HPCI

Question 1

What signals will auto initiate HPCI?

Answer 1

LL2 (105”)

OR

Hi DW pressure (1.7#)

Question 2

What happens on a HPCI initiation?

Answer 2

• White initiation light
• F059 - cooling water valve - OPEN
• F004 - CST suction valve - OPEN
• F007 - pump discharge - OPEN
• F008 &; F011 - test return line - CLOSED
• Vacuum pump starts
• F001 - steam supply - OPEN
• F025/F026 - condenser drain - closed
• Aux Oil Pump starts
• V9 Governor valve initially strokes open then closed and the V8 turbine stop valve starts to open

Question 3

What causes a Group 8 Isolation and what valves are affected?

Answer 3

LL 1 (166”)

OR

High steam dome pressure (131#)

RHR SDC suction valves F008, F009 close

RHR Inbd Injection Isolation F015 on LL1 only if F008 or F009 are not full close

Question 4

What causes a Group 4 isolation?

Answer 4

SELF

• Steam line low pressure - 115#
• Exhaust Diaphragm Pressure - 7#
• Leak Detection
  
  • HPCI equip area 165F
  • HPCI steamline area 165F
  • Tunnel deltaT 47F
  • HPCI steam tunnel 165F, 190F
• Flow high (steam) - 220% for 5 seconds
• Manual (closes outboards only)

Question 5

What is the normal suction source for HPCI?

Answer 5

CST

Question 6

Where does HPCI inject?

Answer 6

Feedwater line A

Question 7

What will cause HPCI to swap suction to alternate? What is the alternate supply?

Answer 7

Suppression Pool

Low CST level (<3’5”) OR hi torus level (-25”)

Question 8

When does the HPCI min flow valve open?

Answer 8

<400gpm and >140#

closes >1400gpm

Question 9

What causes a HPCI trip?

Answer 9

Manual Overspeed - 4600rpm Level - 206” Exhaust pressure high - 157.5# Suction pressure low - 15” vacuum for 13 seconds Any isolation signal

Question 10

When do HPCI trips reset?

Answer 10

All except level and isolation clear when condition clears. high level seals in until LL2 or manually reset High DW pressure will NOT initiate HPCI if tripped on LL2

Question 11

What are the group 4 valves?

Answer 11

HPCI steam F002 (inboard - Div 2 AC) F003 (outboard - Div 1 DC) HPCI Torus Suction F042 (inboard - div 1 DC) F041 (outboard - div 1 DC)

Question 12

What are the group 7 valves?

Answer 12

HPCI Exhaust Vacuum Breakers F079 inboard - Div 2 AC F075 outboard - Div 1 AC

Question 13

What are group 7 isolation signals?

Answer 13

Steam line low pressure (115#) ANDDrywell Press High (1.7#)

Question 14

What is a HPCI turbine trip?

Answer 14

HPCI turbine trip solenoid energizes to trip V8

Question 15

What are the effects of a loss of panel 3A(4A) on HPCI?

Answer 15

HPCI will not operate, outboard isolations fail to closeTorus suction valves fail open due to false CST low level signal

Question 16

What permissions need to be met for the HPCI CST suction valve (F004) to open?

Answer 16

At least one torus suction valve must not be full open (F041 or F042)or control switch