NOPs Flashcards
What rate of power reduction requires a RCS sample for iodine?
Any power change greater than or equal to 15% per hour
What is the setpoint and coincidence of P-8? What is the reset setpoint and coincidence?
Active when 3/4 power Range channels are less than or equal to 29%. (Permits auto block of “at power” trips).
Reset when 2/4 PR channels are greater than 29%
When is the interlock C-5 active?
Blocks auto rod withdrawal when turbine impulse pressure (MPC-253) is less than 15% equivalent power pressure
If Improper bank overlap occurred during the Rx shutdown, what actions would you take?
Notify MTI and SS of the problem but continue w the Rx shutdown until all roads are fully inserted and Rx trip breakers are open.
When one feed pumps speed is lowered what causes the other feed pump to speed up?
The FP speed controller compares feed hdr and steam hdr pressure difference to a programmed d/p value.
How many PR channels must be less than 10% in order to clear P-10 status light. What should be done if it doesn’t clear?
3/4 channels less than 10% clears the P-10 status light.
Corrective measure steps of the procedure should be performed.
Why are the steam dumps placed to steam pressure mode?
To align control system so that Tavg is maintained via steam pressure of the bypass hdr. This allows dumps to assume temp control as the turbine is unloaded and prior to being tripped.
Why should the high flux at shutdown alarm setpoint be changed?
Bc the neutron source strength is greater than it was when the reactor startup was performed
Why do we energize Pressurizer heaters 12 hrs before a planned power reduction?
Minimize the impact on RCS Hydrogen
Why are all available PRZ hers energized during a power change?
To minimize the PRZ and RCS loop boron concentration difference.
What can prolonged use of maximized pressurizer spray result in?
Hydrogen being stripped out of solution, requiring additions to VCT.
How many source range channels shall be in operation and recording continuously on NI Recorder SG-12 while the reactor is shutdown with fuel in the reactor?
Minimum of 2
Prolonged Turbine operation at less than 10% load must be avoided due to…..
Moisture erosion of last stage blades and exhaust hood heating
When the reactor is critical RCS temperature is maintained greater than or equal to 541*F. IF it falls below this temp, how long do you have to get it back and how do we do so?
30 minutes by reduction in steam demand.
What is the limit for rod movement above the POAH?
3 steps at a time until the associated reactivity effects are complete
What does it mean if P-10 remains lit with an inopeable power range channel?
- PR high flux low setpoint trip is not enabled
- IR high flux trip is not enabled
- SR detector voltage will not be restored below P-6 setpoint
Whose permission is needed if we plan on using SG PORVs as a planned method of RCS temp control?
Ops Director
Whose permission is needed for extended low-power operation?
Plant Manager
How can we alleviate potential issues with RCS Hydrogen?
Maintain VCT pressure at the high end of the band
How many NIs are required to perform Rx Startup?
Per TS: 2 SR, 2 IR, and at least 3 PR
How are the control rod urgent and non-urgent alarms reset?
At startup, the step counter reset can be used to reset the alarms.
After rod withdrawal begins, the alarm power reset at the cabinet must be used
Why are we required to perform ICRR plot during a reactor startup?
It’s a backup to the ECP. The prediction helps ensure that the critical rod position is above the Lo-Lo Insertion Limit, thus ensuring adequate SDM during startup
What indication will you observe when the reactor goes critical?
Power rising with a sustained positive start up rate with no rod motion
Why is the high flux at shut down alarm defeated before the reactor start up?
The alarm is there to alert the operator that an unplanned reactivity addition is occurring and should be investigated. A reactor start up is planned, and therefore the alarm is of no value and could be distracting if not blocked prior to start up