Nuclear Power Plant Emergency Generator Repairs

A major Southwest nuclear power plant, which supplies power to over 4.5 million homes, experienced a forced outage due to excessive vibration in the main generator exciter. The urgency of the repair was heightened as two other units were offline for scheduled refueling.

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Grout pad prior to demolition

Identified micro fractures in concrete

Initial grout pad demolition

Completed repairs

Project Overview

50% reduction in vibration levels of the main generator exciter
Unit was restored to full power in just 10 working days

A major Southwest nuclear power plant, which supplies power to over 4.5 million homes, experienced a forced outage due to excessive vibration in the main generator exciter. The urgency of the repair was heightened as two other units were offline for scheduled refueling.

STRUCTURAL quickly mobilized, applying specialized knowledge in rotating equipment. The team replaced the exciter’s grout pad and expanded the scope to investigate the root cause of the grout failure. To support this, STRUCTURAL TECHNOLOGIES conducted a detailed inspection and recommended additional concrete repairs.

In just 10 working days, the team completed grout removal, investigation, and repairs, restoring the unit to full power. This swift response not only fixed the immediate issue but also reduced exciter vibration levels by 50%, improving the reliability of the plant.