3.4 RCS Flashcards
3.4.1
RCS DNB parameters for Ppzr, Tc, and RCS flowrate shall be within limits Mode 1 RCS total flow Modes 1 &2 Ppzr Mode 1 Tc Mode 2 w/Keff >/= 1 for Tc
3.4.2
RCS Minimum Temp for criticality
Tc >/= 545F
Mode 1, Mode 2 Keff >/= 1
3.4.3
RCS P/T Limits Maintain within limits of PTLR All modes (except when head is fully detensioned)
3.4.4
RCS Loops
Two loops shall be operable and in operation
Modes 1 & 2
Two RCS loops operable means
each operable loop has 2 RCPs providing forced flow to Operable steam generators. SG water level is ensured to be in the operable range by RPS in Modes 1 & 2.
3.4.5
RCS Loops
Mode 3
Two loops operable and one loop in operation
How long can an RCP be de-energized and still meet 3.4.5?
= 1 hour per 8 hour period provided No ops that would decrease Boron concentration and core outlet is kept at a minimum 10F below saturation temp.
3.4.6
RCS Loops
Mode 4
2 loops consisting of RCS and SDC trains shall be operable and at least one loop/train shall be operating.
When can you start an RCP for 3.4.6?
only if RCS cold leg temp is = LTOP enable temp unless the secondary side water temp in each S/G is <100F above each RCS cold leg temps.
How many RCPs can you operate with Tc = 200F?
no more than 2.
How many RCPs can you operate with Tc >200=500F?
no more than 3
3.4.7
RCS Loops
Mode 5 - Loops filled
One SDC train operable and operating AND either one other SDC train operable or secondary side of S/G water level >/= 25%
3.4.8
RCS Loops
Mode 5 - not filled
2 SDC trains operable and one operating
3.4.9
Pressurizer shall be operable with:
Lpzr between 27% and 56%
2 groups of Pzr htrs operable with capacity of each group >/= 125kW
modes 1-3
3.4.10
Pzr Safeties
4 safety valves operable and correctly set
Modes 1-3
What’s the correct setting for the Pzr safeties?
2450.25-2549.25 psia
3.4.11
Pzr safeties
Mode 4
One shall be operable at the correct set points (same as 3.4.10 settings)
3.4.12
Pzr Vents
Modes 1-3 and 4 with RCS >/= 385 psia
Four vent paths operable
3.4.13
LTOPs LTOP system shall be operable Mode 4 when Tc is less than LTOP enable set point Mode 5 Mode 6 with vessel head on
What does LTOP system Operable mean?
2 operable SDC suction line relief valves set = 467psig and aligned to RCS
OR
RCS depressurized and an RCS vent >/= 16 sq in.
3.4.14
RCS Operational Leakage
Limited
What are the TS acceptable leakages?
No pressure boundary leakage (does not include past seals and gaskets)
1 GPM unidentified
10 GPM Identified
150 GPD primary to secondary through any ONE S/G
3.4.15
RCS PIV leakage
Leakage from a pressure isolation valve shall be within limits
Modes 1-3 and 4 except SDC valves when in transition to and from SDC
3.4.16
RCS Leakage Detection Instrumentation shall be operable
Modes 1-4
What’s the RCS leak detection instrumentation?
One Containment Sump Monitor
and
One containment atmosphere monitor (gaseous and particulate)
3.4.17
RCS activity
I-131 and XE-133 within limits
Modes 1-4
3.4.18
S/G tube integrity maintained
AND tubes plugged IAW S/G program
Modes 1-4