Text

Initial Exam 2011-302 Draft RO Written Exam (Part 3 of 3)
	ML12073A203
Person / Time
Site:	Watts Bar
Issue date:	04/29/2011
From:	; Operator Licensing and Human Performance Branch
To:	; Tennessee Valley Authority
References
	50-390/11-302
	Download: ML12073A203 (257)
	v • d • e

3-OT-SYSO57P Rev 12 Page 7 of 106 pages V. TRAINING OBJECTIVES: (continued)

A R S S U 0 R T 0 0 A X X X 16. Correctly locate control room controls and indications associated with the 1 25v DC Vital system, including:

a. Alarms

b. Voltmeters

c. Ammeters X X X X 17. Describe the in-plant location of:

a. 1 25v Vital Batteries

b. 1 25v Vital Battery Boards

c. 1 25v DIG Batteries

d. 250v Batteries

e. 250v Battery Boards

f. 250v Turbine Bldg Distribution Bds

g. 1 25v Vital Battery Chargers

h. 125v Vital Inverters

i. 48v Telephone Battery

j. 48v Plant Battery

k. 24v CAP Battery

WBN 10-2011 NRC RO Exam As Submitted 8/15/2011

51. 064 K3.01 051 Given the following:

- Unit 1 trips due to a safety injection actuation.

- Two minutes after the safety injection, offsite power is lost.

- Diesel Generator lA-A trips twelve seconds after connecting to its shutdown board.

Which ONE of the following identifies how the loads being sequenced onto the shutdown board are affected?

A. Load breakers already connected remain connected; load breakers waiting on the sequencer will not close.

B. Load breakers already connected remain connected; load breakers waiting on the sequencer will close upon completion of the time delay.

C Load breakers already connected will trip open; load breakers waiting on the sequencer will not close.

D. Load breakers already connected will trip open; load breakers waiting on the sequencer will close, then trip open, upon completion of the time delay.

Page 133

WBN 10-2011 NRC RO Exam As Submitted 8115/2011 DISTRA CTOR ANAL YSIS:

A. Incorrect, Plausible because there are breakers (such as feeder breakers to the 480v shutdown boards) that do not trip when a 6.9kv shutdown board loses voltage and one of the functions of the undenioltage relays actuated due to the loss of voltage to the board is to lockout the losing circuit of the breakers feeding from the board to prevent closure of the breaker.

B. Incorrect, Plausible because feeder breakers on the board would not trip open like the motor breakers do and the sequencer timers have been initiated and will time out.

C. Correct, After a loss of voltage to the board following the diesel trip, an undervoltage relay on the board will cause all motor breakers that are closed to be tripped open and the losThg circuit of all motor breakers to be locked out preventing breaker closure.

D. lncorrect Plausible because the loss of voltage to the board following the diesel trip results in an undervoltage relay on the board tripping all closed motor breakers and sending a trip signal all motor breakers on the board, so that if they attempted to close, the breaker would trip free. However the relays also lock out the closing circuit of any breaker feeding from the board to prevent any attempt of the breaker to close.

Page 134

WBN 10-2011 NRC RO Exam As Submitted 811512011 Question Number: 51 Tier: 2 Group 2 KIA: 064 K3.01 Emergency Diesel Generator (ED/G) System Knowledge of the effect that a loss or malfunction of the ED/G system will have on the following:

Systems controlled by automatic loader Importance Rating: 3.8/4.1 10 CFR Part 55: 41.7 / 45.6 IOCFR55.43.b: Not applicable K/A Match: K/A is matched because the questions requires knowledge of how a diesel generator failure will affect load that have been connected during a blackout sequence as well as loads waiting on timers to allow the load to be sequenced on to a shutdown board.

Technical

Reference:

1-45W724-1 R25 1-45W760-74-1 R12 Proposed references None to be provided:

Learning Objective: 3-OT-SYS2O1A

1. Identify the 7 plant 6.9kV Bds & buses and describe each:

e. Protection on the supplies and feeders for each Bd.

Cognitive Level:

Higher X Lower Question Source:

New Modified Bank Bank X Question History: WBN Bank question Comments:

Page 135

3-OT-SYS2O1 A Rev 12 Page 4 of 136 pages I. PROGRAM: WATTS BAR OPERATOR TRAINING II. COURSE:

A. License Training B. NOTP (Including Electrical 2B)

C. LICENSED REQUALIFICATION D. NAUO REQUALIFICATION III. TITLE:

6900V AC BOARDS AND BUSES IV. LENGTH OF LESSON:

A. LICENSE TRAINING 2.0 HOURS B. NOTP 4.0 HOURS Licensed & NAUO Requal Times to be determined when Objectives are identified.

V. TRAINING OBJECTIVES:

Identify the 7 plant 6.9kV Bds & buses and describe each:

a. Location and Number of Bds in the plant.

b. Normal, Alternate, & Control power to each Bd.

c. Purpose/function of each Bd.

d. Feeds from each Bd.

e. Protection on the supplies & feeders for each Bd.

f. Transfer schemes by using a breaker schematic.

g. Indications on each Bd.

2. Describe the 6.9kV Electrical System by drawing a simplified diagram including all 6.9kV Bds and buses and supplies to each.

3. Draw and describe a typical 50, 51, 51 X, 83 relay motor protection scheme on a 6.9kV Unit Bd.

4. Explain the Purpose of the 51 G relay.

5. Explain the electrical print for a 6.9kV RCP Bd. Transfer scheme.

3-OT-SYS2O1 A Rev 12 Page 5 of 136 pages V. TRAINING OBJECTIVES: (continued)

A R S S U 0 R T 0 0 A x x x 6. Explain electrical print for a 6.9kV Common Bd. transfer scheme.

I x 7. Discuss how to de-energize a piece of equipment in the following circumstances:

a. Normal

b. Manually

c. Without the equipments breaker, during an emergency x 8. Explain Purpose for the 27R relay on a 6.9kV Unit Bd.

x 9. Discuss how voltage is maintained on the 6.9kV Shutdown Bds.

x 10. Explain the Design Basis of the 6.9kV Shutdown Power system per FSAR 8.3.1.1.

x 1 1. Explain the electrical print for a 6.9kV SD Bd. transfer scheme.

12. Given condition/status of a 6.9kV Shutdown Bd.

system/component and appropriate Tech Specs, determine if operability requirements are met and what action is required.

13. Identify the 6.9kV Shutdown Bd. parameters governed by T/S.

14. Explain the Purpose of the 161 kV Contingency scheme.

(Objective is applicable after Unit 2 operation is established.)

15. List the 3 positions of the 161 kV Contingency switch and explain the function of each. (Objective is applicable after Unit 2 operation is established.)

x x 16. Identify the Arming signals for Load shedding.

(Objective is applicable after Unit 2 operation is established.)

3-OT-SYS2O1 A Rev 12 Page 6 of 136 pages V. TRAINING OBJECTIVES: (continued)

AR S S U OR T 0 0 A X X 17. Evaluate the effects of load shedding on the plant after trip of both units and an undervoltage on either 6.9kV Start Bd.

(Objective is applicable after Unit 2 operation is established.)

X X X 18. Explain the 6.9 kV Equipment Operating Guidelines concerning Motor Operating and Starting Limits.

X X X 19. Describe the specific starting duty limits on the RCPs.

X X X 20. Identify onsite power system Voltage Limits per SOI-21 1.01-04.

X X 21. Identify consequences of abnormal conditions in or improper work on electrical distribution systems, and include what those conditions are. SOER 90-001, Rec. 4 X X 22. Correctly locate control room controls and indications associated with the 6.9kV systems, including:

a. CSSTs A, B, C, D

b. 6.9 kV Start Bus Bds A & B

c. RCP Start Buses A & B

d. RCPBds

e. 6.9 kV Unit Bds

f. 6.9 kV Common Bds

g. 6.9 kV Shutdown Bds X X X 23. As a minimum participant should use prints 15E500-1 & 2 to locate and identify the following:

a. CSSTs A, B, C and D

b. 6.9 kV Start Bus Bds A & B

c. RCP Start Buses A & B

d. RCP Bds

e. 6.9 kV Unit Bds

f. 6.9 kV Common Bds

g. 6.9 kV Shutdown Bds

3-OT-SYS2O1 A Rev 12 Page 7 of 136 pages V. TRAINING OBJECTIVES: (continued)

24. Picking one of the 6.9 kV Bds (Unit, Common, or Shutdown), participant should locate and identify the following:

a. Normal Supply Breaker

b. Alternate Supply Breaker

c. Voltmeters

d. Ammeters

e. Watt-Hr Meter

f. Protective Relays:

(1) 87 Differential (2) 51 N Neutral Overcurrent (3) 51 Overcurrent (4) 27 Undervoltage VI. TRAINING AIDS A. Marker Board and Markers B. Computer and Multimedia Projector VII. TRAINING MATERIALS:

A. WBN Prints: (Prints will vary with objectives covered)

1. 15E500-1,-2

2. 1-45N713

3. 45W714

4. 1-45W715

5. 1-45W720

6. 1-45W721-1,-2

7. 1 -45W724-1

8. 1 -45W760-200-1, -2, -3, -4, -5

9. 1-45W760-201-1, -2, -3

10. 1-45W760-211-1, -2, -3, -4, -6, -17, -18

11. 1 -45W760-68-1, -2, -5, -6

12. 75W502&503 B. Student Training Guide 3-OT-STG-0201A, 6.9kV System

A rr in r -

27S1A (OA & OC) Load shed MA I NTE I FROM 6 sensors set at 70% (-3 second delay)

BD lB PERMIT AUTO

27D1A (0A & OC) Bus voltage less CLOSING OF BKR 1912 than 70% DG start sensor (-.5 second delay)

BETWEEN 3 TO 5 SEC. TRIP BKR 1716,

27DAT, 27DBT, 27DCT 96% degraded 17181932 ALL MOTOR BKRS, ALL P 1932 ELECTRICALLY OPERATED BKRS ON 1932, 51 i 48OV SHDN BDS 1A1A & 1A2A EXCEPT voltage sensor. 2 out of 3 picks up 8,1716. CNTMT AIR RETURN FAN. LOWER COUPT

-ix BETWEEN .5 TO 1 .5 SEC. COOLING FAN AND CRD COOLING START DIESEL GENERATORS FAN: INITIATE BLACKOUT DS-1 & DS-2 timers 1AA,1BB,2AA,2BB SIGNAL AND INTERLOCK ALL SEQUENTIAL TIMERS.

rI j UV ANN. & SIC COMPUTER ANN. ,_..

