What happened underground remains a mystery and a danger
More than five months after the February accident, official still have no certain understanding of what went wrong. It is generally thought that one 55 gallon drum of waste (perhaps more than one) overheated and burst, spilling radioactive waste in a part of the storage area known as Panel 7, Room 7. This room, designated a "High Contamination Area," measures 33 by 80 feet and presently has 24 rows of waste containers. The room holds 258 containers, tightly stacked and packed wall-to-wall, with no aisles to allow easy access. There is some clearance between the top of the stacks and the room's ceiling.
The high contamination in Room 7 is a threat to human inspectors, limiting inspection of the room to date to mechanical means, primarily cameras on extension arms. As a result of these limitations, WIPP teams have inspected only ten of the 24 rows of waste containers in Room 7. Rows #1-14 have been out of reach of the available equipment.
WIPP has begun building a full scale replica of Room 7 above ground, to provide a realistic staging area in which to test methods of remote observation that might reach the 14 uninspected rows. According to WIPP:
Options include a device that uses carbon fiber rods to extend the camera, a gantry camera suspended on wires, or a boom system mounted on a trolley that would move across the waste face from wall to wall and out 90 feet to view all rows of waste.
WIPP has spent much of June improving the air filtration system to the mine, adding filters that reduce escaping radiation and improving underground air flow for the sake of entry teams. WIPP suspended underground entries on May 31, apparently to improve safety conditions. Reporting on June 18, field manager Jose Franco wrote:
Since the radiological event, we have safely entered the underground facility nearly a dozen times. Each time, we learn more and we use those discoveries to refine our tasks moving forward. Our entry teams have identified a breached container and we are using all of the resources at our disposal to find the cause.
No one is more eager than we are to determine what happened and return to normal operations.
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