Containment Spray

Question 1

CS add tank empty alarm:

Answer 1

Empty alarm and 125VDC status lights at 11.0%

Question 2

To close CS019s spray add to eductor valve:

Answer 2

Reset CS signal

Manually close CS019s

Question 3

Formula for keeping iodine in solution

Answer 3

I2 + 2OH- =>I- + IO- +H2O

Question 4

Operation design basis:

Answer 4

System designed to deliver:

1. Between 30-36% by weight NaOH solution to form a 8.0-10.5 pH solution when combined with RCS leakage and all RWST water. pH control minimizes effect of chloride and caustic stress corrosion.
2. System will satisfy design requirements with one eductor and both CS pumps operable.

Question 5

Safety design basis:

Answer 5

1. Reduce pressure in containment atmosphere at a rate to prevent exceeding design leak rate.
2. Removed sufficient iodine from containment atmosphere to limit site and offsite boundary doses below CFR requirements.
3. Components (except test/recirculating lines) are safety Cat 1 and quality group B.
4. Components protected from missiles that could be generated by a LOCA.
5. Ring header and risers are designed for Safe Shutdown earthquake.

Question 6

The Hi-3 bistables for CS are ______to actuate to prevent inadvertent CS actuation on a _______to the bistable. These are _______by taking the bistable to _______. If one is bypassed, coincidence changes from ____ to _____.

Answer 6

Energized
Loss of power
Bypassed
Test
2/4
2/3

Question 7

Swap CS pump suctions from ______ to _______ at RWST level of _____. Secure pumps if RWST is ______.

Answer 7

RWST to Containment sump
12%
9% and still the suction source

Question 8

pH control minimizes the effect of _____ and ______ corrosion.

Answer 8

Chloride and caustic stress corrosion

Question 9

Design flow of A CS pump is ______ and B CS pump is _____with containment pressure of ______.

Answer 9

3415 GPM
3925 GPM
50 psig

Question 10

CS010A/B is the ______ and auto opens on a _______. This valve fails _____on loss of IA.

Answer 10

Eductor isolation valve; CSAS signal

Fails open on loss of IA

Question 11

CS019A/B are the _____ and auto open on ______. These are _____ operated valves. Flow rate from the spray add tank is approximately ______.

Answer 11

Spray add tank isolations
CSAS
Motor
55-60 GPM

Question 12

CS007A and B are the _______ and auto open on ______.

Answer 12

Containment spray isolations going to containment

CSAS signal

Question 13

If either CS007A/B or CS019A/B are not open within _______ of ________, an alarm will sound in the _____.

Answer 13

30 seconds
CSAS
MCR

Question 14

Initiation of CS signal, what happens? 4 items

Answer 14

1. CS007A/B opens
2. CS019A/B open
3. CS pumps start only when the CS019A/B valves are open
4. CS010A/B gets a confirmatory open signal

Question 15

CS actuation signals:

Answer 15

1. Cntmt Hi-3 pressure (>20# 2/4)

2. Manual (2/2 @ 1/2 locations)

Question 16

CS termination criteria

Answer 16

1. Containment pressure <15 psig

2. RCS LOCA only: Operating >8 hours -and- Spray tank Lo-2 lights lit. (11%)

Question 17

Conditions for CS pump to auto start

Answer 17

1. CS in after trip or after close
2. CS019A/B open spray add isolation
3. CSAS signal

Question 18

To manually start CS pump

Answer 18

1. CS to close
2. CS009A/B open
3. SI8811A/B open

Question 19

LCO 3.6.6

Answer 19

3.6 CONTAINMENT SYSTEMS
3.6.6 Containment Spray and Cooling Systems
LCO 3.6.6 Two containment spray trains and two containment cooling
trains shall be OPERABLE.
APPLICABILITY: MODES 1, 2, 3, and 4.

Question 20

Spray add tank parameters per 3.6.7

Answer 20

> =78.6% and <= 90.3%
Verify spray additive tank sodium hydroxide
solution concentration is >=30% and <= 36%
by weight.

Valves in flowpath locked or secured in correct position
and go to correct auto position on an actual or simulated signal.

Question 21

CS007A/B can not be opened unless_______.

Answer 21

Pump breaker has been open for >30 seconds

Question 22

Which panel in MCR can CSAS be reset?

Answer 22

PM05J

Question 23

If CSAS was reset at 25 psig, auto CSAS is blocked. What rearms CSAS?

Answer 23

Going below 20 psig will rearm

Question 24

CS Pump Test Start?

Answer 24

_CS007A/B Spray Hdr Isol closed
_SI001A/B RWST open
CS040A/B Spray Add Tk Isol closed

Question 25

How can _CS019A/B be manually opened? Auto opened?

Answer 25

Switch to TEST and C/S to open

Auto opens on CSAS Signal

Question 26

If 1CS007A is INOPERABLE, what Tech Spec(s) apply?

Answer 26

LCO 3.6.3 Condition A and LCO 3.6.6 Condition A.

Question 27

Eductor flow rate is _______ and is/is not included in the total flow from each pump. Each spray nozzle delivers _____ gpm.

Answer 27

130 GPM and is included

15 GPM

Question 28

If CS-019A/B inop, TSAC ____ and _____ because spray add wont function and CS pump wont start because of interlock.

If CS-010A/B inop, TSAC______ because spray add wont work.

If CS007A/B inop, TSAC ____ and _____ because isolation valve and only the support system inop.

Answer 28

3. 6.6 and 3.6.7
4. 6.7
5. 6.3 and 3.6.6

Question 29

List required components of CS system

Answer 29

2 pumps
1 Spray Additive Tank
2 eductors
6 spray rings and associated nozzles
2 containment recirc sumps
1 Refueling Water Storage Tank
Piping and associated valves

Question 30

List the following flow rates during system operation:

a) Spray headers, b) Pump discharge flow to eductor, c) NaOH to eductor.

Answer 30

a) Spray headers: Train A 3285; Train B 3795
b) Pump discharge flow to eductor 130 gpm (each)
c) NaOH to eductor 55 gpm (each Train)

Question 31

The Containment Spray System has six spray rings. Which rings belong to Train A and Train B?

Answer 31

Train A = rings 1, 3, 5

Train B = rings 2, 4, 6