Seismic attenuation system for a nuclear reactor

A system for attenuating seismic forces in a nuclear reactor assembly comprising:

• a containment vessel configured located above a support surface;
• a reactor pressure vessel mounted within the containment vessel to house a nuclear reactor core;
• and
• an attenuation device integrally operatively coupled to the containment vessel and located along a longitudinal centerline of the reactor pressure vessel to attenuate seismic forces transmitted from the support surface to the reactor pressure vessel via the containment vessel in a substantially transverse direction to the longitudinal centerline;
• wherein the attenuation device includes an integrated vertical key portion and an integrated lateral support portion, the integrated vertical key portion extending upwardly in a substantially vertical direction from an inner surface of the containment vessel and the integrated lateral support portion extending downwardly in a substantially vertical direction from an outer surface of the containment vessel;
• wherein the integrated vertical key portion is to engage a recess of the reactor pressure vessel to provide lateral support to the reactor pressure vessel;
• and
• wherein the integrated lateral support portion is to engage between at least a pair of stops extending upwardly from the support surface to receive the seismic forces transmitted from the support surface.