E22-2 - ADS/SRV Flashcards
When will drywell pressure be bypassed on ADS logic?
If Rx level is < -150.3” for more than 9.2 minutes
What is the LO-LO set logic?
Durn Burn Durn Green Apple Farts
Initial Lo-Lo set Reset
- 51D 1103 1033 926
- 51B 1113 1073 936
- 47D 1113 1113 946
- 47G 1113 1113 946
- 51A 1113 1113 946
- 51F 1113 1113 946
How is LO-LO set reset?
manually
What valves are ADS valves?
B21:
- F041D
- F041F
- F041K
- F047A
- F047L
- F051A
- F051B
- F051C
Dad Fought Kids And Lost, ABC
What valves can be operated from Remote Shutdown Panel?
Lo Lo set valves
When do SRV valves open for relief operation?
1 valve - 1103 psig open, 1003 close
10 valves - 1113 psig open, 1013 close
9 valves - 1123 psig open, 1023 close
How many SRV’s per steam line?
A and D have 4 each
B and C have 6 each
20 total
Purpose of the vacuum breakers?
Prevent vacuum from condensing steam in discharge piping, causing suppression pool to enter piping and eventually water hammer
When do valves open in safety mode?
8 valves @ 1165 psig
6 valves @ 1180 psig
6 valves @ 1190 psig
How many ADS valves can be operated from Remote Shutdown panel?
what valves are they?
2
(4 switches…. 2 switches on each panel)
51 A/B
How much air pressure is supplied to ADS valves and SRVs?
ADS supplies 165 psig to ADS and F051D.
All other SRVs have Instrument air @ 120 psig
How many accumulators does each SRV have?
Non ADS except 51D have 1.
ADS and 51D have 2
How does light indication show a SRV open/close?
>= 30psig shows valve open (red) tailpipe pressure
< 30 psig shows valve green (closed) tailpipe pressure
valve can be opened, yet showing closed if tailpipe pressure is < 30 psig
what powers logic to tailpipe pressure?
Div 1
What is the purpose of ADS?
Serves as a backup to HPCS to depressurize the reactor so that Low Pressure ECCS can inject
Purpose of SRV?
SRVs help to control Rx pressure < 1325 psig
How many SRVs?
20
How many SRVs are ADS valves?
8
Where are the SRVs located?
main steam line, upstream of MSIV
What two modes can SRVs operate in?
How does each mode work?
Safety mode - mechanical (Rx pressure vs Spring)
Relief mode - pneumatic
Power supplies for the SRVs?
Div 1, 11DA
Div 2, 11DB
what valves does ADS Air supply?
ADS valves AND F051D
How many pilot soleniods must be energized to open SRV?
Normally de-energized, energizing ONE will allow SRV to open.
energize one to open
de-energize two to close
When does the high temp alarm come in for the tailpipe temp?
155ºF
What happens to ADS logic if an ECCS pump trips?
Logic resets
When does the ADS low air receiver annunciator come in?
< 152 psig
What sensors must energize to set off ADS?
Div 1 - A&E or Div 2 - B&F
What is the logic after ADS receives a signal?
11.4” AND -150.3” AND 1.39# DW (DW can be bypassed if <150.3” for 9.2 minutes)
THEN, 105 second time delay
THEN ECCS discharge pressure (145# LPCS, 125# RHR A/B/C
If AC power is lost, is the logic lost to ADS?
NO