1912

DS1, DS2 Degraded voltage 10 second timers.

DS Degraded voltage trip (1 of 2 DS1 or DS2). Trip feeders and initiate load shed.

27LVA, LVB, LVC 87% bus low voltage sensor

LV1, LV2 .75 second low voltage timers (picked up by 2 of 3 27LV)

LV Trip Normal, Alternate and Maintenance Bkrs (1 of 2, Lvi or FDR CKT LV2)

Shutdovn Board Key Diagram 45W760-211-1

F rA IT - I fl f

AX932 I CX932 Alternate feeder voltage available set at -95% (close interlock for Alternate BRK)

AX912 I CX912 DG voltage available BETWEEN 3 TO 5 SEC.

2 1718,1932 ALL MOTOR I

/ ELECTRICALLY OPERATEI set at 95% (DG breaker auto close 480V S[1DN RDS 1A1A 1,,, CNTMT AIR RETURN FAN BETWEEN .5 TO 1.5 SEC. COOLING FAN AND CR0 permissive)

START DIESEL GENERATORS FAN: INITIATE BLACKO 1AA,1B8,2AA,2BB SIGNAL AND INTERLOCK UV ANN. & SIC COMPUTER SEQUENTIAL TIMERS.

ANN.

59 Overvoltage annunciator input set at 105% (8 second time delay)

R716, R718, R932 Auxiliary relays on Maint., Norm, & Alternate BKR trip circuits. Energize when breaker handswitch placed to CLOSE.

Energized to remove the trips from the DV, LV, and load shed relays to allow operations to energize a dead SD Bd from offsite power source.

Shutdovn Board Key Diagram 45W760-211-1

WBN 10-2011 NRC RO Exam As Submitted 811512011

52. 073 K1.01 052 Given the following:

- Annunciator 186A, MCR INTAKE O-RM-90-1 25/1 26 RAD HI, alarms.

- Both O-RM-90-125, MCR INTAKE and O-RM-90-126, MCR INTAKE have the RED light LIT on O-M-12.

Which ONE of the following describes the Main Control Room ventilation alignment?

The MCR is maintained at a A. positive pressure by the Main Control Room Air Handling Units.

B. negative pressure by the Main Control Room Air Handling Units.

C. negative pressure by the Control Building Emergency Cleanup Fans.

D positive pressure by the Control Building Emergency Air Pressurization Fans.

Page 136

WBN 10-2011 NRC RO Exam As Submitted 8115/2011 DISTRA CTOR ANAL YSIS:

A. Incorrect, RM-90-125 and 126 initiate a CR!. A CR! isolates the ductwork from the Control Building Air Pressurization Fans and starts the Control Building Emergency Air Pressurization Fans. A positive pressure is maintained to minimize outside contaminants from enterhg the MCR. Plausible since this is the normal ventilation fiowpath/pressure condition in MCR.

B. Incorrect, RM-90-125 and 126 initiate a CR!. A CR! isolates the ductwork from the Control Building Air Pressurization Fans and starts the Control Building Emergency Air Pressurization Fans. A positive pressure is maintained to minimize outside contaminants from entering the MCR. Plausible since other areas (e.g. Aux Bldg) are maintained at a slight negative pressure during normal and abnormal conditions.

C. Incorrect, RM-90-125 and 126 initiate a CR!. A CR! isolates the ductwork from the Control Building Air Pressurization Fans and starts the Control Building Emergency Air Pressurization Fans. A positive pressure is maintained to minimize outside contaminants from entering the MCR. Plausible since other areas (e.g. Aux Bldg) are maintained at a slight negative pressure during normal and abnormal conditions.

D. Correct, RM-9O-125 and 126 initiate a CR!. A CR! isolates the ductwork from the Control Building Air Pressurization Fans and starts the Control Building Emergency Air Pressurization Fans. A positive pressure is maintained to minImize outside contaminants from entering the MCR.

Question Number: 52 Tier: 2 Group 1 K!A: 073 K1.01 Process Radiation Monitoring (PRM) System Knowledge of the physical connections and/or cause-effect relationships between the PRM system and the following systems:

Those systems served by PRMs Importance Rating: 3.6 / 3.9 10 CFR Part 55: 41.2 to 41.9 / 45.7 to 45.8 10CFR55.43b: Not applicable K/A Match: This question matches the K/A by having the candidate determine the cause-effect of Rad Monitors 0-RM-90-125 & 126 and the Control Room Ventilation system.

Page 137

WBN 10-2011 NRC RO Exam As Submitted 8/1512011 Technical

Reference:

1-47W61 1-31-1 R23 SOl-31.01, Control Building HVAC System, Rev. 0051 N3-300B-4002, Control Building Heating, Ventilation, Air Conditioning, and Air Cleanup System, Revision 16 SO1-30.05, Auxiliary Bldg HVAC Systems, Revision 0051 Proposed references None to be provided:

Learning Objective: 3-OT-SYSO3IA

3. Describe the ventilation flow path provided by the control building ventilation system during normal and emergency operation.

Cognitive Level:

Higher Lower X Question Source:

New Modified Bank Bank X Question History: SQN bank question CB Vent-B.4.G #1 used on the SQN SEPT 2010 NRC exam. Made wording changes in the stem, relocated the correct answer and changed one distractor. Modification is not significant.

Comments:

Page 138

TVA

Title:

CONTROL BUILDING HEATING, VENTILATING, AIR N3-3OCB-4002 CONDITIONING, AND AIR CLEANUP SYSTEM 1.0

SUMMARY

1.1 General Description The Control Building Heating, Ventilating, Air-Conditioning, and Air Cleanup (HVACAC) system consists of the following subsystems:

a. Main Control Room (MCR) air-conditioning (including the Technical Support Center)

b. Deleted

c. Control Building emergency pressurization

d. Control Building emergency air cleanup

e. Electrical Board Rooms (EBR) Air Conditioning

f. Spreading room ventilation

g. Battery rooms exhaust

h. Toilet and locker rooms exhaust

i. Deleted

j. Humidification

k. Computer room supplemental air conditioning

1. Communications room supplemental Air Conditioning Refer to Section 3.0, System Description, and Section 8.0 Figures for description of each subsystem.

The Control Building HVACAC system is designed to maintain the temperature and humidity in the building for personnel comfort, protection and operation of plant controls, and to provide safe, uninterrupted occupancy of the NCR habitability zone (MCRHZ) during normal, accident, and postaccident recovery conditions. The MCR equipment is capable of operating within the temperature range listed in WB-DC-40-42 (Ref. 7.2.6) . The MCRHZ, with a total volume of approximately 260,000 ft . includes all rooms on El 755.0 of CB.

3 During normal plant operation, outside air is supplied to the control building to replace exhausted air and to makeup for outleakage from the building. To

,m minimize air inleakage, the Control Building Habitability Zone is maintained

\ at a positive pressure with respect to adj acent spaces and the outdoors. Upon

.j ,,\ receipt of a Safety Injection Signal (SIS) or upon indication of high radiation or smoke concentrations in the outside air supply to the building, the MCRHZ is automatically isolated. The system maintains the MCRHZ at the positive pressure relative to the pressures of the outdoors, surroundings and the adjacent shutdown board room by recirculating the air through high-efficiency particulate air (HEPA) filters and charcoal adsorbers, and supplying a small amount of outside air for pressurization.

The MCRHZ may be manually isolated at any time by the control room operator.

1

TVA

Title:

CONTROL BUILDING HEATING, VENTILATING, AIR N3-3OCB-4002 CONDITIONING, AND AIR CLEANUP SYSTEM Relay Room, DPSO Engineers Shop, Operations Office, Assistant Shift engineers office, technical support center, NRC office, conference rooms, kitchen, toilet, locker rooms, and the mechanical equipment room at El 755.0. Air is taken from the MCRHZ, filtered and cooled by the operating AHU, then returned to the MCRHZ. Each AHU is belt-driven, and is supplied with isolation dampers which close when the AHU is not operating. Makeup air from outside is drawn by AHU through the return ductwork for pressurization of MCRHZ during normal operation, or by the emergency pressurization subsystem during isolation conditions.

The MCR A/C subsystem operates during normal and isolation modes. It provides a controlled environment for the operators and for the equipment in the MCRHZ spaces. This subsystem is safety-related.

Thermostats in each train of this subsystem are designed to maintain the MCRHZ between 60°F and 104°F during all modes. One train operates while the other is on standby. The standby train will start if sensors on the operating AHU detect low airflow, high AHU inlet air temperature, or low differential pressure across the operating chilled water pump. Failure of the operating train for any of these cases is alarmed in the MCR.

Humidistats in main supply ducts are designed to maintain the MCRHZ relative humidity at approximately 50% during normal operation.

During isolation conditions, CR1 dampers close to isolate the MCRHZ from the outside environment. These dampers, which are tight sealing with resilient seals along blade edges are located in various Control Building HVACAC subsystems, and are listed in Section 9.0, Table 9.1. The dampers automatically close, within 14 seconds (Ref. 7.4.19) for the following conditions: high radiation in the outside air intake, smoke concentrations in the intake air supply, or receipt of a Safety Injection Signal (SIS) . Isolation valves FCV-03l-3 & -4 should not close sooner than 11 seconds (Ref. 7.4.19). However, valves 0-FCV-3l-3 & -4 may close sooner than 11 seconds if a positive MCRHZ pressure of 0.125 W.G. minimum is maintained during the transition from the normal to CR1 mode. See Section 6.0 for details. In addition, the CR1 signal automatically de-energizes both trains of Shutdown Board Rooms Pressurizing Supply Air Fans B-A, B-B, A-A and C-B in the Auxiliary Building El 757.0. The MCRHZ can also be manually isolated by the operator. Upon CR1 reset, the outside air supply and exhaust isolation dampers open. This signal can be reset only if the initiating signal no longer exists.

3.1.2 Deleted.

3.1.3 Control Building Emergency Pressurization Subsystem (Ref. 7.4.14)

The control building emergency pressurization subsystem consists of two 100% trains, designed to supply a reduced stream of outside air to the MCR A/C system to keep the MCRHZ area at 0.125 WG minimum positive pressure with respect to outdoors and all surrounding areas (for all modes of operation except during a tornado warning) . During CR1 operation mode, this positive static pressure will prevent the infiltration of radioactive gases from the areas surrounding the MCRHZ. These areas are the Turbine Building (atmospheric pressure), El 757.0 of the Auxiliary Building (atmospheric pressure), and the spreading room. Each train of the emergency pressurization subsystem consists of a direct-driven vane-axial fan and associated ductwork, dampers, instrumentation, and controls.

