Month: September 2016

Baffle Bolts: An Update

Neil Sheehan
Public Affairs Officer
Region I

There have been some new developments since our last blog post, on June 1, regarding degraded reactor vessel bolts identified at a pair of nuclear power plants in the Northeast. Most notably, both the Indian Point 2 plant, in New York, and the Salem 1 plant, in New Jersey, returned to service over the summer.

BaffleBoltsGraphic1_cleanbigfontIndian Point 2 came back online in late June after 278 of the plant’s 832 baffle-former bolts were replaced. As for Salem 1, it was restarted on July 30th after changing out 189 of its 832 baffle-former bolts.

In both cases, prior to the restarts, the NRC conducted independent evaluations of analyses done for the plants’ respective owners by the reactor vendors looking at how many new, more robust bolts had to be installed to maintain safety margins and ensure the structural integrity of the baffle-former plates. The agency also had specialist inspectors at the plants for first-hand observations and information-gathering on bolt-removal and -replacement activities.

Based on those reviews, the NRC concluded that the reactors were safe to operate. The bolts will be subject to further inspections at the reactors’ next refueling outages, which typically occur about once every 18 to 24 months.

Nevertheless, the NRC identified a “green” (very low safety significance) non-cited violation at Indian Point 3 related to the bolts issue in an inspection report issued on Aug. 30th. A similar non-cited violation has also been identified at the Salem nuclear power plant, as documented in an NRC inspection report issued on Sept. 22.

In both cases, the plant owners had not completed a necessary process to document its conclusion, following identification of degraded bolts on one unit, that the second unit was safe to continue to operate. After the NRC raised concerns regarding the deficiencies, the companies undertook corrective actions, including completing and documenting the evaluations.

Looking ahead, there is still more work to be done. Bolts from both reactors have been or will be sent to labs for metallurgical analysis. Also, the NRC will continue to engage the nuclear industry on its plans for addressing the issue

An NRC web page has been updated to reflect the latest available information on this topic, including the NRC slides from a related July meeting and a summary of the session.

Radium Part II: Trying to Close Pandora’s Box

Tom Wellock
NRC Historian

Until 1945, radium was the best known radioactive material. It was widely found in consumer and medical products. And, as we saw in Part I of this series, it became notorious for fatally sickening radium watch-dial painters in the 1920s. With few exceptions, oversight of public and workplace safety for radium was mostly a state responsibility, and the federal government’s role was limited to such issues as preventing false advertising and regulating mail shipments.

USRadiumGirls-Argonne1ca1922-23-150dpiAt that time, radioisotopes came from just two limited sources. They were painstakingly isolated from natural ores, as was radium, or created in small batches in particle accelerators. These accelerators fire beams of electrons, protons and other particles at elements to create radioactive isotopes. Today the products of these two processes are called NARM—short for Naturally-Occurring and Accelerator-Produced Radioactive Material.

Scientists working on fission and the Manhattan Project discovered new radioactive isotopes with interesting properties. They soon became widely available to scientists, who found many uses for these products, from medical to basic research. They were under federal control and soon eclipsed the small amounts of radium and other NARM that existed before the war. Cold-War security concerns demanded federal control of nuclear technology and this new radioactive material.

Still, the 1946 Atomic Energy Act avoided intruding on state authority over NARM. It focused the Atomic Energy Commission’s oversight on fissionable material such as uranium and thorium and reactor-produced isotopes. The AEC controlled the vast majority of radioactive material.

This division of power didn’t disturb existing state authority but made little technical sense. An isotope produced in a reactor would be identical to one found in nature or produced in an accelerator.  Moreover, state oversight was uneven.

Radium_Periodic Element TableRadium had lost its luster and fallen into disuse. Safer reactor-produced isotopes and sources with shorter half-lives mostly replaced radium for medical uses. Radium consumer products disappeared from stores by the 1970s. But products made with radium during its heyday (see Part I) retain their hazard for a long time.

So, from time to time, reports would emerge of products found in someone’s attic or office, or contamination found in a building. This prompted the Public Health Service to launch a program to collect and safely dispose of old radium sources.

Beginning in the late 1960s, state radiation control officers called for legislation to give the AEC and later the NRC the power to regulate radium and other NARM. In 1985 the NRC asked to be given authority over NARM waste disposal, but Congress took no action. The status quo remained, in part due to difficulties Congress had deciding on the federal agency best suited to regulate radium and oversee cleanup.

Little changed until the 1990s when terrorism provided a new dimension of concern. Experts worried that untracked or stolen radioactive sources, including radium, could be used in “dirty bombs.” Between 1998 and 2003, as part of the U.S. delegation to the International Atomic Energy Agency, the NRC worked with member nations on a code of conduct for radioactive sources. To limit the potential for “malicious acts,” the code appealed to each country to develop a national system of regulation for a list of radioactive sources — radium among them.

In the wake of 9/11, support for the IAEA code gained momentum. Congress included a provision in the 2005 Energy Policy Act giving NRC oversight of radium and other sources of NARM. A consensus for federal regulation emerged only when national security issues joined long-standing health concerns.