Lgs Ilt Condensor & Feedwater Week

Front 1

12/22 Bus Loads

Back 1

1) B Cond pps
2) B/D Circ Water pps
3) B Recirc pp
4) *24A (Gen Area), B (Rx Area), C (Turb Area), D (Plant Services) LC
5) *34D (GML) LC
6) *22 2.3 kV Switchgear (SW pps, Schuylkill River B/D pps and M/U pps)

Front 2

11/21 Bus Loads

Back 2

1) A/C Cond pps
2) A/C Circ Water pps
3) A Recirc pp drive motor
4) *14A (Gen Area), B (Rx Area), C (Turb Area), D (Plant Services) LC
5) *44D (TSC) LC

Front 3

actions that result from a generator lockout

Back 3

Unit Protection Relay Energized (Generator Lockout):
1) Output breakers trip open & Turbine trips. (SCRAM if >25%)
2) Exciter field breaker opens.
3) Unit Aux Bus (*1/*2) bus breakers trip open. Fast transfer occurs.
4) Recirc pumps trip (if powered from Unit Aux Trans).
5) Gen Voltage Regulator transfers to MANUAL.
6) SWC pps trip (If caused by 386CX or 386GX, Gen Diff OC, neutral OV/OC ONLY)
7) Main Transformer Cooling Units (Fans & Pumps) trip (386B/F ONLY)
8) Unit Aux Trans Cooling Units Trip (Fans & Pumps) (386 D/H ONLY)
9) Energize generator output breaker failure circuit.

Front 4

Fast Transfer

Back 4

Fast transfer is initiated by a generator lockout.
If a generator lockout is initiated:
• 11 (21) and 12 (22) bus breakers trip
• The selected startup bus breaker closes
o The startup bus breaker that closes is selected by a two position switch for each bus. The 11 unit aux bus has one switch with positions 10-11/20-11. If 10-11 selected, the 10-11 breaker closes.
• Normally selected S/U sources:
o 11 bus to 10 SU bus
o 22 bus to 10 SU bus
o 12 bus to 20 SU bus
o 21 bus to 20 SU bus
The fast transfer will not occur if the feeder bus has a fault, or feeder bus is < 95% rated voltage or if other source is still closed in.

Front 5

DC Distribution for aux power control power

Back 5

(non-safeguard DC controls all 13.2KV breakers)
1) All substation breakers receive their control power from switchyard batteries
2) Switchyard batteries also supply control power to Generator Output Breakers in the MCR.
3) 125VDC non-safeguard (BOP) supplies control power to MCR controlled breakers that are not in the yards.

Front 6

RFP Turbine Trip
manual trip

Back 6

at the turbine (yellow with warning sign attached) or Pushbutton on *0C603

Front 7

RFP Turbine Trip
Low RFP suction pressure

Back 7

233 psig PSL-06-*02A(B,C)
“A” RFP 15 second time delay;
“B” RFP 10 seconds;
“C” RFP 5 seconds.
2 out of 3 logic

Front 8

RFP Turbine Trip
Low Turbine Bearing Oil Pressure

Back 8

<4 psig (2 out of 3 logic)

Front 9

RFP Turbine Trip
Low Pump Bearing Oil Pressure

Back 9

<4 psig (2 out of 3 logic)

Front 10

RFP Turbine Trip
both Thrust bearing Wear Indication probes high

Back 10

> 25 mils

Front 11

RFP Turbine Trip
Low Condenser Vacuum

Back 11

15” Hg Vac PS-M6-*33/PS-M6-*37

Front 12

RFP Turbine Trip
High level

Back 12

1) +54” prevents excessive moisture carryover and turbine blade damage to RFPT’s, Main Turbine, HPCI, and RCIC.
NR Level Instruments
Logic: A or B and C or D Trips all RFPT’s and Main Turbine
2) Must be reset with pushbuttons on *0C603 after level goes below +54”.

