Fuel Handling

Question 1

What are the purposes of the Refuel Interlocks?

Answer 1

place limitations on the movement of refueling equipment and control rod blades during certain potentially unsafe conditions.
Limit inadvertent Rx Criticality
Limit the number of ways that reactivity can simultaneously be added to core during refueling
Provide redundant methods of assuring safety during refueling should procedure violations occur.

Question 2

What are the 3 basic interlocks provided by refueling interlock circuitry?

Answer 2

Rod Block
Refuel Platform reverse travel block (Toward Rx)
Hoist Block

Question 3

What conditions, when sensed provide input to refeul interlocks?

Answer 3

All CR inserted
Refuel Platform positioned near or over RPV
Refuel Platform hoists loaded (any)
Fuel Grapple Normal Up
Position of Rx Mode Switch
Power Supplies (29-3/39-3)

Question 4

How often are Refuel Interlock Checks Required?

Answer 4

Prior to ANY fuel handling w/ head off RPV and weekly thereafter until handlings in Rx is complete (TS SR 3.9.1.1)

Question 5

What shall be done if ANY interlock is found INOP during fuel handling operations?

Answer 5

IMMEDIATELY suspend all in vessel fuel movement with equipment associated with interlock OR insert a rod block and verify ALL rods in.

Question 6

YOU STOPPED AT THE FLOW CHARTS

Answer 6

YOU STOPPED AT THE FLOW CHARTS

Question 7

What are the “FORWARD” and “REVERSE” directions of the refuel Bridge?

Answer 7

Forward is toward the fuel pool.

Reverse is toward the Rx

Question 8

What are the three basic REFUEL INTERLOCK ROD BLOCKS?

Answer 8

CR Not all IN + Second CR Selected + Mode Switch in Refuel

Any Bridge Hoist Loaded (OR Grapple not full Up) + Platform Near/Over Core + Mode Switch in Refuel

Platform Near/Over Core + Mode Switch Startup

Question 9

What COnditions will cause a REVERSE travel Block?

Answer 9

Platform Near/Over Core + Mode Switch in STARTUP

ANY hoist loaded (OR grapple not FULL UP) + CR NOT all IN + MD Switch REFUEL + Platform Near/Over Core

Question 10

What Conditions will cause Hoist Operation?

Answer 10

Monorail Hoist Loaded + CR Not all IN + Platform near/over core = STOP MONO HOIST UP OPERATION

Frame Hoist Loaded + CR Not all IN + Platform near/over core = STOP FRAME HOIST UP OPERATION

CR Not all IN + Platform Near/Over Core = STOP GRAPPLE OPERATION IN BOTH DIRECTIONS

Question 11

Who is required to oversee fuel movement operations?

Answer 11

Person holding an ACTIVE SRO license or a Senior operator license limited to fuel handling to directly supervice activities of moving fuel

Question 12

WHat must be done during fuel movements?

Answer 12

No personnel access to undervessel areas and above 2nd floor in DW

Question 13

What actions must NSO make during fuel movements?

Answer 13

NSO to verify SRM’s indicate between 3 and 100cps after TWO fuel assemblies loaded around EACH SRM

Question 14

What must be performed if Hi Rad alarm on Refuel Floor during fuel moves?

Answer 14

Evacuate Refuel Floor

Question 15

What happens if agreement cannot be met between bridge and NSO for fuel moves?

Answer 15

Contact CRNO - required to be onsite and cognizant of situation when ever fuel moved to/from reactor

Question 16

What is allowed to be performed durign rapid loss of vessel levels?

Answer 16

Supervisor may deviate from transfer sheet and put fuel in nearest open fuel storage rack or vessel location - notify control room to initiate makeup