paloverde


Empty Pipe Dreams at Palo Verde

, director, Nuclear Safety Project

Regulation and Nuclear Plant Safety #3

In July 2004, Nuclear Regulatory Commission (NRC) inspectors at the Waterford nuclear plant in Louisiana discovered that a portion of piping in a standby emergency system that would provide makeup water to cool the reactor in event of an emergency had been kept emptied of water, jeopardizing the ability to prevent core damage. This finding was shared with owners of similar reactors across the country. Days later, workers at the Palo Verde nuclear plant in Arizona discovered that sections of the emergency system piping for all three reactors was being deliberately emptied of water. Read more >

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NRC’s Decision Making: 18 Reasons Why You Are Right, but Wrong

, director, Nuclear Safety Project

As described in a prior blog post, the Unit 3 reactor at the Palo Verde Generating Station had one of two emergency diesel generators (EDGs) explode during a test run. The license issued by the Nuclear Regulatory Commission (NRC) allowed the reactor to remain running for up to 10 days with one EDG unavailable. Fixing the heavily damaged EDG would require far longer than 10 days, so the plant’s owner submitted requests to the NRC for its permission to run the reactor for up to 21 days and then up to 62 days with only one EDG available. Read more >

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Nuclear Regulatory Commission: Contradictory Decisions Undermine Nuclear Safety

, director, Nuclear Safety Project

As described in a recent All Things Nuclear commentary, one of the two emergency diesel generators (EDGs) for the Unit 3 reactor at the Palo Verde Nuclear Generation Station in Arizona was severely damaged during a test run on December 15, 2016. The operating license issued by the Nuclear Regulatory Commission (NRC) allowed the reactor to continue running for up to 10 days with one EDG out of service. Because the extensive damage required far longer than the 10 days provided in the operating license to repair, the owner asked the NRC for permission to continue operating Unit 3 for up to 62 days with only one EDG available. The NRC approved that request on January 4, 2017.

The NRC’s approval contradicted four other agency decisions on virtually the same issue. Read more >

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Nuclear Leaks: The Back Story the NRC Doesn’t Want You to Know about Palo Verde

, director, Nuclear Safety Project

As described in a recent All Things Nuclear commentary, one of two emergency diesel generators (EDGs) for the Unit 3 reactor at the Palo Verde Nuclear Generation Station in Arizona was severely damaged during a test run on December 15, 2016. The operating license issued by the Nuclear Regulatory Commission (NRC) allowed the reactor to continue running for up to 10 days with one EDG out of service. Because the extensive damage required far longer than 10 days to repair, the owner asked the NRC for permission to continue operating Unit 3 for up to 62 days with only one EDG available. The NRC approved that request. Read more >

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Palo Verde: Running Without a Backup Power Supply

, director, Nuclear Safety Project

The Arizona Public Service Company’s Palo Verde Generating Station about 60 miles west of Phoenix has three Combustion Engineering pressurized water reactors that began operating in the mid 1980s. In the early morning hours of Thursday, December 15, 2016, workers started one of two emergency diesel generators (EDGs) on the Unit 3 reactor for a routine test. The EDGs are the third tier of electrical power to emergency equipment for Unit 3. Read more >

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