LC20 Exam 2

• OPERABLE in MODES 1-3
• >= 2 CETs per quadrant in MODES 1-3
• If not restored in 7 days, S/D

• 94% Normal Flow
• 2% Control Rod Guide & Insturment Thimble Tubes
• 1% Inlet to Outlet (Nozzle Bypass)
• 0.5% Baffle Wall Outside FA
• 0.5% Head Cooling

• Temperature(Rx): 650F
• Temperature(PZR): 680F
• Pressure: 2485 psig (excluding PORV & Safeties)

• RCS Subcooling: >25F
• S/G Pressure: Stable or Decreasing
• RCS Hot Leg: Stable or Decreasing
• CETs: Stable or Decreasing
• RCS Cold Leg: At T_sat for P_S/G

• Remove Decay Heat
• Boron Carrier
• Fission Product Barrier (2^nd)
• Reflector
• Moderator

Lower Radial Bearing

3-5% of Normal Flow

15 psig for backpressure on #1 Seal to provide seal to #2 Seal

325 psig

• Means to add:
• - Pure Water
• - Concentrated Boric Acid -OR-
• - Blended M/U

Allows for mass loss or change in Boron in RCS and RWST

Can be used for chem ads

7000 - 7700 ppm

• EB4-1
• MCB or HSP
• No auto functions

Desired flow not w/i (+/-)1 gpm w/i 25 seconds

If alarm occurs, close FCV-110B & 111B

Desired flow not w/i (+/-) 8 gpm w/i 25 sec, then shut 110 & 111B

Locally or Remotely (on Unit 1)

ED1-1 (FC)

• Setpoint: >10%
• Coincidence: 2/4 PR

• Note: When met, it feeds P-7 and:
• - blocks SR trip & de-energizes SR Hi-Volts
• - allows blocking of IR Trip and C-1
• - allows blocking of PR Trip (low setpoint)
• - SR Hi-flux @ S/D Annunciator & Cntmt Evac Alarm Block

• When 3/4 PR Channels >10%, the following are re-instated automatically:
• - IR Trip
• - C-1
• - PR Trip (low setpoint)
• - P-7 removed

• Setpoint: >50%
• Coincidence: 2/4 PR

Note: Generates Reactor Trip if Turbine trips (3/4 channels)

Auto block <50%

• Setpoint: > 48%
• Coincidence: 2/4 PR

Notes: Allows Reactor Trip on low flow in 1 RCS loop (2/3 channels)

Auto blocked w 2/4 < 48%

• Setpoint: N/A
• Coincidence: P-10 or P-13 met

• Notes: With P-7 met, the following trips are re-instated:
• - PZR Pressure Low
• - PZR Level High
• - RCP UV
• - RCP UF
• - Low Flow in 2 RCS loops

Above trips blocked when P-7 is not met

• P-4: Reactor Trip (PROT = Protection Grade)
• P-6: SR Reactor Trip Block (P = Permissive)
• P-7: At Power (P)
• P-8: Three Loop Flow (P)
• P-9: Turbine Trip (P)
• P-10: Nuclear At Power (P)
• P-11: PZR SI Block (P)
• P-12: Lo-Lo T_avg (P)
• P-13: Turbine at Power (P)
• P-14: S/G Hi-Hi Level (PROT)

• C-1: IR Rod Stop
• C-2: PR Rod Stop
• C-3: OTN16 Rod Stop & Turbine Runback
• C-4: OPN16 Rod Stop & Turbine Runback
• C-5: Low Power Interlock
• C-7: Loss of Load
• C-9: Condenser Interlock
• C-11: Contorl Bank "D" Rod Withdrawal Limit
• C-16: Stop Turbine Loading
• C-20: AMSAC

• 1. Unexplained/uncontrolled positive reactivity or C/D
• - Borate unitl under control
• 2. Reactor Trip with > 1 rod not fully inserted
• 3. Failure to Trip
• 4. MODES 1-5 and SDM < 1.3% dk/k
• 5. MODE 6 with boron concentration < COLR -or- NIs indicate reactor critical or near criticality
• 6. Boration required and Reactor MU not available
• 7. Reactor Trip coincidence with loss of DRPI

• Shall be operable in MODE 1 > 50% RTP
• If AFD > Limit, restore immediately
• Verify QPTR within Limits in 12 hours

• Per IPO-10:
• NO Cold Leg openings can exist unless an adequate Hot Leg vent path is established & maintained.

