3.4 Reactor Coolant System Flashcards
3.4.1 RCS Pressure, Temp and Flow (DNB Limits)
- NOTE -
Pressurizer pressure limit does not apply during:
a. THERMAL POWER ramp > 5% RTP per minute, or
b. THERMAL POWER step > 10% RTP.
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a. Pressurizer ≥ COLR (2209 psig)
b. Tavg ≤ COLR (580.3 °F)
c. RCS Flow ≥ 301,670 gpm
APPLICABILITY: MODE 1
ACTIONS
One or more parameters not within limit, restore within 2 hours or be in MODE 2 within the next 6 hours
3.4.2 Minimum Temperature for Criticality
Each RCS loop average temperature (Tavg) shall be ≥ 551°F.
APPLICABILITY: MODE 1 and MODE 2 with keff ≥ 1.0.
ACTIONS
One or more loops not above limit, be in MODE 2 with Keff <1.0 within 30 minutes.
3.4.3 RCS Pressure and Temperature (P/T) Limits
- NOTE -
No reactor coolant pump (RCP) shall be started with any RCS cold leg
temperature ≤ 350°F unless the secondary side water temperature of
each steam generator is ≤ 50°F above each of the RCS cold leg
temperatures and the RCP is started at ≤ 25% of rated RCP speed.
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Maintain RCS Pressure, temperature and RCS heatup/cooldown rates within limits of PTLR
APPLICABILITY: At all times
ACTIONS
A Restore parameters to limits with 30 minutes AND determine RCS is acceptable for continued operation within 72 hours
Required actions not met, be in MODE 3 within 6 hours and MODE 5 within 36 hours
C. Required parameters not within limits in MODE 5, 6 or defueled….immediately initiate action to restore and determine RCS is acceptable for continued operation prior to entering MODE 4
3.4.4 RCS Loops
- NOTE -
All RCPs may be removed from operation in MODE 3, 4, or 5 for ≤ 1 hour
per 8 hour period provided:
a. No operations are permitted that would cause introduction into the
RCS, coolant with boron concentration less than required to meet
the SDM of LCO 3.1.1; and
b. Core outlet temperature is maintained at least 10°F below saturation
temperature.
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2 Loops OPERABLE and 4 RCPs in operation with the VFD bypassed
APPLICABILITY: MODES 1 and 2…and MODES 3, 4, and 5 with PLS capable of rod withdrawal or 1+ rods not fully inserted
ACTIONS
A. Not met in MODE 1 or 2 (must complete all actions)
Suspend start of any RCP (Immediately) AND
BE in MODE 3 within 6 hours AND
Initiate action to fully insert all rods within 6 hours AND
Make PLS incapable of rod withdrawal within 6 hours
B Not met in MODE 3,4,or5 (must complete all actions)
Suspend start of any RCP (immediately) AND
Initiate action to fully insert all rods within 1 hour AND
Make PLS incapable of rod withdrawal within 1 hour
3.4.5 Pressurizer
Pressurizer Water level shall be ≤ 92%
APPLICABILITY: MODES 1, 2, 3, and MODE4 with all 4 cold leg temps > 275°F.
ACTIONS
Not within limit
Be in MODE 3 within 6 hours AND
Initiate actions to fully insert all rods within 6 hours AND
Make PLS incapable of rod withdrawal within 6 hours AND
Be in MODE 4 with at least one cold leg temp ≤ 275°F within 24 hours.
3.4.6 Pressurizer Safety Valves
2 Safety Valves OPERABLE w/lift settings ≥2460 psig and ≤2510 psig
APPLICABILITY: MODES 1, 2, 3, and MODE4 with all 4 cold leg temps > 275°F.
- NOTE -
The lift settings are not required to be within the LCO limits during
MODES 3 and 4 for the purpose of setting the pressurizer safety valves
under ambient (hot) conditions. One pressurizer safety valve at a time
may be inoperable for hot lift setting adjustment.
This exception is allowed for 36 hours following entry into MODE 3,
provided a preliminary cold setting was made prior to heatup.
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ACTIONS
1 valve inoperable, restore valve to OPERABLE status within 15 minutes
Required completion time above is not met or 2 valves are inoperable
Be in MODE 3 within 6 hours AND
Be in MODE 4 with at least one cold leg temp ≤ 275°F within 24 hours.
3.4.7 RCS LEAKAGE
RCS operational LEAKAGE shall be limited to:
a. No pressure boundary LEAKAGE,
b. 0.5 gpm unidentified LEAKAGE,
c. 10 gpm identified LEAKAGE from the RCS,
d. 150 gallons per day primary to secondary LEAKAGE through any
one Steam Generator (SG), and
e. 500 gallons per day primary to In-Containment Refueling Water
Storage Tank (IRWST) LEAKAGE through the passive residual heat
removal heat exchanger (PRHR HX).
