LCO 3.5

Question 1

3.5.1
Safety Injection Tanks (SITs) - Operating

Modes?
Operability Requirements?

Answer 1

Modes 1-4 (greater than or equal to 1837)

2300-4400 ppm
28%-72% NR level
600-625 psig N2

MOV open/de-energized

Question 2

3.5.2
Safety Injection Tanks (SITs) - Shutdown

Modes?
Operability Requirements?

Answer 2

Modes 3 and 4 (<1837 psia)

MOV open greater than or equal to 430 psia
De-energized greater than or equal to 1500 psia
2300-4400 ppm
260-625 psia

4 operable SITs
>39% - <89% WR
3 operable SITs
>50% - <83% WR

Question 3

3.5.3
ECCS - Operating

Modes?
Times?
Basis?

Answer 3

Modes 1-3 (greater than or equal to 1837 psia or Tc greater than or equal to 485 F)
Two Trains (HPSI/LPSI)

One LPSI - 7 day LCO
1 Train (Equivalent) - 72 hr LCO

485 F - M3 SLB/Stuck CEA/Single HPSI Failure= Prevent return to power
LOCA - Assumes no flow until HPSI Shutoff (1776 - 1962 psi)

Some HPSI aligned to hot legs (2-3 hrs post LOCA)
- Core cooling/boric acid flushing

Question 4

3.5.4
ECCS - Shutdown

Modes?
Actions?
Notes?

Answer 4

Mode 3 <1837 psia and <485 F
One HPSI Train

Not met - Restore 1 hr

3.0.4.b Not applicable

Question 5

3.5.5
Refueling Water Tank (RWT)

Modes?
Bases?

Answer 5

Modes 1-4

Bases:
ESF Reserve Volume ensures that the ESF Pump suction will not be aligned to the containment sump until the point at which 75% of the minimum design flow of one HPSI pump is capable of meeting or exceeding the decay heat boil-off rate.

Question 6

3.5.6

Answer 6

Trisodium Phosphate (TSP)