R21 - LSS Flashcards
What LCC buses can be powered by Flex generators?
Why?
15BA6 and 16BB6
to feed battery chargers
What is the Logic for LSS initiation?
How is it reset?
one out of two taken twice
it is reset manually
if both BUV and LOCA are detected, what sequence will take precedence?
LOCA
What is the time delay for starting SSW C after BUV, LOP, or LOCA?
10 seconds
What are the BUV signals for DIV 3?
88% for 4 seconds, starts a 5 minute timer
73% diesel will start 2.3 seconds later
What are the LOCA signals for DIV 1 and DIV 2?
-150.3” Rx water level
1.39# Drywell pressure
ECCS manual initiation
what bypasses the 5 minute timer for DIV 3?
2 different signals (BUV, LOP, LOCA)
What are the LOCA signals for Div 3?
-41.6” Rx water level
1.39# Drywell pressure
HPCS manual initiation
What causes BUV load shed for DIV 1 and 2?
90% BUV for 9 seconds
70% BUV for .5 seconds
What pumps will start first after a LOCA on a DIV 2 and their time delays?
RHR C - 0 seconds
RHR B - 5 seconds
SSW B - 10 seconds
What is the white light on the LSS panel for?
Goes off when BUV, LOCA, or diesel breaker is closed and not paralleled
What is the red light on LSS panel for?
comes on when load sequencing starts
What is the amber light on LSS for?
Trouble (LSS has signal, but not sequencing yet)
How do the lights on LSS reset?
They reset after LSS is manually reset
What pumps start first on DIV 1 after LOCA and their time delays?
LPCS - 0 seconds
RHR A - 5 seconds
SSW A - 10 seconds
