TS 3.4.1 RCS Pressure, Temperature, and Flow DNB Limits

Question 1

LCO 3.4.1 RCS DNB Parameters for PZR Pressure, cold leg temperature, and RCS total flow rate shall be within the limits specified below:

a. PZR Pressure ___
b. RCS Cold Leg temperature ___
c. RCS total flow rate ___

Answer 1

a. 2130 psia to 2295 psia
b. …Tc shall be within area of acceptable ops shown in Figure 3.4.1-1
c. > 155.8 E6 lbm/hour

Question 2

LCO 3.4.1 APPLICABILITY
RCS Total Flow Rate ___
PZR Pressure ___
RCS Tcold ___

Answer 2

Flow = MODE 1
PZR Pressure = MODES 1 and 2
Tcold = MODE 1 (and MODE 2 with Keff >1)

Question 3

LCO 3.4.1

APPLICABILITY - NOTE ___

Answer 3

NOTE
PZR Pressure limit does NOT apply during:
a. THERMAL POWER ramp >5% RTP/minute
b. THERMAL POWER step >10% RTP

Question 4

LCO 3.4.1 Bases address requirements for maintaining RCS pressure, temperature, and flow rate within limits assumed in the ___

Answer 4

Safety Analyses

Question 5

In MODES 1 and 2 for these parameters, the limits must be maintained during steady state ops in order to ensure that DNBR criteria will be met in event of unplanned LOFC or other DNB limited transient. In all other MODES, the power level is low enough so that ___

Answer 5

…DNBR is NOT a concern

Question 6

LCO 3.4.1 CONDITION

A. RCS flow rate not within limit

Answer 6

A.1 Restore RCS flow rate to within limit (2 hours)

Question 7

RCS flow rate is not a controllable parameter and is not expected to vary during steady state ops. If the flow rate is not within the LCO limit, then ___

Answer 7

…power must be reduced, as required by Required Action B.1, to restore DNB margin…

Question 8

LCO 3.4.1 CONDITION

B. Required Action and associated Completion Time of Condition A not met.

Answer 8

B.1 Be in MODE 2 (6 hours)

Question 9

LCO 3.4.1 CONDITION

C. PZR Pressure or RCS cold leg temperature not within limits.

Answer 9

C.1 Restore parameter(s) within limits (2 hours)

Question 10

LCO 3.4.1 CONDITION

D. Required Action and associated Completion Time of Condition C not met.

Answer 10

D.1 Be in MODE 3 (6 hours)

Question 11

LCO 3.4.1 Figure 3.4.1-1
Tcold Minimum ___
Tcold Maximum ___

Answer 11

MIN - (0% to 100% is always 550 F per 3.4.1)

MAX - (at 0% 570F, ramping down to 100% 564F)