scope:

General. This standard describes the criteria for the application of diesel-generator units as individual units of the Class 1E standby power supplies in stationary nuclear power generating stations.

Inclusions. The following items are within . the scope of this standard:

(i) The diesel engine, including:

(a) The flywheel (if applicable)

(b) The combustion air system, starting at the engine air intake connection, including the effects of any remote air intake filter or silencer, or both

(c) The starting system

(d) The starting energy system

(e) The fuel oil system from the fuel oil day tank to the engine, including filters and strainers between the day tank and the engine

(f) The lubricating oil system

(g) The cooling system, starting at the point where the cooling medium is introduced to the diesel-generator unit

(h) The exhaust system, including the exhaust silencer, but excluding piping from the engine exhaust connection to the inlet of the silencer and silencer tail pipe

(i) The governor system

(2) The generator, including:

(a) The main leads terminating at the generator terminals

(b) The excitation and voltage regulation systems

(3) The local control, protection, and surveillance systems associated with the diesel engine, the generator, and their auxiliary equipment and systems cited above

(4) The ac and dc distribution systems associated with the diesel engine, the generator, and their auxiliary equipment and systems cited above, exclusive of the auxiliary power system beyond the generator terminals

(5) Those elements that are essential to the safety function of diesel-generator units within the scope

(6) Evaluation of the characteristics of the service environment, for example, relative to performance and qualification

Exclusions. The following items are outside of the scope of this standard:

(i) The diesel-generator unit enclosure and foundations

(2) The external service equipment and systems which are a part of, or which are housed in, the diesel-generator unit enclosure, other than those tabulated in 1.2, such as equipment for providing and conveying combustion air, ventilating air, etc, to the vicinity of the dieselgenerator unit

(3) The fuel oil storage system (day tank, storage tank, transfer pumps and filters, and strainers between the storage tank and the day tank)

(4) The auxiliary power system beyond the generator terminals of the diesel-generator unit, including:

(a) The conductors for transmitting power from the generator

(b) The diesel-generator unit main disconnecting and protective device

(c) The generator circuit instrument transformers, whether furnished with the diesel-generator unit or not

(d) The generator protective, relays

(5) The control, surveillance, and protection systems for:

(a) Initiating the Start Diesel Signal

(b) Loading the diesel-generator unit

(c) Protecting the loads energized by the diesel-generator unit

(d) Disconnecting the loads energized' by diesel-generator unit the diesel-generator unit

(e) Prevention of common-mode failure between the preferred power supply and the standby power supply

(6) Determination of the characteristics of the service environment

Scope Diagram. The scope diagram presented in Fig 1 illustrates the delineation of the scope.

Purpose

The purpose of this standard is to provide the principal design criteria, the design features, testing and qualification requirements for the individual diesel-generator units which enable them to meet their functional requirements as a part of the standby power supply under the conditions produced by the design basis events cataloged in the Plant Safety Analysis.