9

TVA

Title:

CONTROL BUILDING HEATING, VENTILATING, AIR N3-3OCB-4002 CONDITIONING, AND AIR CLEANUP SYSTEM Differential pressure indication between the MCRHZ and the Cable Spreading Room, MCRHZ and outside atmosphere, MCRHZ and Stairwell Cl, and MCRHZ and Auxiliary Building 6.9 KV Shutdown Board Rooms El. 757.0 are provided to insure that the required positive pressure is maintained in the MCRHZ by MCR A/C subsystem during normal plant operation (except during a tornado warning) . The time delay relay in the differential pressure indicating circuit for MCRHZ pressurization is provided to eliminate nuisance alarm in the MCR. Inadequate differential pressure in MCR will alarm.

A flow switch on the air discharge of each AND starts the standby train and shuts down the energized train on low flow. Failure of the operating train is alarmed in the MCR.

3.3.1.2 Deleted 3.3.1.3 Control Building Emergency Pressurization Subsystem The status of each emergency pressurization fan and damper is indicated by lights in the MCR.

During the CR1 the positive pressure is maintained in the MCRHZ by Control Building Emergency pressurization subsystem. If any one of four pressure differential transmitters sensing the MCR pressure relative to the outdoor and surrounding areas senses below 0.125 WG, its pressure differential switch sends a signal to automatically start the standby emergency pressurization fan to correct the MCRHZ pressure back to above 0.12511 WG

/7 ()1 positive pressure.

3.3.1.4 Control Building Emergency Air Cleanup Subsystem Status of each air cleanup fan and its associated dampers is indicated by lights in the MCR.

During the CR1 the positive pressure is maintained in the MCRHZ by Control Building Emergency pressurization subsystem (except during a tornado warning) . If any one of four pressure differential transmitters sensing the MCR pressure relative to the outdoor and surrounding areas senses below the 0.125 WG, its pressure differential switch sends a signal to automatically start standby emergency pressurization fan to correct the MCRHZ pressure back to above 0.125 WG positive pressure.

A temperature indicator is located on the outlet of each emergency air cleanup filter assembly charcoal adsorber bed.

Pressure differential indicators across the HEPA filter and the charcoal adsorber allow periodic surveillance of dust loadings and pressure drops on individual components in filter trains.

21

WBN Control Building HVAC System SOI-31.01 Unit I Rev. 0051 Page 37 of 107 6.0 NORMAL OPERATION A. Fresh air is continuously supplied to the Control Bldg to replace exhausted air and to provide makeup for outleakage. The Control Bldg is maintained at

+1/8 in. H 0 relative to atmosphere to minimize air inleakage. The Control Bldg 2

W t.V air-conditioned spaces are maintained 80°F and 5O% relative humidity for protection of instruments and for the comfort and safety of the operators.

B. Spreading Room is maintained at a negative press relative to Control Bldg.

C. Control Bldg Pressurization Fans have fan blades positioned in parallel with air flow. Control Dampers 0-FCO-31-01, -02, -01A, -02A are secured full open.

Balancing Damper and ductwork are installed from Pressurization Fans discharge duct to Air Handling Unit inlet duct.

D. Computer Room Supplemental Cooling is provided from either of two AHU5 located on a platform in EL 708 corridor outside computer room. Each AHU can receive safety-related (trained) chilled water from the EBR chiller piping systems. Isolation valves shall be aligned such that only one supplemental chilled water loop shall be in-service at any time. The chilled water loop which is NOT in-service shall have its isolation valves closed to preclude cross-connecting the EBR Train A and Train B chilled water headers. The temperature controller should be set for 68 degrees.

E. Applicable Attachments will be performed at discretion of Operations Superintendent or designee. Attachments will normally be performed for System Alignment Verification in Mode 5 or whenever alignment verification is needed.

F. The MCR steam generator (humidifier) shall be in service any time the relative humidity in the MCR is <50% as indicated at the MCR AHUs. Humidity levels of less than 20% may affect function of touch screens and will affect operability of Unit 2 Common Q PAMS.

WBN Auxiliary Bldg HVAC Systems SOl-30.05 Unit I Rev. 0051 Page 8 of 111 30 PRECAUTIONS AND LIMITATIONS A. During winter, Unit Operator should be notified before starting an Aux Bldg Gen Supply Fan due to larger heat load demand.

B. Do NOT operate AB Gen Supply Fans when outside temp is 40°F or less, UNLESS the Aux Steam system is in operation to supply building heat to fan inlet coils to prevent coil freeze-up.

C. Aux Bldg (AB) Gen Exh Fan controllers 1-FCO-30-164 (Fan IA) or -168 (Fan I B), and 2-FCO-30-273 (Fan 2A) or -277 (Fan 2B), should automatically maintain -0.25 in. HO in Aux Bldg relative to atmosphere.

2 D. Fuel Handling Exhaust Fan controllers 0-FCO-30-169 (Fan A) and/or 0-FCO-30-1 70 (Fan B), should automatically maintain -0.25 in. H0 in 2

Aux Bldg relative to atmosphere.

E. Starting/stopping supply and/or exhaust fans (Aux Bldg or Fuel Handling) could result in Aux Bldg pressure NOT being maintained slightly negative, which could lead to unmonitored release paths. Negative pressure should be maintained in the Aux Bldg at all times (ABGTS may be used if required)[c2]

F. Starting/stopping of AB Gen Supply, Exhaust, and Fuel Handling Exhaust Fans causes large Aux Bldg press transients, which can cause personnel injury when entering and exiting Aux Bldg doors.

G. Changes in Aux Bldg HVAC may change radiological conditions in specific areas. Before changing HVAC line-ups or starting/stopping fans, notify Radiological Protection.

H. Prolonged operation of A and B fans on a single unit of AB Gen Supply, Exhaust, and Fuel Handling Exhaust Fans can cause duct work and damper damage due to excessive pressure.

I. Work in a Radiological Control Area (RCA) requires the use of existing RWPs, and may require additional ALARA Preplans. Failure to follow posted Rad control requirements can cause unnecessary radiation exposure. Radiation Protection should be notified of work having the potential to change radiological conditions.

J. Notify Instrument Maintenance to ensure required instruments are placed in service as necessary to support system operation.

073 K1.01 052 3Q ((-i7X jc7i-c-Given the following plant alarms:

- O-RA-90-125A, MAIN CNTRL RM INTAKE MON HIGH RAD

- O-RA-90-126A, MAIN CNTRL RM INTAKE MON HIGH RAD Which ONE of the following describes the Main Control Room ventilation alignment?

The MCR is maintained at a A. positive pressure by the Main Control Room Air Handling Units.

B. negative pressure by the Main Control Room Air Handling Units.

C a positive pressure by the Control Building Emergency Air Pressurization Fans.

D. a negative pressure by the Control Building Emergency Air Pressurization Fans.

3-OT-SYSO3 1 A Revision 7 Page 5of38 PROGRAM Watts Bar Operator Training II. COURSES A. License Training B. NOTP C. License Operator Requalification D. NAUO Requalification III. TITLE Control Building Heating and Ventilation IV. LENGTH OF LESSON A. Licensed Training 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months B. NOTP 3 hours3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months V. TRAINING OBJECTIVES AR S S U OR T 0 0 A X X X X 1. State the purpose of the control building ventilation system.

X X X X 2. State the purpose of the control building emergency ventilation system.

X X X X 3. Describe the ventilation flow path provided by the control building ventilation system during normal and emergency operation.

X X X X 4. List the signals which initiate a main control room isolation.

X X X X 5. List events that occur during a main control room isolation.

X X X X 6. Identify the location of the equipment required for a lineup of the control building ventilation system.

X X X X 7. Describe the steps required to lineup and start a main control room air handling unit.

3-OT-SYSO3 1 A Revision 7 Page 6of38 A R S S U 0 R T 0 0 A X X X X 8. Describe the common factor in the four instances of safety system inoperability described in SER 11 -92.

VI. TRAINING AIDS A. Whiteboard and markers.

B. Multimedia projector.

C. Overhead projector VII. MATERIALS One copy of each of the following for each participant as required:

Appendices None B. Attachments None VIII. REFERENCES N3-3OCB-4002 Control Building Heating, Ventilating, Air Conditioning and 15 Air Cleanup System 6.4 Habitability Systems 7 9.4.1 Control Room Area Ventilation System 7

WBN 10-2011 NRC RO Exam As Submitted 8/15/2011

53. 076 A4.01 053 Given the following conditions:

- Unit I is operating at 100% power.

- ERCW pump handswitch status:

- A-AisinP-T-L

- B-A is in A-AUTO and pump stopped.

- C-A is in A-AUTO and pump running.

- D-A is in A-AUTO and pump stopped.

- Emergency Power Selector Switches are positioned to B-A and C-A, respectively.

- A loss of offsite power occurs.

Which ONE of the following identifies...

(1) if a Tech Spec LCO 3.7.8 Essential Raw Cooling Water (ERCW) System, entry was required prior to the loss of offsite power and (2) how the indication on on 0-Pl-67-18A, A ERCW SUP HDR PRESS, will respond after the blackout sequence relays complete restoration of loads on the Shutdown Boards?

LCO entry required 0-Pl-67-18A A. YES Same as before loss of offsite power.

B. YES Higher than before loss of offsite power.

C. NO Same as before loss of offsite power.

D NO Higher than before loss of offsite power.

Page 139

WBN 10-2011 NRC RO Exam As Submitted 811512011 DISTRACTOR ANAL YSIS:

A. lncorrect, Plausible because the A-A pump is inoperable as aligned in the stem (but only one of the paired pumps is required) and the demand on the Train A system will be the same after the blackout sequence but an additional pump will be started to raise the pressure in the system.

B. Incorrect, Plausible because the A-A pump is inoperable as aligned in the stem (but only one of the paired pumps is required) and since an additional pump is started due to the blackout sequence, without an increase in system demand, the system pressure will be higher.

C. Incorrect, Plausible because no LCO entry being required prior to the blackout signal is correct and the demand on the Train A system will be the same after the blackout sequence. But an additional pump will be started to raise the pressure in the system.

