A device for stabilizing a dryer assembly (18) in a reactor pressure vessel (10) of a nuclear reactor, comprising a reaction arm (202) shaped and positioned to engage and rotate around a support ( 30) retaining an upper head (12) of the reactor pressure vessel, and a spring (36) coupled to the reaction arm (202), the spring being positioned to apply a stabilizing force (38) to a bracket ( 28) supporting the steam dryer of the dryer assembly (18) with respect to the reactor pressure vessel (10).
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