Local Power Range Monitors (LPRM) - .5

Question 1

Number of detectors

Answer 1

172 Detectors (43 per channel)

Question 2

How does a fission chamber ionization detector work.

Answer 2

70% enriched U3O8 fission chamber Ionization (Ionization curve) detector pressurized with 20 psia Argon. Operates at 100VDC.

Question 3

How often is it calibrated?

Answer 3

Every 1000 EFPH with TIPS

Question 4

What are the three lights associated with LPRMs?

Answer 4

• Bypass
• Downscale (4%)
• Upscale (>100%)

Lights located on 10C608/650
Downscale automatically removes LPRM from RBM.

Question 5

EPA setpoints

Answer 5

• Overvoltage (110%)
• Undervoltage (90%)
• Underfrequency (55Hz)