Human Reliability Analysis in NPPs

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Human Reliability Analysis in NPPs

• CNPE

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Personnel Roles in NPP

• Operators monitor and control the plant to ensure
  it is functioning properly.
• Testing and maintenance personnel help ensure
  that plant equipment is functioning properly and
  restore components when malfunctions occur.

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• What is HRA(Human Reliability Analysis )?
• What is the purpose of HRA?

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HRA Framework For QinShan Phase II Extension
Project
Fig1. Human Reliability Analysis Framework
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HRA Methods

• THERP
• -Technique for Human Error Rate Prediction
• ASEP
• -Accident Sequence Evaluation Program Human
  Reliability Analysis Procedure
• HCR
• -Human Cognitive Reliability
• CREAM
• -Cognitive Reliability and Error Analysis
  Method
• HEART
• -Human Error Assessment and Reduction
  Technique
• SPAR
• -Standardized Plant Analysis Risk Human
  Reliability Analysis

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• HRA Method Used
• THERP was selected for QinShan Phase-II extension
  Nuclear Power Project

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An post-initiator human action example

• Human action described
• ASG isolation in 30 minutes with HHSI unavailable
  following one-tube SGTR (Steam Generator Tube
  Rupture).
• Assumptions
• Stress level High (multiplier of 5 is applied)
• Recovery by Shift Technical Advisor and Senior
  Reactor Operator

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Quantification
Notes Modified HEP mean HEP x PSF x
RF
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The Effects of The Digital IC Technique on The
Operator Performances

• A study by NRC examined the impact of introducing
  advanced human-system interfaces (HSI) into a
  conventional nuclear power plant control room.
• The general findings

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Future Research for HRA

• More studies should be conducted in the HRA
  domain to reflect the operator performance under
  the new HSIs.

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Thanks!