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HPCI Flashcards

1
Q

What is the purpose of the HPCI System?

A

To inject into Rx under emergency conditions at rate of 5000gpm over range of 1150 to 150psig

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2
Q

What modes does HPCI operate?

A

Pressure control and inventory control during Rx isolation with failure of Isolation Condenser

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3
Q

Under what conditions is HPCI designed to operate?

A

To provide adequate cooling for break sizes smaller than those sizes for which LPCI or Core Spray Systems to the core

Functions with loss of all offsite power - normal suction from CST due to low quality Torus water

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4
Q

How long after initiation does it take for HPCI to achieve full flow and what are it’s rated flows?

A

Full Flow w/in 25 seconds -

5000gpm minimum - 5600gpm normal

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5
Q

What is installed in HPCI Steam system to prevent overpressure?

A

Rupture Diaphragm

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6
Q

What are the normal and alt suction sources for HPCI? What causes auto swap?

A

CST & Torus

Auto Swap on Low CST or Hi Torus Level

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7
Q

What are the initiation signals for HPCI?

A

+2#DW Pressure
-59” RPV Lvl
Push Button - must be held until MSC goes to HSS

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8
Q

Is HPCI Initiation energize or de-energize to actuate? Isolation?

A

Energize to Initiation

Energize to Isolate

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9
Q

What are the automatic actions on HPCI Initiation?

A

Steam Valves get open signal (3 is only one normally clsed)
AOP Starts
MSC goes to HSS which opens stop and CV when oil pressure availavle
Speed control transfers to MGU
Drains reposition
Min Flow Opens then closes when >1130gpm
Suction vlv from CST insterlock open
Return vlv to CST interlock closed
8vlv stays clsoed until 125psig established.

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10
Q

What are the main HPCI valves, normal position, and power source?

A

2301-4 - I/B Stm Isolation - N.O. - MCC 29-1
2301-5 - O/B Stm Isol - N.O, 250vdc
2301-3 - Stm Supply - N. C. MOV - 250vdc
36/35 - Torus Suct. Vlv - Norm Closed - 250vdc - Grp 4 Isol
2301-14 - Min Flw - N.C. to prevent draining CST to Torus - 250vdc
2301-8 - Injection Vlv - N.C. - 250vdc
2301-10/15 - CST Test - 250vdc

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11
Q

What is the Auto Restart Inhibit for HPCI?

A

Prevents HPCI re-inititation following reset of Hi Rx Lvl trip concurrent w/ Hi DW Pressure -
WILL restart if lo-lo Rx Lvl reached

Prevents HPCI from cycling repeatedly hi lvl trip (42”) and trip reset (34)when DW press sig. valid

Prevents cycling 8 vlv and motor burnout.

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12
Q

What are the HPCI Isolation Signals?

A

100-200-300
100psig - lo Rx Pressure
200F HPCI Area Temp
300% Hi HPCI Steam Flow - 5sec Time Delay

(200F and 300% signals are seal in and have AC & DC trip relays)

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13
Q

How does HPCI System respond to HPCI Isolation signal?

A

4,5,35,36 interlock closed
AOP Interlock against autostart
3vlv interlock against auto open

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14
Q

What are the HPCI Turbine Trip Signals?

A 
B - Booster Pp Suction Press -9.4"Hg
L - Local Mech Trip Lever
O - Overspeed
W - Water Level +48"
M - Manual P/B
E - Exhaust Pressure High 100psig
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15
Q

What is the HPCI System Response to a Turbine Trip?

A

HP Control Oil cutoff - Trips stop valve & closes CV’s
MSC goes to LSS
8vlv interlocked closed on ALL TRB Trip Signals except Mech trips (Overspeed & Local Trip Lever)

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16
Q

How is HPCI Turbine Trip Reset?

A

MCR Reset Button or Local Reset Handle
If lo-lo initiation - turb will auto reset and cycle Tx level betwen -59 and +48
If on Hi DW Press - Trip on 48” and hi DW Press locked out until -59” reached or reset button pushed.

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17
Q

What are the HPCI System suction level interlocks?

A

Suction auto transfer from CST to Torus if Torus >+3” or CST lvl <10,000gal

35/36 vlvs open and 6vlv closes

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18
Q

What HPCI Controls prevents draining CST under normal conditions?

A

If 3 vlv (HPCI Steam Supply) is closed, 14 vlv (Torus Min Flow) should be left closed.

19
Q

Where do the HPCI Above Seat Drains come from, normally route to, and route on initiation?

A

Drain above seat area for HPCI 3 vlv Steam supply vlve to Inlet Drain Pot and steam trap - Normally through 29 and 30 vlvs and to MAIN CONDENSER

Alt to Torus upon initiation.

20
Q

Where do the Stop vlv above seat drains route to? What is normal vlv condition? Position on loss of IA and initiation?

A

64 and 65 vlvs route to HPCI Sump;

They are normally open and fail closed on Loss of IA and Initiation signal. WILL STAY OPEN ON MANUAL INITIATION

21
Q

Where do the Turbine Leakoff Drains Route?

A

From Turbine to Exhaust drain pot. Through steam trap and to Torus
Hi lvl in drain pot will bypass steam trap and send to GSLO condenser

22
Q

What is the Purpose of the Aux Cooling Water Pump and what is the power source?

