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ILOT > Condensate - .5 > Flashcards

Condensate - .5 Flashcards

1
Q

What is the purpose and functions of the Condensate System?

A

Deaerate and condense turbine exhaust and deliver purified condensate
1. Cool SJAE condensers
2. Serve as heatsink for bypass valves, FWH drains, other cycle effluents
3. Provide water to CRD

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2
Q

What are the protective functions for RFP associated with the loss of condensate pumps?

A
  • Loss of 1 PCP: RFP Runback to 86.3% (4816 RPM) and Intermediate recirc runback (45%) (– pcp is physically lower than an scp, so RFP runs back lower !)
  • Loss of 1 SCP: RFP Runback to 89.3% (4961 RPM) and Intermediate recirc runback (45%)
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3
Q

What is the series of events that occur during a PCP Start Enable?
or
Which conditions illuminate the PCP Start Enable light?

A

Suction Valve 100% Open
Discharge Valve 100% Closed
Hotwell Level > 6”
SJAE/SPE Bypass Valves 100% Open or at least one other PCP running.

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4
Q

What is the series of events that occur during a SCP start enable?

A

Suction Pressure ≥ 30 psig
Suction valve full open
Discharge Valve 100% Closed (Does not auto open on start)
Lube Oil Pressure > 6 psig (16 psi reset)
At least 2 PCPs Running

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5
Q

What are the PCP Pump Trips?

A

Electrical Protection Relays (All other Auto Trips Disabled)

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6
Q

What are the SCP pump auto trips?

A

Electrical Protection Relays
Lube Oil Pressure ≤ 6 psig
Low Flow (< 3000 gpm for 30 sec)

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7
Q

What conditions require the operator to manually trip the PCPs?

A

1). Suction Valve NOT Full Open (AB.RPV-4, R.O)

2) Hotwell Level < 6” (Low-Low, 2/3 logic)

3). HV-1710 < 30% open w/in 75 seconds of Open Demand (min flow)
And
* 1 or More PCP Running and NO SCP Running
Or
* 2 or 3 PCP Running and 1 SCP Running
**Does NOT Auto Close (unless placed in Lockout)

Discharge Valve (HV-1680)
-Not > 35% Open (40 Sec after Pump Start), or
-Not Full Open (99 Sec after Pump Start), or
-Full shut

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8
Q

What conditions require the operator to manually trip the SCPs?

A

Suction Valve NOT Full Open (AB.RPV-4, R.O)
Suction Pressure < 30 psig (10-15 sec)

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9
Q

What starts the SCP Aux Oil Pump?

A

Start if SCP LO Pressure is < 6psig
Starts if Shaft driven oil Pump Suction > 35psig indicates reverse rotation of SCP.

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10
Q

What are the Condensor Vacuum automatic actions?

A
  • 4.5”HgA – Intermediate RR upon loss of 1 CW pump (3 remaining)*
  • 5-6”HgA – Low Condenser Vacuum Alarm
  • 5.8”HgA – Full RR upon loss of 1 CW pump (<2 remaining)*
  • 7.5”HgA – Main Turbine Trip
  • 10”HgA – RFPT Trip
  • 21.5”HgA – MSIV closure
  • 22.9”HgA – Bypass valve closure
  • 5 psig – rupture discs

*High pressure signal must exist at the time of the pump trip (approx. 1 sec) to initiate runback signal.

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11
Q

What controls Hotwell level?

A

Hotwell level is controlled by makeup from and reject to CST
* Hi alarm – 54”
* Lo alarm – 30”

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12
Q

What are the SCP, PCP and total pumps heads?

A

PCP – 202 psig
SCP – 535 psig
Total – 737 psig

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13
Q

Where does the condensate prefilter operate and what occurs on a loss of power?

A
  • Filter Discharge of PCP after SJAE/SPE
  • Bypass fails open on loss of power
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14
Q

Describe the when the SJAE/SPE Bypass valves are operated and what occurs when the valve receives a loss of it actuating medium.

A
  • Must be open to start 1st PCP
  • Maintain 10.83psid across SJAE/SPE to ensure proper flow
  • Fail open on loss of air
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15
Q

What valve in Condensate provides flow to the CRD suction?

A

HV-1677 Reject Bypass - Sends 140 gpm to CRD suction (taps off immediately after the con-demins.

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16
Q

What occurs if you get a high level in FWH 1 or 2?

A

Hi-Hi level in FWH 1 or 2 will isolate Condensate through that train #1 or #2 drain coolers. (protects turbine from water)

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17
Q

What is added in the common suction line for the PCP?

A

Oxygen is added in the common suction for the PCP pumps.

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18
Q

How does the SCP min flow valve operate and what happens on a loss of operating medium?

A

SCP min flow valve Passes 4500gpm, If flow is > 4500 gpm, valve is full closed. – fail open on loss of air

19
Q

How does the Condensate Reject Bypass Valve fail on a loss of operating medium?

A

fails open on a loss of air

20
Q

How does the SJAE/SPE Condenser Bypass Valve fail on a loss of operating medium?

A

fails open on a loss of air

21
Q

What is the required position of the Condensate Pre-Filter bypass valve?

A

Ensuring AL-HV-8814 is open is not a permissive required for start of a condensate pump. However, unless this valve is opened, the condensate pump will not have a flow path to the condensate min flow valve

22
Q

What conditions will cause a breaker INOP on the Condensate pump breakers?

