NI Flashcards
Limits and Precautions
Normal startup rate is to be < what? The prompt (transient) change associated with this rate should be < what?
1.0 DPM
1.5 DPM
Limits and Precautions
IAAT, SR or IR SUR exceeds how many dpm?, TRIP the RX and go to EOP-001
3.0 DPM
Tech Specs
3.5.1.5: minimum of how many decade overlap between SR and IR NI’s
1.0 DPM
Tech Specs
Power range, how many min operable, min deg of redundancy, and what to do if not?
2 min op, 1 min deg of red, restore in 1 hour or HSD in 6 hours
Tech specs
Intermediate range, how many min operable, min deg of redundancy, and what to do if not?
1 min op, 0 min deg red, when 2 of 4 pwr range ?10%, IR NOT required. If above NOT met, RESTORE in 1 hr/HSD in 6 hours
Tech specs
Source Range, how many min operable, min deg of redundancy, and what to do if not?
1 min op, 0 min deg red, when 1 of 2 IR > 10^-10 A OR 2 of 4 pwr range >10%, S.R. is NOT required. If above NOT met, RESTORE in 1 hr/HSD in 6 hours
System Operation
Normal Operation: over time NI’s read what than PPC heat balance due to depletion of fuel and radial flux moving outward.
Higher
System Operation
Calibrate if delta > what percent power imbalance (top half of core power – bottom half of core power)
Delta >2%
System Operation
Equipment failure
Indication of undercompensated IR detectors would be the IR detector coming on-scale with the SR NI not yet to how many counts?
1x10^4 counts
System Operation
Equipment failure
Startup is still permissible following failure of a single what range NI?
Source range
System operation
Equipment failure
Above what percent power, IR NI’s are NOT required. Failure of how many IR detectors (low) at 5% power requires restoration in how long or place reactor in what?
Above 10% power
Failure of BOTH IR detectors (low) at 5% power requires:
Restoration in 1 hour
OR
Place RX in HSD
SR interlocks:
RB evac alarm setpoint/reset
CRD withdrawal inhibit: setpoint/reset
Bypassed points
Bypass reset
RB evac alarm: 40 cps rising, reset 30 cps lowering
CRD withdrawal inhibit: 2.0 DPM, reset .5 dpm lowering
Bypassed >10% on NI-5 or 6 AND NI-7 or NI-8
Bypass reset at 3% lowering
IR interlocks:
CRD withdrawal inhibit: setpoint/reset
Bypassed points
Bypass reset
CRD withdrawal inhibit: 3.0 DPM, reset .5 DPM lowering
Bypassed >10% on NI-5 or 6 AND NI-7 or NI-8
Bypass reset at 3% lowering
Power Range Interlocks:
RPS Channel Bistables:
Control rod drive withdrawal inhibit
SASS selection:
Bistables: high flux trip, flux/flow imbalance trip, flux/pumps trip, turbine trip bypass, FWP bypass
Control rod drive withdrawal inhibit: all 4 channels provide bistable inputs for bypass to SR and IR CRD withdrawal inhibits
SASS selection: NI-5 or 6 may be selected to provide total power to ICS
Periodicity to re calibrate to ensure power range NI are within 2% of actual heat balance
Each shift
