JPM SRO-A4 — Personnel Exposure for Containment Entry at Power
Admin | SRO | G2.3.4 (3.7)
Location: Classroom
Time-Critical: No
Alternate Path: No
Estimated Time: 20 minutes
Initial Conditions:
- Salem 2 is at 100% power reducing power at 10% per hour to perform Turbine valve testing.
- The 22 CFCU has been declared inoperable.
- Tagging has been completed.
Initiating Cue:
- You are the WCCS and need to send operators into containment to remove tags to allow work on 22 CFCU disassembly to continue.
- Operator A has 1992 mrem TEDE for the year and Operator B has 1496 mrem TEDE for the year so far.
- Using the provided Radiological Survey Map and procedures, determine the following:
1. Whose authorization outside of Operations, by position, is needed to enter the containment during the downpower?
2. In accordance with the provided survey map perform the following:
2.1. Calculate the dose for each operator (Assume both operators each take 12 minutes in the area to perform their tagging evolution):
Gamma dose ___ mrem
Neutron dose ___ mrem
2.2. Will the operators exceed the Administrative Annual Dose limit? If so, identify which Operator(s)?
Time-Critical: No
Alternate Path: No
Estimated Time: 20 minutes
Initial Conditions:
- Salem 2 is at 100% power reducing power at 10% per hour to perform Turbine valve testing.
- The 22 CFCU has been declared inoperable.
- Tagging has been completed.
Initiating Cue:
- You are the WCCS and need to send operators into containment to remove tags to allow work on 22 CFCU disassembly to continue.
- Operator A has 1992 mrem TEDE for the year and Operator B has 1496 mrem TEDE for the year so far.
- Using the provided Radiological Survey Map and procedures, determine the following:
1. Whose authorization outside of Operations, by position, is needed to enter the containment during the downpower?
2. In accordance with the provided survey map perform the following:
2.1. Calculate the dose for each operator (Assume both operators each take 12 minutes in the area to perform their tagging evolution):
Gamma dose ___ mrem
Neutron dose ___ mrem
2.2. Will the operators exceed the Administrative Annual Dose limit? If so, identify which Operator(s)?
Task Standard:
1. Determines the Radiation Protection Supervisor must authorize entry.
2. Determines Gamma dose for each operator is 1 mrem.
3. Determines Neutron dose for each operator is 8 mrem.
4. Determines Operator A total dose is 2001 mrem and Operator B total dose is 1505 mrem. Operator A exceeds administrative dose control limit of 2000 mrem.
1. Determines the Radiation Protection Supervisor must authorize entry.
2. Determines Gamma dose for each operator is 1 mrem.
3. Determines Neutron dose for each operator is 8 mrem.
4. Determines Operator A total dose is 2001 mrem and Operator B total dose is 1505 mrem. Operator A exceeds administrative dose control limit of 2000 mrem.
▶ Show Critical Steps & Key Actions
| Step | Critical Element | Standard |
|---|---|---|
| 1.0 * | Determine whose authorization outside of Operations is needed for containment entry during downpower | Radiation Protection Supervisor (RPS) as designated in RP-SA-102 and SC.SA-ST.ZZ-0001. |
| 2.1.A * | Calculate Gamma dose for each operator | 12 minutes / 60 minutes x 5 mrem/hr = 1 mrem gamma. |
| 2.1.B * | Calculate Neutron dose for each operator | 12 minutes / 60 minutes x 40 mrem/hr = 8 mrem neutron. |
| 2.2 * | Determine if operators exceed Administrative Annual Dose limit and identify which operator(s) | Operator A: 1992 + 1 + 8 = 2001 mrem — EXCEEDS ADCL of 2000 mrem (1 mrem above). Operator B: 1496 + 1 + 8 = 1505 mrem — below ADCL (495 mrem below). Only Operator A exceeds the administrative dose control limit. |
Key Decision Point:
Step 2.2 is the discriminating step — the applicant must add BOTH gamma (1 mrem) and neutron (8 mrem) doses to each operator's existing annual TEDE, then compare against the 2000 mrem Administrative Dose Control Limit. Operator A at 1992 + 9 = 2001 mrem just barely exceeds the limit by 1 mrem. The applicant must correctly include neutron dose (which is the dominant contributor at 40 mrem/hr vs 5 mrem/hr gamma) in the total to recognize the exceedance.
Step 2.2 is the discriminating step — the applicant must add BOTH gamma (1 mrem) and neutron (8 mrem) doses to each operator's existing annual TEDE, then compare against the 2000 mrem Administrative Dose Control Limit. Operator A at 1992 + 9 = 2001 mrem just barely exceeds the limit by 1 mrem. The applicant must correctly include neutron dose (which is the dominant contributor at 40 mrem/hr vs 5 mrem/hr gamma) in the total to recognize the exceedance.
Ref: RP-SA-102 (Rev 0), SC.SA-ST.ZZ-0001 (Rev 5), RP-AA-300 (Rev 6), RP-AA-463 (Rev 6), RP-AA-203 (Rev 6) | Task: 1200100104 | K/A: G2.3.4 — Knowledge of radiation exposure limits under normal or emergency conditions | Source: New | View JPM PDF
Connections
- Related systems: CFCUs, Containment
- Related procedures: RP-SA-102 — Containment Entries at Power, RP-AA-203 — Exposure Control and Authorization, RP-AA-300 — Radiological Survey Program
- Related admin: RP-AA-460 — Controls for High and Very High Radiation Areas
- Related exam: 2022 NRC Operating Exam