APPLICABILITY: MODES 1, 2, 3, and 4.
Actions
A. Not within limits (other than pressure boundary or primary to secondary leakage) restore within 4 hours
Action A not met or pressure boundary or primary to secondary leakage exceeds limits, Be in MODE 3 within 6 hours AND
MODE 5 within 36 hours
3.4.8 Minimum RCS Flow
- NOTE -
a. All RCPs may be removed from operation for ≤ 1 hour per 8 hour
period for the purpose of testing; or
b. With no RCPs in operation, an unborated water source through the
chemical mixing tank may be unisolated under administrative
controls for ≤ 1 hour for the purpose of chemical addition to the
pressurizer;
provided:
i. No operations are permitted that would cause introduction into
the RCS, coolant with boron concentration less than required to
meet the SDM of LCO 3.1.1; and
ii. Core outlet temperature is maintained at least 10°F below
saturation temperature.
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At least 1 RCP in operation with a total flow ≥ 3,000 gpm.
APPLICABILITY: MODES 3, 4, and 5 with unborated water sources not isolated from RCS
ACTIONS
No RCP in operation
Isolate all unborated water sources and perform a SDM within 1 hour
3.4.9 RCS Leakage Detection Instrumentation
Following Instruments OPERABLE
2 containment sump level channels AND
The containment atmosphere F18 particulate monitor
- NOTES -
1. The following RCS leakage detection instrumentation is not required
to be OPERABLE provided SR 3.4.7.1 is performed once per
24 hours after 12 hours of steady state operation:
a. The required containment sump level channels when
In-containment Refueling Water Storage Tank (IRWST) gutter
drain isolation valves are closed and for 2 hours after reopening
IRWST gutter drain isolation valves; and
b. The containment atmosphere F18 particulate monitor and
required containment sump level channels when containment
purge flow path is open and for 2 hours after containment purge
flow path is closed.
2. The containment atmosphere F18 particulate monitor is only
required to be OPERABLE in MODE 1 with THERMAL POWER
> 20% RTP.
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A. One containment sump channel INOP, restore within 14 days.
B. Two containment sump channels INOP, restore one within 72 hours and perform leakrate 1x/24 hours
C. Particulate monitor INOP, Analyze grab samples of containment atmosphere 1x/24 hours OR
Perform leakrates 1x/24 hours AND restore the particulate monitor within 30 days.
D. Required actions of A, B. or C not met, Be in MODE 3 within 6 hours and MODE 5 within 36 hours.
E. ALL monitors INOP = 3.0.3
3.4.10 RCS Specific Activity
Within limits
APPLICABILITY: MODES 1, 2 and 3 with RCS Tavg ≥ 500°F
ACTIONS
A. DEI(131) >1.0 μCi/gm, Verify DEI ≤ 60 μCi/gm 1x/per 4 hours AND
RESTORE DEI to within limits within 48 hours
B. DEXe133 > 280 μCi/gm, Be in MODE 3 with Tavg< 500°F within 6 hours.
C. Times in A not met, or DEI >60 μCi/gm, Be in MODE 3 with Tavg < 500°F within 6 hours.
3.4.11 ADS - OPERATING
Ten ADS flow paths shall be OPERABLE
APPLICABILITY: MODES 1, 2, 3, and 4
ACTIONS
A. One flow path in ADS stage 1, 2, or 3 inoperable.
A.1 Restore to OPERABLE within 7 days
B. One flow path in stage 4 inoperable
B.1 Restore to OPERABLE within 72 hours
C. One flow path in stage 1 and one flow path in stage 2 or 3 (OR 2 flow paths in stage 1) INOPERABLE
C.1 Restore to Operable within 72 hours
D. Required action/completion time of A, B, or C not met OR condition A and B entered concurrently OR three or more flow paths in stage 1, 2, or 3 inoperable OR LCO not met for reasons other than A, B, or C
D.1 and 2 BE in MODE 3 within 6 hours and MODE 5 within 36 hours.
3.4.12 ADS - Shutdown, RCS INTACT
A. With reactor subcritical for < 28 hrs:
1. Five flow paths in ADS stage 1, 2, and 3 shall be OPERABLE;
and
2. Four flow paths in ADS stage 4 shall be OPERABLE
B. With reactor subcritical for ≥ 28 hrs:
1. Three flow paths in ADS stage 1, 2, and 3, with a minimum of
two flow paths in ADS stage 2 or 3, shall be OPERABLE; and
2. Three flow paths in ADS stage 4 shall be OPERABLE
APPLICABILITY: MODE 5 with RCS intact and pressurizer ≥ 20%.
