E1-10 Fuel Handling & Transfer

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March 14, 2012

2012 Year Fourth ModuleCapacity Building Program on Nuclear Safety for Egyptian Nuclear Regulators

Fuel Handling & Transfer System

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Table of ContentsAbbreviations & AcronymsI. Introd uctionII. Design BasesIII. Major ComponentsIV. Operation during Normal Refueling OutageV. Inspection & Testing RequirementsVI. Summary

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A bb reviatio ns & A cro nym sALARA As Low As Reasonably AchievableCB Containment BuildingCEA Control Element AssemblyCVCS Chemical & Volume Control SystemFHS Fuel Handling SystemRCS Reactor Coolant SystemRHR Residual Heat RemovalFA Fuel AssemblySFA Spent Fuel AssemblyFB Fuel BuildingGDC General Design CriteriaRCCA Rod Cluster Control AssemblyRV Reactor VesselRx ReactorTIS Technical Specification

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I. Introduction - 1/3 The basic function of the FHS

To remove SFA from the Rx and, To replace them with new FA on a schedule determined by thefuel management program .

FHS is designed also to function To receive and store new FA To store and ship SFA, and To remove and replace control element assemblies.

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I. Introduction - 2/3 FHS consists of the equipment, tools and procedures forrefueling the Rx

Providing for safe and rapid handling and storage of FA. Foremost requirements in the design of FHS: Refuelingshould be accomplished with Maximum safety, A minimum probability of mishandling

Thereby avoiding damage to the FA and Rx components, ALARA radiation exposures, and Efficiency of equipment and procedures to reduce Rx downtime.

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I. Introduction - 3/3 In addition, detail designs are such that Positive grappling is provided

For all handling devices, Interlocks are used

To ensure the correct sequential operation of the system, Travel and load limits are provided

To ensure safe design conditions are not exceeded, and Either procedural or equipment backup is provided

In the event of a failure. Where practical, the equipment contains devices which will function tobring the operation to a safe condition in the event of a failure. Visibility is maximized and readout equipment is provided to allow themost intelligent operation of the equipment.

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O verview of F u el H and ling & T ransfer S ystem

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C ontainm ent & F u el H and ling A rea L ayou tCDNew Fuel Elevator C l) Fuel Handling Machiner---------------~ Fuel Building Crane Fuel Transfer SystemRefueling Machine @ CEA ElevatorCVUpender @ RB Polar Crane CEA Change Platform

@ CEA ElevatorCVUpender@ RB Polar Crane CEA Change Platform

o New Fuel Storage 8 Spent Fuel Pool@ ) New Fuel Shipping Container Unloading Areao Cask Loading Pit 0 Decontamination Pit8 Refueling Canal 0 Refueling Cavity) e Fuel Transfer CanalCDReactor Core

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Process-a

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II. Design Bases - 1/2 F H S is designed to: Be operated under a constraint such that only one SFA issuspended in each building area (containment or fuel handling)at anyone time.

To be consistent with the assumptions of the postulated fuelhandling accident which assumes total mechanical damage to asingle dropped FA.

Support maximum loads under design earthquake conditions. To prevent fuel damage from an earthquake.

Preserve the integrity of containment (where the systempenetrates containment). To ensure containment integrity.

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II. Design Bases - 2/2 Maintain the minimum required depth of water shielding. Cranes and hoists used to lift SFAs are required to have limitedmaximum lift heights.

To ensure adequate radiation shielding is maintained. Be operated under a constraint such that a spent fuel shippingcask drop accident will not cause any fuel damage. Assured by requiring (via Tech Specs) that all FAs be stored outsideof the exclusion zone during cask handling operations

To prevent the possibility of fuel interaction if a shipping cask isaccidentally dropped. To prevent fuel damage or an unsafe fuel configuration. Prevent inadvertent movements following loss of power.

Equipment used to transfer or lift FAs have positive latching devices andautomatic braking devices for this purpose. To ensure there are no inadvertent movements on loss of power.

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III. Major Components New Fuel Storage Rack Reactor Cavity Pool Seal Assembly Transfer Tube Assembly Spent Fuel Storage Rack Others Refueling Machine

CEA Change Platform Spent Fuel Handling Machine New Fuel Elevator Closure Head Lift Rig Upper Guide Structure Lift Rig Fuel Transfer System, Carriage & Upender CB Hydraulic Power UnitIft1 W~~J;l~~~'~~~

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New Fuel Storage Rack+ A 12 x 12 cavity new fuel storage rack for storage of 72 new fuel assemblies

welded stainless steelI ~l_tLO!KIll~,

~I,O~~configuration is similar to the spent fuelstorage rack design.I I+ Cavity blocking devices will be utilizedto affect a storage configuration whichwill result in an effective multiplicationfactor (Keff) within allowable limits

s 0.98 even if a foam or water mist ofoptimum moderator density ishomogenously dispersed inside and/oroutside the stored fuel.

s 0.95 assuming the storage area is floodedwith un-borated water

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Reactor Cavity Pool Seal Assembly+ Spans the annulus between theRV flange and the refueling poolfloor.

