North Damping Ring Ceiling Penetration

Core Drilling of the NDR vault ceiling, December 1999.
Click on the thumbnail image for the fullsize picture.

 
 
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"The Team" 
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Core drilling in progress, viewed from above. 
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Core drilling rig. 
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Core being removed from above. 
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Core ready for disposal. 
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Core removed from the NDR has none of the micro-cracks seen in the SDR core. 
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New penetration viewed from the NDR vault. 
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MFD has the new sleeve ready to insert in the ceiling penetration. 

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