How does the scope and size of the proposed NRC inspection compare with the PSBs request?
NRC believes that the detailed engineering inspection described in the response satisfies the PSB request for system coverage and inspection size. The inspection will sample components across multiple systems to verify that design bases have been correctly implemented and to pro-actively identify latent design issues. The inspectors will use risk and engineering methods to select risk-significant components from multiple systems. The pilot inspection incorporates the “vertical slice” practice of existing and past design and engineering inspections to review the design, operation, maintenance, and testing aspects of the components selected. Although the specific sampling of components has not been finalized, they will come from at least two safety-related systems (emergency core cooling, containment, or auxiliary) and two maintenance rule, non-safety-related systems (power conversion or auxiliary). The PSB suggested that the NRC assessment should involve about 16 on-site inspector weeks
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