Source range and intermediate range nuclear instruments Flashcards
A loss of control power to SR or IR instruments below P6(P10) or above P6(P10) when not blocked will result in ______.
Reactor trip
A loss of instrument power to SR or IR instruments below P6(P10) or above P6(P10) when not blocked will result in ______ unless the _____switch is in ______.
Reactor trip
Level trip switch
Bypass
Above P6/P10 when SR IR trips blocked, reactor trip ______occur on loss of ______.
will not
Instrument or control power
The _____ switch will block both the ______ trip and _______ rod stop.
level trip bypass
IR flux high trip
IR flux high rod stop
When instrument power is lost, ______ on the instrument drawer go out. _____goes out when ____ is lost.
All lights
Control power on
Control power
If one IR channel inoperable _____ or ______.
Reduce power to
If both IR channels inoperable ______ and _______.
Suspend positive reactivity additions immediately
-and-
Reduce power to
The following 4 circuits are energized to actuate:
- RWST L0-2 level 46.7% 2/4
- Containment pressure hi-3 pressure 20 psig 2/4
- P-6 SR block permissive 1.0E-5% RTP IR, energize at power
- P-11 PZR pressure low permissive 1930 psig 2/3
N31/N35 and N32/N36 SR/IR detectors are ________ that operate in the ______ region.
Fission chamber detectors that operate in the ionization region.
Function of wide range amplifier:
Device provides the power supply for the detectors, receives the output of the detector, and does the pulse shaping and discriminating necessary for the Source range. Also performs initial signal processing for the IR Channels
The optical isolator has a power supply switch on the front that selects _____ or ______.
Instrument bus 111/112 or ESF MCC bus 131X2/132X2
Inside the Optical Isolator cabinet is a switch:
App R or test position. Normally in test but can be switched for control room inaccessibility.
What is the advantage of using a fission chamber verses the BF3 detectors?
-High reliability in a harsh environment
-Can operate in a gamma flux in excess of 10E4 R/hr w/o damage or loss of sensitivity
SR uses output from ____ chamber(s) (risen sensitivity) while IR uses output of _____ chamber(s).
Both fission chambers
Single fission chamber
Due to “coincidence”, the effect of having one fission chamber (is/is not) noticeable at _____ count rates
is not; higher count rates
