NRC Seeks Information on Protecting Safety Systems from Gas Accumulation

Nuclear Regulatory Commission (NRC) staff has asked all U.S. nuclear power plant operators for information on how they protect certain safety systems from buildup of air, nitrogen or other gases that could cause the systems to malfunction.

Pockets of gas can damage the pipes, valves and pumps that transport water during a reactor emergency. NRC regulations require plant operators to prevent gases from accumulating beyond the point where safety systems could be compromised.

"U.S. plants are operating safely, but we've seen a steady recurrence of gas accumulation affecting safety systems over the past 10 years," said Bill Ruland, director of the Division of Safety Systems in the NRC's Office of Nuclear Reactor Regulation. "We're asking the plants to describe and verify what they've been doing to meet our regulations, and we'll examine their answers to see if we need to take more action."

The NRC's "Generic Letter" asks plant operators to evaluate three basic system types -- emergency core cooling, decay heat removal, and containment spray -- to determine how their design, testing and corrective action programs address gas buildup. The agency asks plant operators to provide three types of information from the evaluations:

1. The overall results of the evaluations, in sufficient detail to demonstrate how the plant meets all applicable NRC regulations.

2. A description of all corrective actions the plant operator found necessary to meet the regulations.

3. A statement including a list of all completed corrective actions, a schedule for any remaining actions, and the basis for why that schedule is acceptable.

Licensees have nine months to respond. If a plant operator feels it cannot meet this date, the operator has three months to describe the actions it will take and why it believes those actions are acceptable. A draft letter was published for comment in the Federal Register, and responses to public comments have been incorporated into the final document.

The letter will be available at http://www.nrc.gov.

Download Center

HTML - No Current Item Deck
  • Green Quadrant EHS Software 2021

    Reserve your copy of the new report by independent analyst firm, Verdantix, to get a detailed, fact-based comparison of the 22 most prominent EHS software vendors in the industry.

  • Best Practices to Navigate ISO 45001

    Learn helpful tips and tricks to navigate your transition to ISO 45001 certification and ensure an effective health and safety management system.

  • Improve Your Safety Culture

    Learn the 3 fundamental areas to focus on to achieve safety culture excellence and what you can do to boost employee engagement in your EHS programs.

  • Chemical Safety: 5 Questions Answered by Experts

    Get answers to 5 of the most frequently asked questions about how to effectively mitigate chemical risk, get the most value out of your chemical data, and gain buy-in for a chemical management technology program.

  • How Has COVID-19 Changed Safety Culture?

    The COVID-19 pandemic has provided unique opportunities for health and safety professionals to rethink how they manage risk and develop stronger safety cultures. Read this eBook to learn actionable steps you can implement today to improve your programs.

  • Industry Safe

OH&S Digital Edition

  • OHS Magazine Digital Edition - January February 2021

    January February 2021

    Featuring:

    • TRAINING: SOFTWARE
      Tips for Choosing the Best Training Software
    • COMBUSTIBLE DUST
      Assessing the Dangers of Dust Explosions
    • HAND PROTECTION
      Pushing the Boundaries of Hand Protection
    • FOOT PROTECTION
      Getting a Grip on Slip Resistance
    View This Issue