Q71 — Emergency Exposure Stay Time
G 2.3.4 (3.2)
Given:
• A large break LOCA is in progress and core damage has occurred with high radiation levels in accessible plant areas.
• To prevent further core damage, the Operations Support Center (OSC) is dispatching an NEO to locally operate a failed MOV in an area surveyed at 100 R/hr.
Which ONE of the following is the MAXIMUM stay time (in minutes) for the operator to perform the task without exceeding the authorized planned emergency exposure limit?
• A large break LOCA is in progress and core damage has occurred with high radiation levels in accessible plant areas.
• To prevent further core damage, the Operations Support Center (OSC) is dispatching an NEO to locally operate a failed MOV in an area surveyed at 100 R/hr.
Which ONE of the following is the MAXIMUM stay time (in minutes) for the operator to perform the task without exceeding the authorized planned emergency exposure limit?
A. 3
B. 6
C. 15
D. 45
▶ Show Answer & Explanation
✓ C. Correct. IAW NC.EP-EP.ZZ-0304, Attachment 3, 25 Rem is the planned emergency exposure limit (PEEL) for accident mitigation. Therefore, maximum stay time is [(25 R / 100 R/hr) x 60 min/hr = 15 minutes].
✗ A. Incorrect. Plausible if you use the 10 CFR 20 Federal annual limit of 5 Rem TEDE as the maximum exposure limit.
✗ B. Incorrect. Plausible if you use 10 Rem as the maximum limit for protecting valuable property IAW RP-AA-203.
✗ D. Incorrect. Plausible if you use 75 Rem as the planned emergency exposure limit (PEEL) for life saving.
Ref: NC.EP-EP.ZZ-0304 (R17), RP-AA-203 (R6) | LO: NOS05RADCON-06, Objective 3 | Source: Modified Bank – Byron 2019 NRC RO72 (October exam) | Cognitive: Comprehension/Analysis
Connections
- Related procedures: NC.EP-EP.ZZ-0304 — OSC Radiation Protection Response
- Related exam: 2022 NRC Written Exam