THREE MILE ISLAND NUCLEAR STATION, UNIT 1 - SUMMARY OF CONFERENCE CALLS WITH EXELON GENERATION COMPANY, LLC TO DISCUSS 2011 STEAM GENERATOR TUBE INSPECTIONS (TAC NO. ME7229)
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Monday, January 16, 2012
The Fukushima black box
From The Economist:
There is a breathtaking serenity to the valley that winds from the town of Namie, on the coast of Fukushima prefecture, into the hills above. A narrow road runs by a river that passes through steep ravines, studded with maples. Lovely it may be, but it is the last place where you would want to see an exodus of 8,000 people fleeing meltdowns at a nearby nuclear-power plant.Along that switchback road the day after the earthquake and tsunami on March 11th 2011, it took Namie’s residents more than three hours to drive 30km (19 miles) to what they thought was the relative safety of Tsushima, a secluded hamlet. What they did not know was that they were heading into an invisible fog of radioactive matter that has made this one of the worst radiation hotspots in Japan—far worse than the town they abandoned, just ten minutes’ drive from the gates of the Fukushima Dai-ichi plant. It was not until a New York Times report in August that many of the evacuees realised they had been exposed to such a danger, thanks to government neglect.
New York State Wins Review of Nuclear Plant Accident Plans
From Environment News Service:
In the context of Indian Point's relicensing, the attorney general's office argued that the NRC has the obligation to require Entergy to complete analyses of cost-beneficial measures, or to require that the measures be adopted - consistent with NRC's own regulations, as well as those of the National Environmental Policy Act and the Administrative Procedure Act. On July 15, the Atomic Safety and Licensing Board issued a decision, agreeing with the attorney general that Indian Point cannot be relicensed without completing the legally-required analyses of its severe accident mitigation measures. Now, Schneiderman says, the Nuclear Regulatory Commission must require Indian Point's owner, Entergy, to either adopt cost-effective upgrades that would improve responses and control the impact of a severe accident, or provide a compelling reason why it will not do so.
New York State Wins Review of Nuclear Plant Accident Plans
From Environment News Serivce:
In the context of Indian Point's relicensing, the attorney general's office argued that the NRC has the obligation to require Entergy to complete analyses of cost-beneficial measures, or to require that the measures be adopted - consistent with NRC's own regulations, as well as those of the National Environmental Policy Act and the Administrative Procedure Act. On July 15, the Atomic Safety and Licensing Board issued a decision, agreeing with the attorney general that Indian Point cannot be relicensed without completing the legally-required analyses of its severe accident mitigation measures. Now, Schneiderman says, the Nuclear Regulatory Commission must require Indian Point's owner, Entergy, to either adopt cost-effective upgrades that would improve responses and control the impact of a severe accident, or provide a compelling reason why it will not do so.
Peach Bottom takes 15 years to identify transformer problem
Franklin Delano Roosevelt, before he died, said that December 7th would live in infamy.
He certainly won't say the same about December 15th, since he's dead, but if he weren't he might.
Attached are two licensee event reports both dated December 15, 2011.
One is for Peach Bottom in Pennsylvania and the other is for Perry in Ohio. Both involve violations of federal safety regulations (Criterion 17 in Appendix A to 10 CFR Part 50) requiring two or more connections between a nuclear power plant and its offsite electrical grid. Both times, there were one or fewer connections.
On October 18, 2011, Perry was preparing to restart from an outage. At 12:12 am (way early in the morning), workers performed a surveillance test to verify that two or more connections to the offsite power grid were available and operable. At 4:19 pm that afternoon with the reactor being started up, workers found that one of the required offsite power connections had been disconnected and Danger tags hung. Workers fixed that illegal configuration within an hour or so.