ACTIONS
A. One flow path in ADS stage 1, 2, or 3 inoperable.
A.1 Restore to OPERABLE within 7 days
B. One flow path in stage 4 inoperable
B.1 Restore to OPERABLE within 72 hours
C. One flow path in stage 1 and one flow path in stage 2 or 3 (OR 2 flow paths in stage 1) INOPERABLE
C.1 Restore to Operable within 72 hours
D. Required action/completion time of A, B, or C not met OR condition A and B entered concurrently OR three or more flow paths in stage 1, 2, or 3 inoperable OR LCO not met for reasons other than A, B, or C
D.1 Initiate action to open RCS pressure boundary IMMEDIATELY
3.4.13 ADS - Shutdown, RCS OPEN
A. With reactor subcritical for < 28 hrs:
1. Five flow paths in ADS stage 1, 2, and 3 shall be open; and
2. Four flow paths in ADS stage 4 shall be OPERABLE.
B. With reactor subcritical for ≥ 28 hrs:
1. Three flow paths in ADS stage 1, 2, and 3, with a minimum of
two flow paths in ADS stage 2 or 3, shall be open; and
2. Three flow paths in ADS stage 4 shall be OPERABLE.
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- NOTE -
In MODE 5, required flow paths in ADS stage 1, 2, and 3 may be closed
provided they meet OPERABILITY requirements of LCO 3.4.12, ADS –
Shutdown, RCS Intact, for the following:
a. To facilitate RCS vacuum fill operations until a pressurizer level of
≥ 20% is established; or
b. To facilitate LCO compliance during transitions between LCO 3.4.12
and LCO 3.4.13.
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APPLICABILITY: MODE 5 with pressurizer level < 20%,
MODE 5 with RCS pressure boundary open,
MODE 6 with upper internals in place.
ACTIONS
A. One flow path in ADS stage 1, 2, AND 3 not open
A.1 Restore within 72 hours OR open alternative flow path with equivalent area within 72 hours.
B. One flow path in stage 4 inoperable
B.1 Restore to OPERABLE within 36 hours OR open alternative flow path with equivalent area within 36 hours
C. Required action/completion times of A or B not met in MODE 5 OR Condition A and B entered concurrently in MODE 5 or LCO not met for reasons other than A or B in MODE 5
C.1 Initiate action to fill the RCS to ≥ 20% pressurizer level AND suspended positive reactivity addition AND initiate action to VENT RCS IMMEDIATELY.
D. Required action/completion times of A or B not met in MODE 6 OR Condition A and B entered concurrently in MODE 6 or LCO not met for reasons other than A or B in MODE 6
D.1 Initiate action to remove upper internals IMMEDIATELY and suspended positive reactivity addition IMMEDIATELY
3.4.14 Low Temp Overpressure Protection (LTOP)
Following LTOP OPERABLE
TWO RNS suction relief valves and CVS makeup line containment isolation valve (CVS-V091) closed OR
the RCS depressurized and vented through ≥ 4.15 square inches.
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- NOTE -
Accumulator isolation is only required when accumulator pressure is
greater than or equal to the maximum RCS pressure for the existing RCS
cold leg temperature allowed by the P/T limit curves provided in the
PTLR.
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APPLICABILITY: MODE 4 with any cold leg temp ≤ 275°F, MODE 5 or MODE 6 with the head on
ACTIONS
A. Accumulator not isolated when pressure ≥ the maximum RCS pressure for existing cold leg temp per PTLR.
A.1 Isolate affected accumulator within 1 hour.
B. If RCS is not vented with ≥ 4.15 sq in hole and CVS-V091 not closed
B.1 Close valve within 1 hour
C Required action time of A not met
C.1 Raise cold leg temp or lower pressure to reach acceptable point on PTLR within 12 hours
D. LTOP INOP for reasons other than A, B, or C
D.1 Restore 2 RNS suction relief valves or depressurize and vent within 12 hours.
3.4.15 RCS Pressure Isolation Valve (PIV) Integrity
Leakage from PIVs shall be within limit.
APPLICABILITY: MODE 1, 2, 3, and 4 with RCS not cooled by RNS
ACTIONS
- NOTES -
1. Separate Condition entry is allowed for each flow path.
2. Enter applicable Conditions and Required Actions for systems made inoperable by an
inoperable PIV.
A. Leakage above limit
A.1 - NOTE -Each valve used to satisfy Required Action A.1 and Required Action A.2 must have been verified to meet SR 3.4.15.1 and
be in the reactor coolant pressure boundary or the high pressure portion of the system.
Isolate the high pressure portion from the low pressure by at least one closed manual, deactivated automatic, or check valve with 8 hours AND
A.2 Verify a second PIV can meet the leakage limits (valve required to be a check valve or closed valve if it isolates a line that penetrates containment) within 72 hours
B. Times not met, be in MODE 3 in 6 hours and MODE 5 within 36 hours.
