The core professional equipment: the service for all core professional equipment includes "three guarantees" implemented by original factories, with time limit of two year.

核心专业设备：所有核心专业设备均包含原厂家的三包服务执行。时限为二年。

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New rules imposed by the NRC require plant operators to install or improve venting systems to limit core damage in a serious accident and set up sophisticated equipment to monitor water levels in pools of spent nuclear fuel.

NPR: Nuclear Chief: US Plants Safer After Japan Crisis