JPM SRO-A2 — Determine Heat Stress Requirements
Admin | SRO | G2.1.26 (3.6)
Location: Classroom (Administrative)
Time-Critical: No
Alternate Path: No
Estimated Time: 10 minutes
Initial Conditions:
- Unit 2 is at 100% power
- 2PS3, PZR Spray Valve, is operating erratically and a decision has been made to enter containment to isolate the 2PS3 by closing the manual isolation valve (2PS28)
- The 2PS28 is located inside the PZR housing (dog house), upper elevation, and is known to be very physically demanding on the operators to operate. Two operators will be required to simultaneously operate the valve using a valve wrench during the entire valve operation. Operators will also have to climb ladders to access the 2PS28 in the dog house
- The Shift Manager needs to determine the amount of resources needed to close this valve given the Heat Stress conditions
- Rad Pro has provided a Wet Bulb Globe Thermometer (WBGT) temperature of 89 F for the work area
- Rad Pro has determined that operators will need to wear double PCs
- Cooling Garments will not be used
Initiating Cue:
- You are the Unit 2 Control Room Supervisor
- DETERMINE the following using SA-AA-111, Heat Stress Control:
1. What is the Stay Time?
2. Assume the task will need more time and Check Times will be used. What is the Maximum Extended Stay Time?
3. Assume the task required the use of the maximum extended stay time. What is the Recovery Time?
- Provide your answers on the Initiating Cue sheet
Time-Critical: No
Alternate Path: No
Estimated Time: 10 minutes
Initial Conditions:
- Unit 2 is at 100% power
- 2PS3, PZR Spray Valve, is operating erratically and a decision has been made to enter containment to isolate the 2PS3 by closing the manual isolation valve (2PS28)
- The 2PS28 is located inside the PZR housing (dog house), upper elevation, and is known to be very physically demanding on the operators to operate. Two operators will be required to simultaneously operate the valve using a valve wrench during the entire valve operation. Operators will also have to climb ladders to access the 2PS28 in the dog house
- The Shift Manager needs to determine the amount of resources needed to close this valve given the Heat Stress conditions
- Rad Pro has provided a Wet Bulb Globe Thermometer (WBGT) temperature of 89 F for the work area
- Rad Pro has determined that operators will need to wear double PCs
- Cooling Garments will not be used
Initiating Cue:
- You are the Unit 2 Control Room Supervisor
- DETERMINE the following using SA-AA-111, Heat Stress Control:
1. What is the Stay Time?
2. Assume the task will need more time and Check Times will be used. What is the Maximum Extended Stay Time?
3. Assume the task required the use of the maximum extended stay time. What is the Recovery Time?
- Provide your answers on the Initiating Cue sheet
Task Standard:
Determines: Stay Time = 20 mins, Maximum Extended Stay Time = 30 mins, and Recovery Time = 90 mins.
Determines: Stay Time = 20 mins, Maximum Extended Stay Time = 30 mins, and Recovery Time = 90 mins.
▶ Show Critical Steps & Key Actions
| Step | Critical Element | Standard |
|---|---|---|
| 4.1.1 | OBTAIN the WBGT temperature for the work location and RECORD on Attachment 4 | CRS records WBGT of 89 F from initial conditions on Attachment 4 |
| 4.1 * | CLASSIFY the work environment as High Temperature, Very High Temperature, or Extremely High Temperature. RECORD in line 3 of Attachment 4 | Classifies environment as High Temperature based on work area temperature of 89 F |
| 4.2 * | DETERMINE Work Rate using Attachment 2, Work Rate Metabolism Guideline. RECORD results in line 4 of Attachment 4 | Determines Work Rate = HIGH based on: sustained heavy physical work (valve wrench operation, climbing ladders, two operators required) for >50% of work time inside PZR dog house |
| 4.3 | DETERMINE clothing ensemble and adjustment factor | Determines clothing = Double Cloth Coveralls (double PCs) with adjustment factor of +9 F to WBGT |
| 4.4 * | DETERMINE the Stay Time using WBGT/Dry Bulb value from 4.1, work rate from 4.2, and clothing ensemble from 4.3. RECORD in line 6 of Attachment 4 | Effective WBGT = 89 F + 9 F = 98 F. Using Attachment 3 with WBGT 98 F and High work demand: Stay Time = 20 min |
| 4.6 * | DETERMINE the Maximum Extended Stay Time (1.5 x ST) | Maximum Extended Stay Time = 1.5 x 20 mins = 30 mins |
| 4.8 * | DETERMINE the Recovery Time. RECORD in line 12 of Attachment 4 | Recovery Time = (Actual Work Time / Stay Time) x 60 = (30 / 20) x 60 = 90 mins |
Key Decision Point:
Step 4.2 is the discriminating step. The applicant must classify the work rate as HIGH (not Moderate) based on the initial conditions describing sustained heavy physical work — operating a valve wrench, climbing ladders, two operators required simultaneously, in the physically demanding PZR dog house environment. High Work Rate is defined as sustained heavy physical exertion for >50% of work time. Moderate activities involving negative pressure air-purifying respirators also classify as High, but that is not the basis here. The entire calculation chain depends on correctly identifying HIGH work rate, which then drives the Stay Time of 20 minutes (vs. a longer time for Moderate), the Extended Stay Time of 30 minutes, and the Recovery Time of 90 minutes.
Step 4.2 is the discriminating step. The applicant must classify the work rate as HIGH (not Moderate) based on the initial conditions describing sustained heavy physical work — operating a valve wrench, climbing ladders, two operators required simultaneously, in the physically demanding PZR dog house environment. High Work Rate is defined as sustained heavy physical exertion for >50% of work time. Moderate activities involving negative pressure air-purifying respirators also classify as High, but that is not the basis here. The entire calculation chain depends on correctly identifying HIGH work rate, which then drives the Stay Time of 20 minutes (vs. a longer time for Moderate), the Extended Stay Time of 30 minutes, and the Recovery Time of 90 minutes.
Ref: SA-AA-111 (Rev. 12) | Task: N1220400302 | K/A: G2.1.26 — Knowledge of industrial safety procedures | Source: New | View JPM PDF
Connections
- Related systems: Pressurizer & PRT
- Related procedures: SA-AA-111 — Heat Stress Control, RP-SA-102 — Containment Entries at Power
- Related exam: 2018 NRC Operating Exam