LCO 3.4 Flashcards
(18 cards)
3.4.1
RCS Pressure, Temperature, and Flow Departure from Nucleate Boiling (DNB) Limits
Modes?
Specs?
Actions?
Modes 1-2 (N/A for 5% ramp or 10% step)
Pressurizer Pressure 2130-2295psia
Mode 1-2 (Keff greater than or equal to 1)
Tc Curve (0% <570 F, 100% <564 F)
Modes 1
Flow greater than or equal to 155.8x106 lbm/hr
2 hours to restore
3.4.2
RCS Minimum Temperature for Criticality
Spec?
Surveillance Requirement?
Actions?
Tc greater than or equal to 545 F (when critical)
M3 in 30 min (if not restored)
Surveillance Requirement: If <550 F, check greater than or equal to 545 F every 30 min.
- Verify w/in 30 min of criticality
Bases: instrument ranges, acc analysis, vessel above nil duct ref temp.
3.4.3
RCS Pressure and Temperature (P/T) Limits
Modes?
Actions?
Limits?
Modes 1-4 <30min
Other Modes - immediately restore
Cool Down Rate: Less than or equal to 30F/hr (if less than or equal to 100F)
Less than or equal to 100F/hr (>100k)
Heat Up Rate: Less than or equal to 75F/hr (N/A when head Fully detensioned)
3.4.4
RCS Loops - MODES 1 and 2
3.4.5
RCS Loops - MODE 3
LCO Requirements?
Operable Loop?
Actions?
2 loops operable and 1 in-service
Loop - 1 RCP and greater than or equal to 25% WR SGWL
1 loop inoperable- 72 hours
Both inoperable or none in-service- immediately stop dilutions and restore
3.4.6
RCS Loops - MODE 4
LCO Requirements?
Actions?
Required Flow Rate?
Two Loops or Trains Operable
One operating
(1 RCP and greater than or equal to 25% WR/ SDC greater than or equal to 4000 gpm)
A. One RCS and two SDC INOP - Immediately restore
B. One SDC INOP and two RCS INOP - Mode 5 in 24 hours
C. No loops operating or operable - Immediately stop dilution and restore
3.4.7
RCS Loops - MODE 5, Loops Filled
Loops filled vs not filled operability requirements?
Filled
(One SDC operating and second SDC train operable or Both SGs greater than or equal to 25% WR)
Not Filled
(Two SDC trains operable one operating (Cannot credit S/Gs))
SDC Flow greater than or equal to 3780 gpm
LPSI or CSP can be used
CSP cannot be used in mid-loop (<103’1”)
3.4.8
RCS Loops - MODE 5, Loops Not Filled
Loops filled vs not filled operability requirements?
Filled
(One SDC operating and second SDC train operable or Both SGs greater than or equal to 25% WR)
Not Filled
(Two SDC trains operable one operating (Cannot credit S/Gs))
SDC Flow greater than or equal to 3780 gpm
LPSI or CSP can be used
CSP cannot be used in mid-loop (<103’1”)
3.4.9
Pressurizer
Operability?
Applicability?
Bases?
LPZR 27-56% (N/A >5% ramp, >10% step) Both class heaters (B1/B) greater than or equal to 125KW
Bases: Bubble - Press Control Heaters covered Maintain RCS near NOP (Accounting for head loss) SCM (Press Control) during LOOP/SGTR
Level OOS - Mode 3 in 6 hrs
One HTR Inop - 72 hours
3.4.10
Pressurizer Safety Valves - Modes 1, 2 and 3
Modes?
Operability?
Actions?
Bases?
Modes 1-3 2475 psia (As Found -1%/+3%) (As Left +1% or -1%)
1 Inop - 15 Min LCO
Bases:
RCS Less than or equal to 110% design press
4 safeties assumed in accident analysis
3.4.11
Pressurizer Safety Valves - MODE 4
Modes?
Actions?
Mode 4 greater than or equal to 221 F
One Pressurizer Safety Valve
Action: Immediately be in Mode 4 with one SDC Suction relief in-service/operable (less than or equal to 467 psig)
8 hours - Cool Down <221F and place LTOP In-service
3.4.12
Pressurizer Vents
Modes?
Purpose?
LCO?
Mode 1-4 greater than or equal to 385 psia
(Four Paths (PZR to RDT or CNMT)
Required for design bases SGTR assumes no off-site and no Aux Spray.
Loss of one valve = 2 INOP paths
Actions:
2-3 path INOP - 72 hours
All paths INOP - Restore one in 6 hours
3.4.13
Low Temperature Overpressure Protection (LTOP) System
Modes?
LCO Requirement?
Bases (Worst Case)?
Mode 4 (Less than or equal to 221 F Tc), M5, M6 (Head On)
Two SDC Suction Reliefs (467 psig) or 16 in2 vent (All Safeties removed or PZR man way)
Most Limiting:
Start Idle RCP w/SG temp 100F above RCS Tc
Inadvertent SIAS - 2 HPSI when solid, 3 CH Pumps, letdown isolated
3.4.14
RCS Operational LEAKAGE
3.4.15
RCS Pressure Isolation Valve (PIV) Leakage
3.4.16
RCS Leakage Detection Instrumentation
Modes?
LCO Requirements?
Actions?
Modes 1-4
One CNMT Sump Monitor
(LTs, Flow alarms, Pump run time used for LCO)
One Rad Monitor (Gas AND Particulate)
RU-1
LT INOP - RCS Leak check daily (Restore in 30 days)
RU-1 INOP - Grab Sample or RCS Leak Check Daily (Restore in 30 days)
Both INOP - 3.0.3
3.4.17
RCS Specific Activity
Modes?
LCO Limits?
Actions?
Modes 1-4
OOS - Restore in 48 hours
Or
M3 - 6 Hours
M5 - 36 Hours
Bases:
SGTR (Limit Off-site /MCR Dose)
3.4.18
Steam Generator (SG) Tube Integrity
