Power distribution monitoring system Flashcards
Inputs to PDMS (7)
Core Exit Temperatures (CETCs)
RCS cold leg temperatures - NR and WR
Control Bank position - Demand and DRPI
Nuclear Power - Calorimetric and NIS
Excore Power Range detector outputs (normalized currents and calculated AFD)
Pressurizer pressure
Reactor makeup flows (PW and BA)
What does the PDMS inoperable alarm mean?
Beacon Inoperable
Initiate BOL3.h for actions to be performed w/in 12 hours 3.2.1, 3.2.2, 3.2.4.
What does the PDMS limit exceeded mean?
Exceeded limit for DNBR, FNDeltaH or FqZ, go to BOA PD-1
What does PDMS limit warning mean?
Within 2% of COLR limit for DNBR, FndeltaH or hot flux channel factor margin, go to BOA PD-1.
How many CET channels are required for PDMS? How many per quadrant?
> =17 with >=2 per core quadrant
Details about RCS cold leg temp inputs:
> =2 loops must have an operable Tc (NR or WR). Must be within 4F of average.
If ______ is above _____, PDMS is inoperable.
Tavg; saturation
For control rod position into PDMS, _____ is the primary input and _____ is the backup.
Control bank demand is primary
DRPI is backup
For reactor power input to PDMS, _____ is normally used.
If lost, _____ is used.
1 minute calorimetric
Power range NI average
Color coding for status of inputs to PDMS:
Green=
Yellow=
Red=
Green TS satisfied
Yellow <2% of TS limit
Red Exceeding TS limit
If PDMS is inop, the ______ tech spec is not applicable because it is covered by _______.
DNBR, 3.2.5
3.1.6, 3.2.1, 3.2.2, 3.2.4
- Which of the Power Distribution Limit Tech Specs are in effect when Beacon is OPERABLE and reactor power is 100%?
TS 3.2.1 Heat Flux Hot Channel Factor
TS 3.2.2 Nuclear Enthalpy Rise Hot Channel Factor
TS 3.2.5 Departure from Nucleate Boiling Ratio (DNBR)
- Which of the Power Distribution Limit Tech Specs are in effect when Beacon is INOPERABLE and reactor power is 100%?
TS 3.2.1 Heat Flux Hot Channel Factor
TS 3.2.2 Nuclear Enthalpy Rise Hot Channel Factor
TS 3.2.4 Quadrant Power Tilt Ratio (QPTR)
