Office for Nuclear Regulation

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Steam Generator Tube Rupture

Information released

You asked us to provide a copy of the most recent (versions) of the following:

  1. Steam Generator Tube Rupture Mitigation Strategy. PEPR-F DC 38 Revision A. Areva. December 2010. TRIM Ref. 2011/86029.
  2. Single Tube Steam Generator Tube Rupture Analysis for the UK EPR. PEPR-F.10.1665. Areva. December 2010. TRIM Ref. 2011/86031.
  3. Multiple Steam Generator Tube Rupture (10 Tubes in One Steam Generator at Power). NEPR-F DC 564 Revision A. Areva. February 2010. TRIM Ref. 2011/91656.
  4. Steam Generator Tube Rupture Mitigation Strategy. PEPR-F DC 38 Revision A. AREVA. December 2010.
    TRIM Ref. 2011/86029.
  5. EPR UK GDA GDA Issue FS04 Update of Single Tube Steam Generator Tube
    Rupture Analysis for the UK EPR. PEPR-F.10.1665. Rev. 2, AREVA, September 2011.
    TRIM Ref. 2011/494066.
  6. EPR UK GDA GDA Issue FS04 Single Tube Steam Generator Tube Rupture
    Analysis for the UK EPR. PEPR-F.10.1665. Rev. 3, AREVA, September 2012.
    TRIM Ref. 2012/369370.

And you ask that our response references your itemisation above.

Our response is as follows:

  1. The latest version of this documents is Revision D
  2. The latest version of this documents is Revision 3
  3. The latest version of this documents is Revision A
  4. The latest version of this documents is Revision D
  5. The latest version of this documents is Revision 3
  6. The latest version of this documents is Revision 3

There are therefore three documents attached, as the response to items 1 and 4 is the same document, and the response to items 2, 5 and 6 is the same document.

Exemptions applied

Some information in these documents is being withheld as it falls under the exceptions in Regulation 13 - Personal Data.

Also some information is being withheld under Regulation 12(5)(e) - The confidentiality of commercial or industrial information where such confidentiality is provided by law to protect a legitimate economic interest

This is a qualified exemption and subject to a public interest test. This means that ONR needs to balance the public interest factors favouring disclosure against those favouring non-disclosure.

PIT (Public Interest Test) if applicable

Factors for disclosure

Issues related to the nuclear industry are subject to close scrutiny and debate, there is public interest in information related to nuclear activities and the release of such information.

Factors for withholding

The disclosure of commercially sensitive information would prejudice the commercial interests of an individual or body.

Conclusion

On balance, it is not in the public interest for the release of commercial information in this case.