# Refuel

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1. A core offload is in progress on Unit Two. After releasing a fuel assembly in the spent fuel pool the operator raises the main hoist to a safe elevation to pass through the transfer canal but not completely to the Normal-Up position.

While traveling towards the reactor core (reverse motion) a control rod is inadvertently withdrawn to position 02.

Which refueling interlock(s) will actuate when the refueling bridge is positioned over the reactor vessel? (Actuating proximity switch LS1)

A. Rod out block and main hoist motion block only.
B. Bridge reverse motion stop and rod out block only.
C. Bridge reverse motion stop and main hoist motion block only.
D. Rod out block, bridge reverse motion stop, and main hoist motion block.
D. Rod out block, bridge reverse motion stop, and main hoist motion block.

A rod block is generated because the bridge is near or over the core with the main hoist not full up. A bridge reverse motion stop is generated because the main hoist is not full up and all rods are not full in. A main hoist motion block is generated because the bridge is near or over the core and all rods are not full in.
2. What is the correct orientation of a fuel assembly that is properly installed in the reactor core at coordinates 33·12?

A. North East
B. North West
C. South East
D. South West
A. North East

Using a core map, the XX co-ordinate runs east-west, and the YY co-ordinate runs north-south. The correct orientation is the where the channel fastener is.
3. What is the purpose of the Refueling Interlocks?

A. Limit the probability of an inadvertent criticality during refueling.
B. Minimize the probability of loading fuel into a cell that has no control rod.
C. Prevent control rod withdrawal when the reactor mode switch is in STARTUP.
D. Prevent bridge travel over the core when the reactor mode switch is in REFUEL
A. Limit the probability of an inadvertent criticality during refueling.
4. A core reload sequence is in progress in accordance with 0FH-11, Refueling. The initial loading of fuel bundles around each SRM centered 4-bundle cell was completed with all four SRMs fully inserted and reading 50 cps. After loading many additional fuel bundles, the Control Operator logs the following SRM readings for the specified number of bundles loaded:

Bundles Loaded SRM Counts

520 A – 100, B – 90, C – 160, 0 – 120

521 A – 120, B – 125, C – 175, 0 – 125

522 A – 150, B – 130, C – 210, 0 – 140

523 A – 190, B – 160, C – 260, 0 – 150

In accordance with 0FH·11:

A. fuel loading may continue.
B. fuel loading should be suspended at step 523.
C. fuel loading should have been suspended at step 522.
D. fuel loading should have been suspended at step 520.
B. fuel loading should be suspended at step 523.

Per FH-11, fuel loading should be suspended anytime count rate doubles with a single bundle load or increases by a factor of 5 relative to the base count rate established when the 4 bundle cells are loaded around the SRM detectors. With this initial count of 50, the 5-time increase occurs at step 523 when SRM C reaches 260.
5. The following plant conditions exist during a fuel shuffle on Unit Two (2):

- RHR Loop “A” is in SDC and has been in operation for the past 48 hours
- NO recirculation pumps are running
- Because SDC flow is disturbing the visibility, the Refuel Floor SRO requests SDC be secured to allow completion of several fuel movements
- The request is granted and SDC is secured at 08:00

The Technical Specification implication of this action is:

A. SDC must be started before 10:00 to avoid declaring the LCO statement not met.
B. SDC must be started before 09:00 to avoid declaring the LCO statement not met.
C. At 08:00, TS 3.9.7, Condition C must be entered and the required action taken.
D. At 08:00, TS 3.9.8, Condition C must be entered and the required action taken.
A. SDC must be started before 10:00 to avoid declaring the LCO statement not met.
6. Unit One (1) is in a refueling outage with Alternate Decay Heat Removal utilizing Natural Circulation and the Fuel Pool Cooling System in service for 24 hours. The following data has been recorded on 1OP-17, Attachment 9:

Reactor Cavity Water Surface Temperature At Inlet To Weir
Weir #1 117°F
Weir# 2 114°F
Weir# 3 112°F
Weir# 4 115°F

SFP Water Surface Temperature At Inlet To Weir
Weir #1 104°F
Weir# 2 100°F

LCO 3.9.7, Action C.1 is:

A. Met, all temperature readings are satisfactory.
B. NOT met, SFP water surface temperature at inlet to weir ΔT is excessive.
C. NOT met, reactor cavity water surface temperature at inlet weir ΔT is excessive.
D. NOT met, the difference between reactor cavity and SFP average temperatures is excessive.
B. NOT met, SFP water surface temperature at inlet to weir ΔT is excessive.
7. A double blade guide is used to provide:

A. Support to a control rod when more than 2 diagonally adjacent fuel assemblies are removed from a single fuel cell.
B. Support to the two adjacent fuel assembles in a fuel cell when a control rod is removed or fully withdrawn.
C. Alignment during the replacement of a fuel support piece into the RPV.
D. Lateral support to fuel bundles between two diagonally adjacent fuel cells.
A. Support to a control rod when more than 2 diagonally adjacent fuel assemblies are removed from a single fuel cell.
8. Core refueling is in progress. All control rods are fully inserted into the reactor core. A fuel assembly is grappled in the fuel pool and raised to the normal-up position.Which refueling interlock will be in effect, if any, as the bridge is moved over the reactor core?

