High Pressure Core Spray (CSH)

Question 1

What happens on an Initiation seal-in rest for Level and Hi DW?

Answer 1

L2 will override the reset. The Hi Dw will reset but the pump will stay running.

Question 2

What does HPCS maintain in RPV on a 1” line break?

Answer 2

Maintain >L1
Prevent ADS
Cover TAF

Question 3

When does min flow valve MOV105 open?

Answer 3

<634gpm and >240#

Question 4

What is required for Hi DW pressure or Level detectors?

Answer 4

A or B
AND
C or D

Question 5

What changes will occur on an inadvertent initiatoin of HPCS?

Answer 5

1. NR lvl increase (stable at higher lvl)
2. APRMs decrease (low pressure, more voids)
3. Steam Flow decrease (more power spent heating water)
4. Feed Flow decrease (compensates for water addition from HPCS)
5. Pressure decrease (restored by EHC to new lower value)
6. MWe decrease (subcooling increased, reduced efficiency)

Question 6

What happens to CSH-MOV110, 112 (CST return line valves) on initiation?

Answer 6

Auto Close on system initiation

Question 7

What does the L8 TEST keylock switch bypass?

Answer 7

L8

Question 8

When does HPCS suction swap from CST to Supp Pool?

Answer 8

CST @ 97”
OR
Supp Pool @ 200.52’
(suctions do not realign on initiation)

Question 9

What are MOV101 (CST Suction Valve) interlocks?

Answer 9

1. Closes when MOV 118 (Supp Pool suction valve) is 95% Open
2. MOV118 must be closed in order to Open

Question 10

What are MOV118 (Supp Pool Suction Valve) interlocks?

Answer 10

1. Will not open if MOV110, 112 (CST return valves) are open.
2. Can Override closed.
3. MUST Shutdown pump to realign to the CST.
4. Auto open if, supp pool >200.52 or CST <97”

Question 11

What are MOV111 (Supp Pool return Valve) interlocks?

Answer 11

1. Auto closes on system initiation.

Question 12

What are CSH-MOV107 (RPV Injection Valve) interlocks/features?

Answer 12

1. Opens L2, 1.68#DW
2. Closes L8
3. Override = Amber light
4. Still moves with overload. Throttleable if stroking manually.
5. Will always auto open on L2, no matter what!
6. Cannot be made throttleable below L2
7. Only auto closure is L8.

Question 13

what needs to be verified if depressing high water level reset?

Answer 13

Verify Open MOV107 if below L8.

Question 14

What are HPCS OPERABILITY ties with P2 (Jockey Pump)

Answer 14

1. 47ft required in CST if P2 is INOP.
2. If <47ft and Hi Point Vent alarm is in, CSH is INOP and Unavailable.

Question 15

What must be done in the CSH system in order to realign from supp pool to CSTs?

Answer 15

Shutdown the pump