JPM SRO-A1 — Isolate Non-Essential Chilled Water Loads
Admin | SRO | G2.1.25 (4.2)
Location: Classroom
Time-Critical: No
Alternate Path: No
Estimated Time: 10 minutes
Initial Conditions:
- It is July 15th time 1800 and you have just assumed the watch as the Unit 2 CRS. It was turned over that both 21 and 22 Chillers tripped at 1600 and you are currently in T/S 3.7.10 action 'b', entered at 1600.
- To comply with the T/S action, the crew is implementing S2.OP-SO.CH-0001, Chilled Water System Operation, Section 4.6, Isolation of Non-Essential Heat Loads.
- During preparations to align #2 ECAC cooling to Service Water IAW S2.OP-SO.CA-0001, Control Air System Operation, it was reported that the spool pieces required to align to service water cannot be located.
- Unit 2 CREACS has been removed from service IAW step 4.6.2 of S2.OP-SO.CH-0001.
- CW Inlet Water Temperature Readings from SC.OP-DL.ZZ-0008(Q), Circulating / Service Water Log are:
2TL3756 = 83.4°F
2TL3757 = 83.6°F
Initiating Cue:
- You are the Unit 2 CRS.
- The Shift Manager directs you to NOT isolate the #2 ECAC and to re-perform the Non-Essential heat load determination IAW Attachment 2.
- DETERMINE the total Non-Essential heat load and SELECT the required components for isolation IAW S2.OP-SO.CH-0001, Chilled Water System Operation, Attachment 2 to comply with Tech Specs.
Time-Critical: No
Alternate Path: No
Estimated Time: 10 minutes
Initial Conditions:
- It is July 15th time 1800 and you have just assumed the watch as the Unit 2 CRS. It was turned over that both 21 and 22 Chillers tripped at 1600 and you are currently in T/S 3.7.10 action 'b', entered at 1600.
- To comply with the T/S action, the crew is implementing S2.OP-SO.CH-0001, Chilled Water System Operation, Section 4.6, Isolation of Non-Essential Heat Loads.
- During preparations to align #2 ECAC cooling to Service Water IAW S2.OP-SO.CA-0001, Control Air System Operation, it was reported that the spool pieces required to align to service water cannot be located.
- Unit 2 CREACS has been removed from service IAW step 4.6.2 of S2.OP-SO.CH-0001.
- CW Inlet Water Temperature Readings from SC.OP-DL.ZZ-0008(Q), Circulating / Service Water Log are:
2TL3756 = 83.4°F
2TL3757 = 83.6°F
Initiating Cue:
- You are the Unit 2 CRS.
- The Shift Manager directs you to NOT isolate the #2 ECAC and to re-perform the Non-Essential heat load determination IAW Attachment 2.
- DETERMINE the total Non-Essential heat load and SELECT the required components for isolation IAW S2.OP-SO.CH-0001, Chilled Water System Operation, Attachment 2 to comply with Tech Specs.
Task Standard:
1. Determines the Total Heat Load Isolation value required is 902.8 kBTU/HR.
2. Selects the required components on Table B for isolation and ensures that the total value is greater than 902.8 kBTU/HR.
1. Determines the Total Heat Load Isolation value required is 902.8 kBTU/HR.
2. Selects the required components on Table B for isolation and ensures that the total value is greater than 902.8 kBTU/HR.
▶ Show Critical Steps & Key Actions
| Step | Critical Element | Standard |
|---|---|---|
| Att 2 1.A | RECORD inlet water temperature data for Table A from SC.OP-DL.ZZ-0008(Q) | Enters temperatures from cue sheet (2TL3756 = 83.4°F, 2TL3757 = 83.6°F). Records highest temperature (83.6°F) and adds 1.5°F for instrument uncertainty = 85.1°F. |
| Att 2 1.B | RECORD number of inoperable Chiller Units | Lists 2 Chillers Inoperable. |
| 1.C * | RECORD the TOTAL HEAT LOAD ISOLATION from Table A | From Table A, determines 902.8 kBTU/HR based on inlet water temp of 85.1°F, 2 chillers inoperable, in Maintenance Mode with Unit 2 EACS Out of Service. |
| 1.D | IDENTIFY the components to be isolated in Table B | Selects non-essential loads for isolation. |
| 1.E * | RECORD heat load values from Table B into Isolation column for selected components | Selects values from Table B: 21 PACU = 145.7, 22 PACU = 145.7, 23 PACU = 145.7, Secondary Lab = 192.1, Primary Lab = 165.9, Counting Room = 73.0, PASS = 38.5. Selects N/A for ECAC per SM direction. |
| 1.F * | ADD values recorded in Isolation column and RECORD Total Isolation value | Determines Total Heat Load Isolation per Table B is 906.6 kBTU/HR. |
| 1.G * | ENSURE Total Isolation value (Table B) is greater than or equal to Total Heat Load Isolation (Step 1.C) | Determines 906.6 kBTU/HR > 902.8 kBTU/HR — isolation is adequate. |
| 1.1 | ISOLATE the selected components IAW Section 4.6 of this procedure | CUE: The NCO will isolate the selected components IAW Section 4.6. |
Key Decision Point:
Step 1.C is the first discriminating element — the applicant must correctly enter Table A using 85.1°F (highest CW temp 83.6°F + 1.5°F instrument uncertainty), 2 chillers inoperable, and Maintenance Mode with EACS out of service to determine 902.8 kBTU/HR. Step 1.E is the second key decision — the applicant must select enough non-essential loads to exceed 902.8 kBTU/HR while keeping the ECAC available per SM direction. The specific combination totaling 906.6 kBTU/HR excludes the ECAC. This is the same JPM concept as the 2022 SRO-A1 (identical initial conditions, values, and procedure).
Step 1.C is the first discriminating element — the applicant must correctly enter Table A using 85.1°F (highest CW temp 83.6°F + 1.5°F instrument uncertainty), 2 chillers inoperable, and Maintenance Mode with EACS out of service to determine 902.8 kBTU/HR. Step 1.E is the second key decision — the applicant must select enough non-essential loads to exceed 902.8 kBTU/HR while keeping the ECAC available per SM direction. The specific combination totaling 906.6 kBTU/HR excludes the ECAC. This is the same JPM concept as the 2022 SRO-A1 (identical initial conditions, values, and procedure).
Ref: S2.OP-SO.CH-0001 (Rev 34), S2.OP-SO.CA-0001, SC.OP-DL.ZZ-0008(Q) | Task: 0980020202 | K/A: G2.1.25 — Ability to interpret reference materials, such as graphs, curves, tables, etc. | Source: New | View JPM PDF
Connections
- Related systems: Chill Water, Control Air, Service Water
- Related procedures: S2.OP-SO.CH-0001 — Chilled Water System Operation
- Related tech specs: TS 3/4.7 — Plant Systems
- Related exam: 2018 NRC Operating Exam