3.4 RCS

Question 1

3.4.1

Answer 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

Question 2

3.4.2

Answer 2

RCS Minimum Temp for criticality
Tc >/= 545F
Mode 1, Mode 2 Keff >/= 1

Question 3

3.4.3

Answer 3

RCS P/T Limits
Maintain within limits of PTLR
All modes (except when head is fully detensioned)

Question 4

3.4.4

Answer 4

RCS Loops
Two loops shall be operable and in operation
Modes 1 & 2

Question 5

Two RCS loops operable means

Answer 5

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.

Question 6

3.4.5

Answer 6

RCS Loops
Mode 3
Two loops operable and one loop in operation

Question 7

How long can an RCP be de-energized and still meet 3.4.5?

Answer 7

= 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.

Question 8

3.4.6

Answer 8

RCS Loops
Mode 4
2 loops consisting of RCS and SDC trains shall be operable and at least one loop/train shall be operating.

Question 9

When can you start an RCP for 3.4.6?

Answer 9

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.

Question 10

How many RCPs can you operate with Tc = 200F?

Answer 10

no more than 2.

Question 11

How many RCPs can you operate with Tc >200=500F?

Answer 11

no more than 3

Question 12

3.4.7

Answer 12

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%

Question 13

3.4.8

Answer 13

RCS Loops
Mode 5 - not filled
2 SDC trains operable and one operating

Question 14

3.4.9

Answer 14

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

Question 15

3.4.10

Answer 15

Pzr Safeties
4 safety valves operable and correctly set
Modes 1-3

Question 16

What’s the correct setting for the Pzr safeties?

Answer 16

2450.25-2549.25 psia

Question 17

3.4.11

Answer 17

Pzr safeties
Mode 4
One shall be operable at the correct set points (same as 3.4.10 settings)

Question 18

3.4.12

Answer 18

Pzr Vents
Modes 1-3 and 4 with RCS >/= 385 psia
Four vent paths operable

Question 19

3.4.13

Answer 19

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

Question 20

What does LTOP system Operable mean?

Answer 20

2 operable SDC suction line relief valves set = 467psig and aligned to RCS
OR
RCS depressurized and an RCS vent >/= 16 sq in.

Question 21

3.4.14

Answer 21

RCS Operational Leakage

Limited

Question 22

What are the TS acceptable leakages?

Answer 22

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

Question 23

3.4.15

Answer 23

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

Question 24

3.4.16

Answer 24

RCS Leakage Detection Instrumentation shall be operable

Modes 1-4

Question 25

What’s the RCS leak detection instrumentation?

Answer 25

One Containment Sump Monitor
and
One containment atmosphere monitor (gaseous and particulate)

Question 26

3.4.17

Answer 26

RCS activity
I-131 and XE-133 within limits
Modes 1-4

Question 27

3.4.18

Answer 27

S/G tube integrity maintained
AND tubes plugged IAW S/G program
Modes 1-4