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IEEE 2420

Criteria for Combustion Turbine-Generator Units Applied as Standby Power Supplies for Nuclear Power Generating Stations

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Organization: IEEE
Publication Date: 7 November 2019
Status: active
Page Count: 44
scope:

This standard describes the criteria for the application and testing of combustion turbine-generator units as Class 1E standby power supplies in nuclear power generating stations.

Figure 1 shows the boundaries of systems and equipment included in the scope of this standard. Site testing is covered in Clause 7, and the boundaries for site testing are given in 1.1.2.

Inclusions

The following items are within the scope of this standard:

a) The combustion turbine engine (i.e., turbine, compressor and combustion section), including

1) The gearbox and coupling (if applicable)

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

3) The starting system

4) The starting energy system

5) The fuel oil system (e.g., including the day tank, filters, piping, pumps, valves and strainers between the day tank and the combustion turbine)

6) The lubricating oil system

7) The cooling system, starting at the point where the cooling medium is introduced to the combustion turbine-generating unit

8) The exhaust system

9) The speed control system

b) The generator, which includes the following:

1) The excitation and voltage regulation system

2) The combustion turbine-generator output breaker at the switchgear

3) The combustion turbine-generator grounding system

c) The local control, protection, and surveillance systems associated with the combustion turbine, the generator, and their auxiliary equipment and systems cited above

d) The ac and dc distribution systems associated with the combustion turbine, the generator, and their auxiliary equipment and systems cited above, exclusive of the auxiliary power system beyond the generator terminals

e) Those elements that are essential to the safety function of combustion turbine-generator units within the scope of this standard (see Figure 1)

f) Evaluation of the characteristics of the service environment relative to performance and qualification

Inclusions for site testing

The following items are included for site testing purposes only, as described in Clause 7:

a) The ac and dc power distribution system, which includes

1) Circuits for conveying ac power from the combustion turbine-generator terminals up to and including the main disconnect device

2) Circuits for conveying ac or dc power to the combustion turbine-generator units and associated controls

3) DC power supplies, if dedicated to the combustion turbine-generator unit

b) The remote and local control, protection, and surveillance systems, which include

1) Devices for automatic and manual starting

2) Devices for load shedding and sequencing

3) Remote devices for the protection of the combustion turbine-generator unit and its auxiliary equipment

4) Synchronizing equipment

5) Field flashing devices

Exclusions

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

a) Combustion turbine-generator unit enclosure and foundations

b) External service equipment and systems that are a part of, or that are housed in, the combustion turbine-generator unit enclosure, other than those tabulated in 1.1.1, such as equipment for providing and conveying combustion air, ventilating air, etc., to the vicinity of the combustion turbine-generator unit

c) Fuel oil storage systems (storage tank, transfer pumps and filters, and strainers between the storage tank and the combustion turbine)

d) The control, protection, and surveillance systems for

1) Protecting the loads energized by the combustion turbine-generator unit

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

e) Determination of the characteristics of the service environment

f) Fire protection systems

Purpose

The purpose of this standard is to provide the principal design criteria, design features, testing, and qualification requirements for the individual combustion turbine-generator units that 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.

Document History

IEEE 2420
November 7, 2019
Criteria for Combustion Turbine-Generator Units Applied as Standby Power Supplies for Nuclear Power Generating Stations
This standard describes the criteria for the application and testing of combustion turbine-generator units as Class 1E standby power supplies in nuclear power generating stations. Figure 1 shows the...

References

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