The seal consists of a stainless sealplate with 2 attached inflatableelastomer seals. After installation and testing, thepool can be filled with water for therefueling operations.

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Transfer Tube Assembly Provides the interconnection

between the CB and the FBpools for underwater passageof the FA via the fuel transfersystem.

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Spent Fuel Storage Rack+ Minimum storage capacity: 632 FAs 10 batches x 45 FA/batch + 177 FA/core +5 failed fuel canister

initial U-235 enrichment of FA is s 4.3%.+ Nine (9) 10 x 12 modules having ausable total capacity of 678 FA areprovided.

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Other Components

Refueling Machine CEA Change Platform Spent Fuel Handling Machine New Fuel Elevator~>~ . .. ..t~ ~ - r ; ; M . _ ' "

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Fuel Transfer System,Carriage & Upender CBlosure Head Lift Rig Upper Guide Structure Lift Rig Hydraulic Power Unit,.tll W~~J;l~~~'~~~lan& 1 < 0 0 0 E A II\!L~mlJl~~ N I J C L I ! l J i t l ' S ; ! i , ~ E f Y 17


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IV. Operation during Normal Refueling Outage Preparation Rx disassembly Fuel handling Rx assembly

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Preparation RCS clean up and decontamination Accomplished by CVCS prior to shutdown

In order to minimize the radiation exposure during the refueling, Containment atmosphere clean up

Accomplished by purge and filtration system Rx is shutdown and cooled to cold shutdown conditions A final effective multiplication factor (Keff) < 0.95 (all rods in) and RCS temperature < 140F (MODE 6). Following a radiation survey, the CB is entered.

At this time, RV water level is lowered to a point slightly below the RV flange. Then the fuel transfer equipment and manipulator crane are checked forproper operation.

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Rx Disassembly - 1/2 Begins with the removal of the missile shield All cables, air ducts, and insulation are then removed from theRV head.

RV stud tensioners are used to de-tension the vessel studs The refueling cavity is then prepared for flooding by

sealing off the reactor cavity; checking the underwater lights, tools, and fuel transfer system; closing the refueling canal drain valves; and removing the blind flange from the fuel transfer tube.

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Rx Disassembly - 2/2+ With the refueling cavity prepared for flooding, RV head is unseated and raised approximately 1 foot above the RVflange.

Water from the RWST is pumped into the RCS by RHR pumps Causing the water to overflow into the refueling cavity.

+ The RV head and the water level in the refueling cavity are raisedsimultaneously, Keeping the water level just below the head.+ When the water reaches a safe shielding depth, RV head is taken toits storage pedestal. Control rod drive shafts are then disconnected and, with the upperinternals, are removed from the vessel.+ FAs and RCCAs are now free from obstructions Core is ready for refueling.

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Fuel Handling Fuel handling can start after the reactor has been subcritical for 100 hours

(TIS requirement). This time allows for the short-lived fission products to decay.

Refueling sequence is started with the manipulator crane. SFA are removed from the core. Positions of partially SFAs are changed (fuel shuffle) and New FAs are added to the core

Reactor AssemblyAchieved, following refueling, by reversing the operations given in ReactorDisassembly

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v. Inspection & Testing Requirements Fuel Handling Machine, Refueling Machine, etc., Minimum Acceptable Shop Test

Load Test at 1250/0 of Rated Load Functional and Running Operation

Maintenance and Checkout Test Visual Inspect(Loose or Foreign Parts, Dirt and Grease) Proper Lubricant(Wheel, Gear) Inspect Hoist Cable(Worn, Broken) Visual Inspect Limit Switch Check the Functional & Running Operation

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VI. Summary The basic function of the FHS To remove SFA from the Rx

To replace them with new FA into the Rx Preparation, Rx disassembly, Fuel handling, Rx assembly

Design Bases Support maximum loads under design earthquake conditions Preserve the integrity of containment Maintain the minimum required depth of shielding

Backup devices Positive grappling, interlocks, travel & load limits, procedural orequipment backup

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The strength of a chain isin its weakest link!25


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Thank you forYour Attention

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Jill ~~~ht~cnB71~~KlnEi KOREA INST ITL !I fEO f Nl ! ICLEAR SAFETY

E1-10 Fuel Handling & Transfer

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