A. Rod out block
B. Bridge reverse motion stop
C. Main hoist motion block
D. None in effect
A. Rod out block
9. Mode 5
- Reactor Mode Switch in REFUEL
- Refueling Bridge is over the spent fuel pool
- Refueling bridge main hoist is loaded with a new bundle
- Frame mounted and monorail hoist are unloaded
- Control Rod 46-11 is selected and withdrawn to 48

The refueling bridge is moving from the spent fuel pool toward the reactor vessel. When the refueling bridge actuates the core proximity limit switch (LS1), this results in a:

A. Main Trolley Motion Stop
B. Bridge Reverse Motion Stop
C. Monorail Hoist Motion Stop
D. Frame-Mounted Hoist Motion Stop
B. Bridge Reverse Motion Stop
10. Considering each of the following grapple configurations, which grapple configuration(s) will allow the Main Hoist to be raised but not lowered?

1. Grapple normal up
2. Slack cable
3. Hoist Loaded

A. 1 only
B. 2 only
C. 3 only
D. 1, 2 & 3
B. 2 only
11. What automatic action occurs if both Refuel Bridge Main Hoist Grapple Hooks are not open five seconds after placing the Engage/Release Switch to RELEASE?

A. Fault lockout is generated
B. Grapple hooks will re-close
C. Main hoist motion block is generated
D. Dual Motor Drive (DMD) system trouble is operated
B. Grapple hooks will re-close
12. What is the circuit breaker that can be opened to remove all electrical power to the refueling bridge except for that power coming from the MCC supply?
CB50, Main Refueling Bridge Supply Breaker
13. While lowering the Main Hoist to grapple a test weight, a small electrical fire occurs in the Main Hoist Drive Motor. The QUICKEST way to ASSURE all electrical power is removed to the Main Hoist Drive Motor is to:

A. Depress the STOP pushbutton on the Left-Hand Controller.
B. Dispatch an AO to open the supply breaker to the refuel bridge at the MCC.
C. Open Main Supply Breaker CB-50 on the Refueling Bridge West End Truck.
D. Release the GRAPPLE RAISE-LOWER switch on the Right-Hand Controller.
C. Open Main Supply Breaker CB-50 on the Refueling Bridge West End Truck.

Depressing the STOP pushbutton does not remove power to the Main Hoist Drive Motor.
14. Which of the following sets of conditions describes when the FUEL HOIST INTERLOCK will be actuated during fueo movement and the effect?

A. The bridge is near or over the core and all control rods are NOT fully inserted.
Only prevents upward movement of the main hoist (grapple).

B. Bridge is near or over the core and all control rods are NOT fully inserted.
Prevents movement of the main hoist (grapple) upward or downward.

C. The bridge is over the core or in the spent fuel pool and all control rods are NOT vull inserted. Prevents movement of the main hoist (grapple) upward or downward.

D. All control rods are NOT fully inserted. Prevents motion beyond the limits ipmosed by the Boundary Zone Controller regardless of the position of the travel override pushbutton.
B. Bridge is near or over the core and all control rods are NOT fully inserted. Prevents movement of the main hoist (grapple) upward or downward.
15. Unit Two (2) is conducting refueling operations. After placing a fuel assembly in the spent fuel pool, the refuel bridge operator raises the main hoist to a safe elevation to pass through the transfer canal but not completely to the Normal-Up position. During bridge movement towards the reactor core, the position indication fails for Control Rod 26-27 causing a loss of all position indication for the rod.

Which refueling interlock(s) will actuate when the refueling bridge is positioned over the reactor vessel?

A. Rod Out Block only.
B. Bridge Reverse Motion Stop only.
C. Bridge Reverse Motion Stop and Main Hoist Motion Block only.
D. Rod Out Block, Bridge Reverse Motion Stop, and Main Hoist Motion Block
D. Rod Out Block, Bridge Reverse Motion Stop, and Main Hoist Motion Block
16. Unit Two (2) is conducting fuel moves in the core. The refuel floor SRO just reported that a bundle was latched in the core and is bing transported to the fuel pool. Plant Security just notified the Unit SRO that an Imminent Airborne Threat (Security Threat) has been declared for the site.

Which one of the following actions must be directed by the refuel floor SRO?

A. Place the bundle in the original location in the core, leave the grapple engaged.
B. Place the bundle in the first available locaton, disengage the grapple, and remove from the bail handle.
C. Place the bundle in the original location in the core, disengage the grapple, and remove from the bail handle.
D. Immediately leave the refuel floor with the bundle suspended after verification that the engage light is illuminated.
C. Place the bundle in the original location in the core, disengage the grapple, and remove from the bail handle.
 Author: heidin ID: 156505 Card Set: Refuel Updated: 2012-05-30 21:09:34 Tags: Refueling Interlocks ILC Folders: Description: questions Show Answers: