project profile bwr main condenser bwr main condenser retubing pr project scope complete...
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Project Scope Complete retubing of BWR Main Condenser during refueling outage. In addition to condenser retubing, Williams performed all scaffolding work and built a conveyor system to support transport of materials into work area.
Project DescriptionWilliams managed the overall project execution including materials, equipment, tools, labor, and supervision.
The project included:
Replacement of 36,860 admiralty brass and titanium main condenser tubes and retubing
Rigging, removal and replacement of the four inlet waterboxes including new inlet circulating water expansion joints
Removal and reinstallation of electrical, mechanical and structural interferences to facilitate tube replacement
Repair of stem-side impingement protection and baffles; installation of tube bundle protection items
Fabrication of rail transportation system for tubes
Challenges 10 x 10 Condenser bay egress was limited to access way.
Large increase in quantity of stakes required. Once project commenced, an additional 42,000 stakes needed attention for a total of 72,000 stakes.
Oversized hole issues. Tube sheets were found in bad condition.
Large volume of scope increase.
Limited RP support.
Project HighlightsWilliams was able to complete the project in just 39 days5 days ahead of scheduleby implementing innovative scheduling, execution and activity re-sequencing. The U.S. record for similar scope projects prior to this outage was 56 days. Throughout the course of the project, Williams faced changes to the scope and plant delays which delayed the schedule by an additional 50 hours. Using Acumen Risk schedule modeling, Williams was able to overcome these challenges. We developed 3-point estimates for every critical path activity, established a risk register and tied the risks to the activities they affected before running the analysis. Using this technique is very unique to this industry and was a major contributor to our predictability.
100 Crescent Centre Parkway, Suite 1240 | Tucker, GA 30084 USA | office: 770.879.4400 | www.wisgrp.com
BWR Main Condenser Retubing
Location: FitzPatrick Nuclear Power Plant
Project Duration: October 2014 (39 days)
Project Value: approx. $20M
Contract Method: Firm Fixed Price
Fish screen replacement
Tube sheet on the inlet side
Conveyor build by Williams going into LSA box