C41 - SLC

Question 1

How is SLC initiated?

Answer 1

No automatic initiation (manual with control room key switches)

Question 2

Where does SLC enter the Rx?

Answer 2

through HPCS sparger

Question 3

What’s the tech spec limit for the SLC tank level?

Answer 3

4,200 gallons

Question 4

What’s the flow rate of SLC pumps?

Answer 4

41.2 gpm per pump @ 1370 psig

Question 5

Ho does a squib valve operate?

Answer 5

Leak tight explosive valve that provides highly reliable way to test SLC system at a high pressure without leakage into the Rx.

Question 6

Where are the SLC storage tank heaters controlled from?

Answer 6

Locally with handswitch

Question 7

What are the power supplies to the SLC suction valves, squib valves, and pumps?

Answer 7

A - 15

B - 16

Question 8

How are the suction valves operated?

Answer 8

Local handswitch or on initiation

Question 9

When will the suction valves not auto open on initiation?

why?

Answer 9

When test tank outlet valve F031 is not fully closed

this is to prevent inadvertent contamination of SLC test tank with sodium pentaborate from storage tank

Question 10

What does service air do for SLC?

Answer 10

Goes through spargers for agitation and MIXING chemical or when required for sampling

Question 11

What does instrument air do for SLC?

Answer 11

Admits air into flow indicator for level indication (bubbler system)

Question 12

Describe the initiation of SLC system

Answer 12

1. Squib valves fire
2. F001 A/B (suction valves) open
3. Isolates RWCU ‘A’ pump G33-F004 close
   ‘B’ pump and G33-F001 and G33-F251 close

Pump starts (All previous actions happen simultaneously. When suction valve is full open, then pump starts)
*if test tank outlet valve F031 is not full closed, suction will not auto open*