ASS/ABS

Question 1

What loads can be supplied by the Aux Boilers?

Answer 1

• SJAE
• OFG Preheaters
• CSRs
• HVH Aux HX

Question 2

What loads can be supplied from Extraction Steam?

Answer 2

• CSRs

- HVH Intermediate HX

Question 3

Why are the steam supply valves from MSS/ESS interlocked with ABS?

Answer 3

Prevents cross contamination of the Aux Boilers from MSS/ESS

Question 4

What is the isolation valve for the MSS supply to ASS?

Answer 4

2ASS-MOV148

Question 5

What Stage ESS supplies the CSRs?

Answer 5

9th Stage (4th Point) ESS

Question 6

When will the CSR Steam Supply auto swap?

Answer 6

2ESS-STV104 will auto open when 4th pt pressure is >57#, It will auto close at <50# or on a Turbine Trip. 2ASS-STV112 is the valve that swaps with it, in addition, 2ASS-STV112 will also close if MSS pressure is <200#

Question 7

When will a CSR Steam Admission Valve (MOV3’s) Auto Close?

Answer 7

• CSR level 4” below normal level

- Drain tank 14’ above normal level (Hi-Hi)

Question 8

When does the CSR Steam Outlet valve(MOV16’s) Auto Close?

Answer 8

Closes on a CSR Hi-Hi level (8” above normal)

Question 9

What will Lock Up the CSR Drain Tank Level Control Valves, LV8’s?

Answer 9

If Both MOV3A and MOV3B are open at the same time

Question 10

When do the CSR Drain Tank dump valves(LV9’s) open?

Answer 10

CSR Drain Tank 10” above normal (Hi-Hi)

Question 11

When do the CNA-LV8’s (CSR Drain Tk LVs) Auto Close?

Answer 11

• High level in 4th Pt FWS Htr

- Hi-Hi level in 1st or 2nd Pt FWS Htr

Question 12

When will the HVH Intermediate steam admission valves (MOV8’s) Auto Close?

Answer 12

Intermediate HX Lvelv Hi-Hi (4” above Normal)

Question 13

What will trip an Aux Boiler?

Answer 13

• Above 7” Water Level
• Above 157psig
• Ground Overcurrent