Incore

Question 1

State the functions of the incore detectors

Answer 1

• Provides a means to measure the core three dimensional power distribution in order to verify compliance with core power distribution limits
• Serves as a calibration standard for excore NI axial flux difference indications and as a means to determine target AFD
• Detect/ verify unacceptable operating conditions such as control rod misalignment, axial or radial offset anomalies

Question 2

State the functions of the incore instrumentation core exit thermocouple system

Answer 2

Provides PAM qualified indication used to confirm adequate core cooling

• Core cooling Critical safety function
• Input to the subcooling margin monitor
• Temperature input for RVLIS density compensation

Question 3

Describe how the FIDs are self powered

Answer 3

High energy fission gammas interact with dense plantinum emitter by photo-electric effect or by Compton scattering

Question 4

State the function of the seal table

Answer 4

RCS pressure boundary
Termination point for fixed incore detector leads
interface point for moveable incore detectors
Connection point for RVLIS

Question 5

State T.S. 3.2.2 (Heat Flux Hot Channel Factor) LCO and Action

Answer 5

Heat Flux Hot Channel Factor shall be limited by (some equation that RE uses)
MODE: 1
1. Reduce THERMAL POWER at least 1% for each 1% FQ(Z) exceeds the limit within 15 minutes and similarly reduce the Power Range Neutron Flux-High Trip Setpoints within the next 4 hours; POWER OPERATION may proceed for up to a total of 72 hours; subsequent POWER OPERATION may proceed provided the Overpower ΔT Trip Setpoints have been reduced at least 1% for each 1% FQ(Z) exceeds the limit, and
2. THERMAL POWER may be increased, provided FQ(Z) is demonstrated through incore mapping to be within its limit.