Front 13

RFP Turbine Trip
Mechanical Overspeed Trip

Back 13

5700 rpm (108.6% of full load speed)

Front 14

RFP Turbine Trip
Electrical Overspeed #1

Back 14

5700 rpm

Front 15

RFP Turbine Trip
Electrical Overspeed #2

Back 15

5800 rpm

Front 16

RFP Turbine Trip
TM25 Actuator Failure

Back 16

As detected by the Micronet control system

Front 17

RFP Turbine Trip
HPU low pressure

Back 17

100 psig (2 out of 2 logic)

Front 18

RFP Turbine Trip
Loss of both power supplies to feedpump

Back 18

Loss of both UPS and Backup UPS power supplies

Front 19

RFP Turbine Trip
Various MicroNet software and Hardware faults

Back 19

Various MicroNet software and Hardware faults

Front 20

Difference between an emergency trip and shutdown

Back 20

A Shutdown closes the feed pump control valves by driving the actuator to zero. A Trip dumps the oil and closes the feed pump stop valves.

It's is easier to recover from a shutdown.

Front 21

Conditions that initate a Feed Pump Shutdown (3)

Back 21

a. MCR Emergency Stop PB depressed
b. PECO Trip Status input to the MicroNet Control System

c. Normal Shutdown, Any time a speed is intentionally lowered below the "Minimum Governor Speed Setpoint (w/droop)" 600 rpm

Front 22

Relationship between Safeguard Piping Fill System (SPFS) and FW

Back 22

Safeguard Piping Fill System (SPFS) provides a water seal in the feedwater lines to eliminate the potential of Reactor Enclosure bypass leakage through the feedwater containment isolation valves, during a LOCA with concurrent LOOP.

Front 23

RFP Lube Oil System
pump starts

Back 23

a. 2 AC & 1DC
b. Standby pump starts when HP oil header pressure drops below 199# (normally 225#)
c. DC pump starts when AC pumps fail (only supplies oil to bearings, no control oil)

Front 24

Identify the actions required to reset a tripped RFPT.

Back 24

2) Signal causing the trip, as well as other trip signals, MUST no longer be present.
3) Annunciators associated w/all trip conditions must be reset at (20C148 HMI panel 217')
4) Hi Level Trip (if present) must be reset with pushbuttons on *0C603 when level is <+54”
5) “MSC SELECT" light Lit, “LSS” light lit, and “HSS” light not lit (FP is at zero RPM)
6) Reset Trip with switch on *0C603 (vacuum/turbine trip reset, must hold until green light on and red light off)
7) Verify trip reset by stop valves indicated open on *0C-668
* Backup AC and DC Lube oil pumps will auto start due to pressure drop while resetting trip

Front 25

RFPT Turning Gear

Back 25

Provides continuous rotation prior to startups and following shutdowns, for even heating and cooling of Turbine rotor. This is to prevent rotor bowing and distortion.
Manually or automatically engaged, but will Auto engage only once unless reset.

Front 26

HP and LP Stop valves
AUTO OPEN and Close

Back 26

HP and LP Stop valves
- Controlled by turbine trip system
- AUTO OPEN if:
- oil pressure is available
AND
- exhaust valve is full open
AND
- Turbine Trip is reset
AND
- LP valve is closed
- Auto CLOSE on turbine trip

Front 27

HP and LP Control Valves
Control realationship

Back 27

- Operated by speed control system changing the position of the valve rack
- HP valve will NOT OPEN until LP valves are OPEN

Front 28

HP and LP steam supply valve upstream drains

Back 28

- Controls drain flow for all three turbines
- Normally operated from MCR from a common HS
- AUTO OPEN on a Main Turbine Trip signal

Front 29

RFP Stop valve below seat drains

Back 29

- one drain for each stop valve
- AUTO OPEN when associated stop valve shuts
- Can NOT be closed if the associated stop valve is closed.

Front 30

RFP Steam exhaust valve

Back 30

- Can NOT be closed unless the associated HP and LP stop valves are closed

Front 31

Heater string inlet and outlet valve

Back 31

- trips shut on high-high level in either FWH #1 or FWH #2

Front 32

RFP Discharge Check valve

Back 32

- manually controlled from control room
- AUTO CLOSE on RFP turbine trip

Front 33

RFP Recirculation System/
RFP Min Flow valve operation

Back 33

a. RFP Recirculation Valves (FV-C-06-*06A,B,C) maintains min flow requirements for the RFP, discharging to the Main Condenser
CLOSED when:
- RFP is tripped
OR
- LP control valve CLOSED
OR
- Position demand is below 10%
OR
- HIC in MANUAL AND RFPT LP control valve closes

- Valve is OPENED if
o LP control valve is OPEN
OR
o Valve is 60% open when RFP discharge flow is below 0.7 Mlb/hr discharge flow and reduced the position linearly demand to 0% when discharge flow is above 2.9 Mlb/hr.

