Nuclear Instrumentation Rod Blocks and Scrams Flashcards
When does the SRM Short Period alarm actuate?
When power is changing by a factor of E shorter than 50 seconds
How are SRM Rod Blocks and Scrams bypassed?
Mode Switch in RUN, or the SRM is bypassed
What is the purpose of the Shorting Links?
With the Shorting Links installed all SRM Scrams are bypassed.
What conditions would produce an SRM INOP signal?
1) SRM Mode Selector Switch not in OPERATE 2) High volts 3) Low volts 4)Card out of file
What SRM signals produce a Rod Block?
1) INOP 2) Downscale at 0.7 cps 3) <100 cps and detector not full in 4) Upscale at 1E5 cps
What is required to bypass the SRM Downscale signal that produces a Rod Block?
1) Both of the associated IRMs on range 3 or greater 2) Both of the associated IRMs on range 8 or greater
What is required to bypass the SRM <100 cps and detector not full in Rod Block?
1) Both of the associated IRMs on range 3 or greater 2) Both of the associated IRMs on range 8 or greater
What is required to bypass the SRM Upscale signal that produces a Rod Block?
Both of the associated IRMs on range 8 or greater
What SRM signals produce a Reactor Scram?
1) INOP 2) Hi Hi at 2E5 cps
How are IRM Rod Blocks and Scrams bypassed?
Mode switch in RUN, or the IRM is bypassed
What conditions would give an IRM INOP signal?
1) IRM Mode Selector Switch not in OPERATE 2) High volts 3) Low volts 4)Card out of file
What IRM signals produce a Rod Block?
1) INOP 2) Downscale at 5/125 3) Upscale 80/125 4) Detector not full in
What is required to bypass the IRM Downscale signal that produces a Rod Block?
The IRM Range Switch on range 1
What IRM signals produce a Reactor Scram?
1) INOP 2) Hi Hi 120/125
OPRMs produce Reactor Scram signals based on what three monitoring functions?
1) Period 2) Amplitude 3) Growth Rate
