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Systems Test 4 > LOT 201.43,44,45 Refueling Operations > Flashcards

LOT 201.43,44,45 Refueling Operations Flashcards

1
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

What is the definition of core alterations?

A
  • Movement of:*
  • *Fuel**
  • *Sources**
  • *Reactivity Control Components**
  • Excludes RCCAs attached to integrated head*
  • Applicable:*
  • *Head Removed**
  • *Fuel in Core**
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2
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

Which hoist is used to snare the loop of the emergency transfer cart during a traverse drive failure of the fuel transfer system?

A

FHB Aux Hoist

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3
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

What is the minimum water level of the SFP?

A
  • *23 ft**
  • Above the top of fuel assemblies in racks*

Basis: Iodine removal of the assumed 99% of the iodine gap activity from a ruptured irradiated Fuel Assembly.

Must secure fuel movements at 62 ft (22.25 ft above fuel racks).

  • Note:*
  • Top of fuel racks is 39.75’. Fuel sits ≈ 12” farther down.*
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4
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

What is the the 2 ton hoist designed to lift?

A
  • *Fuel Assembly and RCCA (1)**
  • 1,900 lbs*
  • *Failed Fuel Container (1)**
  • 1,700 lbs*
  • *The Tool (1)**
  • 400 lbs*
  • Note:*
  • Overload protection provided at 125% (5000 lbs)
  • Overload protection device that can withstand single failure.
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5
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

What are the design requirements for the Spent Fuel storage racks?

A
  • *< 1.0 keff**
  • Unborated water*
  • *≤ 0.95 keff**
  • 700 ppm boron*
  • *Region 1: 10.95” center to center**
  • Distance between fuel assemblies*
  • *Region 2: 9.15” center to center**
  • Distance between fuel assemblies*
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6
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

What is the capacity of the new fuel storage racks?

A

66 Fuel Assemblies

≈ 1/3 of core

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7
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

The weight indicator should be watched continuously while lowering or raising the refueling machine hoist. What weight change would cause the operator to stop hoist motion?

A
  • *200 lbs**
  • Applicable with or without a fuel assembly engaged.*

Underload safety circuit prevents hoist going down with fuel assembly if a 150 lbs weigh loss occurs except during last 1.5” of travel.

  • Note:*
  • Prevents damaging adjacent fuel assembly.*
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8
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

What is the storage capacity of the region 1 and region 2 areas of the SFP?

A
  • Region 1:*
  • *288**
  • Spaced farther apart*
  • Region 2:*
  • *1681**

Total: 1969

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9
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

What must the boron concentration of the SFP be if fuel is stored in the SFP?

A

≥ 2500 ppm

LCO 3.9.13 SFP Minimum Boron Concentration

Applicability: ≥ 1 fuel assembly stored in the SFP racks.

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10
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

What is the capacity of the in-containment fuel storage racks?

A

64 Fuel Assemblies

≈ 1/3 of the core

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11
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

When must the fuel handling machine be operated in slow hoist speed?

A

Seating/Removing tool on fuel assembly

Assembly being lowered and within 10” of racks

Assembly being lowered and within 10” of bottom

Hoist Speed:

  • Normal: 20 fpm
  • Slow: 3 fpm (Machine set for 7 fpm but operator must jog to get 3 fpm)

Bridge:

  • Normal: 30 fpm
  • Slow: 10 fpm
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12
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

When is a spent fuel assembly transferred from region 1 to region 2 in the SFP?

A

All spent fuel initially sent to Region 1

  • *Begin moving 50% of fuel to region 2 after 20-30 days**
  • B5B Security*
  • *Must be completed moving fuel within 60 days**
  • B5B Security*
  • *Rest moved at ≈ 1 year**
  • Before next outage*
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13
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

What are the requirements to disengage a fuel assembly from the refueling machine?

A

“Gripper Mast Down” Light on

“Slack Cable” Light on

Load cell indicates < 480 lbs

  • *SR Counts are stable**
  • Must call MCR*

Z-Axis tape shows fuel assembly fully inserted

Permission from Core Loading Supervisor

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14
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

What powers the major equipment for the fuel transfer system?