M/A station in MANUAL
- valve is controled by operator
- closes on a RFP turbine trip and the trip must be bypassed to open manually

b. Air-operated and FO on loss of I/A
c. FC on loss of control power

Front 34

Windmilling Supervisory Instrumentation

and protection step points and actions

Back 34

i. "Normal" prevents suction valve from closing while turbine is rolling AND Turbine Trips protect against windmilling

ii. "Bypass" (keyed switch) windmill protection by suction valve
1. Condenser Low Vacuum (15", reset 11") – maintain lvl in Cond Drain Tk for RFP seals
2. High turbine speed (600 rpm)
3. High vibration (18.75 mils, rest at 12.5)
4. Low bearing oil pressure (pp or turb) (4#)
5. High RFPT exhaust hood temp (400 +/- 8F)

Front 35

RFP Startup Bypass Valve

Back 35

Startup Bypass Valve (LVC-06-*38A) directs flow around outlet valve of heater 6A (HV-108A). Used during startup and shutdown to control level. Design flow with RFP pressure at 1350 to 1400 psig (1.8 x 106 lbm/hour)
b. Air-operated and FAI for a limited time until loss of I/A and valve will FC
c. Used up to 5% power

Front 36

RFP Pump Bypass Valve

Back 36

a. Pump Bypass Valve (HV-006-120 and HV-C-006-220) directs flow around all RFP's and HP Heaters. It is used when reactor pressure is less than 390 psig, and allows for Long Path Recirc or feeding the reactor with a condensate pump during startup and heatup
400 – 600 gpm capacity
b. Air-operated and FAI for a limited time until loss of I/A and valve will FC
c. Flow capacity is a function of the DP across the valve

Front 37

RFP Seal Water System

Back 37

Sealing water supplied by condensate. Seal water supply pressure may be boosted by operating the RFP Seal Injection Booster Pump
b. If the differential pressure between the seal water supply and RFP suction pressures drops too low (30), the Seal Injection Booster Pump will automatically start (provided that a condensate pump is running and the booster pump hand switch is in the AUTO position)
c. It will automatically stop if dP too high (130-140)

Front 38

Woodward Speed control system

Back 38

Woodward Speed control system uses a hydraulic actuator (TM-25LP) which is supplied with hydraulic fluid from it’s own self contained Hydraulic Power Unit. This will control the speed of the RFPT

Front 39

GE Zinc Injection Passivation (GEZIP) System

Back 39

• The purpose of the GEZIP system is to inject zinc into the reactor water and maintain zinc concentration at a predetermined level to reduce Co-60 radiation levels.
• Injected to A/B feedpump suction
• inservice when power >60% and Shutdown when power is <70%

Front 40

Loss of Plant air systems effect on FW system

Back 40

o Recirc Min. Flow valves FV-C-06-*06A,B,C) FAIL OPEN. This reduces flow to the Reactor, and reduces condenser vacuum.
o Pump Bypass Valves and Startup Bypass Valves fails as-is, for a limited time
o HWC system isolates.
o Condensate pump Min Flow valve fails open, FV-C-005-*03

Front 41

Loss of AC power effect on feedwater system

Back 41

o Loss of *1 BUS ® A&C Condensate pps trip ® RFPs limited to 4611 rpm ® possible RFP trip on low suction pressure ® possible Recirc runback
o Loss of *2 BUS ® B Condensate pp trips ® RFPs limited to 4611 rpm ® possible RFP trip on low suction pressure ® possible Recirc runback
o Loss of 480 VAC ® can't close FW discharge valves *08
o Three 120 VAC UPS Inverters (E/S-XX-*18; *19; *20) are installed for providing at least 15 minutes of control power during the loss of the associated Y-panels
o Loss of power to HWC results in system isolation

Front 42

Transfer from startup level control(*38) to pump bypass control (*20)

Back 42

when ALL of the following exist:
LIC -006-*20 in AUTO
AND
LIC-006-*38 output demand < 17% (open)
AND
RPV pressure is less than 390 psig

Front 43

Transfer from the pump bypass control (*20) to the startup level control(*38)

Back 43

all prereqs have to be met
AND
RPV pressure > 400 psig
AND
HV-006-*20 is > than 80% open

Front 44

Recall the following with regards to a RRCS Feedwater runback
a. Conditions causing a Runback.
b. Results of a Runback
c. Conditions required to restore Feedwater Control following an RRCS Runback.

