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Nuclear Power02:36

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Steam generator hand hole shielding.

W E Cox1

  • 1Seabrook Station, Health Physics Department, NH 03874, USA. coxwx@naesco.com

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|April 19, 2000
PubMed
Summary
This summary is machine-generated.

A new shielding concept for nuclear power plants significantly reduces radiation exposure during steam generator maintenance. This innovation helps maintain personnel radiation dose levels As Low As Reasonably Achievable (ALARA).

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Area of Science:

  • Nuclear Engineering
  • Radiation Protection

Background:

  • Pressurized Water Reactor (PWR) operators face increasing radiation dose from steam generator maintenance.
  • Preventative maintenance, particularly through secondary side hand holes, is performed without water shielding, increasing exposure.
  • Rising work scope for steam generator cleaning and inspection elevates personnel radiation dose.

Purpose of the Study:

  • To develop an effective shielding concept for steam generator secondary side maintenance.
  • To reduce personnel radiation dose during maintenance activities at Seabrook Station.
  • To support the station's goal of maintaining radiation dose ALARA.

Main Methods:

  • Development of a novel shielding concept for steam generator secondary side access ports.
  • Deployment of the shielding during maintenance activities.
  • Estimation of radiation dose savings.

Main Results:

  • The shielding concept demonstrated significant dose savings upon initial deployment.
  • An estimated 2.5 person-rem (25 person-Sv) was saved during the first use.
  • Projected savings of 50 person-rem (500 person-Sv) over the plant's remaining life.

Conclusions:

  • The developed shielding concept is effective in reducing radiation exposure during steam generator maintenance.
  • This innovation contributes to ALARA goals in nuclear power plant operations.
  • The shielding provides substantial long-term radiation dose savings for personnel.