1. For each material balance area of an installation, the operating records shall include, where appropriate:
the operating data used to determine all changes in the quantities and composition of nuclear material present in the installation, including shipping documents for both received and shipped batches of nuclear material;
a list of inventory items and their location, kept up to date to the best extent possible;
the data, including derived estimates of random errors and systematic errors, obtained from the calibration of tanks and instruments as well as from sampling and analysis;
the data resulting from quality control measures applied to the nuclear material accountancy system, including derived estimates of random errors and systematic errors;
a description of the sequence of actions taken to prepare for, and take, a physical inventory, and to ensure that the inventory is correct and complete;
a description of the actions taken to recognise, investigate and solve nuclear material accountancy and control discrepancies that have arisen;
the results from inventory control procedures and, for bulk-handling installations, the results of the tests for acceptance of the material balance, taking into account justified measurement and process uncertainties;
a description of the actions taken to ascertain the cause and magnitude of any accidental or unmeasured loss that might have occurred;
the isotopic composition of plutonium, including its decay isotopes, and reference dates, if recorded at the installation for operational needs.
2. Original operating records shall be made available to the Commission’s inspectors, in electronic form if available. Upon a reasoned request and in compliance with Article 40(2), copies of operating records shall be communicated to the Commission, in electronic form if available. Upon a reasoned request by the operator, special arrangements concerning the form and transmission of the information may be agreed.