Interpretations

Answering questions that may arise related to the meaning of portions of an IEEE standard concerning specific applications.

IEEE Standards Interpretation for IEEE Std 387™-1995 IEEE Standard Criteria for Diesel-Generator Units Applied as Standby Power Supplies for Nuclear Power Generating Stations

Copyright © 2005 by the Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue New York, New York 10016-5997 USA All Rights Reserved.

Interpretations are issued to explain and clarify the intent of a standard and do not constitute an alteration to the original standard. In addition, interpretations are not intended to supply consulting information. Permission is hereby granted to download and print one copy of this document. Individuals seeking permission to reproduce and/or distribute this document in its entirety or portions of this document must contact the IEEE Standards Department for the appropriate license. Use of the information contained in this document is at your own risk.

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January 2005

Interpretation Request #1
Topic: Clarification Relevant Clause: 5.1.4
As per 5.1.4 of IEEE Std 387-1995, substitutions indicated in the standard, "when tests are performed at the manufacturer's or assemblers' facilities, and not at the site, the exhaust muffler, intake air filter-silencer, and radiator (if applicable) normally used for shop tests may be substituted in place of the equipment to be provided for a specific site, since it is not practical to utilize the equipment at the site or future sites for which the diesel generator unit is being qualified."

In this connection, kindly clarify (1) whether the "radiator" referred above is a jacket water heat exchanger? and (2) whether lube oil cooler can also be substituted?

Interpretation Response
The title of Clause 5 is "Factory production testing." Subclause 5.1.3 states "Although testing is preferred, analyses may supplement test or be substituted for test, where testing is not practical." The intention of the standard is to use actual site equipment whenever practical; however, relief is provided when use is not practical.

Subclause 5.1.4, the subject of this interpretation request, states "when tests are performed at the manufacturer's or assemblers' facilities, and not at the site, the exhaust muffler, intake air filter-silencer, and radiator (if applicable) normally used for shop tests may be substituted in place of the equipment to be provided for a specific site, since it is not practical to utilize the equipment at the site or future sites for which the diesel generator unit is being qualified."

Subclause 5.1.4 does not prohibit substitution of other components including a jacket water heat exchanger or a lube oil cooler. The results of the test need to be corrected to reflect the performance of the actual lube oil cooler accounting for the variations in physical characteristics and ambient environment differences.

Subclause 5.1.3 permits analyses when testing is not practical. Testing required by Clause 7, "Site Testing" will demonstrate the performance of the actual lube oil cooler under site conditions.