D. Correct, the alignment met the LCO prior to the loss of offsite power, so no entry was required. The requirement is for that either the A-A pump or the B-A pump to be operable. The B-A pump, while not in service, will start on a blackout or a Safety injection signal. With the current alignment, after the blackout sequence was completed there would be 2 pumps running on Train A as opposed to only one pump prior to the blackout. Thus the pressure would be and indicate higher after the blackout sequence.

Question Number: 53 Tier: 2 Group 1 KIA: 076 A4.01 Service Water System (SWS)

Ability to manually operate and/or monitor in the control room:

SWS pumps Importance Rating: 2.9 / 2.9 10 CFR Part 55: 41.7 / 45.5 to 45.8 IOCFR55.43.b: Not applicable KIA Match: K/A is matched because the question requires the ability to identify how the ERCW pump parameters would be expected to change following restart during a blackout condition (monitoring) and the affect the event would have on the ERCW pressure (monitoring) after the board was restored.

Technical

Reference:

Tech Spec 3.7.8, Essential Raw Cooling Water Page 140

WBN 10=2011 NRC RO Exam As Submitted 8/15/2011 Technical

Reference:

Tech Spec 3.7.8, Essential Raw Cooling Water (ERCW), Amendment 69 and the associated Bases 1-47W611-67-1 Rh Proposed references None to be provided:

Learning Objective: 3OT-SYSO67A

13. Given a loss of power, determine the correct response of the ERCW System including:

b. ERCW Pumps.

24. Regarding Technical Specifications and Technical Requirements for this system:

c. Given a status set of plant conditions, apply the appropriate Technical Specifications and Technical Requirements.

Cognitive Level:

Higher X Lower Question Source:

New X Modified Bank Bank Question History: New question for the WBN 10/2011 NRC exam Comments:

Page 141

ERCW 3.7.8 3.7 PLANT SYSTEMS 3.7.8 Essential Raw Cooling Water (ERCW) System LCO 3.7.8 Two ERCW trains shall be OPERABLE.

APPLICABILITY: MODES 1,2, 3, and 4.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One ERCW train A.1 NOTES inoperable, other than for 1. Enter applicable Condition C. Conditions and Required Actions of LCO 3.8.1, AC Sources- Operating, for emergency diesel generator made inoperable by ERCW.

2. Enter applicable Conditions and Required Actions of LCO 3.4.6, RCS Loops-MODE 4, for residual heat removal loops made inoperable by ERCW.

Restore ERCW train to 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months OPERABLE status.

(continued)

Watts Bar-Unit 1 3.7-19 Amendment 69

ERCW 3.7.8 ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME B. Required Action and B.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months associated Completion Time of Condition A not AND met.

B.2 Be in MODE 5. 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months C. Two Train A ERCW pumps C.1 Align the operable pumps (C-A 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months (A-A and B-A) inoperable and D-A) to concurrently and two Train A ERCW autostart from the 2A-A 6.9 KV pumps operable (C-A and Shutdown Board.

D-A).

AND C.2 Restore at least one of the 10 days pumps (A-Aor B-A) to OPERABLE status.

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.7.8.1 NOTE Isolation of ERCW flow to individual components does not render the ERCW inoperable.

Verify each ERCW manual, power operated, and 31 days automatic valve in the flow path servicing safety related equipment, that is not locked, sealed, or otherwise secured in position, is in the correct position.

(continued)

This CONDITION will apply until the A-A or B-A pump is repaired and declared operable or until July 31, 2008, whichever occurs first.

Watts Bar-Unit 1 3.7-20 Amendment 69

ERCW 3.7.8 SURVEILLANCE REQUIREMENTS (continued>

. SURVEILLANCE FREQUENCY SR 3.7.8.2 Verify each ERCW automatic valve in the flow path 18 months that is not locked, sealed, or otherwise secured in position, actuates to the correct position on an actual or simulated actuation signal.

SR 3.7.8.3 Verify each ERCW pump starts automatically on an 18 months actual or simulated actuation signal.

Watts Bar-Unit 1 3.7-20a

ERCW B 31.8 B 3.7 PLANT SYSTEMS B 3.7.8 Essential Raw Cooling Water (ERCW) System BASES BACKGROUND The ERCW provides a heat sink for the removal of process and operating heat from safety related components during a Design Basis Accident (DBA) or transient. During normal operation, and a normal shutdown, the ERCW System also provides this function for various safety related and nonsafety related components. The safety related function is covered by this LCO.

The shared ERCW system consists of eight 50% ERCW pumps, four traveling water screens, four screen wash pumps, four strainers, associated piping, valves, and instrumentation.

Water for the ERCW system enters two separate sump areas of the pumping station through four traveling water screens, two for each sump. Four ERCW pumping units, all on the same plant train, take suction from one of the sumps, and four more on the opposite plant train take suction from the other sump. One set of pumps and associated equipment is designated Train A, and the other Train B. These trains are redundant and are normally maintained separate and independent of each other. Each set of four pumps discharges into a common manifold, from which two separate headers (1A and 2A for Train A, and 1 B and 2B for Train B) each with its own automatic backwashing strainer, supply water to the various system users. Two pumps per train are adequate to supply worst case conditions. Two pumps per train are aligned to receive power from different diesel generators. Operator designated pumps and valves are remote and manually aligned, except in the unlikely event of a loss-of-coolant accident (LOCA). The pumps are automatically started upon receipt of a safety injection (SI) signal, and some essential valves are aligned to their post-accident positions. Some manual realignments of motor-operated valves (MOVs) are necessary. The ERCW System also provides emergency makeup to the Component Cooling System (CCS) and is the backup water supply to the Auxiliary Feedwater System.

Additional information about the design and operation of the ERCW, along with a list of the components served, is presented in the FSAR, Section 9.2.1 (continued)

Watts Bar-Unit 1 B 3.7-43

ERCW B 3.7.8 BASES BACKGROUND (Ref. 1). The principal safety related function of the ERCW System is the (continued) removal of decay heat from the reactor via the CCS.

APPLICABLE The design basis of the ERCW System is for one ERCW train, in conjunction SAFETY ANALYSES with the CCS and a 100% capacity Containment Spray System and Residual Heat Removal (RHR), to remove core decay heat following a design basis LOCA as discussed in the FSAR, Section 9.2.1 (Ref. 1). This prevents the containment sump fluid from increasing in temperature during the recirculation phase following a LOCA and provides for a gradual reduction in the temperature of this fluid as it is supplied to the Reactor Coolant System by the ECCS pumps. The ERCW System is designed to perform its function with a single failure of any active component, assuming the loss of offsite power.

The ERCW System, in conjunction with the CCS, also cools the unit from RHR, as discussed in the FSAR, Section 5.5.7, (Ref. 2) entry conditions to MODE 5 during normal and post accident operations. The time required for this evolution is a function of the number of CCS and RHR System trains that are operating.

One ERCW train is sufficient to remove decay heat during subsequent operations in MODES 5 and 6. This assumes a maximum ERCW temperature of 85°F occurring simultaneously with maximum heat loads on the system.

The ERCW System satisfies Criterion 3 of the NRC Policy Statement.

LCO Two ERCW trains are required to be OPERABLE to provide the required redundancy to ensure that the system functions to remove post accident heat loads, assuming that the worst case single active failure occurs coincident with the loss of offsite power.

An ERCW train is considered OPERABLE during MODES 1, 2, 3, and 4 when:

(continued)

Watts Bar-Unit 1 B 3.7-44

ERCW B 3.7.8 BASES LCO a. Two pumps, aligned to separate shutdown boards, are OPERABLE; and (continued)

b. The associated piping, valves, heat exchanger, and instrumentation and controls required to perform the safety related function are OPERABLE.

APPLICABILITY In MODES 1, 2, 3, and 4, the ERCW System is a normally operating system that is required to support the OPERABILITY of the equipment serviced by the ERCW System and required to be OPERABLE in these MODES.

In MODES 5 and 6, the OPERABILITY requirements of the ERCW System are determined by the systems it supports.

ACTIONS A.1 If one ERCW train is inoperable, action must be taken to restore OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months . In this Condition, the remaining OPERABLE ERCW train is adequate to perform the heat removal function. However, the overall reliability is reduced because a single failure in the OPERABLE ERCW train could result in loss of ERCW System function. Required Action A.1 is modified by two Notes.

The first Note indicates that the applicable Conditions and Required Actions of LCO 3.8.1, AC Sources Operating, should be entered if an inoperable ERCW train results in an inoperable emergency diesel generator. The second Note indicates that the applicable Conditions and Required Actions of LCO 3.4.6, RCS Loops MODE 4, should be entered if an inoperable ERCW train results in an inoperable decay heat removal train. This is an exception to LCO 3.0.6 and ensures the proper actions are taken for these components. The 72 hour8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months Completion Time is based on the redundant capabilities afforded by the OPERABLE train, and the low probability of a DBA occurring during this time period.

B.1 and B.2 If the ERCW train cannot be restored to OPERABLE status within the associated Completion Time, the plant must be placed in a MODE in which the LCO does not apply. To achieve this status, the plant must be placed in at least (continued)

Watts Bar-Unit 1 B 3.7-45

ERCW B 3.7.8 BASES ACTIONS B.1 and B.2 (continued)

MODE 3 within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in MODE 5 within 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months . The allowed Completion Times are reasonable, based on operating experience, to reach the required plant conditions from full power conditions in an orderly manner and without challenging plant systems.

SURVEILLANCE SR 3.7.8.1 REQUIREMENTS This SR is modified by a Note indicating that the isolation of the ERCW System components or systems may render those components inoperable, but does not affect the OPERABILITY of the ERCW System.

Verifying the correct alignment for manual, power operated, and automatic valves in the ERCW System flow path provides assurance that the proper flow paths exist for ERCW System operation. This SR does not apply to valves that are locked, sealed, or otherwise secured in position, since they are verified to be in the correct position prior to being locked, sealed, or secured. This SR does not require any testing or valve manipulation; rather, it involves verification that those valves capable of being mispositioned are in the correct position. This SR does not apply to valves that cannot be inadvertently misaligned, such as check valves.

The 31 day Frequency is based on engineering judgment, is consistent with the procedural controls governing valve operation, and ensures correct valve positions.

