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Wed, 2011-06-15 14:51 — mdmcdonald
The Nuclear and Radiation working group is focused on exploring the best practices for addressing nuclear and radiation events.

The mission of the "Nuclear and Radiation" working group is to explore and build best practices for addressing nuclear and radiation events.

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Faulty Computer Modeling Caused San Onofre Nuke Equipment Problems

Thu, 2012-06-21 18:21 — Kathy Gilbeaux

      

Kaili Richards, 6, of San Diego holds up a homemade sign during a nuclear watchdog group's news conference before the Nuclear Regulatory Commission's meeting in San Juan Capistrano. The activists are against the restarting of the San Onofre nuclear plant. (Allen J. Schaben, Los Angeles…)

latimes.com - by Abby Sewell - June 19, 2012

NRC officials give their first public account of their probe into the shuttered plant's problems.

Faulty computer modeling caused the equipment problems that are expected to keep the San Onofre nuclear plant dark through the summer, federal regulators said Monday.

Officials from the U.S. Nuclear Regulatory Commission gave their first public account of the initial findings of their investigation into the plant's problems at a meeting in San Juan Capistrano.

What they did not give was any indication of how long the plant is likely to remain out of service, saying there are still questions plant operator Southern California Edison needs to answer and more inspections the NRC must do.

(READ COMPLETE ARTICLE)

California Nuclear Plant Shut Indefinitely Amid Hunt to Find Cause of Problems

Sat, 2012-04-07 11:18 — Kathy Gilbeaux

submitted by Janine Rees

      

The power plant has been shut down since this winter, when a small amount of radioactive gas escaped.

CNN - April 6, 2012
STORY HIGHLIGHTS
  • Anti-nuclear activists warn of a potential environmental catastrophe
  • The San Onofre nuclear plant has been shut down since radioactive gas escaped
  • Officials have said there's no harm to the public health, but can't identify problem's cause
  • The head of the NRC says the plant won't restart until a cause and plan is put forward

(CNN) -- A large Southern California nuclear plant is out of commission indefinitely, and will remain so until there is an understanding of what caused problems at two of its generators and an effective plan to address the issues, the nation's top nuclear regulator said Friday.

(READ COMPLETE ARTICLE)

Canopy-Forming Kelps as California’s Coastal Dosimeter: 131I from Damaged Japanese Reactor Measured in Macrocystis Pyrifera

Sun, 2012-04-01 01:06 — Kathy Gilbeaux

                             This study indicates Kelp could act as a coastal dosimeter for California.              

                   

The Fukushima Daiichi Nuclear Plant, damaged by an earthquake and tsunami on March 11, 2011 released large amounts of 131I into the atmosphere, which was assimilated into canopy blades of Macrocystis pyrifera sampled from coastal California. The specific activity calculated to the estimated date of deposition/assimilation ranged from 0.6 to 2.5 Bq gdwt–1, levels greater than those measured from kelps from Japan and Canada prior to the release. These 131I levels represent a significant input into the kelp forest ecosystem. Canopy-forming kelps are a natural coastal dosimeter that can measure the exposure of the coastal environment to 131I and perhaps other radioisotopes released from nuclear accidents. An organizational mechanism should be in place to ensure that they are sampled immediately and continuously after such releases.

Cracked Steam Generator Tubes at San Onofre

Sat, 2012-03-31 01:33 — Kathy Gilbeaux

by Dave Lochbaum - allthingsnuclear.org - March 27, 2012

Leaks in San Onofre Unit 3 and Unit 2:

On February 18, 2011, operators restarted the Unit 3 pressurized water reactor (PWR) at the San Onofre nuclear plant in southern California following its sixteenth refueling outage. During the outage, workers replaced both of the reactor’s steam generators, which are large cylindrical containers that are partially filled with water.

At 3:05 pm on January 31, 2012 – less than a year later – radiation alarms alerted the control room operators that water was leaking through one or more of the tubes in one of the steam generators on Unit 3. They estimated the leak rate to be 82 gallons per day.

(READ COMPLETE ARTICLE)

Fukushima Reactor Water Level Shallower Than Thought

Fri, 2012-03-30 17:47 — Kathy Gilbeaux

yomiuri.co.jp - March 28, 2012

The water level in the containment vessel of the No. 2 reactor at the Fukushima No. 1 nuclear power plant is only about 60 centimeters deep, far shallower than previously assumed levels of about four meters, according to Tokyo Electric Power Co.

The lower-than-expected water level was discovered for the first time when the power utility used an industrial endoscope to check the crippled reactor's interior on Monday, TEPCO said.

According to some experts, it is possible that nuclear fuel that melted through the reactor's pressure vessel and accumulated on the bottom of the containment vessel in the aftermath of the March 11 earthquake and tsunami may not be completely covered in the water.

