METHOD OF RESTORING LIFE CHARACTERISTICS OF FUEL CELLS OF URANIUM-GRAPHITE CHANNEL-TYPE POWER REACTOR CORE Russian patent published in 2015 - IPC G21C1/12 

FIELD: physics, atomic power.

SUBSTANCE: invention relates to methods of eliminating deformations and restoring geometric parameters of the graphite stack of a channel-type reactor (RBMK) and can be used in operations aimed at restoring life characteristics of the core of a channel-type reactor upon achieving regulatory sagging, i.e. not greater than the allowed value of 50 mm. The method includes correcting geometric dimensions of graphite blocks. In each process channel, after retrieving the fuel assembly, the value and direction of sagging of the graphite column are determined, and the result is compared with the regulatory value, and local areas of the column with the same direction of sagging are identified. Operation in each of the selected areas is carried out separately. Some of the process channels with sagging greater than the standard are retrieved and the graphite blocks of the middle part of the column are cut longitudinally with the width of the cut of 10-15 mm in the direction perpendicular to the sagging of the column. A tensioner is used to generate force on the adjoining graphite column in a direction opposite to the sagging. Upon achieving the regulatory sagging value, the force is cut off and cells of the column are calibrated.

EFFECT: reduced volume and duration of repairs.

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