Southern California breaking news and trends

San Onofre nuclear plant not allowed to reopen pending fixes, say feds

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Citing critical concerns about equipment failure, the U.S. Nuclear Regulatory Commission (NRC) has barred SoCal Edison from restarting the San Onofre nuclear plant at this time, the L.A. Times reports.

Trouble at San Onofre has been ongoing since January's radioactive steam leak, and the commission has been trying to determine why tubes carrying hot, pressurized, radioactive water inside the steam generators are deteriorating at a dangerous and unusual rate

On Tuesday, the cause of the tube trouble was addressed in a letter federal regulators sent to Edison.

Officials said the wear in both Unit 2 and Unit 3 was caused by vibrating tubes rubbing against each other. Additionally in Unit 3, the tubes were rubbing against support structures, according to the NRC. It was still unclear why it was happening.

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San Onofre reactors down indefinitely, power shortages possible this summer

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Like the forthcoming tans of a rapidly approaching summer, hopes are fading that the San Onofre Nuclear Generating Station will be functional by the time peak summer usage rears its sweaty head.

With San Onofre's nuclear reactors offline indefinitely -- Unit 3 was shut down following January's radioactive leak and Unit 2 is offline for maintenance -- local agencies are scrambling to strategize a way of handling the upcoming summer demand to avoid shortages or blackouts.

Preliminary plans were discussed Thursday at a meeting to address the power supply issue.

State regulators may need to bring in electric generators via barges, or un-retire closed power plants to make up for lost electricity. Officials at the California Independent System Operator meeting said an extended heatwave or surge in usage may still cause outages.

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San Onofre can't take the pressure, tubes fail test

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It does not take a nuclear physicist to understand the troubling situation at the San Onofre Nuclear Generating Station. 

Three tubes failed to pass a pressure test this week, prompting the U.S. Nuclear Regulatory Commission (NRC) to send an inspection team to San Diego County.

The tubes, which move radioactive water through a steam generator, have been under scrutiny after unusual deterioration was found following a small radioactive gas leak in January. 

NRC officials explained the relatively obvious in a statement, by noting that the tubes that failed are more likely to rupture during plant events affecting pressure in the generator. 

It goes on to say that tube integrity is important because "the tubes provide an added barrier inside the containment building to prevent a radioactive steam release."

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NRC requiring modifications to every U.S. nuclear power plant

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U.S. nuclear power plants have until the end of 2016 to comply with new safety recommendations released Friday by the Nuclear Regulatory Commission. 

Plants were ordered to begin immediately implementing the upgrades in an effort to prevent a large-scale radioactive crisis like what occurred last year at Japan's Fukushima Daiichi nuclear power plant following the earthquake and tsunami.

Recommendations were laid out in a three-part plan. Two points apply to every U.S. commercial nuclear power plant, including those under construction and recently licensed new Vogtle reactors. One point only concerns a specific type of containment structure, said the NRC in a press release.

  • The first Order requires the plants to better protect safety equipment installed after the 9/11 terrorist attacks and to obtain sufficient equipment to support all reactors at a given site simultaneously.
  • The second Order requires the plants to install enhanced equipment for monitoring water levels in each plant’s spent fuel pool.
  • The third Order applies only to U.S. boiling-water reactors that have “Mark I” or “Mark II” containment structures. These reactors must improve venting systems (or for the Mark II plants, install new systems) that help prevent or mitigate core damage in the event of a serious accident.

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San Onofre reactor still down one week later

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One week after a radiation leak prompted a shut down at San Onofre, the nuclear plant's Unit 3 reactor remains offline. 

The reactor was finally cool enough on Monday for workers to install inspection equipment, but it was unclear how long the unit would remain out of service, according to plant operator Southern California Edison and officials at the Nuclear Regulatory Commission, reports U-T San Diego

During an inspection, unusual wear was found on hundreds of steam generator tubes pumping radioactive water in Unit 2, however that reactor is still in service. The NRC said tubes showed excessive wear. Edison called the findings preliminary.

Over the past two years, generators in both reactors were replaced with $670 million worth of new equipment manufactured in Japan by Mitsubishi Heavy Industries.

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