Those drawings that have been updated are not accurate. For instance, the updates to the E Wing dry vacuum failed to identify the single key relay used for emergency shutdown as being important to safety. Surveillance requirements for safety-related systems appear to have little technical basis. Based on discussions with safety analysis personnel, this change appears to have no technical justification. The maintenance requirements for safety-related systems are not clearly defined.
References are also out of date.
A star marking system is used for system component identification maintenance packages, but LMES was unable to provide a procedure or process that indicated the requirements for marking such packages or identified which safety related systems and components were to be covered. In only one case was the staff able to find evidence that LMES had clearly identified the inadequacy of an existing safety system and proposed improvements for enhanced mitigation or prevention of accident consequences. LMES originally identified the E-wing filter house fire detection, isolation, and Halon extinguisher system as safety class. The Board's staff also reviewed issues raised in its April 1997 trip report on electrical and fire protection systems. The staff believes the issues of reliability, electrical safety, and fire safety raised in April 1997 with respect to this MCC would be corrected by this project.