Multi-objective planning models for cyclical refurbishment work

对于480个排管、燃料通道以及入口和出口进料器，CANDU型反应堆的换管和进料器更换过程必须以循环方式重复，这挑战了施工项目调度和资源分配的传统概念。独特的限制比比皆是，如辐射剂量限制，同时允许在金库的人数，和进度里程碑。因此，本研究的主要目标是开发一种工具，以找到最佳的许多可能的解决方案，以安排和资源分配的核换管和馈线更换类型的项目，将包括：（1）相关约束，（2）参数，如估计的工艺生产率、机器速率和处理时间的变化，（3）多个冲突目标，如生产率、成本、进度、剂量，可预测性;（4）登记风险。将利用已建成的全尺寸模型和培训设施进行实验，以验证这一工具。 这是科学验证的独特机会。 这项研究的结果将对整个建筑行业产生广泛的影响。 我们的合作伙伴将受益于利用这一工具和与之相关的新知识，赢得世界各地的类似项目。 最终，所获得的知识也应该适用于加拿大不断增长的预制，模块化和造船业。

With 480 calandria tubes, fuel channels, and inlet and outlet feeders, the re-tube and feeder replacement processes for CANDU type reactors must be repeated in a cyclical fashion that challenges conventional concepts of construction project scheduling and resource allocation. Unique constraints abound such as radiation dosage limits, number of people allowed simultaneously in the vault, and schedule milestones. The primary objective of this research is thus to develop a tool to find the best of many possible solutions to scheduling and resource allocation for nuclear re-tube and feeder replacement type projects that will incorporate: (1) relevant constraints, (2) parameters like estimated craft productivity, machine rates, and variation in process times, (3) multiple conflicting objectives such as productivity, cost, schedule, dosage, and predictability, and (4) registered risks. Validation of this tool will be enabled by experiments conducted using the full-scale mock-up and training facility already constructed. This is a unique opportunity for scientific validation. Results of this study will have broad impact across the construction industry. Our partners will benefit by leveraging this tool and the new knowledge associated with it to win similar projects around the world. Ultimately, the knowledge gained should be applicable as well to Canada's growing prefabrication, modularization and shipbuilding industries.