Spring-biased fuel element bundle retainer includes additional return spring (Machine-translation by Google Translate, not legally binding)

A spring-biased fuel element bundle retainer includes an additional return spring (20) which becomes ineffective at the reactor operating temperature due to differential expansion displacement of a bundle end piece (12) relative to a reactor component (23). Apparatus for retaining a fuel element bundle (11) in a cooled nuclear reactor core during reactor cold start and hot operation of the reactor, has a return spring-biased pressing device (16), which presses the bundle against a reactor component (23) and which can slide in a bundle end piece (12) spaced from the component. The novelty is that it includes an additional return spring (20) which is in contact with the pressure device at the cold start temperature but which is separated and ineffective at the operating temperature by differential expansion displacement of the end piece relative to the component. (Machine-translation by Google Translate, not legally binding) Dispositivo de soporte de un conjunto de combustible en el núcleo de un reactor nuclear. Comprende un órgano de apoyo (16) montado deslizante en la dirección axial (10) en una abertura del soporte superior (12) del conjunto de combustible y un primer resorte (18) intercalado entre el órgano de apoyo (16) y una parte (13) del soporte superior (12) del conjunto de combustible. Comprende además un segundo resorte (20) y una parte (21) de accionamiento del órgano de apoyo (16), separada del órgano de apoyo (16), de manera que sea inactiva, a la temperatura de funcionamiento se caliente del reactor nuclear. La parte de accionamiento (21) del segundo resorte (20) está en contacto con el órgano de apoyo (16), en el momento del arranque en frío del reactor nuclear. Se limitan los esfuerzos aplicados en el conjunto de combustible (11) durante el funcionamiento normal en caliente del reactor nuclear.