Which of the are ASS loads or functions?
steam jet air ejectors
hot water heating system
TDMFW gland sealing steam
Which statement describes the function and operation of the aux building aux steam header isolation valve?
the valve isolates aux steam to the aux building automatically during steam line break conditions (determined by aux building ambient temperature)
What is a problem when aux boilers supply the aux steam system?
the chemicals used to treat the aux boiler feed water can cause conductivity alarms on the aux condensate flash tank outlet, causing effluent water to dump to the liquid waste system
The plant is at 10% power during S/U following cold shutdown. What is the source of steam for the steam jet air ejectors?
aux boiler master controller, with steam from an operating auxiliary boiler
What is the MP3 EPA permit limit for max aux boiler fuel oil usage?
8 gal per minuter per boiler
IF the aux boiler fuel oil consumption rate were to increase significantly above its normal rate, what concerns arise?
EPA permit does not allow more than 8 gpm per boiler
Plant tripped from 100% power in mid-summer. How many aux boilers will be started and why?
1 boiler, since plant heating loads are minimal
Which of the following is the sequence for an emergency shutdown of a auxiliary boiler?
press “manual trip”, then “purge and reset”
During startup and warmup of aux boiler, when does the atomizing medium automatically switch from service air to steam?
when steam drum pressure reaches 100 psig
What will cause the aux building steam header isolation valves to auto close?
aux building temp exceeds 127 F
??
a pulsating flame which expands and contracts
How long is the burner gun manually purged after fuel is shut off?
2 mins
What would be the consequence of opening the “B” aux boiler fuel oil tank outlet, and closing the “A” aux boiler fuel oil tank outlet?
“B” tank will slowly transfer to the “A” tank because the recirc valves were not swapped
What is the source of aux steam for U2?
U3 aux steam header supplies a reducing station in CPF
When is the #2 atomizer allowed to be placed in service?
during a changeout of a dirty #1 atomizer while the boiler is already operating
How is the main flame ignited in the aux boilers?
a propane igniter flame is used to light the main oil flame
What are the lift set points for the “A” aux boiler code safety valves SV26A and SV25A?
170 and 175 respectively
It is mid-august, 70F.
Can the entire U3 aux steam header system be shut down?
no, aux steam needed to supply loads like condenser air ejectors steam supply
How is U2 aux steam system removed from service while keeping U3 ASS in system?
U2 ASS reducing values are isolated using both inlet and outlet manual isolations
The U2 ASS is S/D and isolated from U3 for the summer. Can the U2 aux condensate system be shutdown?
yes, shutting down the U2 ASS supply V991 results in all inputs to U2 aux condensate being isolated as well
When warming a cold (ambient) aux boiler, what is the fuel oil flow rate set and why?
1.2 gpm to reduce heat rate within manufacturer recommendation
When S/D an aux boiler, how is the fuel oil system shut down so that the burner gun will remain filled with oil?
the boiler is shutdown by pressing the “oil gun stop” PB