A

It supplies cooling water pump for GSLO Condenser and Lube Oil Cooler when Turbine not running/not up to speed. Powered from MCC 29-4(39-1)

23
Q

What is the Purpose of the Gland Seal Leak Off COndenser?

A

Condenses gases from Turbine leak off and Exhaust Drains. Sends non-condensible gases to SBGT and Chimney

24
Q

What is the purpose of the HPCI Aux Oil Pump? Power Source?

What are auto start & Stop signals?

A

Provides Hi and Lo Press oil at startup operation until Trb Speed reaches 2000rpm - powered by 250vdc RB Bus.
Auto starts on system initiation
Auto Stop when adequate pressure in header from main oil pump (100psig)

25
Q

What is the HPCI Emergency Oil Pump purpose?
Power Source?
Auto Start?

A

Provides lubricating oil to Trb and Main Pp bearing when turbine on turn Gear or Oil Press low. ONLY BEARING OIL - NOT CONTROL OR STOP/CV OIL
Powered by RB 250vdc
Autostart at 36psig on oil header

26
Q

What is the purpose fo the HPCI Turning Gear?
What is its requirement for HPCI to be operable?
Power Source?
Autostart?

A

Provides low speed turning of rotor for cooling before complete turbine shutdown to prevent bowing.
Turning gear in not required for HPCI to be OPERABLE
Powered by RB 250vdc Bus
Turning Gear Motor will Autostart IF:
Turb Less than 4RPM AND
More than 7psig bearing oil header press
Turb CV fully closed

27
Q

How will HPCI Turning Gear respond to AOP being off and EOP being on?

A

Auto engagement will not work, must use TGM Control switch to engage;
IF reset p/b not pushed after turb rolls off gear, TGM will not auto engage when speed drops below 4rpm

28
Q

What are the HPCI Rm COoler system interlocks?
Power Source?
HPCI Operability Requirement for cooler?

A

Auto Start if room temp >100F
must be manually secured
Alarm if room temp >110F
Contact Sys Eng at 120F for instrument operability.
Powered by MCC 29-4; 39-1
If Fan not working, HPCI INOP
If cooling water not working, HPCI NOT INOP

29
Q

How Is the HPCI Turbine Speed Controlled?

A

Using the Motor Speed Changer and Motor Gear Unit

30
Q

How is the HPCI Motor Speed Changer used?

A

Used to control acceleration Turbine during startup.

Normally at LSS during standby and on system initiation will ramp up to HSS (High Speed Stop)

31
Q

How does the HPCI Motor Gear Unit support HPCI operation?

A

Provides speed control in response to flow demand signal from flow controller powered by ESS (converted to 125vdc).
Powered by 125vdc when control switch used.
Normally at HSS during Standby and controls when MSC reaches HSS limit.

32
Q

What are the normal speed stop sets for MSC and MGU?

A

MSC - 0 to 4000rpm

MGU - 2000to 4000rpm

33
Q

What are the normal power sources for HPCI DC logic?

A

Normal Power 2B-1
Backup Power 2A-1
Auto swap via contact logic - normal seeking

34
Q

How does the HPCI Signal Converter Function?

A

Positions MGU when control switch is not in use. Rectifies ESS power to 125vdc for use in MGU.

35
Q

What provides the HPCI flow demand signal when in automatic?

A

Flow Indicating Controller - provides the demand - and signal converter error signal used to determine MGU position requirement

36
Q

How does the HPCI Turbine Speed control function on turbine trip or slowdown?

A

The speed controller is a low speed gate, whichever is demanding lower speed between MGU and MSC will control speed. When Trip occurs, MSC runs to LSS and throttles down speed

37
Q

What happens to HPCI on loss of ESS?

A

Loss of Flow indicating Controller - Speed will need to be controlled manually using handwheels

38
Q

What gives HPCI Trip signal?

A

High Exhaust Pressure (100psig)
Hi Rx Level (ATWS) (+48”) - both divisions must actuate for trip
Lo Boost Pump Suction Press. (-9.4Hg vac) - bypassed on auto initiate - 2 out of 2 twice

39
Q

What happens to HPCI Initiation signal and logic when conditions clear?

A

Auto Reset

40
Q

What happens to HPCI on loss of both 125vdc signals??

A

Cannot control from MCR.
Will not auto initiate
Cannot be tripped or restet from MCR

41
Q

What happens on loss of ONE HPCI 125vdc supply?

A

Loss of 2B-1 auto transfer to 2A-1.
Loss of 2A-1 - no transfer - but turbine will not trip on Hi Level because one of 2 relays requried fro trip will not have power.

42
Q

HPCI response to loss of RB 250vdc bus?

A

Major loads except Aux Cooling Pump and 2301-4 vlv lost
alarms on 902-3 panel lost
HPCI INOP
AOP WILL NOT start on auto start - THUS NO OIL TO STOP AND CV - TURBINE WILL NOT START
IF running - HPCI indicatiosn lost - vlvs fail as is, GSLO exhaust fan trip

43
Q

HPCI Resposne on loss of ESS

A

Signal converter failure alarm
MGU Fails as is, but control switch can operate
Speed will begin to oscillate

44
Q

What happens if the HPCI min flow valve (14) fails?

A

HPCI INOP

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