Q10 — EOP-FRSM-1 / ATWS Actions
EPE 29 G2.4.6 (3.7)
Given:
• Unit 2 experienced a valid reactor trip demand but the reactor failed to trip.
• The RO attempted a MANUAL reactor trip by operating both reactor trip switches (pistol grip) and depressing the reactor trip breaker pushbuttons, but was unsuccessful in tripping the reactor.
In accordance with 2-EOP-FRSM-1, Response to Nuclear Power Generation – ATWS, which ONE of the following is the NEXT required action?
• Unit 2 experienced a valid reactor trip demand but the reactor failed to trip.
• The RO attempted a MANUAL reactor trip by operating both reactor trip switches (pistol grip) and depressing the reactor trip breaker pushbuttons, but was unsuccessful in tripping the reactor.
In accordance with 2-EOP-FRSM-1, Response to Nuclear Power Generation – ATWS, which ONE of the following is the NEXT required action?
A. INITIATE Emergency Boration.
B. INSERT control rods at maximum rate using MANUAL and/or AUTO rod control.
C. TRIP the Main Turbine.
D. OPEN both Rod Drive M-G Set breakers 2E6D and 2G6D.
▶ Show Answer & Explanation
✓ B. Correct. IAW 2-EOP-FRSM-1 step 1 (Immediate Actions) the reactor is tripped in the following order: 1) Reactor Trip Switches, 2) Trip Breaker Bezel, 3) Insert control rods at maximum rate using MANUAL and AUTO rod control, 4) open breakers 2E6D and 2G6D, and then 5) send operators to locally open reactor trip breakers. Therefore, based on the choices provided the next action is for the operator to insert control rods at maximum rate using AUTO and MANUAL control rods.
✗ A. Initiating emergency boration comes at step 4 of FRSM-1. Plausible since this is an action performed in FRSM-1.
✗ C. Tripping the Main Turbine comes after all attempts in step 1 are performed to trip the reactor. Plausible since this is an action performed in FRSM-1.
✗ D. Opening MG set supply breakers comes after rods are inserted at maximum rate. Plausible since this is an action performed in FRSM-1.
Ref: 2-EOP-FRSM-1, Rev 40 | LO: NOS05FRSM00, Objective 2 | Source: Bank - Salem | Cognitive: Fundamental/Memory
Connections
- Related EOPs: EOP-FRSM-1 — Response to Nuclear Power Generation
- Related exam: 2022 NRC Written Exam