ML120340141
| ML120340141 | |
| Person / Time | |
|---|---|
| Issue date: | 02/08/2012 |
| From: | Stewart Bailey Safety Issues Resolution Branch |
| To: | Butler J Nuclear Energy Institute |
| beall j | |
| References | |
| Download: ML120340141 (2) | |
Text
February 8, 2012 John Butler, Senior Director Engineering and Operations Nuclear Energy Institute 1776 I Street NW, Suite 400 Washington, DC 20006-3708
SUBJECT:
GSI - 191 DOSE ESTIMATES
Dear Mr. Butler:
Per our telephone discussion on January 30, 2012, I am requesting your assistance in gathering updated information on occupational radiation exposures that have been, or would be, incurred during insulation removal modifications associated with Generic Safety Issue (GSI) -191. The Nuclear Regulatory Commission (NRC) staff would use this information as part of its response to the Commissions Staff Requirements Memorandum (SRM) of SECY-10-0113.
Since the issuance of that SRM on December 23, 2010, the nuclear industry has advanced its understanding of risk-informed evaluations of GSI-191, zone of influence for various materials, methods of reducing the zone of influence (e.g., banding), and in-vessel effects. All of these have the potential to affect the scope of plant modifications, including insulation removal, needed to address GSI-191. Any information you have regarding the impacts of these items would also be appreciated.
I appreciate your offer to help collect more current information.
Sincerely,
/RA/
Stewart N. Bailey, Chief Safety Issue Resolution Branch Division of Safety Systems Office of Nuclear Reactor Regulation
February 8, 2012 John Butler, Senior Director Engineering and Operations Nuclear Energy Institute 1776 I Street NW, Suite 400 Washington, DC 20006-3708
SUBJECT:
GSI - 191 DOSE ESTIMATES
Dear Mr. Butler:
Per our telephone discussion on January 30, 2012, I am requesting your assistance in gathering updated information on occupational radiation exposures that have been, or would be, incurred during insulation removal modifications associated with Generic Safety Issue (GSI) -191. The Nuclear Regulatory Commission (NRC) staff would use this information as part of its response to the Commissions Staff Requirements Memorandum (SRM) of SECY-10-0113.
Since the issuance of that SRM on December 23, 2010, the nuclear industry has advanced its understanding of risk-informed evaluations of GSI-191, zone of influence for various materials, methods of reducing the zone of influence (e.g., banding), and in-vessel effects. All of these have the potential to affect the scope of plant modifications, including insulation removal, needed to address GSI-191. Any information you have regarding the impacts of these items would also be appreciated.
I appreciate your offer to help collect more current information.
Sincerely,
/RA/
Stewart N. Bailey, Chief Safety Issue Resolution Branch Division of Safety Systems Office of Nuclear Reactor Regulation DISTRIBUTION:
PUBLIC SSIB/rf JBeall SBailey SStuchell JDavis WRuland Accession: ML120340141 OFFICE NRR/DSS/SSIB NRR/DSS/SSIB NRR/DSS NRR/DSS NAME JBeall SBailey JDavis WRuland DATE 2/06/12 2/13/12 2/08/12 2/08/12 OFFICIAL RECORD COPY