Category Archives: Electrical problems

Weird Event Report from Diablo Canyon

On July 10, 2013, the Unit 2 reactor at Diablo Canyon in California shut itself down following a a voltage irregularity from the unit’s diesel generator. According to the report sent to the NRC: The preliminary cause of the differential … Continue reading

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NRC Bulletin warns plants of potential design flaw that could affect electrical systems following loss of offsite power

The Nuclear Regulatory Commission issued a Bulletin today requesting information from all 104 operating commercial nuclear reactors in the United States. According to an NRC press release: The Nuclear Regulatory Commission has issued a Bulletin to all nuclear power plant … Continue reading

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Update: Offsite power restored at Illinois nuke, and NRC begins investigation

The Byron nuclear power plant notified the Nuclear Regulatory Commission that it had restored offsite power to its Unit 2 reactor as of 10 pm yesterday. This means that the reactor was running on power supplied by emergency diesel generators … Continue reading

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Event Report: Update on loss of power incident at Illinois nuke

Today’s NRC Event Reports include the incident yesterday morning at the Byron Unit 2 reactor in Illinois. There are three significant updates.   First, the reactor is still operating on power supplied by the unit’s emergency diesel generators. So, at … Continue reading

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Update: Emergency outage at South Texas nuke enters second week‏

On November 29, the Unit 2 reactor at the South Texas Project experienced an automatic reactor trip from 100 per cent power. The reactor had just returned to full power after a refueling outage. In the shutdown, a steam dump valve … Continue reading

Posted in Electrical problems, Event Reports, Expansion, Hydrogen leak, Loan guarantees, Nuclear Regulatory Commission, Plant shutdowns, Reactor problems, South Texas Project | Tagged , , , , , | Leave a comment

TEPCO probe finds ‘no significant errors’ in meltdown response

In the investigation of the Watergate breakin and coverup, Richard Nixon set a new standard for the minimum amount of acceptance of responsibility, when he acknowledged “Mistakes were made.” Tokyo Electric Power Co. (TEPCO) is not that forthcoming. As the … Continue reading

Posted in Coolant leak, Earthquake, Electrical problems, Explosion, Fire, Flooding, Fukushima, GE Mark I reactor, Hydrogen leak, Loss of offsite power, Meltdown, Plant shutdowns, Radiation leak, Reactor problems, TEPCO, Tsunami | Tagged , , , , | Leave a comment

Event Reports: Bearing failure in Michigan, loss of offsite power in Wisconsin

A couple of items from today’s Nuclear Regulatory Commission Event Reports today: 1. Friday afternoon, operators at the Cook nuclear power plant in Michigan manually started the Unit 1 Auxiliary Feedwater Pumps after one of the pumps suffered a bearing failure. … Continue reading

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