Evaluation method of modularization effect in power plant construction

Modularization has become an essential method for power plant construction. This method is widely applied to many plants, because it is known as an effective method for improving cost, schedule, quality, and safety. However, modularization effect has not been fully evaluated so far. A simple estimation, which is derived from the comparison of work efficiency between site and module factor, is often used. Other indirect or complex effects are not numerically evaluated. This imperfect evaluation leads to the ambiguity of module design criteria, and cost estimation of plant construction. Hitachi has many and long experience of modularization in BWR power plant, and usually applies more than 200 modules per unit. Based on the heuristics and the historical data, Hitachi has systematized the module evaluation method. In this paper, our approach for the evaluation systematization, categorization and relationship analysis of direct and indirect effects is described. This method can be used for designing each module, and also for total plant cost evaluation. With this method, Hitachi continues to refine modularization technology, strengthen and widen our plant construction solution for the total cost optimization. (authors)