Loss of RHR cooling => steam in system => "blowout" LP seals

• Per STA-620:
• Pull Incore Detecotrs out and into storage locations prior to entry
• If entering Incore Room, detectors are placed in-core.

• Excore Flux Deteciton System calibration
• Monitor QPTR
• Measurement of F_q(Z) and F^N_dH

• >= 75% of the Thimbles
• >= 2 Thimbles per quadrant
• Sufficient detectors, drive, and readout equipment to map these thimbles

• Six Detectors constructed as follows:
• Stainless steel
• Enriched U²³⁵ capsule filled with He gas
• Mineral-insulated cable

• 72 ft/sec (Fast)
• 12 ft/sec (Slow)

(Max LOCAL heat flux on the surface of a fuel rod at Z) / (AVERAGE rod head flux)

(Integral of linear power along the rod with the highest integrated power) / (AVERAGE rod power)

• 3 straps required in Seismic Area
• 2 straps required in Non-seismic Area

• Pressure Band: 1200-2300 psig
• 10-15 minute time delay on pump S/U to allow pump lubrication
• Priming valve will dump N₂ to Atmosphere for 10-20 seconds

• All materials coming in contact with O2 must be FREE of oil, grease, and other combustibles
• No smoking or open flame
• Flow rate of alternate supply >= 1.5 scfm

60 gallons = 1%

• Maintain flow >= 389,700 gpm
• - IF not within limits, maintain thermal power < 85% RTP

NO RCP start IF RCS T_c <= 350F unless secondary S/G water < 50F above each RCS T_c.

• Pump Bearing Temp ~225F OR Seal Inlet Temp ~235F
• - AND -
• 1. RCS Pressure 100-1000 psig
• 2. Seal Leakoff Valves opened on all 4 RCPs
• 3. #1 Seal Leakoff Flow < 1 gpm
• 4. Seal Injection Flow >= 8 gpm

20 gpm = 1%

• No: 2
• Setting: 2335 psig
• Capacity: 210,000 lbm/hr each
• Disch: PRT
• Design: Maintain RCS < HP Rx Trip (2385 psig) during step-load decrease of 50% with rods and steam dumps operating

• Level: 64-88% with RMUW
• Pressure: 1-7 psig N₂ Blanket
• Temp: <113F
• Safety Devices: Two 91 psid rupture discs
• Sparger: Vent hole to prevent siphoning

• Fail to Accelerate
• Locked Rotor

• If < 300 rpm for 10 seconds
• - OR -
• < 600 rpm after 17 seconds

• No.: 3
• Setting: 2485 psig (Full Open at 2560 psig)
• Capacity: 420,000 lbm/hr each
• Indication: Green (Closed); Red (Full Open)
• Design: Maximum surge due to turbine trip with NO reactor trip and none of the following:
• - Auto Rod Control
• - Steam Dumps
• - PORVs
• - Operators

• Verify CCW flow to Thermal Barrier Coolers >= 35 gpm
• If not CCW flow < 35 gpm => Trip Reactor
• If #2 or #3 Seal Failure
• - Pump operation allowed if other parameters (vibration, temp) are satisfied

• No pressure boundary leakage
• 1 gpm unidentified
• 10 gpm identified
• 150 gpd Primary to Secondary per S/G

Fix within 4 hours

NO (4 Indication Lights ONLY)

8 Active (20 Total)

• - Rx Vessel Upper Head (2)
• - Lower Vessel Region (1 N and 1 S)
• - S/G Primary Coolant Inlet (4 - One per Leg)

• 2 events within 1 minute
• Event = detected 3X background

NOTE: Alarm is inhibited during Rod Movement

MODES 1 & 2

• Alarm: 140F
• IF > 110F in Containment, start additional fan cooler
• IF primary seal, isolate and swap to B/U

Drains to RCDT

60 Total:

• 53 CRDMs
• 2 RVLIS
• 4 Thermocouples
• 1 Closure Head Vent

• Each loop >= 551F in:
• MODE 1 - or - MODE 2 with k_eff >= 1.0

If >= 1 loop < limit => MODE 2 with k_eff < 1.0 in 30 minutes

Pressure, Temperature, H/U, and C/D Rates within limits specified in PTLR

IF MODE 1-4 and not met => Restore within 30 minutes

• Normal Letdown and Charging Isolates
• RWST is aligned to CCP suction
• Function as HPSI

