AIR removal system

what is the purpose of the AR system

establish vacuum on startup and remove non condensable gasses at power

where does the system normally discharge to?

how is it monitored

the plant vent stack, By and RU monitor

how many stages are the AR pumps

2 stages

what are the auto starts for AR pump D

4.2 Hga in A shell

4.8 Hga in B shell

5.3 Hga in C shell

What are the auto actions of the D ar pump suction vavle

Will auto open to the shell with degraded vacuum if more than one has a degraded vacuum it will open to all affected shells

describe the AOV valves 19A 19B and 13

19 A is the inlet to the filter 19 B is the bypass valve and 13 is the outlet valve

what is the fail position for 19A, 19 B and 13

fails thru filter on loss of power or air

19a and 13 open

19B closed

what happens on an RU 141 alarm HI signal?

what is the hi RU 141 alarm indicative of?

turns on filter blower and aligns thru filter mode. the hi alarm is an early indication of SGTR

what provides makeup seal water to the AR pumps

makeup seal water is provided by the Condensate system

What cools the AR pumps

PW

what must be in service prior to starting the AR system

gland seal steam should be in service