Section 3.4 PRIMARY COOLANT SYSTEM Flashcards
What is T.S. 3.4.1 PCS Pressure, Temperature, and Flow Departure from Nucleate Boiling (DNB) Limits?
Any 1-hour or less actions?
T.S. 3.4.1 PCS Pressure, Temperature, and Flow Departure from Nucleate Boiling (DNB) Limits
Applicable Mode 1
PCS DNB parameters for pressurizer pressure, cold leg temperature, and
PCS total flow rate shall be within the limits specified in the COLR.
No 1-hour or less actions.
Total Flow 352,000 gpm. Trips at 96% of that flow.
What is T.S. 3.4.2 PCS Minimum Temperature for Criticality?
Any 1-hour or less actions statements?
T.S. 3.4.2 PCS Minimum Temperature for Criticality
Applicable MODE 1 and MODE 2 with Keff ≥ 1.0.
Each PCS loop average temperature (Tave) shall be ≥ 525°F.
Tave in 1 or more loops not within limits, be in Mode 2 with Keff < 1.0 in 30 minutes.
What is T.S. 3.4.3 PCS Pressure and Temperature (P/T) Limits?
Any 1-hour or less actions?
T.S. 3.4.3 PCS Pressure and Temperature (P/T) Limits
Applicable at ALL TIMES
PCS pressure, PCS temperature, and PCS heatup and cooldown rates
shall be maintained within the limits.
- In Modes 1-4, restore parameter with 30 minutes.
- In Modes 5 & 6 restore parameter immediately.
Heat UP
- <170F equals a rate of 20F/hour
- 170F to <= 250F equals a rate of 40F/hour
- >250F to <=350F equals a rate of 60F/hour unless on SDC, then 40F
- >350F equals a rate of 100F/hour
Cool Down
- 110F to 135F soak for 3 hours, then 20F/hour
- <170F equals a rate of 40F/hour
- 170F to <= 250F equals a rate of 40F/hour
- >250F to <=350F equals a rate of 60F/hour
- >350F equals a rate of 100F/hour
What is T.S. 3.4.4 PCS Loops - MODES 1 and 2?
Any 1-hour or less actions?
T.S. 3.4.4 PCS Loops - MODES 1 and 2
Applicable MODES 1 and 2.
Two PCS loops shall be OPERABLE and in operation.
No 1-hour or less actions.
What is T.S. 3.4.5 PCS Loops - MODE 3?
Any 1-hour or less actions?
T.S. 3.4.5 PCS Loops - Mode 3
Applicable Mode 3
Two PCS loops shall be OPERABLE and one PCS loop shall be in operation.
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1. All primary coolant pumps may not be in operation for ≤ 1 hour per 8 hour period, provided:
a. No operations are permitted that would cause reduction of the PCS boron concentration; and
b. Core outlet temperature is maintained at least 10°F below saturation temperature.
2. Forced circulation (starting the first primary coolant pump) shall not be initiated unless one of the following conditions is met:
a. PCS cold leg temperature (Tc) is > 430°F;
b. Steam Generator (SG) secondary temperature is equal to or less than the reactor inlet temperature (Tc);
c. SG secondary temperature is < 100°F above Tc, and shutdown cooling is isolated from the PCS, and PCS heatup/cooldown rate is ≤ 10°F/hour; or
d. SG secondary temperature is < 100°F above Tc, and shutdown cooling is isolated from the PCS, and pressurizer level is ≤ 57%.
No PCS Loop Operable or No PCS Loop in Operation; IMMEDIATELY suspend dilution operations and initiate actions to restore to operating/operable.
What is T.S. 3.4.6 PCS Loops - MODE 4?
Any 1-hour or less actions?
T.S. 3.4.6 PCS Loops - MODE 4
Applicable Mode 4
- Two loops or trains consisting of any combination of PCS loops and Shutdown Cooling (SDC) trains shall be OPERABLE, and either:
a. One PCS loop shall be in operation; or
b. One SDC train shall be in operation with ≥ 2810 gpm flow through the reactor core.
1 PCS Loop and both SDC trains inoperable, IMMEDIATELY begin actions to restore a PCS Loop or SDC train to OPERABLE status.
No PCS Loops or SDC trains operable, IMMEDIATELY suspend dilutions and either restore a PCS Loop or SDC flow to > 2810 gpm.
What is T.S. 3.4.7 PCS Loops - MODE 5, Loops Filled?
Any 1-hour or less actions?
T.S. 3.4.7 PCS Loops - MODE 5, Loops Filled
Applicable Mode 5 with PCS Loops Filled
One Shutdown Cooling (SDC) train shall be OPERABLE and in operation with ≥ 2810 gpm flow through the reactor core, and either:
a. One additional SDC train shall be OPERABLE; or
b. The secondary side water level of each Steam Generator (SG) shall be ≥ -84%
1-Hour or Less
- One SDC train inoperable AND Any SG with secondary side water level not within limit - IMMEDIATELY restore a 2nd SDC train or raise SG water levels
- Two SDC trains inoperable OR SDC flow thru core not within limit, IMMEDIATELY suspend dilution activities and initiate actions to restore SDC train to OPERABLE with flow greater than 2810 gpm.
What is T.S. 3.4.8 PCS Loops - MODE 5, Loops Not Filled?
Any 1-hour or less actions?