• 1. PZR Water Level (RCS Inventory)
• 2. RCP Seal Water
• 3. RCS Chemistry, Boron concentration, M/U
• 4. RCS Fill, Drain, and Pressure Test
• 5. SI Flow

PZR Level Control via FCV-121

Allows most of N¹⁶ radioactivity to decay

• 1. Surge Volume
• 2. M/U Water Addition
• 3. CCP NPSH
• 4. Means for changing boron and dissolved gas concentrations

• Tubes - Charging
• Shell - Letdown

• Fail Position: FC
• Power: Train A
• Auto-Close:
• - PZR Low Level 17%
• - SI Train A
• Manual Reset (Open):
• - 8149A-C must be closed
• - PZR Level > 17%
• - No SI signal

• Fail Position: FC
• Auto-Close:
• - LCV-460/459 off open seat
• - PZR Level < 17% (1/2 Channels)
• Manually Open:
• - 460/459 Open
• - PZR Level > 17% (2/2 Channels)

• Orifice A: 45 gpm
• Orifice B: 75 gpm
• Orifice C: 75 gpm

• 8160
• 8152

• 8112
• 8100

• 5385 / 5385A (HELB) <= 200 psig Alarm
• Hi Flow >= 140 gpm

• FO
• Solid Plant Pressure Control
• Normally maintains upstream pressure at 310 psig

Fails to VCT

• In Auto:
• - 62% = Starts to modulate to RHUT
• - 98% = Fully diverted to RHUT

• 25-60%
• 25% = 0% RTP
• 60% = 100% RTP

Cooling and cleanup during S/D

• 112
• 2%: Lo-Lo Level
• - 112D/E Open (2/2)
• - 112B/C Close
• 16%: Lo Level
• 46%: Begin M/U
• 56%: Secure M/U
• 62%: 112A begins modulation
• 70%: Hi Level
• 98%: 112A to RHUT (Alarm)

• 185
• 2%: Lo-Lo Level
• - 112D/E Open (2/2)
• - 112B/C Close
• 16%: Lo Level
• 46%: -N/A-
• 56%: -N/A-
• 62%: -N/A-
• 70%: Hi Level
• 98%: 112A to RHUT

Auto-Close on:

• - (2/2) 2% VCT Level
• - Train A SIS (Train B)
• - 112D Open (112E)

• CCP suction High Point Vent
• Auto-close when LCV-112B/C Close (Train Related)
• Auto-open when LCV-112B/C Open (Train Related)

• 1. Lo Lube Oil Pressure (<4 psig)
• 2. Train A SI
• 3. UV on EB1 Bus
• 4. Overcurrent

• Auto-Starts:
• - SI (Associated Train)
• - BO (Associated Train)

• Trips:
• - UV (Associated Train)
• - 86 Lockout (Associated Train)

• Power: EA1(2)
• Control Power: ED1(2)

• Oil Pump Auto-Start: 14 psig
• Oil Pump Auto-Stop: 19 psig

• Capacity: 60 gpm / CCP
• Auto-Close: SI

• 19 psid - Hi D/P
• 0.45 - 23 Micron

• 1. Letdown Isolation (PZR Level < 17%)
• 2. Chargin Pump Flow Regulation (FCV-121)
• 3. Heaters

• Heaters
• Spray
• PORVs
• Safeties

• In Service: 100 ppm (can put into service at 200 ppm)
• D/P: 40 psid
• Flow: 164 gpm
• Capability: 300 gpm with 2 beds in service

• Number: 5
• Purpose:
• 1-2 Crud Burst Cleanup
• 3-5 Dilution

TIS-382 = 155F Alarm and TCV-129 diverts to bypass BTRS Demins

TE-381 = 150F Alarm

Inadequate Core Cooling (ICC)

• 1. < 4 gpm
• 2. Close when RCS [B] < 250 ppm to prevent indavertent boration during Auto or Manual M/U

L_pzr Power T_ave

• 25% 0% 557F
• 60% 100% 585.4F 589.2F U2

Accomodate (without a RX Trip)

• - Load/Unload => 5% per minute with Auto Rods
• - Instantaneous Load => 10% with Rods
• - Step Load Reduction => 50% with ¹Rods and ²Steam Dumps

2385 psig

2185 psig

1960 psig

1880 psig

1820 psig

• Level Deviation >= 5% above Program Level
• => B/U Heaters energize (Cold Water Insurge to PZR)

• 1. SI
• 2. L_pzr < 17%
• 3. Low Bus Voltage

• 530F to 535F
• Chem & [B] of PZR liquid in equilibrium

• PORV-455A (Channel 458)
• PORV-456 (Channel 457)

100 times in 10 minutes

(1) ¹Local switch in "Remote" and CR switch in "Auto" with ²no SI or BO OLs and ³Room Temp 104F.

