Reactor Core Isolation Cooling (RCIC)

Question 1

What happens to RCIC on a loss of DIV 1 DC

Answer 1

Loss of initiation logic

Question 2

What happens in the RCIC system when the Manual Isolation Push Button is pressed?

Answer 2

MOV121 will shut if initiation signal is present.

Question 3

What are the RCIC turbine direct trips and what valves close?

Answer 3

1. Closes MOV150, 143, 126
2. Trips
   - High exhaust pressure (50#)
   - Pump suction low @ 20” Hg (3.5 sec)
   - Overspeed @ 118.7%
   - local trip lever

Question 4

What happens to RCIC trip throttle valve MOV150 on a LOCA signal?

Answer 4

• divorced from the DIV 1 bus on a LOCA signal and must be reset locally if tripped

Question 5

What happens to RCIC on a loss of its pressure transmitter?

Answer 5

Loss of min flow valve

Question 6

What directs what on the RCIC controller?

Answer 6

Manual is speed control
Auto is flow control

Question 7

What powers the RCIC flow controller/governor control valve MOV151?

Answer 7

UPS2A

Question 8

What initiates RCIC?

Answer 8

L2 ONLY!!!

Question 9

What valves close at L8?

Answer 9

MOV120 closes
tells MOV126 to close
tells MOV143 to close
Ramp Generator resets

Question 10

What in RCIC causes the Main Turbine to Trip?

Answer 10

1. Initiation (L2)
2. MOV126 not closed
3. 4 min TD

Question 11

What closes MOV126

Answer 11

MOV150 closed
OR
MOV120 closed for 10sec

Question 12

What happens with a failure of the RAMP Generator?

Answer 12

RCIC Turbine operates at 1000 rpm with NO INJECTION

Question 13

When does MOV136 Supp Pool suction valve open

Answer 13

CST <145.5” (10sec) AND 108/124 closed

Question 14

When does MOV143 min flow valve open

Answer 14

> 140psig and <110gpm

Question 15

When does MOV143 min flow valve close

Answer 15

> 220gpm OR
MOV150 closes OR
MOV120 closes

Question 16

What happens in the Ramp Generator fails high.

Answer 16

Overspeed Trip

Question 17

When and how does the manual isolation work?

Answer 17

1. Only during an Initiation Signal
2. Only closes MOV121, outboard isolation valve

Question 18

What are the Div 1 Group 10 isolation valve(s)

Answer 18

MOV121

Question 19

What are the DIV 2 Group 10 isolation valves?

Answer 19

MOV170, 128

Question 20

How many transmitters are required to isolate RCIC?

Answer 20

2

Question 21

What flow requires speed control (Man)

Answer 21

<400gpm (on speed control stay >1500rpm)

Question 22

What RPM shall be maintained when in speed control?

Answer 22

> 1500rpm

Question 23

When must RCIC be operable during a S/U?

Answer 23

Prior to 150psig in the RPV

Question 24

When does MOV129 Open?

Answer 24

RCIC initiation

Question 25

When does MOV129 close?

Answer 25

When MOV136 is FULL Open

Question 26

When does MOV126 Open?

Answer 26

1. RCIC initiation (6.5 sec) 2. MOV120 NOT closed (10 sec) 3. MOV150 NOT closed

Question 27

When does MOV126 close?

Answer 27

1. MOV150 closed OR 2. MOV120 closed (10 sec)

Question 28

What happens if the RAMP generator fails to energize?

Answer 28

RCIC will be at 700-1000 RPM

Question 29

What are the RCIC Group 10 isolations?

Answer 29

1. RCIC Steam Supply Low Pressure - 75psia 2. RCIC Turbine Exhaust Diaphragm Pressure High - 5psig 3. Rx Bldg Gen Area High Temp - 130.2F 4. High Temp (RCIC Equip Area, RCIC Pipe Chase, Rx Bldg Pipe Chase, RHR Pump Room) - 135F 5. RCIC Steam Line Flow High - 165.9" H2O OR <-275" H2O. 6. RHR/RCIC Steam Flow High - 36.2" H2O OR <-275" H2O.

Question 30

What are the RCIC Group 11 isolations?

Answer 30

1. RCIC Steam Supply Low Pressure - 75psia AND 2. High DW - 1.68# AND 3. ~70 sec time delay

Question 31

When does RCIC injection occur?

Answer 31

When discharge pressure is 110psig greater than Rx pressure.

Question 32

How is ICS turbine casing and exhaust piping protected against overpressure?

Answer 32

Dual rupture disc. Each rupture disc blows at 150 psid

Question 33

What is the Power Supply for all MOVs in RCIC except PCIVs?

Answer 33

DIV I DC