SR 3.7.8.2 This SR verifies proper automatic operation of the ERCW System valves on an actual or simulated actuation signal. The ERCW System is a normally operating system that cannot be fully actuated as part of normal testing. This Surveillance is not required for valves that are locked, sealed, or otherwise secured in the required position under administrative control. The 18 month Frequency is based on the need to perform this Surveillance under the conditions that apply (continued)

Watts Bar-Unit 1 B 3.7-46

ERCW B 3.7.8 BASES SURVEILLANCE SR 3.7.8.2 (continued)

REQUIREMENTS during a unit outage and the potential for an unplanned transient if the Surveillance were performed with the reactor at power. Operating experience has shown that these components usually pass the Surveillance when performed at the 18 month Frequency. Therefore, the Frequency is acceptable from a reliability standpoint.

SR 3.7.8.3 This SR verifies proper automatic operation of the ERCW pumps on an actual or simulated actuation signal. The ERCW System is a normally operating system that cannot be fully actuated as part of normal testing during normal operation.

The 18 month Frequency is based on the need to perform this Surveillance under the conditions that apply during a unit outage and the potential for an unplanned transient if the Surveillance were performed with the reactor at power.

Operating experience has shown that these components usually pass the Surveillance when performed at the 18 month Frequency. Therefore, the Frequency is acceptable from a reliability standpoint.

REFERENCES 1. Watts Bar FSAR, Section 9.2.1, Essential Raw Cooling Water.

2. Watts Bar FSAR, Section 5.5.7, Residual Heat Removal System.

Watts Bar-Unit 1 B 3.7-47

3-OT-SYSO67A Revision 12 Page 5 of 41 I. PROGRAM Waifs Bar Operator Training II. COURSES A. License Training B. Non-License Training III. TITLE Essential Raw Cooling Water System IV. LENGTH OF LESSON A. Licensed Training 2 hour2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months B. Non-Licensed Training 3.5 hours5.787037e-5 days 0.00139 hours 8.267196e-6 weeks 1.9025e-6 months V. TRAINING OBJECTIVES 0

D 1-Cl)

X X X 1. State the function of the Essential Raw Cooling Water System in accordance with the system description.

X X X 2. State the design basis of the Essential Raw Cooling Water System in accordance with FSAR Section 9.2.1.

X X X X 3. Describe the ERCW System flow path from the river to the cooling tower basin and discharge holding pond including:

a. Interfaces

b. Major components

c. Paths to and from the Auxiliary Building X X X X 4. Deleted.

X X X X 5. Deleted.

X X 6. Explain the purpose of Biocide injection.

X X 7. Discuss the precaution associated with contact of Bromide with the j body X 8. State the ERCW System normal discharge path and given a failure X

J X of the path, discuss the alternate discharge paths.

Describe the purpose of the hydraulic gradient.

- A 9.

X X X X 10. Describe the purpose of the discharge overflow structure.

X X IX X 11. Deleted.

3-OT-SYSO67A Revision 12 Page 6 of 41 0 0 D 0 a:

a: C,) Cl)

X X X X 12. Deleted.

X X X 13. Given a loss of power, determine the correct response of the ERCW System including:

a. C CCS Heat Exchanger outlet valves.

b. ERCW Pumps.

X X X X 14. Explain how and when the ERCW System would be used to feed the Steam Generators.

X X X X 15. List the places where the ERCW System can be interconnected to another system with a spool piece.

X X X X 16. Given a failure in the ERCW System, determine how radiation would be detected.

X X X 17. Given a loss of instrument air/control power, determine the effect on temperature control valves.

X X X X 18. [Identify 2 indications of biofouling in heat exchangers as stated in SOER 84-1. (REC. #4)]

X X X X 19. Describe the ERCW pumps including capacity, logic, power supplies, type, lubrication, heat removal means and alarm setpoints.

X X X X 20. Describe the normal and backwash flow paths of the ERCW strainers.

X X X X 21. Describe the purpose of the ERCW prelube, what components it supplies and from where it is supplied.

X X X X 22. Describe the operation of the traveling screen system, normal and backwash, and how P is determined.

X X X X 23. Briefly describe how to place the ERCW System in service per SQl-67.01.

X X X 24. Regarding Technical Specifications and Technical Requirements for this system:

a. Identify the conditions and required actions with completion time of one hour or less.

b. Explain the Limiting Conditions for Operation, Applicability, and Bases.

c. Given a status/set of plant conditions, apply the appropriate Technical Specifications and Technical Requirements.

X X X X 25. List the ERCW parameters governed by Tech Specs.

3-OT-SYSO67A Revision 12 Page 7 of 41 0 0<

DO a:

< a: Cl) Cl)

X X X X 26. Correctly locate control room controls and indications associated with the Essential Raw Cooling Water System, including:

a. Pump and Selector Switch Controls

b. Header Isolation Valves and Flow Indications

c. Supply and Discharge Headers

d. CCS Heat Exchanger Alignments X X X X 27. [Identify the action(s) to be taken by the operator if significant heat exchanger degradation due to fouling is detected.

(SOER 84-1, Rec. 4)]

3-OT-SYSO67A Revision 12 Page 22 of 41

4. Discuss the switchgear mounted controls associated with ERCW pumps.

LU I Three position START/STOP/A AUTO control

-J switch.

U)

START With switchgear selector switch in Auxiliary and no emergency signals, pump will start.

STOP With switchgear selector switch in Auxiliary pump will stop.

A-AUTO With the switchgear selector switch in Auxiliary, pump selected, and the following, the pump will auto start:

SI signal

Blackout with voltage available after a 20 second delay.

5. Discuss the function and operation of the ERCW EROW Pump Selector Switch Pump Diesel Generator Power Selector Switch.

Lii

There are eight ERCW pumps and four 6.9 KV shutdown boards.

M-27A

Two pumps receive power from each shutdown board.

To ensure diesel generator loading is not exceeded, only one pump will start on each diesel generator.

Selector switch for each pump pair selects the pump that will receive an auto-start signal during an emergency.

WBN 10-2011 NRC RO Exam As Submitted 811512011

54. 078 K2.02 054 Given the following:

- Unit I is in Mode 3 following a reactor trip when a loss of off-site power occurs.

- All Diesel Generators start and restore the shutdown boards.

Which ONE of the following identifies...

(1) how the Control and Station Air Compressor A will respond as the control air pressure is dropping and (2) the 480V Shutdown Board that supplies power supply to the compressor?

A. (1) Compressor will start and load as needed automatically; (2) 480V SD Bd 1A2-A B. (1) Compressor will start and load as needed automatically; (2) 480V SD Bd 2A2-A Cv (1) Compressor must be manually started but will load as needed automatically; (2) 480V SD Bd 1A2-A D. (1) Compressor must be manually started but will load as needed automatically; (2) 480V SD Bd 2A2-A Page 142

WBN 10-2011 NRC RO Exam As Submitted 8/15/2011 DISTRACTOR ANAL YSIS:

A. Incorrect, Plausible because the compressor will load/unload as needed automatically after it is manually started and the power supply being from a Unit I 480V board is correct.

B. Incorrect, Plausible because the compressor will load/unload as needed automatically after it is manually started and the Auxiliary Air Compressor A-A is supplied from a Unit 2 480V board.

C. Correct, The Control and Service Air Compressor A is one of the two compressors that can be restarted following a Blackout but it must be started manually and the compressor is supplied from the 480V Shutdown Board IA-2A.

D. Incorrect, Plausible because the compressor start being manual is correct and the Auxiliary Air Compressor A-A is supplied from a Unit 2 480V board.

Question Number: 54 Tier: 2 Group 1 K/A: 078 K2.02 Instrument Air System Knowledge of bus power supplies to the following:

Emergency air compressor Importance Rating: 33* / 3*5*

10 CFR Part 55: 41.7 IOCFR55.43.b: Not applicable KIA Match: K/A is matched because the question requires the applicant to have knowledge of the bus power supplies to the auxiliary(emergency) air compressors.

Technical

Reference:

SOI-32.01, Control Air System, Revision 0051 AOl-i 0, Loss of Control Air, Revision 0040 AC 1-35, Loss of Offsite Power, Revision 0038 Proposed references None to be provided:

Learning Objective: 3-OT-SYSO32A

9. Explain how the sequencing device operates to control the control air compressors in Hand and Page 143

WBN 10-2011 NRC RO Exam As Submitted 811512011 Learning Objective: 3-OT-SYSO32A

9. Explain how the sequencing device operates to control the control air compressors in Hand and Auto.

3-OT-AO 13500

2. Given a list of symptoms, Identify Event, determine Automatic Actions and Operator Actions required per AOl-35.

Cognitive Level:

Higher X Lower Question Source:

New Modified Bank Bank X Question History: WBN bank question 078 K2.02 054 Comments:

Page 144

WBN Loss of Offsite Power AOI-35 Unit I Rev. 0038 Step Action/Expected Response Response Not Obtained 3.3 Loss of BOTH 161kV Power Supplies (continued)

15. CHECK cooling water available to PERFORM controlled shutdown USING Secondary Systems (RCW pumps GO-4 Normal Power Operation, running). GO-5, Unit Shutdown From 30%

Reactor Power To Hot Standby, and GO-6, Unit Shutdown From Hot Standby To Cold Shutdown, as applicable.

16. DISPATCH personnel to the following locations to inspect for equipment abnormalities:

Relay room.

6.9kV CSST switchgear housing.

Start bus switchgear housing.

17. CHECK control air NORMAL: REFER TO AOl-i 0, Loss of Control Air.

Required compressors running

[T4M/708].

Pressure between 90 and 105 psig [T4M/708].

18. CHECK aux air header pressure REFER TO AOl-b, Loss of Control Air.

greater than 75 psig [1-M-15].

19. DISPATCH AUO to DG bldg to monitor DG operating parameters USING SOI-82 Series.

NOTE Attachment 3 provides reference to applicable Tech Specs as well as recovery actions for loss of both 161 kV lines.

20. REFER TO Attachment 3 for consideration for recovery from loss of both 161kV lines.

Page 10 of 42

WBN Loss of Control Air AOl-b Unit I Rev. 0040 Attachment I (Page 1 of 5)

Local Restart of C&SS Air Compressors Step Action/Expected Response Response Not Obtained NOTE I Continuous contact between UO and NAUO should be maintained to aid quick recovery of air compressors.

NOTE 2 Attachment 1 is posted on panel O-L-240 near the station air compressors. The posting must be revised if this Attachment is revised. Changes in revision level or page number will NOT require re-posting, as long as the content does NOT change CHECK C&SS AIR COMPR SELECT ALT control power using SEQUENCER UNDERVOLTAGE 125V DC Manual Transfer Switch

[42-El, DARK. O-XS-32-5049 [O-L-240].