  • Fuel Handling Machine
  • FHB Console for fuel transfer machine
  • RCB Console for fuel transfer machine
A
  • Fuel Handling Machine / FHB Console:*
  • *MCC 1J4**
  • 41’ MAB*
  • RCB Console:*
  • *MCC 1K1**
  • 35’ EAB Pen Space*
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15
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

What fills the FHB and RCB fuel transfer system hydraulic reservoirs?

A

Demin Water

RCB Side: DWS-1613 (64’9” near RCP “D” Standpipe)

FHB Side: DWS-1612 (68’ near PASS Lab)

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16
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

What are the refueling machine hoist’s automatic slow zones?

A
  • Top of the Core:*
  • *20” Above - 10” Below**
  • Can be bypassed with open water permissive*
  • Bottom of the Core:*
  • *20” Above**
  • Top of Upender:*
  • *10” Above - 10” Below**
  • Bottom of Upender:*
  • *12” Above**

Slow Zones occur entering or exiting core.

17
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

What are the different overloads in the fuel transfer system?

A
  • 250 lbs overload (1 sec TC):*
  • *Active in-between slow speed regions**
  • *Can be bypassed in opposite direction of travel**
  • If load does not diminish (5 sec TC) after bypassing and reversing travel, system will lockup in both direction and a Traverse Motion Fault will occur*
  • 600 lbs overload:*
  • *Active in-between slow speed regions**
  • Cannot be bypassed*
  • 150 lbs overload:*
  • *Active in slow speed regions**
  • (Last few inches of travel)*

Tells system carriage in position

Max expected drag for new fuel is 150 lbs and spent fuel is 250 lbs. Notify Rx Engineering if exceeded.

  • Note:*
  • Can always defeat interlocks with interlock override or manual handwheel. (Core Load Supervisor permission req.)*
18
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

What is the function of the upper limit switch on the fuel handling machine?

A

When fuel assembly fully raised, bottom nozzle will clear highest obstruction in SFP by ≥ 6 inches

19
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

What interlocks are associated with the new fuel elevator?

A
  • *Will not raise elevator with load sensed**
  • Detected by motor current*

Taking bypass key switch to bypass and pressing the bypass pushbutton OR up pushbutton will raise new fuel elevator with load to ≈ 10 ft below waterline for fuel repairs.

20
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

What conditions will make the operator secure a core alteration?

A

Loss of communications with the MCR

Loss of audible count rate in the MCR or RCB

SR NI counts double on both

SR NI Counts ↑ 5x on 1 SR Detector

RHR changes by 10 ˚F or 25 ppm boron

  • *RCS < 2800 ppm boron**
  • Systems that are connected to RCS (Cavity/SFP/RHR)*

Water not clear enough

  • *High SFP Temperature**
  • Plant Curve Book (118 ˚F)*

Load Limits on Refueling Machine/Aux Hoist exceeded

Communications between FHB/RCB control consoles, Refueling Machine, Fuel Handling Machine, and Rx Engineer in MCR required.

21
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

How long must the reactor be shutdown prior to removing fuel?

A

100 hrs

TRM 3.9.3 Decay Time

Applicable: During movement of irradiated fuel in the Rx Vessel

22
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

What are the design requirements for the new fuel storage racks?

A
  • *≤ 0.98 keff**
  • Optimum Moderation*
  • *≤ 0.95 keff**
  • Flooded with unborated water*

U-235 enrichment ≤ 5%

  • *21” center - center**
  • Distance between fuel assemblies*
23
Q
  • LOT 201.43,44,45 Refueling Operations*
    • *

How many SR detectors must be operable while in MODE 6?

A

2 SR Detectors

Both with visual indication

One with audio for MCR and Containment

1 Extended Range may be substituted for 1 SR if remaining SR provides audible count rate.

Systems Test 4 (14 decks)

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