General Flashcards
When are the Intermediate Range Monitors utilized?
The IRMs are used during startup/heatup or other low power operations.
What are the differences between the Source Range Monitors and the Intermediate Range Monitors?
The IRMs have the same enrichment in their Uranium Oxide coating but it’s a thinner layer. The IRMs also operate with a lower voltage and a lower Argon gas pressure.
How does an Intermediate Range Monitor differentiate between neutron and gamma pulses?
The “Mean Square Voltage” technique, or “Campbell Method”, squares each pulse until the gamma pulse becomes insignificant.
What provides power the Intermediate Range Monitors?
The Reactor Protection System provides the IRMs power.
RPS A - IRM A, IRM C, IRM E, IRM G
RPS B - IRM B, IRM D, IRM F, IRM H
What levels, in the Core, are the Full In and Full Out position for the IRMs?
Full In - 18 inches above Core midplane
Full Out - 30 inches below the Core
How fast can the Intermediate Range Monitors be inserted/retracted, and how long does it take to fully removed the Intermediate Range Monitors from the Core if fully inserted?
The Intermediate Range Monitors move at a speed of 3 feet per minute, therefore it will take 3.5 minutes to fully retract the IRMs from the Core if they are fully inserted.
How many ranges do the Intermediate Range Monitors have?
The IRMs have TEN ranges.
What factor do the Intermediate Range Monitor readings change by when moving from one range to the next?
One range up/down will change the current readings by a factor of approximately 3.1(square root of 10). SO, if you range up/down twice, in the same direction, the readings will change by a factor of ten.
What are the approximate power levels at the top of ranges 6, 8, and 10?
Range 6 - .4 %
Range 8 - 4 %
Range 10 - 40 %
How does placing the Mode Switch in RUN affect the Intermediate Range Monitors?
All of the Intermediate Range Monitor Scrams and Rod Blocks are bypassed.
How does placing the IRM Bypass Joystick in Bypass affect the Intermediate Range Monitors?
All of the Intermediate Range Monitors Scrams and Rod Blocks are bypassed.
What Intermediate Range Monitor signals will produce a Rod Block?
1) INOP
2) Downscale 5/125
3) Upscale 80/125
4) Detector not Full In
What Intermediate Range Monitor conditions produce an “INOP” signal?
1) Function Switch NOT in Operate
2) Card out of file
3) High/Low voltage
4) Detector unplugged
How can an Intermediate Range Monitor Downscale Rod Block signal be bypassed?
The associated IRM Detector on range 1 will bypass the Downscale Rod Block signal. (IRM bypassed or Mode Switch in RUN bypasses all Rod Blocks)
How can an Intermediate Range Monitor Upscale Rod Block signal be bypassed?
The IRM Upscale Rod Block signal can be bypassed if the IRM is bypassed or the Mode Switch is in RUN.
How can an Intermediate Range Monitor “Detector Not Full-In” Rod Block signal be bypassed?
The IRM “Detector Not Full-In” can be bypassed if the IRM is bypassed using the joystick or the Mode Switch in RUN.
What Intermediate Range Monitor signals will produce a Scram?
1) INOP
2) High High Upscale 120/125
How can the Intermediate Range Monitor Scram signals be bypassed?
The IRM Scram signals can be bypassed if the IRM is bypassed or the Mode Switch is in RUN.
When do the Downrange and Up Range lights illuminate for the Intermediate Range Monitors?
15/125 - Downrange Light
75/125 - Up Range Light
What Intermediate Range Monitor range is where the Point of Adding Heat is usually reached?
Range 7
