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Posts Tagged ‘explosion’

Explosion at one of the Japanese nuclear power plants damaged by the earthquake

Posted in Global Warming, tagged Containment building, explosion, Nuclear Power, Nuclear reactor core, Nuclear Regulatory Commission, public citizen texas on March 12, 2011 | Leave a Comment »

According to an update from the Nuclear Information and Resource Service (NIRS) an explosion has occurred at Fukushima Daiichi Unit 1.

Video of the aftermath of the explosion shows that the containment building
has been destroyed.

The NIRS update goes on to explain, in a General Electric Mark I reactor, the containment building is fairly weak and is considered the secondary containment. The primary containment is a steel liner that surrounds the reactor core. So far, video and photos have not been clear enough for us to determine whether this steel liner is intact.

Radiation levels at the site are reported to be 1,015 micro/Sieverts per hour. This is roughly equivalent to 100 millirems/hour. The allowable annual dose for members of the public from nuclear facilities in the U.S. is 100 millirems/year. The allowable annual dose for nuclear workers is 5,000 millirems/year. The average annual background dose from all radiation sources in the U.S. is about 360 millirems/year.

The explosion in Unit 1 was almost surely a hydrogen explosion. Pressure has been building up in the containment since offsite power was lost to the reactor because of the earthquake/tsunami. The GE Mark I reactor design is called a “pressure suppression” design. Rather than be built to withstand large pressure increases, General Electric sought with this design to attempt to reduce such increases in an accident scenario. The design has been criticized by independent nuclear experts and even Nuclear Regulatory Commission staff for many years (see: http://www.nirs.org/factsheets/bwrfact.htm). In this case, the design clearly did not work. 24 U.S. reactors use the GE Mark I design.

The evacuation zone around the site has been expanded to 20 kilometers (about 12 miles). Another reactor at Fukushima Daiichi, Unit 2, is reported to be without cooling capability at this time. Three reactors at the nearby Fukushima Daini site are reported to be without cooling capability. These are GE Mark II designs, which are considered a mild improvement over the Mark I design. Both sites are on the Pacific Ocean, about six miles apart.

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More natural gas pipeline explosions in Texas

Posted in Energy, tagged explosion, fossil fuels, pipeline, Renewables, Texas on June 8, 2010 | 1 Comment »

After Monday’s deadly explosion of a pipeline in Johnson County, there was another explosion in the Panhandle today. From the Austin-American Statesman:

The blast near Darrouzett, just south of the Oklahoma border, was the second fatal natural gas explosion in Texas in as many days. On Monday, a worker was killed when a utility crew accidentally hit and ruptured a natural gas line in rural Johnson County, about 30 miles south of Fort Worth.

Tuesday’s blast involved a crew that was removing clay for a dirt-contracting company, Lipscomb County Sheriff James Robertson said in a news release. The explosion happened when a bulldozer struck a pipeline.

***

Three other workers were injured. One was taken by helicopter to a hospital in Oklahoma City. Two others escaped with injuries that were not considered life-threatening.

The utility crew involved in Monday’s explosion worked for Oklahoma-based C&H Power Line Construction Services. Fred Haag, the company’s chief operating officer, said the crew followed the proper procedures in locating the line before digging. It used a survey map and made calls verifying the line location, he said.

***

“Even at night, the soles of their shoes were melting because it was still extremely hot,” said Jack Snow, Johnson County’s emergency management coordinator.

At least seven of the other 13 workers who had been close to the site were treated at hospitals, mostly for burns to their necks and arms as they ran away from the massive fireball, Haag said. Only one worker remained hospitalized Tuesday, he said.

A 23-member crew that had been working in the area for several months was drilling a hole Monday for an 80- to 120-foot utility pole when the gas line was struck and ruptured, sending a massive fireball into the air that burned out about two hours later after the gas flow was shut off.

***

After investigators finish looking over the site, workers will repair the ruptured pipeline, which is expected to take several days, said Houston-based Enterprise Products Partners LP, which partially owns the 36-inch-diameter line. It is a 395-mile segment of a pipeline extending from western to eastern Texas, the company said in a Tuesday news release.

Unlike other cases (BP oil spill, Massey mine explosion, etc) this does not look like a problem of lax oversight, but merely the inherent dangers of fossil fuels. As I wrote in a editor’s note in Ali’s post:

All of this comes back to our reliance on fossil fuels and regulation. Whether it’s oil, coal, or even natural gas, there are inherent risks in extracting these fuels from the earth and dangerous, toxic emissions that come from burning them. To date, no one has been killed in a “wind spill” or “solar spill.” We ultimately need less of the fossil fuel resources, no matter their source, and more renewables. Oftentimes small government advocates and conservatives warn against regulation because of the cost it can create. We never advocate for regulation merely for the sake of regulation, but we NEED smart regulation that places a premium on human life and quality of life over the search for more corporate profits. All of these stories have this theme in common: common sense regulation through a smart regulatory agency, which is something we have lacked from TCEQ.

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