2. Locally CHECK O-PCV-33-4, CLOSE O-PCV-33-4 using O-HS-33-4.

SERVICE AIR SUPPLY ISOLATION, CLOSED [T7M/708].

3. CHECK local station alarm DARK IF local station alarm LIT,

[O-L-240, T7M1708]. THEN PERFORM the following for each compressor in alarm:

a. RESET high air temp at each compressor (O-TS-32-41, -36, -31).

b. RESET high oil temp at each air compressor (O-TS-32-40, -35, -30).

c. RESET common alarm using 0-HS-32-25B, COMPRESSOR A, B, and C RESET [0-L-240, yellow PB].

d. CHECK common and all local alarms, DARK.

Page 38 of 44

WBN Loss of Control Air AOl-b

Unit I Rev. 0040 Attachment I (Page 2 of 5)

Local Restart of C&SS Air Compressors Step Action/Expected Response Response Not Obtained

4. PLACE the following C&SS Compressors to HAND [O-L-2401:

A, O-HS-32-25D.

B, O-HS-32-26A.

5. PLACE O-HS-32-25A, STATION AIR COMPRESSOR SEQUENCE CONTROL, to Posilion 1.

6. START Compressor A by pushing O-HS-32-25E.

7. CHECK Compressor A loads IF Compressor A does NOT Auto load, automatically. THEN PLACE O-HS-32-43A and -43B to ON (Local O-JB-291-226).

IF Compressor A does NOT load from local panel, THEN:

a. CLOSE O-ISV-32-578, STATION AIR COMPR A UNLOADING HDR ISOL.

b. VENT O-TV-32-579, STATION AIR COMPR A UNLOADING HDR TEST.

8. START Compressor B by pushing, O-HS-32-26B.

Page 39 of 44

WBN Loss of Control Air AOl-b Unit I Rev. 0040 Attachment I (Page 3of5)

Local Restart of C&SS Air Compressors Step Action/Expected Response Response Not Obtained

9. CHECK Compressor B loads IF Compressor B does NOT Auto load, automatically. THEN PLACE 0-HS-32-38A and -38B to ON (Local 0-JB-291-226).

IF Compressor B does NOT load from local panel, THEN:

a. CLOSE 0-ISV-32-581, STATION AIR COMPR B UNLOADING HDR ISOL.

b. VENT 0-TV-32-582, STATION AIR COMPR B UNLOADING HDR TEST.

10. MONITOR Compressor operation:

Oil press 25-30 psig on A, B, and C.

Cooling water flow.

Compressors auto-loading.

LOAD and UNLOAD compressors manually to maintain greater than 83 psig using RNO for Steps 7 & 9.

Page 40 of 44

WBN Loss of Control Air AOl-I 0 Unit I Rev. 0040 Attachment I (Page 4 of 5)

Local Restart of C&SS Air Compressors Step Action/Expected Response Response Not Obtained NOTE If 480V Aux Bldg Common Bd is energized, Compressors C should be running and loaded by the load sequencer relay. If the compressors have to be restarted, the SAFESTOP/RESET button for each compressor may have to be placed in SAFESTOP, then back to RESET to allow restart.

11. CHECK 480V Aux Bldg Common Bd **

GO TO Step 14.

ENERGIZED.

12. CHECK local control station alarm IF any local alarm LIT, DARK [0-L-240, T7M/708]. THEN PERFORM the following for each compressor in alarm:

a. RESET high air temp at each compressor (0-TS-32-41, -36, -31).

b. RESET high oil temp at each compressor (0-TS-32-40, -35, -30).

c. RESET common alarm using 0-HS-32-25B, COMPRESSOR A, B, and C RESET [yellow PB].

d. CHECK common and all local alarms, DARK.

13. PLACE C C&SS Compressor to AUTO USING 0-HS-32-27A.

14. CHECK air press returning to between 95 and 100 psig.

Page 41 of44

WBN Loss of Control Air AOl-10

Unit I Rev. 0040 Attachment I (Page 5of5)

Local Restart of C&SS Air Compressors Step Action/Expected Response [sponse Not Obtained

15. IF compressor A or B being operated in manual mode, THEN MONITOR compressor operation and system press until compressors can be returned to auto mode.

16. RETURN TO Instruction in effect.

Page 42 of 44

WBN Control Air System SOI-32.01 Unit I Rev. 0051 Page 23 of 63 6.0 NORMAL OPERATION 6.1 Normal Operating Parameters and General Information The Control Air System during normal plant operation, supplies compressed air for all Control and Service Air System requirements. It also supplies air to the Auxiliary Air System while the AAS compressors are in standby. Aux Air Compressors auto start when Control Air System header press falls to 83 psig lowering. Control Air System auto isolates to Service Air at 80 psig lowering. Aux air isolates from Control Air System at 79.5 psig lowering. Compressor D will be the normal lead compressor. Compressors A, B, and C will normally be placed in Standby/AUTO and operates according to sequencer setting.

Compressor D has several protective trip(s) as follows:

D Compressor Trips:

1. LowOilTemp8O°F

2. High Oil Temp 135°F

3. High Air Temp Stage 1, 125°F

4. DischAirTemp 125°F

5. High Pinion Shaft Vibration 1st Stage, 1.0 mil

6. High Pinion Shaft Vibration 2nd Stage, .96 mil

7. Low Water Flow

8. Low Seal Air Press 6 psig (also an interlock)

9. Low Oil Press 16 psig A Low seal air interlock of 6 psig for Air Compressor D prevents prelube pump from operating and thus prevents Compressor start. Compressor Ds prelube pump runs when local panel is energized. After Compressor D starts, prelube pump will auto stop and a time delay gives the shaft driven oil pump time to provide a normal oil press of 26 psig. The prelube pump auto starts on Compressor D shutdown and will continue to run until panel deenergized. Upon Compressor D shutdown allow prelube pump to run a minimum of 30 minutes to allow compressor bearings to cooldown. Oil press on running Compressors A, B, and C, should be approx 30 psig, and Oil level at the normal mark on the indicator.

WBN Control Air System SOI-32.01 Unit I Rev. 0051 Page 24 of 63 6.1 Normal Operating Parameters and General Information (continued)

Cooling water discharge temp from running Compressor A, B, and C water jacket should be less than 135°F (Nominal 120°F) and intercooler discharge temp should be less than 110°F (Nominal 90°F). TCV bypass may be OPENED up to 1/4 turn to maintain temp. If more water flow is needed, a WO should be issued for TCV.

Control Air Receiver normal press is approx 95-1 00 psig. Press entering Air Dryers should be 90 psig[c.i]. A? across each Air Dryer Station prefilter should be 5 psid[c.11, if NOT, filter should be cleaned[c.1]. Air flow on Air Dryer Station rotameter during purge normally indicates 55%. One Air Dryer Station is sufficient for one unit operation, although 3 dryers in-service is normal.

Applicable Checklists will be performed at discretion of Operations Superintendent or designee. Checklists will normally be performed for System Alignment Verification in Mode 5 or whenever alignment Verification is needed.

SEE tables below for Compressors A, B, and C loading and unloading sequence.

RISING PRESSURE COMPRESSOR FULL LOAD HALF LOAD UNLOADS LEAD 91 psig 96 psig 99 psig SECOND 85 psig 90 psig 93 psig THIRD 79 psig 84 psig 87 psig DROPPING PRESSURE COMPRESSOR HALF LOADED FULL LOADED LEAD 94 psig 91 psig SECOND 88 psig 85 psig THIRD 82 psig 79 psig

3-OT-SYSO32A Revision 9 Page 4of45 I. PROGRAM Watts Bar Operator Training II. COURSES License Training NOTP License Requalification NAUO Requalification III. TITLE Control Air System IV. LENGTH OF LESSON A. License Training 3 Hours B. NOTP 3 Hours License Requalification and NAUO Requalification times will be determined after objectives are identified.

V. TRAINING OBJECTIVES A S U R 0 0 X X 1. State the function of the Control Air system in accordance with the system description.

X 2. State the design basis of the Control Air system in accordance with FSAR section 9.3.

X X 3. Sketch a simple diagram of the control air system from the compressors through the dryers.

X X 4. Describe the station air compressors; include cooling methods, lubrication, capacities, power supplies, stages, and operation.

X X 5. Discuss the purpose of the intercooler and list the cooling medium and the pressure at which the intercooler safety valve is set to relieve.

X X 6. Given a high intercooler pressure condition on Air Compressor A, B or C, explain how to troubleshoot the control air compressor.

3-OT-SYSO32A Revision 9 Pagesof45 A RSS U ORT 0 CA X X X X 7. Discuss the purpose of the aftercooler and list the cooling medium.

X X X X 8. Describe how the moisture traps work, and why is it important to check and drain the intercooler moisture trap during each shift.

X X X X 9. Explain how the sequencing device operates to control the control air compressors in Hand and Auto.

X X X X 10. Explain how the control air compressors are affected by a loss of power to the sequencer.

X X X 1 1. Explain how the control air compressors may be loaded manually.

X X X X 12. List all trips associated with the control air compressors.

X X X X 13. List the steps necessary to restore a compressor to operation after a trip.

X X X X 14. State the purpose of the control air receivers and pulsation dampener.

X X X X 15. Describe the control air dryers, include modes, drying medium, alarms, indications and flow paths.

X X X X 16. List the events and their corresponding set points that take place on decreasing control air pressure.

X X X 17. Given a loss of non-essential air, explain why a reactor trip will occur.

X X X X 18. Describe the most common problem in instrument air systems. SOER 88-1 Rec. 3 (COMMITMENT)

X X X 19. Describe the major problems facing operators in a loss of instrument air events. SOER 88-1 Rec. 3 (COMMITMENT)

X X X 20. Correctly locate control room common alarms associated with the Control Air system, including:

a. Low Lube Oil Pressure

b. High Discharge Air Temp

c. High Oil Temp

3-OT-SYSO32A Revision 9 Page 6 of 45 A RSS U ORT C CA X X X X 21. Describe the operation of the Centrifugal Air Compressor.

X X X X 22. Describe the two methods used by the Centrifugal Air Compressor to control system pressure.

3-OT-AO13500 Rev 9 I. PROGRAM Page 4 of 63 WATTS BAR OPERATOR TRAINING II. COURSE A. NRC LICENSE PREP B. CERTIFICATION C. ONSITE D. NOTP E. LICENSED REQUAL F. AUO REQUAL III. TITLE AC 1-35, Loss of Offsite Power IV. LENGTH OF LESSON

-1 .5 hours5.787037e-5 days 0.00139 hours 8.267196e-6 weeks 1.9025e-6 months V. TRAINING OBJECTIVES AR S S U OR T 0 0 A X X 1 Describe the Purpose of AOI-35 X X 2. Given a list of symptoms, Identify Event, determine Automatic Actions and Operator Actions required per AOI-35.