Back 44

1) Minimizes impact of cold FW on ATWS (reduces positive reactivity due to feedwater)'
2) Signal – either division of RRCS
a. High Rx Press (1149 psig) after a 25 sec time delay AND
b. APRM not-downscale >3.2% or if INOP
3) Runback
a. Runback to 2300 rpm
4) After 30 sec time delay
a. White “Manual Control Available” light illuminates
b. The Control Mode of Operation is set as follows:
i. M/A manual (if system was in M/A manual or M/A auto prior to the runback)
ii. MSC (if system was in MSC prior to the runback)
c. The ability to manually transfer to MSC Mode is re-enabled
d. All M/A control permissives are re-instated
e. M/A AUTO control is not available until RRCS is reset

Front 45

List the conditions of the Feedwater system that will cause a Recirc Pump Runback. Include setpoints and bases

Back 45

1) Rx Recirc NPSH Runback (28%)
a. <18.8% total FW flow
2) RFP NPSH Runback (42%)
a. >80.3% total FW flow AND
b. <3 Condensate pumps running
3) Level Restoration Runback (42%)
a. <18.8% flow for any single RFP AND
b. 27.5" Rx Level
4) Rx Recirc Drive Motor Bkr Trip on Loss of Stator Water Cooling
a. Signal sent by total Feed Flow Summer (total feed flow <44%)

Front 46

Recall the events which occur following actuation of the Control Signal Failure Circuitry.

Back 46

1) Occurs when the output from the DFWLC system to the Woodward governor is lost (i.e. signal is <2 or >22; 4-20 mA normal)
2) System Response:
a. Turbine speed locked at signal prior to failure
b. "ALARM 088 FWLC Signal Failure" is generated
c. If the feedpump is being controlled via the M/A station, it will be automatically transferred to the Manual Control (MSC) mode of operation
3) There is no direct indication in MCR that Control Signal is restored
4) If RRCS runback started before failure, runback will continue. If failure occurred first, runback will not occur.

Front 47

Steam Flow Instrumentation

Back 47

a. Four steam flow detectors (A,B,C & D)
b. Total Steam Flow (no failures) = 4 x (A + B + C + D)/4
c. Signal failure
i. A deviation of more than 0.3 Mlb/hr for 3 seconds of any steam line flow signal from the mid-value OR
ii. A hardware failure
d. Total Steam Flow (w/'A' failed) = 4 x (B + C + D)/3
e. Signals in error or repaired signals are automatically disconnected and reconnected via a bumpless transfer
f. If 3 out of 4 steam line flow signals are in error, or if two errors occur simultaneously, an automatic transfer to single-element control takes place

Front 48

Feed Flow Instrumentation

Back 48

g. For Each Feedpump there are
i. TWO physical measurements of Feed flow
1. FT-006-*N002A,B,C designated as the PRIMARY Feed Flow
2. FT-006-*06A,B,C-1 designated as the SECONDARY Feed Flow
ii. ONE Calculation – Used for error detection only, not to control feed flow
1. Pump Speed AND
2. Suction and Discharge pressures (With minflow measurement subtracted)
h. Signal Failure
i. A deviation of 2 Mlb/hr for 1 second OR
ii. A hardware failure (outside of 4-20 mA)

Front 49

Level Instrumentation

Back 49

i. 4 narrow range level inputs (A,B,C, & D)
j. All four signals are used to determine reactor level for control and for +54" trips
k. Reactor Level = (A + B + C + D)/4
i. Only provides a good output when there are 2 or more valid input signals
ii. If there is only one valid input signal, a LEVEL SIGNAL FAILURE condition exists and a FWLC failure will occur
l. For each level transmitter, a failure is defined as:Soft Failure
1. A deviation of greater than 4 inches from the SMS output for 3 secondHard Failure
1. A hardware failure, e.g. outside 4-20mA, on any sensing element used in the calculation
2. Bumpless reconnection of the repaired signal is performed automatically
m. A failed signal is automatically disconnected via a bumpless transfer
n. Bumpless reconnection of the repaired signal is performed automatically

