Document: NUREG-0800
Document ID: e32f0820-4e33-476e-aa36-4ca8c2c64af0
Document Type: srp
Title: Use of Probabilistic Risk Assessment in Plant-Specific, Risk-Informed Decisionmaking:
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0119/ML011940192.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.0
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CFR Title: 

Content:
ecreasing the value of the accident sequences unaffected by the change. When the change directly impacts the HFEs (e.g., as a result of a procedure change or a change in operating practice), reviewers should ensure that the licensee appropriately model the impact; that is reviewers should ensure that the licensee addressed the following questions: whether new humar actions are introduced or whether existing actions are modified or eliminated SRP 19-A16 whether the change affects factors assumed to impact the likelihood of failure (usually called performance shaping factors or PSFs), including: the quality of the procedures; the cues available to the operators; the quality of the information (instrumentation) available to the operators; the quality of the human-machine interface; the location of the interface(s); the complexity of the task; the conditions or context within which the operators are responding, including previous failures, previous actions, etc.; the time available to perform the task; the quality of the training (type and frequency) on the specific event; the crew interactions and the potential for recovery from errors; and the stress on the operators * whether the human action dependency analysis is affected whether the application introduces or modifies dependencies between plant instrumentation and human actions * whether the screening analysis is affected When HFEs represent responses to failures of the SSCs impacted by the change, reviewers may want to focus their resources on these HFEs in the following ways: Identify any human actions that compensate for events affected by the proposed application, and ensure that the licensee did not claim inappropriate credit for these events. For human actions that are used to compensate for a basic event probability increasing as a result of proposed changes, licensee actions to ensure operator performance at the level credited in the risk analysis should also be a part of the change request. Ensure that