Oak Ridge Today

Y-12 criticality alarms function properly in tests

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A Nuclear Materials Corporation GA-6 Radiation Detector. (Photo courtesy CNS Y-12)

Nuclear Materials Corporation GA-6 Radiation Detector (Photo courtesy CNS Y-12)

 

Alarms designed to detect a nuclear criticality accident at the Y-12 National Security Complex have been tested, and the systems functioned appropriately and as required, the plant said in November.

Y-12 has had a criticality accident alarm system since 1945. A criticality accident would occur if there were an uncontrolled nuclear chain reaction. It could result in the release of radiation and significant exposures to nearby workers if the area were not immediately evacuated. It’s something that the plant takes steps to avoid. The alarms are designed to alert workers if there is an accident.

A nuclear criticality alarm at the 811-acre plant, which works on nuclear weapons components and stores highly enriched uranium, has been given credit for helping to save lives in a nuclear criticality accident in 1958. In that case, which was the first process criticality accident in the United States, Y-12 employees immediately evacuated when they heard the alarm.

A report published by Consolidated Nuclear Security, a federal contractor, said the basic design and electronic configuration of the older criticality alarm system installed in Y-12’s existing facilities, with the exception of the Highly Enriched Uranium Materials Facility, date back to 1957. The legacy system has received many upgrades since installation, and detector stations have been removed and relocated as enriched uranium operations have evolved, said the report, titled “Qualification of Y-12 Legacy Criticality Accident Alarm System Detectors.” [Read more…]

Updated: DOE to investigate possible weaknesses in nuclear criticality controls at Y-12

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The sign at the main entrance to the Y-12 National Security Complex is pictured above on Sunday, Aug. 6, 2017. (Photo by John Huotari/Oak Ridge Today)

The sign at the main entrance to the Y-12 National Security Complex is pictured above on Sunday, Aug. 6, 2017. (Photo by John Huotari/Oak Ridge Today)

 

Note: This story was updated with a statement from CNS at 11:50 a.m. Nov. 19.

The U.S. Department of Energy has notified Consolidated Nuclear Security that it intends to investigate possible weaknesses in nuclear criticality controls at the Y-12 National Security Complex.

The DOE Office of Enterprise Assessments’ Office of Enforcement notified CNS, which manages and operates Y-12, of its intent to investigate on Tuesday. The Office of Enforcement intends to investigate potential noncompliances with DOE nuclear safety program requirements, according to a summary of the notice published online.

The potential nuclear criticality control weaknesses were identified at Y-12 between May 2017 and May 2018, the notice said.

Nuclear criticality occurs when nuclear fuel is capable of sustaining a fission chain reaction. [Read more…]

Report: Chair of nuclear safety board proposes eliminating it

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Sean Sullivan (Photo credit: DNFSB.gov)

Sean Sullivan (Photo credit: DNFSB.gov)

The chairman of a nuclear safety board that provides recommendations and advice on public health and safety issues at certain federal facilities, including two in Oak Ridge, has proposed eliminating the board, according to an investigative news organization in Washington, D.C.

In its October 19 report, the nonprofit, nonpartisan Center for Public Integrity said it had obtained a June 29 letter from Sean Sullivan, the Republican chair of the Defense Nuclear Facilities Safety Board, to Mick Mulvaney, director of the White House’s Office of Management and Budget.

The center has posted the five-page letter online along with an attached one-page historical summary of the five-member board, which issues weekly reports for U.S. Department of Energy sites that include Oak Ridge National Laboratory and Y-12 National Security Complex, among other activities. In his letter, Sullivan said the board is a “relic of the Cold War-era defense establishment.”

The Defense Nuclear Facilities Safety Board is an independent oversight organization within the executive branch. It was created by Congress in 1988 to provide advice and recommendations to the secretary of energy on public health and safety at the defense nuclear facilities managed by DOE. Those reports are publicly available and posted online, and they have been used by reporters and public interest organizations, among others. The Center for Public Integrity said the DNFSB has helped persuade the federal government to impose tighter safety rules and regulations at most of the eight nuclear weapons sites. [Read more…]