Secondary Chem Control (SC) Flashcards
What pressure is the BFT maintained at by the pressure regulating valves 4A and 4B?
in what order do they open?
200 psig
4A first to the HDT equalizing line
4B opens to the CD if 4A is full open and can’t maintain pressure
What cools the B/D heat exchanger?
Where is flow returned to?
CD pump discharge
MFWP suctions
How do the S/G B/D isolation valves fail on a loss of air or power?
closed
What will automatically close the S/G blowdown containment isolation valves?
SAM
SIAS
AFAS
MSIS
What will automatically close the S/G blowdown SAMPLE containment isolation valves?
SAM
SIAS
AFAS
MSIS
Where can the S/G blowdown liquid be discharged to?
When would flow isolate automatically?
3 LPFWHs
to the B/D demins
retention tanks
hi temp coming out of the B/DHX
Which S/G B/D valves auto close on a B/DHX high temp signal?
3B (through B/D demins) and 3C (to retention tanks)
NOT 3A (to LPFWHs)
What happens if there is a hi temp signal coming out of the B/DHX and the BYP DEMIN MODE LV 3A position is not selected at the handswitch?
BFT will overfill due to no discharge flow path
BFT reliefs will eventually open
Where is the B/D Demins discharge directed to?
the condenser
What cools the B/D demin sample coolers?
WC
What cools the B/D demin field coolers?
NC
What radiation monitors are associated with S/G Blowdown?
RU-4/5
detects radioactivity downstream of the sample coolers to detect primary to secondary leaks
RU-200
isolates flow (V-1283) to the retention tanks if radiation detected
How are S/G blowdown constants verified and entered?
updated in the PC and CMC
documented IV on new B/D constants before numbers are typed into the computer
documented CV when entering constants into the computer
Which S/G blowdown valves fail closed on a loss of instrument air?
What is the exception?
All fail closed except for the BFT pressure control valves
What valves are affected in the S/G blowdown system on a CSAS?
How do we get them back?
INSIDE containment isolation valves (500 series) fail closed
CSAS isolates IA to containment, 500 valves fail closed on loss of air
take inside containment isol valves HS to close, override and open IA to containment valve, clear downstream side of valve of voids before reopening in a controlled manner to prevent damage
What is required prior to initiating S/G blowdown?
condenser vacuum
CD demins inservice
chemistry notified
How many S/Gs can be in High-Rate blowdown to the Condenser?
1 at a time
What is the purpose of the wet layup pumps?
clean/remove chemicals and suspended solids during extended shutdowns
maintain chemistry requirements during shutdown when in recirculation
How do the S/G blowdown rate line valves fails on a loss of air or power?
fail closed
When on High-rate S/G blowdown, how many valves are open?
2
high rate and abnormal rate valves
What is the purpose of Polyacrlic acid (PAA)?
where is it injected?
how is it operated?
promotes suspension of particulates
inhibits the ability of iron oxide particles to clump together
inhibits the ability of iron oxide to stick to surfaces
upstream of the FW venturi flowmeters and corrosion product monitors
locally by AOs on 100’ TB
