (El. 84), 1A 460V MCC (SGWR Room, El. 84), 1C West 230V Control Center (inside RCA, across from AFW pumps), and Panel 216-1 in the Charging Valve Alley.
Ref: S1.OP-AB.CR-0001 (R18), Attachment 5 | Task: 1130070501 | K/A: 012 A4.06 — Ability to manually operate and/or monitor in the control room: Reactor trip breakers (manual) | Source: Modified | View JPM PDF
Connections
- Related systems: RPS/SSPS, CVCS, RCPs
- Related procedures: AB.CR-0001 — Control Room Evacuation
- Related exam: 2018 NRC Operating Exam