TEPCO said the water temperature in the vessel remained relatively low within a range of 48.5 C to 50 C. The discovery of the unexpectedly shallow water level will not affect TEPCO's judgment that the reactor is in a state of "cold shutdown."

http://www.yomiuri.co.jp/dy/national/T120327006202.htm

Molecule May Aid Nuclear Waste Clean-Up

Thu, 2012-03-15 11:25 — Kathy Gilbeaux

Molecules cause radioactive waste to cluster, facilitating cleanup // Source: kokokuxhito.info

submitted by Luis Kun

Homeland Security News Wire - March 14, 2012

Scientists have produced a previously unseen uranium molecule in a move that could improve clean-up of nuclear waste.

The distinctive butterfly-shaped compound is similar to radioactive molecules that scientists had proposed to be key components of nuclear waste. These molecules, however, were thought too unstable to exist for long.

A University of Edinburgh release reports that researchers have shown the compound to be robust, which implies that molecules with a similar structure may be present in radioactive waste.

University of Edinburgh scientists, who carried out the study, say their findings suggest the molecule may play a role in forming clusters of radioactive material in waste.

These are difficult to separate during clean-up. Improving treatment processes for nuclear waste, including targeting this type of molecule, could help the nuclear industry move towards cleaner power generation.

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Tighter Regulation of Industry’s Disaster Preparedness Required

Tue, 2012-03-13 23:35 — Kathy Gilbeaux

submitted by Samuel Bendett

Homeland Security News Wire - March 13, 2012

Before 11 March 2011, Japan was held up as a paragon for preparedness; they had a national readiness plan, regular disaster drills, and strong civic engagement; the Fukushima disaster exposed a disturbing reality: search and rescue efforts were delayed, shelters ill-equipped, and supply chains broken; worst of all, there was confusion about who was managing the nuclear accident — the power company TEPCO or the Japanese government; information, when forthcoming, was sometimes contradictory

Sunday marked the 1-year anniversary of the Fukushima disaster, and experts at the Mailman School of Public Health at Columbia University took stock of disaster response, nuclear fears, and lessons learned.

Before 11 March 2011, Japan was held up as a paragon for preparedness. They had a national readiness plan, regular disaster drills, and strong civic engagement. In the face of an unprecedented 9.0 earthquake, massive tsunami, and a nuclear accident at the Fukushima-Daiichi power plant, however, the country experienced a host of challenges — many that continue to be felt.

Fukushima Lesson: Be Ready for Unanticipated Nuclear Accidents

Mon, 2012-03-12 21:49 — Kathy Gilbeaux

submitted by Samuel Bendett

Homeland Security News Wire - March 12, 2012

A year after the Fukushima disaster all but two of Japan’s fifty-four nuclear reactors remain shut down, in a country where nuclear power once supplied nearly 30 percent of the electricity; the Japanese government is awarding an initial $13 billion in contracts to begin decontamination and rehabilitation of the more than 8,000-square-mile region most exposed to radioactive fallout

A year after the crisis at Japan’s Fukushima Daiichi nuclear power plant, scientists and engineers remain largely in the dark when it comes to fundamental knowledge about how nuclear fuels behave under extreme conditions, according to a University of Michigan nuclear waste expert and his colleagues.

In a review article in this week’s edition of the journal Science, U-M’s Rodney Ewing and two colleagues call for an ambitious, long-term national research program to study how nuclear fuels behave under the extreme conditions present during core-melt events like those that occurred at Fukushima following the 11 March, 2011, magnitude 9.0 earthquake and tsunami.

The Future of Nuclear Energy

Fri, 2012-03-09 22:30 — Kathy Gilbeaux

submitted by Samuel Bendett

Homeland Security News Wire - March 9, 2012

While the lessons of the 11 March 2011 Fukushima disaster are being absorbed, the United States is moving forward with nuclear power; for the first time since 1978, the U.S. National Regulatory Commission has approved two new plants; the $14 billion facilities will be built just outside Augusta, Georgia

Last March, the world watched closely as Japan struggled to contain a series of equipment failures, hydrogen explosions, and releases of radioactive materials at the Fukushima Daiichi Nuclear Power Plant.

The historic tsunami following the 9.0-magnitude earthquake destroyed the reactors’ connection to the power grid, causing them to overheat. Hundreds of people were exposed to increased levels of radiation. Thousands more were evacuated. Japanese officials have since declared the plant stable, but the cleanup will be expensive and is expected to take decades.

New NRC Hazard Analysis Earthquake Study Released

Tue, 2012-01-31 23:32 — Kathy Gilbeaux

submitted by Kay Goss

                 

US NRC study released today on "New Seismic Model Will Refine Hazard Analysis at U.S. Nuclear Plants" and performs studies at many central and eastern U.S. susceptible locations. The Central and Eastern United States Seismic Source Characterization for Nuclear Facilities (CEUS SSC) Project was conducted from April 2008 to December 2011 to develop a new, regional seismic source model for use in conducting and reviewing probabilistic seismic hazard analyses (PSHAs) for nuclear facilities in the CEUS. PSHA is a method for assessing site-specific seismic hazard that includes getting the best estimate of ground motions and a transparent quantitative accounting of uncertainty. The results of PSHA are used in seismic design and in calculating seismic risk. 

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Earthquake
Radiation
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