(2) ¹Local switch in "Remote" and CR switch taken to "On" and ²no SI or BO OLs

(3) Local switch in "On"

(4) SI (Step 9)

(5) BO (Step 10)

• 1. Non-sparking wrenches
• 2. Ensure truck is grounded
• 3. Explosive Range: 4-75%

• All plant buildings EXCEPT:
• 1. Safeguards
• 2. Aux Building
• 3. Fuel
• 4. Control Room

• SI & BO: UPS A/C, 1E Battery Fans, EFCUs
• BO: Train C Fans (Load shed on SI)
• OSA / ECB Ventilation: Shunt Trip on SI (Nothing on BO)

Maintain UPS Distribution Rooms and AC Equipment Rooms <= 104F during Normal, Abnormal, and Emergency operations

Room => Particulate Air Filter => Cooling Coil (Safety Chill Water) => Fan => Room

Unit 1 Train A SFGD CCW Loop

Unit 2 Train B SFGD CCW Loop

• Aligned for Redundancy:
• A/C skid mounted air compressor
• Instrument Air

Maintains 180-200 psig refrigerant pressure exiting the condenser

OSA Shunt Trips on SI (EITHER Unit)

BO ONLY

• SI (Step 9 on Sequencer)
• BO (Step 10 on Sequencer)

Fusible Link at 165F

• 1. Supply Fan Low D/P
• 2. Booster Fan Low D/P
• 3. MLB Lit when Booster Fan is running

• 1. Compressor Overload
• 2. Air Compressor Motor Overload
• 3. Low Oil Pressure
• 4. High Refrigerant Pressure
• 5. Booster Fan Overload

MODES 1-4

>= 70F

>2150 psig PROHIBITED

• Trip: Lo-Lo DWST (13%)
• Auto Start: On pump trip

• 1. CCW Surge Tank
• 2. CVCS Blender & Chem Add
• 3. SFPCS
• 4. Safety Chill Water Surge

• 1. Auto Close: Hi Level in RMUWST (98%)
• 2. Open from LV-18

• 1. RMUWST Lo-Lo (25%)
• 2. SI, BO (Restart when clear)
• 3. Overload (when Level > 69%)

When RCS Temp > 180F, [O₂] < 100 ppb

Prevent Dilution Accident

Not required for S/D, but necessary to stay S/D > 24 hrs

• 1. <69% => No overload protection
• 2. Must be monitored for cavitation

< 120 psig

• 1. Unit aligned - 33,000 gallons (53%)
• 2. Units aligned - 51,000 gallons (69%)

• Bearing: >= 195F (Motor)
• Stator: >= 300F (Motor)
• Pump Bearing: >= 225F (Past Thermal Barrier)
• Seal Water Inlet: >= 235F (Past Radial Bearing)
• Loss of Seal Injection: Thermal Barrier Cooling (< 1min)

• VIBRATION:
• Shaft: >= 20 mils -OR- 15 mils & increasing > 1 mil/hr
• Frame: >= 5 mils -OR- >3 mils & increasing > 0.2 mil/hr

• 1 RCP > 48% (P-8)
• 2 RCPs > 10% (P-7)

NO

Prevents de-energized pump from rotating due to reverse cooling flow

Cannot start RCP until oil pressure reaches 600 psig

• 1. Start 1 RCP at a time
• 2. 2 successive starts, provided pump motor is allowed to coast to a stop (5 minutes)
• 3. 3^rd start allowed if:
• - Running >= 20 minutes
• - Idle >= 45 minutes (allows for cooling of winding & core)

> 6 gpm (prevents high temp water from reaching #1 Seal)

>= 0.2 gpm at ALL TIMES

• Mode 5 with Steam Bubble: >=250 psid
• Mode 5 with PZR Solid: >= 200 psid
• Mode 3 or 4: >= 200 psid

• Total: 8 gpm
• - 5 gpm through Thermal Barrier into RCS
• - 3 gpm through #1 Seal to Filter & HX (Shaft-keyed runner on seal housing ring)
• - 3 gph through #2 Seal to RCDT
• - 800 cc/hr from RCP Seal Standpipe through sealing dams to Cntmt Sump

• U1 (D-76)
• U2 (D-5)