JPM RO-A4 — Determine Radiological Dose and Stay Times for Containment Entry
Admin | RO/SRO | G2.3.13 (3.4)
Location: Classroom
Time-Critical: No
Alternate Path: No
Estimated Time: 10 minutes
Initial Conditions:
- Salem is in Mode 1 at 100%.
- The 22 CFCU has been declared inoperable.
- Tagging has been completed.
Initiating Cue:
- You have been directed by the WCCS to determine stay times for entering containment to hang additional tags on 22 CFCU.
- Assume the following:
- Safety has determined the heat stress stay time to be 15 minutes
- Radiation protection has limited total dose received by individual to 0.002 REM gamma and 0.008 REM Neutron
1. In accordance with the provided survey map perform the following:
1.1 Calculate the following for the Operator:
- Gamma dose stay time _____ minutes
- Neutron dose stay time _____ minutes
1.2 Determine most limiting allowable time for containment entry team based on ALARA and Heat Stress:
- Limiting containment entry time _____ minutes
Time-Critical: No
Alternate Path: No
Estimated Time: 10 minutes
Initial Conditions:
- Salem is in Mode 1 at 100%.
- The 22 CFCU has been declared inoperable.
- Tagging has been completed.
Initiating Cue:
- You have been directed by the WCCS to determine stay times for entering containment to hang additional tags on 22 CFCU.
- Assume the following:
- Safety has determined the heat stress stay time to be 15 minutes
- Radiation protection has limited total dose received by individual to 0.002 REM gamma and 0.008 REM Neutron
1. In accordance with the provided survey map perform the following:
1.1 Calculate the following for the Operator:
- Gamma dose stay time _____ minutes
- Neutron dose stay time _____ minutes
1.2 Determine most limiting allowable time for containment entry team based on ALARA and Heat Stress:
- Limiting containment entry time _____ minutes
Task Standard:
Determines that based on the dose limits Gamma dose stay time is 24 minutes, Neutron dose stay time is 12 minutes, and heat stress stay time is 15 minutes. Determines that limiting entry time will be based on Neutron dose at 12 minutes.
Determines that based on the dose limits Gamma dose stay time is 24 minutes, Neutron dose stay time is 12 minutes, and heat stress stay time is 15 minutes. Determines that limiting entry time will be based on Neutron dose at 12 minutes.
▶ Show Critical Steps & Key Actions
| Step | Critical Element | Standard |
|---|---|---|
| 1.1.A * | Calculate Neutron dose stay time | From survey map: neutron dose rate at 22 CFCU area = 40 mrem/hr. Limit = 0.008 REM = 8 mrem. Stay time = (8 mrem / 40 mrem/hr) x 60 min/hr = 12 minutes |
| 1.1.B * | Calculate Gamma dose stay time | From survey map: gamma dose rate at 22 CFCU area = 5 mrem/hr. Limit = 0.002 REM = 2 mrem. Stay time = (2 mrem / 5 mrem/hr) x 60 min/hr = 24 minutes |
| 1.2 * | Determine most limiting allowable time for containment entry | Compare: Neutron = 12 min, Heat Stress = 15 min, Gamma = 24 min. Most limiting = Neutron dose at 12 minutes. |
Key Decision Point:
Step 1.2 is the discriminating step -- the applicant must compare all three limiting factors (gamma dose stay time of 24 min, neutron dose stay time of 12 min, and heat stress stay time of 15 min) and correctly identify the neutron dose as the most limiting at 12 minutes. The applicant must read dose rates from the survey map for the 22 CFCU area, correctly convert REM limits to mrem for the calculation, and identify the lowest stay time as the controlling factor for entry.
Step 1.2 is the discriminating step -- the applicant must compare all three limiting factors (gamma dose stay time of 24 min, neutron dose stay time of 12 min, and heat stress stay time of 15 min) and correctly identify the neutron dose as the most limiting at 12 minutes. The applicant must read dose rates from the survey map for the 22 CFCU area, correctly convert REM limits to mrem for the calculation, and identify the lowest stay time as the controlling factor for entry.
Ref: RP-AA-300 (Rev 6), Radiological Survey Map #2213000 (dated 8-5-21) | Task: N1200100104 | K/A: G2.3.13 — Knowledge of radiological safety principles pertaining to licensed operator duties | Source: New | View JPM PDF
Connections
- Related systems: CFCUs, Radiation Monitoring
- Related procedures: RP-AA-300 — Radiological Survey Program
- Related exam: 2022 NRC Operating Exam