Unit 4 Fuel Removal May Start Monday

According to a document TEPCO released this week, as long as third party inspections are passed Thursday and Friday work to removal fuel may start on Monday.

A dry run of cask handling was done on November 13th along with a mock fuel removal using “simulated fuel”. TEPCO has outlined a bit more about processes and safety mechanisms put in place. TEPCO did have training time blocked off in the schedule, so some sort of unified training for the work teams will take place.

TEPCO outlined these safety prevention tactics (machine translation)

Of fuel handling machine | fuel fall Failure or incorrect operation

  • Hoist the structure that holds the electromagnetic brake to power failure

  • And fuel gripping machine structure the hook is not open to the air source upon loss

  • And mechanical interlock of fuel gripping machine

  • And fuel gripping machine structure to hold the wire rope double

  • Check the hold state of the fuel in water camera

 

The erroneous operation, failure of the crane | cask drop

  • The structure and equipment to be held in the electro-hydraulic brake push-up machine to power failure hoisting

  • Duplex wire rope, brake, of hangers

  • The hook structure having a device to stop off

  • Crane work before the start of pre-inspection of equipment as suspension

  • And confirmation of the attachment status before lifting

TEPCO also included a few photos of the cask handling process:
U4_fuelremoval_131113_06

U4_fuelremoval_131113_07

 

Adding to the complexity of the fuel removal is some damaged assemblies found in the pool. TEPCO says these are from before the disaster but one is bent at a 90 degree angle. TEPCO will have to adopt special procedures to get those assemblies out of the pool.

A machine translation of the Japanese TEPCO document can be found here.
https://docs.google.com/document/d/1vKCCDP5kruiPpDjceLdXMWVpeIXFA7aJYUcxFElnEZE/edit?usp=sharing

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