Informal Request for ATI Records Previously Released

Organization: Canadian Nuclear Safety Commission

Year: 2022

Month: April

Request Number: A-2020-00204

Request Summary: • All documents in the CNSC’s possession that contain any information, discussion or data pertaining to the pick up of hydrogen and/or deuterium by pressure tubes in CANDU reactors at the Pickering, Bruce and Darlington nuclear stations. • All documents that contain any mention of the so-called Design Equation used in predictive models of the corrosion of, and deuterium ingress into Zr-2.5Nb pressure tubes. • The documents should cover all data obtained in the period 2000 to 2021 through so-called scrape campaigns, or from measurements on removed pressure tubes. • The documents provided should include all reported examples of the following information: (i) The reactor and fuel channel identifier for which the sample data were obtained (ii) The in-reactor exposure time, expressed in effective full power hours or years, and the equivalent exposure hot hours (iii) The axial position of the sample as measured from the pressure tube inlet end (iv) The measured deuterium concentration expressed in units of mg/kg An example of the type and format of the data requested may be found in the July 1998 Report: Review and Predictions of Corrosion and Deuterium Uptake in the Body of Operating Reactor Pressure Tubes, OH Report No. A-FC-97-113-P or AECL Report No. 00-31100-200-005.

Disposition: Disclosed in part

Number of pages: 3324

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