What happened at WIPP in February 2014

Burned Truck
S
alt hauling truck after the fire

Two isolated events took place at the Waste Isolation Pilot Plant (WIPP) in February.  On February 5, a salt haul truck caught fire.  Workers were evacuated, and the underground portion of WIPP was shut down.  Six workers were treated for smoke inhalation.

Nine days later, late in the evening of February 14, a second, unrelated event occurred when a continuous air monitor (CAM) alarmed during the night shift.  Only 11 employees were at the WIPP site on the surface, and no employees were in the underground.  Two other WIPP employees reported to the site a couple of hours later.  The CAM measured airborne radioactivity close to the operating location where waste was being emplaced.  Ventilation air is pulled from the underground repository by huge fans on the surface.  This exhaust consists of unfiltered air. 

 

WIPP underground cutaway

When the CAM alarmed, two dampers were automatically closed in the exhaust duct, redirecting the exhaust through high efficiency particulate air (HEPA) filters that remove radioactive particles.

The next day, an aboveground exhaust air monitor on the WIPP site detected very low levels of airborne radioactive contamination.  The 140 employees at the site were kept indoors as a precaution, and non-essential personnel were later released via surveyed routes.
 
It is believed that a small amount of radioactivity went through the exhaust duct dampers.  The exhaust duct dampers are large “butterfly” valves that are designed to close and cut off the air flow through the exhausters.  However, the valves do not fully seal the exhaust ducts and still allowed a small amount of unfiltered air to escape.  The dampers have since been sealed with high-density expanding foam insulation. 

The 13 employees present during the radioactive release event on February 14 were tested for internal radioactive contamination after the event.  Initial fecal samples measured some radioactivity above normal background levels, with follow-up urine samples showing no detectable amounts of radioactivity.  All had negative chest counts, which indicated they have no detectable radioactive contamination deep in their lungs.  The 140 employees at the site the following day were also offered testing, with 118 showing no detectable levels of contamination.  The remaining 22 were notified that their exposure was below the 10 millirem level, which is about the same exposure a person would get from a chest x-ray.

Onsite Underground Ventilation Sampling Results PDF Image
Radiological Modeling Results PDF Image

WIPP ventilation system

 

Accident Investigation board Reports

As a result of the February events -- the February 5 salt haul truck fire and the February 14 radiological release -- the Department of Energy (DOE) established two Accident Investigation Boards (AIB) to assess the WIPP safety systems programs and processes at the federal and contractor levels.  These investigations include analysis of training and qualifications, maintenance, and emergency management response to the events.

The AIBs use a rigorous process to investigate events that had, or potentially could have had, a negative impact on employees, the public or the environment.  The DOE Carlsbad Field Office and its contractor, Nuclear Waste Partnership, made every aspect of WIPP operations available to the investigation teams. 

The AIBs develop Judgments of Need (JON) that form the basis for corrective actions designed to prevent the recurrence of events.  DOE Headquarters, the Carlsbad Field Office and Nuclear Waste Partnership will develop and implement these corrective actions as part of the recovery process.

The AIB report on the haul truck fire was released March 7, 2014. To view the report, click on the following link.

 

The AIB report on the radiological event is being issued in two phases.  Phase I focuses on the release of radioactive material from the underground to the environment and the follow-on response to the release.  The Phase I AIB report was released April 24, 2014. To view the report, click on the following link.

 

The Phase 2 report will be focused on determining the direct cause of the radiological release.  A date for this report is yet to be determined.


Media Contact for Recovery

Tim Runyon
U.S. Department of Energy
WIPP Recovery Communications
P.O. Box 3090
Carlsbad, NM 88221-2078 
Phone: (575) 234-7545
E-mail: Tim.Runyon@cbfo.doe.gov

Donavan Mager
Manager Communications
Nuclear Waste Partnership LLC
P.O. Box 2078 GSA-104
Carlsbad, NM 88221-2078
Phone: (575) 234-7586
E-mail: Donavan.Mager@wipp.ws