Front 50

Emergency Stop for RFPT MSC control

Back 50

When Emergency Stop is depressed, the control signal to the RFP immediately result in a speed demand of 0.0 RPM. IF the MSC control switch is taken to raise the speed signal will increase until it matches the actual speed of the RFP, at that time RFP speed will respond to the MSC control switch. Operationally the Emergency stop can be used to slow down feed to the vessel. It closes the control valves (uses Woodward to shut the control valves). To recover, simply press Auto Start, which will bring you back up to about 2000 rpm. If you tripped the turbine, you would have to reset the trips. Must manually raise to 2300 rpm. 2300 ~ 850#.

Front 51

Effect of a loss of power on FW level control

Back 51

AC450 - 0-Y109-05 (E/S-XX-*18) and *0-Y201-11 (E/S-XX-*20)
i. Loss of one AC power bus has no effect
ii. Loss of both AC power sources results in loss of control of the Feedwater
iii. When one power source is restored, the FWLC starts up automatically (assuming power is restored within capacity of AC450 batteries). All final control elements start in manual mode
• Loss of both *0C453 power supplies
i. *0C453 RFP min flow control panel
ii. HICs swap to manual
iii. Minflow valves fail open, and will not respond to signal from HICs
• Two of the four channels are powered by separate AC power (feeds A and B), and the other two are powered by the DC power
• Level channel D transmitter is powered by both DC and AC feeds – see components above

Front 52

Recall the purpose of and the conditions causing a FWLC Scram profile and Transfer to Start Up Level Control, including the following:
a. Results of Scram profile.
b. Reset of Scram profile
b. Results of the Transfer to Start Up Level Control

Back 52

1) The profile predicts the steam production after a scram and controls feedwater flow in order to minimize the flow and reactor level transients
2) The profile is also designed to meet the relative runback in the reactor Recirc flow, minimizing thermal stress on the reactor internals caused by non-preheated feedwater
3) Activated by a signal from both RPS A and B
4) When SCRAM Profile is activated (light illuminated):
a. T=0 to10 seconds Total Feedwater Flow is locked at it’s current value.
b. T=10 seconds Total Feedwater Flow is lowered at a rate of rate of 6%/sec to a 10% Feedwater Flow demand
c. 10% Feedwater Flow demand is maintained until Scram Profile is automatically reset
d. If total feedwater flow is less than 10% when the scram occurs (low power scram) the feedwater flow demand is locked to its present value as long as the post scram profile signal is activated. No ramping is performed
5) A Failure of RPS to scram results in a failure of the SCRAM Profile even if ARI worked

Front 53

Recall the purpose of and the conditions causing a FWLC Scram profile and Transfer to Start Up Level Control, including the following:
b. Reset of Scram profile

Back 53

6) The SCRAM profile signal is reset automatically (light extinguished):
a. 20 seconds after SCRAM profile activated AND Reactor water level greater than 20" (I.E. it never went below 20" like on a Low power scram) OR
b. Reactor water level has recovered from below 20” to greater than 20" OR
c. SCRAM Profile has been activated for more than 2 minutes OR
d. Reactor water level is greater than 39" OR
At least one of the RPS channels is reset AND Reactor water level greater than 20"
7) When reset occurs an automatic bumpless transfer to single-element control occurs (single element is selected as total feedwater flow is less than 20%). The reactor water level setpoint ramps slowly from the low-level setpoint to the value set on the FWLC station This slow ramp is called Setpoint Setdown
8) The feedwater control system logic is designed so that whenever reactor level drops below 20" and then recovers above 20" a Setpoint Setdown will occur, regardless of if a valid SCRAM signal is present or not. The level setpoint will then ramp back up to 35" at a rate of 3.6 inches per minute. This may cause reactor level to lower a second time as the system demand will drop to zero when level is at the setpoint

