RQ-C-4931, Pressurizer/Pressure Relief/Pressure & Level Control Flashcards
1
Q
How can a Tave failure affect pressurizer level?
A
- Auctioneered Tave is used to determine Pressurizer Level setpoint
2
Q
What is the Pressurizer high level setpoint w/ coincidence?
A
- 92% on 2/3 level channels
3
Q
QRV-251 is throttling open. QRV-112 and all orifice isolation valves are closed. All Pressurizer Heaters have tripped off. What instrument has failed?
A
Pressurizer Level Control channel has failed low.
4
Q
Channel 4 of Pressurizer Pressure (NPS-153), which is selected as the Bistable Channel, fails low. Before actions can be taken to deselect channel 4 can occur, an event takes place that causes Pressurizer Pressure to exceed 2335 PSIG. Which PORV’s will open in Auto?
A
None. The Bistable channel is used for 1 of the 2 signals needed to open NRV-151 and NRV-153. Channel 4 is used for 1 of the 2 signals needed to open NRV-152.
