Incore Instrumentation system

Question 1

Incore instrumentation system’s purpose?

Answer 1

• Montiors fuel assembly outlet temperatures and neutron flux within the reactor core.
• Also used to calibrate the Excore NIS

Question 2

Comprised of two subsystems which are?

Answer 2

• Miniature detector flux mapping system

- Core Exit Thermocouple (CET) system

Question 3

Flux mapping system consist of ?

Answer 3

• 50 incore detector/thermocouple thimble assemblies. (46 are used, 3 abandoned and 1 used for RVLIS)
• 5 path rotary transfer device
• 10 path rotary transfer device
• 5 Neutron flux detectors

Question 4

CET system consist of ?

Answer 4

-2 chormel-alumel thermocouples per thimble, 1 in use and one spare.

Question 5

Power supplies to:
Drive units A-E
Encoder Power supply
Bus 1 Switchover panel
Bus 2 switchover panel
Dryer

Answer 5

• MCC-2 (Drive Units)
• LP-31(MCC-2) (Encoder)
• LP-26 (MCC-1)
• LP-28 (MCC-2)
• LP-27(MCC-2) (Dryer)