RQ-C-4812 (DBV, Generator, Transformer, Turbine, CVCS Annunciator Response)

Question 1

Which one of the following inidcations are reason to trip the turbine to prevent damage to the main turbine blades?

A) U1 Low Pressure Turbine bearing #5 metal temperature is 270°F and rising.
B) Moisture Separator Drain Tank Level High-High alarms are standing with level rising and the drain valve is full open.
C) Bus Duct Fans are failed and an AEO reports Bus Duct temperature is 106°C and rising.
D) U1 Main Turbine has a High Vibration alarm standing with bearing 5 Low Pressure Turbine at 14 mils.

Answer 1

B) Moisture Separator Drain Tank Level High-High alarms are standing with level rising and the drain valve is full open.

Question 2

Which 600V Buses supply power to Main Transformer Cooling?

Answer 2

21C & 21D Train A 600V Busses

Question 3

Unit 1 is at 100% power with all control systems in automatic. Power Range N42 Upper Detector output rapidly fails LOW. Which ONE of the following describes the expected plant response with no operator action?

A) Channel 2 OTΔT set point will be LOWER than it was before the failure.
B) Rods will WITHDRAW until the Tavg-Tref Error offsets the Power Mismatch circuit.
C) Channel 2 OPΔT set point will be HIGHER than it was before the failure.
D) Rods will continuously INSERT until the operator places Rod Control in MANUAL.

Answer 3

A) Channel 2 OTΔT set point will be LOWER than it was before the failure.

Question 4

Unit 2 is operating at 27% power with both Main Feed Pumps (MFP) running when the following indications are observed:

• Feedwater flows – LOWERING on all Steam Generators
• Feedwater Isolation Signal – actuated on both trains
• # 21 S/G NR Level – 67% and rising
• # 22, 23 and 24 S/G NR Levels – 50% and lowering

Which ONE of the following describes the expected plant response to the above conditions?

A) Both MFPs and the Main Turbine immediately trip. The Main Turbine trip causes an immediate reactor trip.
B) Both MFPs trip. When the stop valves on both MFPs fully close, the Main Turbine and the Reactor trip.
C) Both MFPs and the Main Turbine immediately trip. The Reactor trips when SG NR levels lower to their trip set point.
D) Both MFPs remain running. The Main Turbine trips. The Reactor stabilizes at approximately 27% power on the Steam Dumps.

Answer 4

C) Both MFPs and the Main Turbine immediately trip. The Reactor trips when SG NR levels lower to their trip set point.