X X X 3. Given one 161 kVWBN Hydro line has deenergized, determine the Automatic Actions that occur.

4. Deleted X X X X 5. Given conditions, determine if Technical Specifications LCO entry is required, what Actions (s) must be taken, and the Bases for the action(s).

6. Deleted 7 Deleted X X X X 8 Given a set of plant conditions, use AOI-35 to correctly diagnose and implement Action Steps, RNOs, Notes and Cautions X X X X 9 Describe the Blackstart procedure and explain when it is used.

WBN 10-2011 NRC RO Exam As Submitted 8/15/2011

55. io3i.oo Which ONE of the following identifies ventilation systems that exhaust out a Shield Building Exhaust Vent?

A. EGTS Cleanup Fans and Annulus Vacuum Control Fans B EGTS Cleanup Fans and Containment Purge Exhaust Fans C. Fuel Handling Exhaust Fans and Annulus Vacuum Control Fans D. Fuel Handling Exhaust Fans and Containment Purge Exhaust Fans DIS TRACTOR ANAL YSIS:

A. Incorrect, EGTS Fans can exhaust out the Shield Building Exhaust Vents but Annulus Vacuum Control Fans exhaust out the Auxiliary Building Vent. Plausible because the EGTS Fans exhausting out the Shield Building Exhaust Vents is correct and the annulus vacuum fans perform the same function of maintaining differential pressure between the containment and the annulus, only they run during normal operation and are isolated when the EGTS cleanup fans start.

B. Correct, the EGTS Fans and Containment Purge Exhaust Fans can exhaust out the Shield Building Exhaust Vents. The Containment Purge Exhaust Fans only exhaust through the Shield Building Exhaust Vent for the applicable unit. The EGTS Fans discharge to a Shield Building Exhaust Vent or recirculation back to the containment annulus depending on differential pressure.

C. lncorrect, Both the Fuel Handling Exhaust Fans and Annulus Vacuum Control Fans exhaust out the Auxiliary Building Vent. Plausible because the Fuel Handling Exhaust Fans are moving air that has the potential to have radioactivity and the annulus vacuum fans perform the same function of maintaining differential pressure between the containment and the annulus, only they run during normal operation and are isolated when the EGTS cleanup fans start.

D. Incorrect, Fuel Handling Exhaust Fans exhaust out the Auxiliary Building Vent (not the shield building vent) but Containment Purge Exhaust Fans do exhaust out the Shield Building Exhaust Vents. Plausible because the Fuel Handling Exhaust Fans are moving air that has the potential to have radioactivity and the Containment Purge Exhaust Fans exhausting out the Shield Building Exhaust Vents is correct.

Question Number: 55 Tier: 2 Group 1 KIA: 103 K1.03 Containment System Page 145

WBN 10-2011 NRC RO Exam As Submitted 811512011 KIA: 103 K1.03 Containment System Knowledge of the physical connections and/or cause effect relationships between the containment system and the following systems:

Shield building vent system Importance Rating: 3.1* / 35*

10 CFR Part 55: 41.2 to 41.9 / 45.7 to 45.8 IOCFR55.43.b: Not applicable KIA Match: K/A is matched because the question requires knowledge of the which stacks provide the flow release path for various ventilation systems including the identification of containment ventilation systems that exhaust out the shield building vent Technical

Reference:

1-47W866-1 R59 1-47W866-10 R33 1 -47W866-1 1 R27 Proposed references None to be provided:

Learning Objective: 3-OT-SYSO65A

4. Describe the Annulus Vacuum System Flowpath per 1 -47W866-1.

5. Describe how the EGTS and Annulus Vacuum Systems maintain annulus pressure.

Cognitive Level:

Higher Lower X Question Source:

New Modified Bank Bank X Question History: SQN bank question 103 K1.03 055 used on the SQN 1/2009 RETAKE exam.

Comments: SQN question written new for the retake exam Page 146

3-OT-SYSO65A Revision 12 Page 5of30 I. PROGRAM Watts Bar Operator Training II. COURSES A. License Training B. Non-License Training III. TITLE Emergency Gas Treatment System (EGTS)

IV. LENGTH OF LESSON A. Licensed Training 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months B. Non-Licensed Training 3 hours3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months V. TRAINING OBJECTIVES 0 0 D 0 (I)

X X X 1. State the Design Basis of the EGTS per FSAR 6.2 and 6.5.

X X X X 2. State the Function of the EGTS subsystems per the system description.

X X X X 3. List the AP maintained by Annulus Vacuum Fans; EGTS Fans.

X X X X 4. Describe the Annulus Vacuum System Flowpath per I -47W866-1.

X X 5 Describe how the EGTS and Annulus Vacuum Systems maintain annulus pressure X X X 6 Given a loss of instrument air/control power, determine the effect on the EGTS subsystems.

XXX7. Correctly locate EGTS subsystems MCR controls & indications including:

a. Annulus Vacuum Fans and Dampers.

b. EGTS Fans and Dampers.

c. CTMT Annulus AP indicators.

x Describe the EGTS filter bank, include purpose of Moisture Separator (Demister), Humidity Heater, Prefilter, HEPA filter, and Charcoal absorbers.

Describe the EGTS fans power supplies.

3-OT-SYSO65A Revision 12 Page6of3o 0 0<

D0QF-

<QØLl)

X X X 10. Describe the Auto starts for the EGTS Cleanup Fans:

a. In A-Auto

b. In P-Auto X X X X 11. Explain how decay heat is removed from a used, out-of-service EGTS filter bank X X X X 12. Describe why an in-service EGTS filter bank would heat up.

X X X X 13. Explain how the Air Cleanup subsystem maintains Annulus pressure.

X X X 14. State how Radiation is monitored on the EGTS.

X X X X 15. Discuss Precautions for the EGTS Annulus Vacuum Subsystem listed in S0l-65.01.

X X X 16. Discuss an auto start failure of the EGTS Air Cleanup System using SOl-65.02.

X X X X 17. Discuss Precautions for the EGTS Air Cleanup System listed in SQl-65.02.

X X X 18. Regarding Technical Specifications and Technical Requirements for this system:

a. Explain the Limiting Conditions for Operation, Applicability, and Bases.

b. Given a status/set of plant conditions, apply the appropriate Technical Specifications.

X X X X 19. Describe the in-plant location of the following:

a. Annulus Vacuum Fans.

b. Annulus Vacuum Fans Damper Reset Switches.

c. EGTS Air Cleanup Fans.

d. EGTS Air Cleanup System AP Control Logic Reset Switches.

e. MCR Indicators and Switches for EGTS.

3-OT-SYSO65A Revision 12 Page 13of30 2 DETAILED DESCRIPTION Annulus Vacuum Subsystem B- This subsystem has two independently uontroliod B-branches.

The two branches draw air frow their assigned annulus

1. Describe the general arrangement of the Annulus and release it to the Auxiliary Building Fuel Needling Area exhaust duct system.

Vacuum Subsystem.

B- Note that the Unit 2 AVCS is isolated by blank-off plates located in coremon portions of the ductwork a This subsystem has two independently controlled LU branches.

a The two branches draw air from their assigned

-J U) annulus and release it to the Auxiliary Building Fuel Handling Area exhaust duct system.

a Note that the Unit 2 AVCS is isolated by blank-off plates located in common portions of the ductwork.

2. Provide an overview of the Annulus Vacuum Subsystem major components.

a isolation Dampers.

In a Modulating Dampers.

a Vacuum Fans.

Ui Each of the major components will be discussed in

-J detail on subsequent slides.

Cl)

3. Describe the function and operation of the Annulus The air inlet for each I respective secondary containment volume above the Vacuum Subsystem.

steel uontainnneet down.

The Unit 2 annulus vacuum control subsystem is a The air inlet for each branch is centrally located in its isolated by means of blank-off plaIns located in tfre common portions of dootwork. respective secondary containment volume above the steel containment dome.

a The Unit 2 annulus vacuum control subsystem is isolated by means of blank-off plates located in the common portions of ductwork.

Ui

-J Cl)

3-OT-SYSO65A Revision 12 Page 26 of 30 m The Shield Building Stack discharge dampers are 5 The Shield Building Stack discharge dumpers are mechanically interlocked with the annulas discharge mechanically interlocked with the annulus discharge dampers. dampers.

Pthth

As one damper opens the other closes.

I For additional information refer to:

UI 47W866-1

-J 47W61 1-65-3 Cl) 47W61 0-65-1 I Also refer to 3-OT-STG-065A MFlowControl Modules

As AP decreases (annulus pressure rises), the 5- As tP decreases (annulus pressure rises), the echaust damper modulates opec and the anaulus modulates exhaust damper modulates open and the annulus 5.

closed.

This prooides the capability to adjust the amount of air modulates closed.

returned to tIre annulus. with the remainder echaustieg to the Shield Bldg. Stack. I This provides the capability to adjust the amount of air 1() returned to the annulus, with the remainder exhausting UI to the Shield Bldg. Stack.

-J C) 0mm 1VA Flow Control Modules 3. Discuss the MCR controls and indications associated i c5ce5.c,rr MCR Controls with the Flow Control Modules 5-

Three position (CLOSE IA AUTO /OPEN) control switch.

.. I CLOSE Manually closes damper.

ID

A AUTO:

Dampers 1-PCO-65-80 & 1-PCO-65-88 or 1-5-

0 5-PCO-65-82 & 1-PCO-65-89 will modulate to maintain the annulus pressure relative to the outside environment.

OPEN Manually opens dampers 1-PCV U,

U, 83/87 (1 -PCV-65-8 1/86).

UI

-J C,)

WBN 10-2011 NRC RO Exam As Submitted 8115/2011

56. 001 1(2.01 056 Given the following plant conditions:

- 480v Emergency Common Transformer is out of service.

Which ONE of the following describes the effect on the Control Rod Drive MG Sets if 6900v Unit Board 1 C is de-energized by relay operation?

A. Both MG sets lose power to the motor.

B Neither MG set loses power to the motor.

C. Only 11 A MG set loses power to the motor.

D. Only B MG set loses power to the motor.

DISTRACTOR ANAL YSIS:

A. Incorrect, Plausible if the applicant does not recall how the loss of the Unit Board power supplies affects the operation of the MG sets or misapplies the interaction between MG set motor breaker tripping due to board undervoltage resulting in the MG set generator breaker tripping and concludes the both M-G sets would be tripped.

