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March 7, 2013
NRC INFORMATION NOTICE 2013-04: SHIELD BUILDING CONCRETE SUBSURFACE LAMINAR CRACKING CAUSED BY MOISTURE INTRUSION AND FREEZING
ADDRESSEES
All holders of an operating license or construction permit for a nuclear power reactor under Title 10 of the Code of Federal Regulations (10 CFR) Part 50, "Domestic Licensing of Production and Utilization Facilities," except those who have permanently ceased operations and have certified that fuel has been permanently removed from the reactor vesse All holders of an operating license for a non-power reactor (research, test reactor, or critical assembly) under 10 CFR Part 50, "Domestic Licensing of Production and Utilization Facilities," except those who have permanently ceased operations. All holders of and applicants for a power reactor early site permit, combined license, standard design certification, standard design approval, or manufacturing license under 10 CFR Part 52, "Licenses, Certifications, and Approvals for Nuclear Power Plants."
PURPOSE
The U.S. Nuclear Regulatory Commission (NRC) is issuing this information notice (IN) to inform addressees of the occurrence of laminar subsurface cracks in the reinforced concrete shield building (SB) of the containment system at the Davis-Besse Nuclear Power Station caused by moisture intrusion and freezin The NRC expects that recipients will review the information for applicability to their facilities and consider actions, as appropriate, to avoid similar problem However, suggestions contained in this IN are not NRC requirements; therefore, no specific action or written response is required. DESCRIPTION OF CIRCUMSTANCES On October, 10 2011, the shield building (SB) of Davis-Besse's containment was cut open to permit removal of the old reactor vessel head and installation of the replacement vessel hea At that time, the licensee discovered subsurface cracking located near the outer rebar mat, which extended to adjacent areas of the SB that have not been modified since original constructio A manual chipping process was applied to the cracked area in an initial attempt to determine the extent of the crack Using this method, crack indications along the vertical edge of the containment access opening essentially disappeared, but a crack at the top horizontal cut for the opening did not disappea The licensee investigated and confirmed, through the use of impulse response (IR) mapping and core boring samples (CBS), that subsurface laminar cracking had occurred along the outer rebar mat in the SB flute shoulder areas and at the top of the SB near the junction with the ML12352A052 IN 2013-04
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- Information Notice 2013-04, Concrete Subsurface Laminar Cracking Caused by Moisture Intrusion and Freezing (7 March 2013, Topic: Nondestructive Examination, Moisture barrier)
- Information Notice 2013-04, Concrete Subsurface Laminar Cracking Caused By Moisture Intrusion and Freezing (7 March 2013)
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- Information Notice 2013-11, Crack-like Indications at Dents/Dings and in the Freespan Region of Thermally Treated Alloy 600 Steam Generator Tubes (3 July 2013)
- Information Notice 2013-11, Official Exhibit - NYS000551-00-BD01 - NRC Information Notice 2013-11: Crack-Like Indication at Dents/Dings and in the Freespan Region of Thermally Treated Alloy 600 Steam Generator Tubes (July 3, 2013) (3 July 2013)
- Information Notice 2013-12, Improperly Sloped Instrument Sensing Lines (3 July 2013)
- Information Notice 2013-13, Rev.1, Deficiencies with Effluent Radiation Monitoring System Instrumentation (15 April 2015, Topic: Offsite Dose Calculation Manual, Process Control Program, Maintenance Rule Program)
- Information Notice 2013-13, Rev.1, Deficiencies With Effluent Radiation Monitoring System Instrumentation (15 April 2015, Topic: Offsite Dose Calculation Manual, Process Control Program)
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- Information Notice 2013-18, Refueling Water Storage Tank Degradation (13 September 2013, Topic: Boric Acid, Aging Management)
- Information Notice 2013-20, Official Exhibit - NYS000538-00-BD01 - NRC Information Notice 2013-20: Steam Generator Channel Head and Tubesheet Degradation (October 3, 2013) (ML13204A143) (3 October 2013, Topic: Boric Acid)
- Information Notice 2013-20, OFFICIAL EXHIBIT - NYS000538-00-BD01 - NRC Information Notice 2013-20: Steam Generator Channel Head and Tubesheet Degradation (October 3, 2013) (ML13204A143) (3 October 2013, Topic: Boric Acid)
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