A

a) Loss of breaker control power
b) Loss of trip coil continuity
c) Spring not charged within 3.0 seconds
after breaker closure
d) Breaker not in OPERATE position
* Racked out to TEST or DISCONNECT
* Breaker control switch in PULL TO LOCK

23
Q

Describe the PCP min flow valve operations.

A

When in lockout the valve will close and inhibit the start logic for the PCP.
When in Auto the valve will open in response to:
· > 1 PCPs running with no SCPs
· One SCP running with > 2 PCPs
and the open-close pushbutton

NOTE: the valve will not auto close in auto, but needs to be manually closed.

24
Q

What happens when 3 PCPs are running with no SCPs?

A

CNDS RECIRC CAPACITY EXCEEDED annunciator will alarm

25
Q

What is the purpose of the Main Condenser 3 min Condensate Retention time?

A

Allows time for decay of short lived radionuclides before condensate leaves condenser

26
Q

What is the PURPOSE of the steam inlet Expansion Joint in the Condensate system and How it is sealed to prevent air inleakage?

A

Counters differential expansion between the Low Pressure Turbine and the condenser Exhaust trunk.

Sealed to each LP turbine with a rubber expansion joint.
Normally a dry area, but it is enclosed by a dam which could receive water from the Condensate Storage Tank.

27
Q

What is the purpose of the Condensate System reject Bypass Valve (FV-1677)?

A

Constant supply of deaerated water to CRD Pump suction

28
Q

What is the purpose of the SJAE/SPE Condenser Bypass Valve (PDV-1719)?

A

Maintains constant d/P 10.83 psid across condensers to ensure adequate and constant condensate flow .
Interlock to start first PCP (must be open)

29
Q

What action is required to raise cooling water flow to SJAE and SPE condensers?

A

Raise d/P setpoint on controller (1ADPD1719)
Valve throttles closed forcing more condensate through the condensers.

30
Q

Why is the SJAE/SPE Bypass Valve (PDV-1719) 100% open when starting the first PCP?

A

Flowpath for PCP Minimum Flow Valve (HV-1710)

31
Q

What are the power supplies for the PCPs and the SCPs?

A

PCP: a) AP102 10A110
b) BP102 10A120
c) CP102 10A102
SCP: a) AP137 10A110
b) BP137 10A120
c) CP137 10A104

.

32
Q

In what order do system automatic actions occur as main condenser vacuum degrades from “full vacuum” to atmospheric pressure on a loss of Circ Water?

A

Intermediate RR Pump runback if loss of vacuum is concurrent with loss 1 CW Pump
Full RR Pump runback if loss of vacuum concurrent with only 2 (or less) CW Pumps running
Main Turbine trip
RFPT Trip
MSIVs shut
BPVs shut

33
Q

A HIGH-HIGH Water Level has occurred in 1A FWHTR. What is the automatic response?

A

Closure of Condensate System Inlet and Outlet valves for 1A, 2A FWHTRs and 2A External Drain Cooler

34
Q

Several tubes have ruptured in FWHTR 2A causing a High-High level trip. What auto action occurs and what is the purpose for this action?

A

1A and 2A FWHTR condensate inlet and outlet valves isolate on high level in FWHTR 2A
Protects the main turbine from water induction

35
Q

Where do RFP seals get cooling and sealing water from?

A

SCP Discharge

36
Q

Plant is at 97% normal alignment
“B” PCP trips. What is the auto response by RPV Level Control and RR?

A

Single PCP trip
RFP’s runback to 86.3%
RR receives runback signal to 45% speed.

37
Q

The unit is at 100%.
BP102 PCP trips.
RPV drops to Level 4
RPV recovers to 35” and is stable.
Assuming no further automatic plant responses occurred, what action is REQUIRED?

A

Should have RR Runback to 45% speed on loss of PCP > 73.65% total feed flow.
FW Flow Runback to 86.3%

Reduce RR pump speeds to 45%.

37
Q

The reactor is at 100% with all Feed and Condensate Pumps are in service
The breaker for ‘C’ SCP trips.
What automatic actions occur?

A

Single SCP Trip
Both RR pumps runback Intermediate (45% speed)
FW flow runback to 89.3%

38
Q

With all condensate and RFPs operating:
1. Loss ONE (1) PCP with feedwater greater than 73.65% will cause a RFP runback to ________________ and a(n) _____________ RR pump runback.
2. Stopping ONE (1) SCP, with feedwater > 73.65% will cause a feedwater runback to ______________ and a(n) _____________ RR runback.

A

86.3%
Intermediate
89.3%
Intermediate

39
Q

Plant is at 97%.
“B” PCP trips.
What is auto response?

A

Single PCP trip
RFP’s runback 86.3%)
RR intermediate runback

40
Q

What is the purpose of the Condensate Drain Tank?

A
  1. Collects drains, from:
    • SPE Shell
    • RFP Shaft Seal Leak off
    • TB Sample Sink
  2. Vacuum drags to condenser.
41
Q

What is the bases for having hotwell level at a certain level?

A
  • 5 min full load reserve
  • # mins retention for short lived radionuclides.
42
Q

What are the shut off heads for the SCP’s and PCP’s?

A
  1. PCP’s - 202#.
  2. SCP’s - 535#.
  3. Combined - 737#

ILOT (93 decks)

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