T.S. 3.4.8 PCS Loops - MODE 5, Loops Not Filled
Applicable in Mode 5 with loops not filled.
Two Shutdown Cooling (SDC) trains shall be OPERABLE, and either:
a. One SDC train in operation with ≥ 2810 gpm flow through the reactor core; or
b. One SDC train in operation with ≥ 650 gpm flow through the reactor core with two of the three charging pumps incapable of reducing the boron concentration in the PCS below the minimum value necessary to maintain the required SHUTDOWN MARGIN.
1-hour or less
- 1 SDC Train inoperable, IMMEDIATELY initiate action to restore to operable.
- 2 SDC Trains inoperable or SDC flow not in limits, IMMEDIATELY suspend dilution operations AND restore 1 train to operable with flow within limit.
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What is T.S. 3.4.9 Pressurizer?
Any 1-hour or less actions?
T.S. 3.4.9 Pressurizer
Applicable Modes 1,2 and 3
The pressurizer shall be OPERABLE with:
a. Pressurizer water level < 62.8%;
———————————————NOTE——————————————-
The pressurizer water level limit does not apply in MODE 3 until after a bubble has been established in the pressurizer and the pressurizer water level has been lowered to within its normal operating band.
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b. ≥ 375 kW of pressurizer heater capacity available from electrical bus 1D, and
c. ≥ 375 kW of pressurizer heater capacity available from electrical bus 1E with the capability of being powered from an emergency power supply.
What is T.S. 3.4.10 Pressurizer Safety Valves?
Any 1-hour or less actions?
T.S. 3.4.10 Pressurizer Safety Valves
Applicable MODES 1 and 2, MODE 3 with all PCS cold leg temperatures ≥ 430°F.
Three pressurizer safety valves shall be OPERABLE with lift settings as specified.
1-hour or less
1 pressurizer safety valve inoperable, restore to OPERABLE in 15 minutes.
SETPOINTS
+- 3 psia of 2500, 2540 or 2580 psia.
What is T.S. 3.4.11 Pressurizer Power Operated Relief Valves (PORVs)?
Any 1-hour or less actions?
T.S. 3.4.11 Pressurizer Power Operated Relief Valves (PORVs)
Applicable MODES 1 and 2, MODE 3 with all PCS cold leg temperatures >=430F
Each PORV and associated block valve shall be OPERABLE.
1-hour or less
- PORV inoperable, close associated block valve within 1 hour
- Block valve inoperable, place associated PORV in manual within 1 hour
- Do the same if its both PORVs or both Block Valves.
What is T.S. 3.4.12 Low Temperature Overpressure Protection (LTOP) System?
Any 1-hour or less actions?
T.S. 3.4.12 Low Temperature Overpressure Protection (LTOP) System
Applicable MODE 3 when any PCS cold leg temperature is < 430°F, MODES 4 and 5, MODE 6 when the reactor vessel head is on.
An LTOP System shall be OPERABLE with:
a. Both High Pressure Safety Injection (HPSI) pumps incapable of
injecting into the PCS, and
——————————————NOTES—————————————–
1. LCO 3.4.12.a is only required when any PCS cold leg temperature is < 300°F.
2. LCO 3.4.12.a does not prohibit the use of the HPSI pumps for emergency addition of makeup to the PCS.
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b. One of the following pressure relief capabilities:
1. Two Power Operated Relief Valves (PORVs) with lift settings as specified in Figure 3.4.12-1; or
2. The PCS depressurized and a PCS vent capable of relieving >= 167 gpm at a pressure of 315 psia.
1-Hour or Less
Immediately initiate action to verify no HPSI pump can inject into PCS when One or two HPSI pumps capable of injecting into the PCS.
What is T.S. 3.4.13 PCS Operational LEAKAGE?
Any 1-hour or less actions?
T.S. 3.4.13 PCS Operational LEAKAGE
Applicable MODES 1, 2, 3, and 4.
PCS operational LEAKAGE shall be limited to:
a. No pressure boundary LEAKAGE;
b. 1 gpm unidentified LEAKAGE;
c. 10 gpm identified LEAKAGE; and
d. 150 gallons per day primary to secondary LEAKAGE through any
one steam generator (SG).
No 1-hour or less
What is T.S. 3.4.14 PCS Pressure Isolation Valve (PIV) Leakage?
Any 1-hour or less actions?
T.S. 3.4.14 PCS Pressure Isolation Valve (PIV) Leakage
Applicable MODES 1, 2, and 3, MODE 4, except during the SDC mode of operation, or transition to or from, the SDC mode of operation.
Leakage from each PCS PIV shall be within limits and both Shutdown Cooling (SDC) suction valve interlocks shall be OPERABLE.
No 1-hour or less actions.
What is T.S. 3.4.15 PCS Leakage Detection Instrumentation?
Any 1-hour or less actions?
T.S. 3.4.15 PCS Leakage Detection Instrumentation
Applicable MODES 1, 2, 3, and 4.
Three of the following PCS leakage detection instrumentation channels shall be OPERABLE:
a. One containment sump level indicating channel;
b. One containment atmosphere gaseous activity monitoring channel;
c. One containment air cooler condensate level switch channel;
d. One containment atmosphere humidity monitoring channel.
All required channels inoperable, IMMEDIATELY enter LCO 3.0.3
