Fuel Handling

Question 1

What are the circumstances that would cause you to suspend core loading?

What about suspending core un-loading?

Answer 1

• **unexpected increase in counts 3 X in any responding detector
• **unexpected increase in counts 2 X in all responding detectors
• **communications lost between CNMT and CR
• unexpected change in RCS temp > 20 deg
• measured [B] change > 50 ppm from start of core loading
• loss of one SR detectors
• **CNMT evacuation alarm

** suspend core un-loading

Question 2

What are the two interlocks (one has to be met) that permit the Manipulator Crane (CNMT fuel) to bridge and trolley?

Provide status of height and gripper for each interlock

Answer 2

• Tube up
  
  • height at upper limit
  • gripper engaged
• Gripper Up Disengaged
  
  • height above GUD stop (lower than tube up)
  • gripper disengaged
  • hoist has < 1200 lbs (no f.a.)

Question 3

What are the safe locations to place a fuel assembly during a condition that requires evacuation?

Answer 3

• up-ender and lowed
• spot where fuel came from
• safe s/d position

in Rx - open baffle is sufficient (not next to core in unanalyzed position)

Question 4

During normal configuration what is preventing a refueling operator from placing a spent fuel assembly in the new fuel elevator and raising it to the top of SFP?

What protects the refueling operators from raising a fuel assembly to close to the surface of SFP when using the spent fuel handling tool?

Answer 4

• administative controls only
• physical length of spent fuel handling tool

Question 5

Describe process from taking new fuel assembly in cask washdown pit to placing in SFP storage racks.

Answer 5

• use bridge crane and new fuel tool to lift new fuel assembly out of cask wash down pit
• when hoist raised all way, new f.a. clears wall to SFP
• lower new f.a. into SFP new fuel elevator (with elevator all way up, new fuel tool does not enter water)
• lower new fuel elevator to bottom of SFP
• use spent fuel handling tool to lift f.a. and place in storage rack

Question 6

What is the construction (include isolations) of the transfer tube?

Answer 6

• tube that connects the CNMT refueling cavity to the FHB transfer canal
• CNMT side = flange (bigger than opening)
• FHB side = valve (SFS-50)

Question 7

How are the upender controls shared/distributed between the FHB and CNMT upender operators?

Answer 7

CNMT

• raise and lower his upender
• conveyor (cart) to FHB (pit) or CNMT (rx)

FHB

• raise and lower his upender
• secure control power to conveyor (cart)

Question 8

Manipulator crane overload setpoint

Answer 8

2180 lbs

Question 9

P&L for water level in SFP and RX cavity

Answer 9

Maintain water level greater than 23’