CASE STUDIES

reactor repair

Challenge

solution

Damage on Nozzles

Reactor Component Internals Repair

Challenge

Damage to Feedwater Sparger Nozzles

During a scheduled visual inspection of the Feedwater Sparger Nozzles, foreign material damage was revealed. This caused holes that allowed for the direction of the water to go against the reactor vessel, resulting in thermal fatigue.

The customer needed a repair solution to correct the issue with minimum critical path impact.

Repair Solution

Feedwater Sparger Repair

Our Solution

Developed Repair Hardware & Installation Tooling System

Westinghouse collaborated with the customer to develop a new, innovative repair solution that avoided in-vessel machining, which reduced critical path time impact. The solution, including discovery, design, development, and qualification, was accomplished within 1 outage cycle and was installed within 12 hours during the next outage.

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System Advantages

Design incorporates critical path savings features

No feedwater machining required

FME hardened repair system

Stabilized the existing damaged FW nozzle elbows

Springs incorporated to accommodate plant transients

Design includes secondary flow deflector shield

Jet Pump Repair

Challenge

solution

Indications on jet pump

Jet Pump RS1 Weld Repair

Challenge

Institute repair of Jet Pump riser weld

During a planned outage, visual inspection revealed three indications on the jet pump recirculation inlet piping at the RS1 weld. This was located at a depth of ~60ft under water between the shroud and the vessel wall making it difficult to access due to limited space.

The customer needed a repair solution to correct the issue with minimum critical path impact to ensure continuous safe operation of the jet pump.

RS1 Clamp

RS 1 Clamp Repair

Our Solution

Developed Repair Clamp & Delivery
Tooling System

During a 9 month period, Westinghouse’s global team of experts, from Japan, Sweden, Poland and the U.S. developed, fabricated and qualified mechanical clamps for the repair of cracks in the Unit 1 jet pump riser welds. The solution was tested on both wet and dry mockups of the jet pump & annulus. Westinghouse then successfully installed clamps during the next refueling.

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System Advantages

FME Mitigation Implemented throughout Tooling
Design Process & Delivery

Design incorporated critical path savings features

New clamp design instituted the required repair and
replaced the structural integrity of the weld

Repair schedule predictability – the repairs were
delivered within the plan window

IN-VESSEL INSPECTIONS

Challenge

solution

In-Vessel Inspections

Challenge

Reduce Inspection Critical Path Time

Inspections are required per the ASME codes and BWRVIP guidelines. The challenge to customers is how to perform quality inspections while minimizing critical path impact and costs.

Challenges include:

Minimize time to discovery of indications

Maximize inspection coverage

Available resources – both personnel & equipment

Perform inspections off critical path

In-Vessel Examinations

Our Solution

Design Innovative Inspection Tooling

Westinghouse has developed and can deploy a proven, innovative suite of reliable, FME hardened inspection tooling, systems & personnel to reduce critical path.

Westinghouse provides complete outage and non-outage maintenance services, with over 40 years of successful implementations at over 50 customer reactors worldwide.

Outage Services

Refuel Floor activities

Under-Vessel activities

Offsite Control Rod Drive Refurbishment

Fully Integrated Inspection Services

Welding and Machining

Fuel Handling Equipment Maintenance Support & Fuel Services

Ultra sonic cleaning of fuel assemblies

Proactive and reactive FME solutions

Rotating equipment

Reactor pool/cavity cleaning

Non-Outage Services

Dry Cask Fuel Services & Other Back-End Services

Spent Fuel Pool Cleaning

New Fuel Receipt

Control Rod Drive Off-Site
Rebuild

Training at the BWR facility (Chattanooga and Västerås, Sweden)

Safety valves testing Off-Site

Pumps refurbishment (Belgium)

Plant tooling maintenance

CASE STUDIES

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Westinghouse provides complete outage and non-outage maintenance services, with over 40 years of successful implementations at over 50 customer reactors worldwide.

Outage Services

Refuel Floor activities

Under-Vessel activities

Offsite Control Rod Drive Refurbishment

Fully Integrated Inspection Services

Welding and Machining

Fuel Handling Equipment Maintenance Support & Fuel Services

Ultra sonic cleaning of fuel assemblies

Proactive and reactive FME solutions

Rotating equipment

Reactor pool/cavity cleaning

Non-Outage Services

Dry Cask Fuel Services & Other Back-End Services

Spent Fuel Pool Cleaning

New Fuel Receipt

Control Rod Drive Off-SiteRebuild

Training at the BWR facility (Chattanooga and Västerås, Sweden)

Safety valves testing Off-Site

Pumps refurbishment (Belgium)

Plant tooling maintenance

CASE STUDIES

Challenge

solution

Damage on Nozzles

Reactor Component Internals Repair

Repair Solution

Feedwater Sparger Repair

Challenge

solution

Indications on jet pump

Jet Pump RS1 Weld Repair

RS1 Clamp

RS 1 Clamp Repair

Challenge

solution

In-Vessel Inspections

Inspections are required per the ASME codes and BWRVIP guidelines. The challenge to customers is how to perform quality inspections while minimizing critical path impact and costs.

Challenges include:

Minimize time to discovery of indications

Maximize inspection coverage

Available resources – both personnel & equipment

Perform inspections off critical path

In-Vessel Examinations

Westinghouse has developed and can deploy a proven, innovative suite of reliable, FME hardened inspection tooling, systems & personnel to reduce critical path.

Inspection tooling capabilities include:

Ultrasonic Testing (UT) – Phased Array

JAIMS – Jet pump diffuser & adapter welds

MAXSUM – Shroud UT examination

Access Hole Cover UT

Core Spray UT

In-Vessel Visual Inspection (IVVI)

WISE - IVVI Database system using IDDEAL

DUIT – In-Vessel visual inspection robot

ISDIP Tool - Internal Steam Dryer Inspection

SVIP Tool - External Steam Dryer Inspection

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Control Rod Drive Off-Site
Rebuild