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Recent emphasis on increasing the availability of nuclear emergency diesel generators (EDG's) has motivated the industry to re-evaluate the maintenance philosophies utilized for these units. Improving availability, while maintaining or enhancing the existing levels of reliability, has become the challenge to nuclear utilities. In order to meet quantified reliability and availability objectives, a renewed approach to maintenance is required. The direction taken includes the initiation of a diagnostic data monitoring and trending program to assess those parameters where such methods have proven to be effective. In addition, prescribed inspections based on historical findings are recommended where needed. Periodic reviews are proposed to provide further program improvement.

A new 998 CID V8 engine series has been developed by Mack Trucks, Inc. to supplement its line of heavy duty diesel engines. These engines, the E9 Series, are available in two configurations--a 400 bhp (298 kW) high torque rise version and a 440 bhp (328 kW) conventional torque backup version. Increased horsepower and improved fuel economy were achieved through the development of a chassis mounted charge air cooler and a new four-valve cylinder head. In addition, significant durability improvements were obtained due to the reduced thermal loadings resulting from the lower charge air temperatures. Additional noteworthy features include a new injection pump, improved lube oil system, advanced piston design, and proper selection of seals and gasket materials.