B. Correct, Plausible because while the 480v Unit Boards that supply the MG sets are powered from the Unit 1 6.9 kV Unit Boards, neither is supplied from the 6.9kV Boards IC. The 480v Unit Boards supplying the M-G sets 1A and lB are supplied from the 6.9kv Unit Boards IA and ID, respectively.

C. Incorrect, Plausible because M-G Set IA would lose power if the 6.9kV Board IA were to trip.

D. Incorrect, Plausible because M-G Set lB would lose power if the 6.9kV Board ID were to trip.

Page 147

WBN 10-2011 NRC RO Exam As Submitted 811512011 Question Number: 56 Tier: 2 Group: 2 K/A: 001 K2.01 Control Rod Drive System Knowledge of bus power supplies to the following:

One line diagram of power supply to the M/G sets.

Importance Rating: 3.5 I 3.6 10 CFR Part 55: 41.7 IOCFR55.43.b: Not applicable KIA Match: KJA is matched because the question requires knowledge of the one line diagram of the power supply to the M/G Sets from the 6.9kv Unit Board to the 480v MG set motors.

Technical

Reference:

1-1 5E500-1 ,R35 SOl-85.01 ATT 1 P, Control Rod Drive and Indication System Power Checklist 85.01 P, Revision 0040 Proposed references None to be provided:

Learning Objective: 3-OT-SYSO85A

2. Identify the power supply to the MG Sets.

Cognitive Level:

Higher Lower X Question Source:

New Modified Bank X Bank Question History: SQN bank question used on the SQN 1/2008 Audit exam with stem changed to make a different answer correct Comments:

Page 148

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1. Given the following:

- UnitatlOO%RTP

- 480v Emergency Common Transformer Out of Service Which ONE of the describes the effect on the Control Rod Drive MG Sets if 6900v Unit Board I D is de-energized by relay operation?

A. Both MG sets lose power to the motor.

B. Neither MG set loses power to the motor.

C. Only A MG set loses power to the motor.

D Only B MG set loses power to the motor.

-cIvIsu[I t Page 5of58 I. PROGRAM Watts Bar Operator Training II. COURSES A. License Training B. Non-License Training III. TITLE Rod Control and Motor Generator Sets IV. LENGTH OF LESSON A. Licensed Training 6 hour6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months B. Non-Licensed Training 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months V. TRAINING OBJECTIVES NOTE Octives will be identified in the text as Objective RC1 etc.

A R S S U 0 R T 0 0 A X X X X 1. State the design basis (purpose) of the control rod drive system.

X X X X 2. State the number of RCCAs and their compositions.

X X X X 3. Identify the number of banks, groups per bank, and rods per group for the shutdown control rods.

X X X X 4. Describe the sequence of shutdown bank withdrawal or insertion including mode of control and speed.

X X X X 5. Identify the number of banks, groups per bank, and rods per group for the control banks.

X X X X 6. Describe how the rod drive mechanism moves rods on withdrawal, rest, or insertion.

X X X X 7. Describe the effects of normal control rod motion on RCS Tavg.

X X X X 8. Describe the controls for the control rods, including mode selector switch, speeds, and bank overlap.

X X X 9. Sketch the control rod drive control logic from the input signals to the cyclers.

X X X X 10. Identify and explain the input channels to the automatic rod control system.

X X X 11. Explain how the rod control inputs serve to position the control rods on a given change in any one.

X X X X 12. Describe the operation of the rate comparator circuit.

X X X X 13. Discuss the purpose of the non-linear gain circuit.

X X X X 14. Discuss the purpose of the variable gain circuit.

r.eviiuii Page6of58 ARSS iL _ _ ._

Li Li 1 I 0 CA X X X X 15. Draw and explain the gull wing program.

X X X X 16. Briefly describe the purpose of each type of control rod system cabinet.

X X X X 17. Briefly explain how to start up the motor generator sets.

X X X X 18. Explain the purpose of the maintenance hold system for the control rod system.

X X X X 19. Describe the power supplies for the control rod drive system.

X X X 20. Differentiate between the Rod Urgent Failure and Non-Urgent Failure alarms. Explain the cause and effect of the alarms and how resetting of alarms is accomplished.

X X X X 21. List each of the rod control stops/interlocks and give its purpose.

X X X 22. For the rod position indicators, state the sources of signals, type of indication, and all alarms generated by each circuit.

X X X 23. Given a failure of the controlling input instrumentation for rod control and no operator action, describe the effects of rod motion on the plant, if any.

X X X X 24. Explain how a normal reactor trip occurs and how to perform an emergency reactor trip from outside the main control room.

X X X 25. Explain the bases, input, alarms, and operator actions relative to the rod insertion limits.

X X X 26. Discuss applicable Technical Specifications, Technical Requirements, and Bases. V

reviiuii t, Page 7of58 TRAINING OBJECTIVES MG SETS NOTE: Objectives wiI[ be identified in the text as Obfective MGI etc.

A R S S U 0 R T 0 0 A X X X X 1. Describe the power supply to the Control Rod Drive Mechanisms.

X X X X 2. Identify the power supply to the MG Sets.

X X X X 3. Explain what the bypass breakers are used for.

X X X X 4. Explain the function of the protective relaying equipment provided to each MG Set.

X X X X 5. Describe the position indication or annunciations the Operator has in the Main Control Room for the reactor trip and bypass breakers.

X X X X 6. Describe the daily routine checks an AUO makes on the MG Sets and CRD Equipment Room as specified in Electronic Logs.

X X X X 7. Explain how to place a MG Set in service.

X X X X 8. Explain how to take a MG Set out of service normally.

X X X X 9. Explain how to locally trip the reactor in the event of an ATWS.

WBN 10-2011 NRC RO Exam As Submitted 8/1512011

57. 015 A1.08 057 Given the following conditions:

- Unit 1 is operating at 80% steady state power with all controls in automatic.

Which ONE of the choices below completes the following sentence?

Assuming no operator action, RCS temperature will INCREASE if the (1) fails (2)

A. N43 Power Range lower detector HIGH B. N43 Power Range uer detector LOW C. Rod control auctioneered high nuclear power signal HIGH D Rod control auctioneered high nuclear power signal LOW DIS TRACTOR ANAL YSIS:

A. Incorrect, N4 I PR lower detector falling high causes sum of N4 I upper and lower detectors to fall high. This is the input into the rod control power mismatch circuit and since the auctioneered high signal (N4 1) is greater than turbine power, control rods move in, causing RCS temperature to go down. Plausible because power range detectors are input to the control program and failures can cause RCS temperature changes.

B. Incorrect, N4 I PR upper detector failing low causes sum of N4 I upper and lower detectors to decrease. One of the remaining PR detector outputs N42-N44 is already or becomes the auctioneered high signat, O.e. there is no change to the auctioneered high signal) and control rods do not move, so no change to RCS temperature. Plausible because power range detectors are input to the control program and failures can cause RCS temperature changes.

C. Incorrect, This would cause the RCS temperature to decrease because rods would insert as a result of the failure. Plausible because a failure of the auctioneered signal will cause RCS temperature to increase but it would be a failure in the opposite direction.

D. Correct, The auctioneered high nuclear power signal failing low causes control rods to move out and RCS temperature to go up. This is because the Tavg would appear to be lower than Tref.

Question Number: 57 Page 149

WBN 10-2011 NRC RO Exam As Submitted 8/15/2011 Tier: 2 Group 2 K/A: 015A1.08 Nuclear Instrumentation Ability to predict and/or monitor changes in parameters to prevent exceeding design limits) associated with operating the NIS controls including:

Changes in RCS temperature.

Importance Rating: 3.3 I 3.4 IOCFRPart55: 41.5/45.5 IOCFR55.43.b: Not applicable KIA Match: Question requires applicant to predict the effect of a failure of NIS or associated components on RCS temperature.

Technical

Reference:

WBN-SDD-N3-85-4003, Control Rod Drive System, Revision 0013 Proposed references None to be provided:

Learning Objective: 3-OT-SYSO85A

7. Describe the effects of normal control rod motion on RCS Tavg.

10. Identify and explain the input channels to the automatic rod control system.

11. Explain how the rod control inputs serve to position the control rods on a given change in any one.

Cognitive Level:

Higher Lower X Question Source:

New Modified Bank Bank X Question History: WBN bank question 015 A1.08 058 used on 2006 exam with minor formatting changes.

Comments:

Page 150

WBN System CONTROL ROD DRIVE SYSTEM WBN-SDD-N3-85-4003 Description Rev. 0013 Document Paae 59 of 81 8.3 Figure 8.3 Reactor Control System Functional Block Diagram Figure 8.3 Reactor Contr1 System Functional Block Diagram

WBN System CONTROL ROD DRIVE SYSTEM WBN-SDD-N3-85-4003 Description Rev. 0013 Document Page 61 of 81 8.5 Figure 8.5 Power Mismatch Channel, Nonlinear Gain FIGURE 8.5 Power Mismatch Channel, Nonlinear Gain 1.5 1.0 L5°F/%Aq

-3 1 2 3

-0.5

-1.0

-1.5

% aq (% Fuji Load Turbine Impulse Pressure %

Full Load Auctioeered Nuclear Flux)

WBN System CONTROL ROD DRIVE SYSTEM WBN-SDD-N3-85-4003 Description Rev. 0013 Document Paqe 62 of 81 8.6 Figure 8.6 Turbine Impulse Chamber Variable Gain FIGURE 8.6 Turbine Impulse Chambr Variable Gain 2.0 Inversely Proportional To Turbine Power

1.0 0 50% 100%

Turbine Impulse Chamber (Percent Power)

Variable Gain

WBN System CONTROL ROD DRIVE SYSTEM WBN-SDD-N3-85-4003 Description Rev. 0013 Document Page 63 of 81 8.7 Figure 8.7 Rod Speed Program FIGURE 8. 7 Rod Speed Progrem

Revision 10 Page 4 of 57 I. PROGRAM Watts Bar Operator Training II. COURSES A. License Training B. Non-License Training III. TITLE Rod Control and Motor Generator Sets IV. LENGTH OF LESSON A. Licensed Training 6 hour6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months B. Non-Licensed Training 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months V. TRAINING OBJECTIVES NOTE: OjcUves will be identified in the text as Objective RC1 etc.