Front 54

Recall the purpose of and the conditions causing a FWLC Scram profile and Transfer to Start Up Level Control, including the following:
b. Reset of Scram profile

Back 54

9) Post SCRAM actions
a. A RFP and one other RFP (B or C) are automatically run back to standby mode (2300 RPM min flow at 60%)
b. In standby mode, RFP A is prepared for bypass control w/Startup Bypass Valve
i. "A" RFP Discharge Valve HV-006-*08A is closed automatically
ii. After the discharge valve is closed: "A" RFP speed increases to maintain a discharge pressure approximately 330 Psig above reactor pressure
iii. Startup Bypass Stop Valve is opened automatically, and the Startup Bypass Valve is opened to 10%
iv. Then the following occur simultaneously
1. Speed of one of the remaining RFPs is ramped down to standby mode
2. The Startup Bypass Valve opens slowly to maintain level

Front 55

DFWLC d/P Mode

Back 55

a. This mode of operation works to always maintain the RFP discharge pressure above reactor pressure. As reactor pressure is increased during startup, the RFP will automatically increase in speed until it's dP is "adequate." At the same time, the *38A valve modulates open and closed based on reactor level

Front 56

Condensate
Min recirc flow valve
Purpose, Open, & Close

Back 56

Functions to ensure adequate condensate pump minimum flow. Ensure adequate condensate flow through the SJAE and SPE to condense the steam required for proper operation.

Valve will OPEN when the sum of condensate flow at the 3rd feedwater heater is less than the (7500 gpm)


Valve will CLOSE on a low condensate header pressure condition (500psi)

Front 57

Condensate filter demins flow control in auto

Back 57

Flow balancing system – maintains a balanced flow rate between the filters. Each vessel has a flow transmitter, controller and positioner that throttles the vessels outlet valve to a desired flow.

The master controller selects the highest signal (most flow restriction) of all vessels in AUTO and adjusts all signals to match until the most restricted filter is at 80% open. On a high influent to effluent header d/p (50 psid) the master controller signal to all vessels is isolated and all vessel outlet valves go to the full OPEN position.

Front 58

Condensate filter demins flow control in manual

Back 58

In MANUAL operation – when the individual flow controller is taken to MANUAL, a solenoid repositions to shut off the air from the main controller so the master controller no longer sees this as the controlling vessel. And the vessels "E" valve will be controlled by that valves flow controller.

Front 59

Condensate filter demin high DP setpoints and resulting actions

Back 59

IF system DP > 50 psi – all valves ramp full OPEN
IF system DP > 54 psi – filter system bypass valve OPENS

Front 60

Condensate deep bed Demineralizers and DP setpoints and resulting actions

Back 60

No flow control system all valves are full open and denergized (If energized PLC logic closes all effluent valves on a instrument power failure)

System Bypass valves
12" – (1 demin capacity) will auto open when system DP > 62 psi for 30 seconds
30" – (full system capcity) will auto open when system DP > 65 psi.

Front 61

Hotwell Level Control

Back 61

Hotwell level control is designed to automatically maintain the desired hotwell level (42.25" to 50.25") via two reject valves (3" for fine control and 8" for coarse control) located downstream of the demins and two make up valves (2.5" for fine control and 8" for coarse control). The reject fine control valve is gagged to maintain constant reject flow of 200 gpm to support reject loads.

Both reject valves close on low condensate header pressure(500 psi) or high CST level (42')

Front 62

Condensate Reject Loads

Back 62

Reject flow supplies:
CRD pump suction
Condensate pump seal water
SJAE and SPE loop seals
Mechanical vacuum pump seal water
Condenser vacuum breaker seal water

Front 63

Condensate pump start

Back 63

NO auto start logic

Pump start permissives are:
Pump suction valve full open
Pump discharge valve full closed

Interlock with discharge valve
- Discharge valve will automatically open 30 seconds after the pump receives a start signal. (if valve is not moving or open after 35 secs pump will trip)

Front 64

Condensate pump trips

Back 64

Pump trips are:
Bus undervoltage
Discharge valve not full open with no motion (35 sec TD from start)

Front 65

Exhaust Hood Spray Valve OPEN interlocks

Back 65

Valve opens when exhaust hood temperatre exceeds 160F
AND
turbine speed is > 95% of rated
AND
load is less than 15% as sensed at LP turbine inlet.

