Root Cause Report 2025

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The Root Cause Analysis Report aims to identify the root and contributing causes of damage to the Reactor Pressure Vessel (RPV) closure head at Davis-Besse, specifically focusing on significant degradation at nozzle 3 and minor corrosion at nozzle 2. The report highlights that the primary cause of the damage is likely Primary Water Stress Corrosion Cracking (PWSCC) in the Control Rod Drive Mechanism (CRDM) nozzles, exacerbated by boric acid corrosion due to undetected leaks over time. It emphasizes the need for improved inspection protocols, management oversight, and corrective actions to prevent recurrence, while also detailing ongoing investigations into related industry experiences and technical standards.

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What is an example of a root cause?

Notably used to identify and analyze chronic failures, which can otherwise be overlooked, this method is defined by its name: PReserving Evidence and Acquiring Data: Initial evidence collection step based on the 5-Ps Parts, Position, People, Paper, and Paradigms.

What are the 5 core principles of RCA?

PReserving Evidence and Acquiring Data: Initial evidence collection step based on the 5-Ps Parts, Position, People, Paper, and Paradigms.

What are the 5 steps of root cause analysis?

What are the steps of root cause analysis? Define the problem. Clarify what situation you want to address. Collect data. Gather data related to this issue. Ask why. Find affecting factors. Brainstorm solutions. Select solutions. Implement the solution.

What are 5 whys of root cause analysis?

Key RCA Principles Focus on Causes, Not Symptoms. Explore connections between Root Causes. Perform fact-based Analysis. Execute a non-punitive approach.

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