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Systems > LPCI > Flashcards

LPCI Flashcards

1
Q

What is the purpose of LPCI?

A

Prevent fuel cladding from exceeding any thermal limits (>2200F APLHGR Limit) as a result of a LOCA for break sizes where core is adequately cooled by HPCI, up to and including DBA line Break

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2
Q

Where does LPCI normally take suction from? Alternate? Suction Limitations?

A

ECCS Ring Header off Torus.

Alt: CST - but only one pump can be lined up at a time.

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3
Q

Where does LPCI Injection normally discharge to on injection?

A

Discharged to recirc pump discharge line and into jet pumps

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4
Q

What other system injects into the LPCI Injection Line?

A

Shutdown Cooling ties into LPCI line upstream of check valve that divides LPCI and recirc systems

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5
Q

Where does the LPCI Min Flow line route to?
What are the open and close setpoints?
What is it’s normal position?

A

Min Flow Line routes water to LPCI Test Line in Torus.
It closes at 1300gpm flow.
Opens at 1211 gpm flow and pump running on that side.
The Min Flow valve is only open when pump is in standby?

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6
Q

What is the pump/injection condition required for min flow to be active?

A

Pump in standby or Pump running and less than 1300gpm flow.

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7
Q

Where are the LPCI Pumps powered from?

A

2A/B powered from 23-1

2C/D powered from 24-1

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8
Q

What is the standard flow for LPCI with a single pump and 2 pumps running?

A

1 pump : 5000gpm

2 pump : 9000gpm

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9
Q

What is the LPCI pump oil cooler cooling?

A

Its own pump discharge

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10
Q

Where are the LPCI system valves primarily powered from? Which are not powered from here and what are they powered from??

A

Most valves powered from 28-1/29-4 (38-4/39-1). The injection valves -21/22 - are powered from 28-7/29-7 (38-7/39-7)

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11
Q

Where can the LPCI valves be manipulated from?

A

MCR, Local control stations, the valve itself

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12
Q

What does the LPCI Cross Tie do?

A

Provides so the A & B Loops can be cross tied together. This is required to be open for system operability.

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13
Q

What provides the LPCI Keepfill?

A

ECCS Jockey Pump

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14
Q

What is the approximate heat removal capability of the LPCI Hx and what provides the cooling?

A

~20MWth - cooling from CCSW

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15
Q

For minimum safety analysis how many CCSW Pps, Hx, and LPCI Pps are required

A

Min 2 CCSW Pps, 1 Hx, and 1 LPCI Pp all in the same loop

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16
Q

What is the normal operation of the HX upon LPCI Start/initiation?

A

Bypassed through N.O. bypass valve, which is interlocked open for 30 seconds on initiation signal

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17
Q

What is normal pressure of CCSW compared to LPCI?

A

CCSW ~20psid>LPCI - controlled via outled valves

18
Q

What is the normal power source and all cooling water sources to ECCS ROOM COOLERS?

A

Powerd by MCC 28-1/29-4(38-1/39-1)

Cooling from SW, CCSW, or DGCWP (INops EDG)

19
Q

What are the alternate flow paths for LPCI?

A

Torus Spray, DW Spray, Test/Torus Cooling

20
Q

What is the normal flow for Torus and DW sprays?

A

5000gpm total - 4750gpm DW Spray, 250 Torus Spray

21
Q

What is the normal position of the Torus Spray and DW Spray valves? Are they throttleable when opened?

A

The are all normally closed.

DW Spray not throttleable, Torus spray valves are throttleable

22
Q

Which valves are in the LPCI Injection Path? Where are they? What is normal position? what kind of valve are they?

A

21 vlv - norm open - throttle globe valve - first injection valve
22 vlv - norm clsd - open/closed gate - second injection
25vlv - nom closed chk vlv - in DW - pos ind. in DW

23
Q

Where are the LPCI Flow elements and what do they do? What is the power source for the FLow Transmitters?

A

2 FE/FI/FT upstream of 21 valve
Shows only injection or Test flow
A - loop powerd by IB
B - loop powered by ESS

24
Q

WHAT ARE THE LPCI INITIATION SIGNALS?

A

2# DW Pressure

  • 59” and <350# Pressure
  • 59” for 8.5 Min
25
Q

What is the purpose and logic for LPCI Loop Select?

A

Chooses which LPCI/RR Loop to inject into.

Upon initiation -
If <2RR Pps running, trip both and wait for 900psig RPV Pressure
After 900psig or if both RR were running - Is A riser 1psid>B riser
If yes, then B loop determined in broke and A chosen for injection. Otherwise B is default.

26
Q

What valve/pp manipulations are performed automatically upon selection of loop for injection?

A

Selected Loop: RR Pp Discharge vlv closes and Pp trips.

Opp loop - LPCI Inject vlvs close

27
Q

Why does LPCI Loop Logic required to limit RR Pump Speed mismatch?

A

TO ensure no confusion during loop selection - cannot compare running pump to a line break

28
Q

Upon Initiation signal, what is the LPCI valve response?

A

Suction Valve interlock open
Hx Bypass interlock open 30 sec
Nonselected loop inject vlvs interlock closed - can be overridden by 316/317 keylock
Selected loop 21 & 22 vlvs open at <350# RPV Press - 21 vlv interlocked full open for 5 min -can be bypassed.

29
Q

What is the purpose of the 316/317 keylock switches?

A

316 allows reopening of 21 vlv for torus cooling if needed

317 can be used if level

30
Q

What is the Test Line, and DW/Torus Spray Response on initiation?

A

Vlvs interlock closed to maintain flow to core - can be overridden by 316 keylock
If lvl

31
Q

What is the CCSW response to LPCI Initiation?

A

CCSW Pps trip - 318 keylock used to bypass trip and start pumps

32
Q

What is response of LPCI to initiation with LOOP?

A 
Will have a logic delay based on EDG starting. 
10 seconds to start and close breaker 
3 seconds to reset UV relays
1st pp starts immediately
2nd pp starts 5 sec later
CS Pp starts 5 sec later
33
Q

What are the injection vlv interlocks?

A

> 350#, 21 vlv can be opened if 22 closed
22 vlv can be closed if both 21 and 38 closed
Below 350#, both 21 and 22 can open at same time

34
Q

What powers the Loop Select Locic?

A

Div I /II 125VDC power

35
Q

What happens on a loss of Div I 125VDC (2A-1)(3A-1) power to LPCI?

A 
Div I Pps not auto start
Div I vlvs not auto position
No -59 sig to HPCI
No 2# signal to CS A logic
21/22 vlvs WILL reposition based on Div II loop select because powered by 28-7/29-7 whcih auto swap.
36
Q

What are trips of LPCI Pumps?

A

Overcurrent or Bus UV

37
Q

What provides level indiation/signal upon LOCA and ECCS initiation?

A

Fuel Zone

38
Q

What happens to LPCI on loss of Div II 125VDC power?

A

Div II Pps not auto start
Div II Vlvs not auto position
21/22B vlvs WILL repositon based on Div I loop select
NO 2# signal to CS B logic

39
Q

What will loss of single division Loop Select Logic have on ability to detect break or cycle valves?

A

None - will power from other division.

40
Q

What happens if you lose more than 1 LP ECCS Subsystem?

A

ENter 3.0.3.

Systems (97 decks)

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