Front 66

Effect of a Insturment air failure on condensate system

Back 66

o Exhaust hood spray temperature control valve – fails closed
o Condensate drain tank level control valve – fails closed, overflows to CRW
o Condensate minimum flow recirculation valve – fails open, desirable on SCRAM
o Hotwell makeup and reject valves – fail closed, hotwell level rises (throttle makeup and reject valves to remedy)
o Condensate filter demineralizer influent and effluent valves – fail as is
o Condensate filter and deep bed demineralizer replenishment valves – fail closed

Front 67

SJAE Recirc Line (PCV-07-141A)

Back 67

o Prevents overloading offgas with excessive amounts of non-condensables. By opening when offgass supply pressure is 7 psi to return excess steam and non-condensables to LP condenser

Front 68

SJAE Steam supply & va;ve interlocks

Back 68

• Main steam normal supply
o Align when >205# RPV pressure via pneumatically operated valve
o 110# normal pressure
• Aux steam during startup
o 125 psig
o Series valves operated from control room

Front 69

Mechanical Vacuum Pump
operating restirctions, start interlocks, trips

Back 69

a. Don't operate >5% power
i. Hydrogen (explosion) venting hazard to TEECE goes to North Stack
ii. No auto isolation to prevent exceeding release rates via North Stack
b. Starting
i. Suction valve opens
ii. Seal water pump starts (seal water cooler needs DWCW)
c. Trips
i. Low seal flow ( 16 gpm, 30 sec TD)
ii. Main Steam Line High Radiation ( 3 x Normal Full Power Background)
1. Trips seal water pump
2. Closes MVP suction valve

Front 70

Purpose for Vacuum breakers

Back 70

a. 4 MOVs Connected to each SJAE line used to break Main Condenser vacuum during Main Turbine shutdown
b. Water seals to prevent a leaking vlv from affecting vacuum during normal ops
• High condenser vacuum after a turbine trip can damage a turbine rotor via thermal sdue to cool air being drawn into the seals

Front 71

Second Stage SJAE Valve Control interlocks

Back 71

• Placing in Service: HV-102 (steam supply) will open first. When 95% open, HV-120 (SJAE condenser air) supply will open
• Taking out of Service: HV-120 (SJAE condenser air) will close first. When 100% closed, HV-102 (steam supply) will close.

Front 72

First Stage SJAE Valve Control interlocks

Back 72

• SJAE condenser cooling must be available
• Placing in Service: Steam supply valves open first then LP condenser air supply valves open
• Taking out of Service: LP condenser air supply valves close and then steam supply valves close
• Isolations:
i. 1st stage air suction valve closes:
1. HV-120 (SJAE condenser air) FC OR high off gas recombiner outlet T (900F) OR Low off-gas inlet flow (9400 lbm/hr – 3480 scfm)
ii. 2nd stage steam or air valve FC – both 1st stage valves shut

Front 73

List and explain the interlocks associated with the SJAE Steam Supply and Air Suction Valves.

Back 73

1) 2nd stage first
a. Cooling water must be established to SJAE condenser first
b. 2nd stage suction valve will open when 2nd stage steam supply is 95% open
c. SJAE condenser drain valve opens when steam valve opens
d. 2nd stage steam supply will only close after 2nd stage suction valve is fully closed

2) 1st stage second
a. Open suction valve to 2nd stage (supply from SJAE)
b. SJAE inlet and outlet condensate valves must be open
NOTE: Steam open first, steam closed last

I. Interlocks
1) 1st stage steam and suction valves auto shut on:
a. 2nd stage suction valve fully shut OR
b. 2nd stage steam supply valve fully shut
2) 1st stage suction valves will also auto shut on:
a. Recombiner outlet high temp (900 deg F)
b. Offgas inlet low flow (3480 cfm / 9400 lbm/hr)

Front 74

Low Condenser Vacuum Pressure actions

Back 74

Condenser Vacuum Pressure
23.5 inches – Low Vacuum Alarm
21.5 inches – Main Turbine Trip
18.5 inches – RFPT Low Vacuum Alarm
15.0 inches – RFPT Trips
8.54 inches – MSIVs Close
7.00 inches – Bypass Valve Close