NIS

Question 1

Source Range Detectors

name, location, power supplies, type of counter

Answer 1

• N-31, N-32
• South/North (share well with IR) (18”-24” outside RV)
• IB-1/IB-2
• BF3 proportional counter

Question 2

Intermediate Range Detectors

names, locations, power supplies, type of counter

Answer 2

• N-35/N-36
• South/North (Share well with SR)(18”-24” outside RV)
• IB-1/IB-2
• Compensated Ion Chambers

Question 3

Power Range Detectors

names, locations, power supplies, type of counter

Answer 3

• N-41/N-42/N-43/N-44
• SE/NW/SW/NE (quadrants)
• IB-1/IB-2/IB-3/IB-4
• Uncompensated Ion Chambers

Question 4

R.G. 1.97 detectors

Names, locations, power supplies, type of counter

Answer 4

• N-51/N-52
• West/East
• IB-1/IB-8
• N51 alt power is DS Bus via kirk key
• Duel Fission Chambers (post accident monitoring)

Question 5

At Power Reactor Trips

Answer 5

• RCS Low flow
• RCP Break open
• 4KV Undervoltage
• PZR low pressure
• PZR high level

Question 6

Purpose of NIS (Nuclear Instrumentation system)

Answer 6

• To protect the reactor by monitoring the neutron flux and generating appropriate trips and alarms
• RG 1.97 monitor gross core power level (flux) for accident and post accident conditions