On November 16, 2011, workers at Peach Bottom belatedly figured out that a modification installed at the plant in the mid-1990s to "upgrade the reliability of the offsite sources" actually failed to do so due to "an inadequate design of the auxiliary power" to the new transformer. Basically, that new transformer used the same auxiliary power source as another transformer, such that failure of that auxiliary power source disabled both transformers. [The transformers in questions were connections between the offsite electrical grid and the plant --- they increased the voltage of outgoing electricity to that of the grid and decreased the voltage of incoming voltage to that of the plant.] The LER was submitted because Peach Bottom had counted operability of these two transformers as satisfying the federal safety regulation for two or more offsite power sources, when in fact they were but a single source due to their lack of separation/independence.
Where's the beef?
Safety studies generally rely on the backup power supply from onsite emergency diesel generators and take little credit for the normal power provided by the electrical grid. But there's a caveat --- the reliability of the offsite electrical grid is a factor in the safety studies. The less reliable the offsite grid, the more reliability the emergency diesel generators must be. Also, the now well-known station blackout event (e.g., the Fukushima script) ends when either an onsite emergency diesel generator is recovered or offsite electrical power is restored. Having two or more connections to the offsite power grid BEFORE the station blackout event is considered in determining how long it'll take to restore one of them.
Once again, U.S. federal safety regulations protect Americans from disasters such as that occurring at Fukushima last March.
Or rather, these regulations would provide that protection if only they were met.
Thanks,
Dave Lochbaum
UCS
Download ML11356A077
Download ML11356A089
NRC Seeks Comment on Extended Storage of Spent Nuclear Fuel
No. 12-001 January 3, 2012 NRC SEEKS PUBLIC COMMENT ON ASSUMPTIONS FOR ENVIRONMENTAL STUDY OF EXTENDED STORAGE OF SPENT NUCLEAR FUEL The Nuclear Regulatory Commission seeks public comment on a report updating preliminary assumptions for an Environmental Impact Statement (EIS) the agency will develop to analyze the effects of storing spent nuclear fuel from the nation’s commercial power reactors for as much as 200 years. The EIS will be part of the agency’s effort to update its Waste Confidence Decision and Rule, last updated in 2010. The report being made available for comment is an early effort to obtain public input about the general scope of the EIS before the NRC formally initiates the EIS “scoping” process. The EIS will include analyses of environmental impacts that are directly related to the long-term handling, storage and transportation of commercial spent fuel and high- level waste. The report discusses several storage scenarios, including at nuclear power plants, regional or centralized storage sites or a combination of storage and reprocessing of spent fuel. A key assumption is that extended storage would be managed under a regulatory program similar to current regulation of spent fuel. To analyze the impacts associated with the scenarios, the staff will develop generic, composite sites for each scenario, and these sites will account for a range of characteristics of actual reactor and storage sites. The report, entitled “Background and Preliminary Assumptions for an Environmental Impact Statement – Long-Term Waste Confidence Update,” was posted Jan. 3 on the NRC website. The report updates assumptions first laid out in SECY-11-0029, dated Feb. 28, 2011. As revised in 2010, the Waste Confidence Decision and Rule included the Commission’s confidence that spent fuel can be safely managed until it undergoes final disposition. At the same time, the Commission directed the staff to prepare a long-term update to the Waste Confidence Decision and Rule that would cover extended storage of spent fuel. This long-term update is to be informed by the analysis and conclusions of the EIS anticipated in the current report. Comments on the report may be filed by email to WCOutreach@nrc.gov or by U.S mail to Christine Pineda, Project Manager, Office of Nuclear Material Safety and Safeguards, Mailstop EBB-2B2, U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001.
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TMI: Summary of Conference Calls with Exelcon (ML113550167)
THREE MILE ISLAND NUCLEAR STATION, UNIT 1 - SUMMARY OF CONFERENCE CALLS WITH EXELON GENERATION COMPANY, LLC TO DISCUSS 2011 STEAM GENERATOR TUBE INSPECTIONS (TAC NO. ME7229)
Download ML113550167
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