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Exams > 2022 Q83 — LBLOCA Emergency Classification

2022 Q83 — LBLOCA Emergency Classification

⚠️ DRAFT
Q83 — LBLOCA Emergency Classification W E16 G2.4.41 (4.6)
Given:

• Unit 2 reactor tripped due to a LBLOCA.
• RCS pressure is 60 psig.
• Containment pressure is 30 psig and lowering.
• CETs are 720 °F and lowering.
• 2R44A, Containment High Range, Radiation Monitor is indicating 2020 R/hr.
• 2R44B, Containment High Range, Radiation Monitor is indicating 2010 R/hr.

Which ONE of the following is the correct classification and barrier status?

[REFERENCE PROVIDED]
A. Site Area Emergency; Loss of 2 barriers Only.
B. Site Area Emergency; Loss of 1 barrier and Potential Loss of 2nd barrier.
C. General Emergency; Loss of 2 barriers and Potential Loss of 3rd barrier.
D. General Emergency; Loss of 3 barriers.
▶ Show Answer & Explanation
✓ C. Correct. IAW EP-SA-325-123, Fission Product Barrier Table, with a LBLOCA actuating SI and 2R44A and B reading above 2000 R/hr, then the following EALs apply; FB2.L (Loss 5 points), and RB1.L or RB2.L (Loss 5 points), and CB2.P (Potential 2 points). Total points = 12 point GE with a Loss of 2 barriers and a Potential Loss of 3rd barrier.
✗ A. Incorrect. The classification should be for GE and the barrier status is incorrect since potential loss of 3rd barrier also exists. Plausible if one of the barriers is missed.
✗ B. Incorrect. The classification should be for GE and the barrier status is incorrect since two barriers are lost and potential loss of 3rd barrier also exists. Plausible if one of the barriers is missed.
✗ D. Incorrect. 3 barriers have not been lost yet. Plausible if the SRO incorrectly evaluates the barrier status as 3 barriers are lost.
Ref: EP-SA-325-123 (R00) | LO: NOS05TRP001-09, Objective 20 | Source: Bank – ANO 1 2017 Retake NRC SRO84 | Cognitive: Comprehension/Analysis

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