ML20063F356

Forwards Cdm Markups Addressing Response to Open Item F8.3.3.6-1,pertaining to Addition of non-Class 1E Loads to Class 1E Sys

ML20063F356
Person / Time
Site:	05200001
Issue date:	02/04/1994
From:	Fox J GENERAL ELECTRIC CO.
To:	Poslusny C Office of Nuclear Reactor Regulation
References
NUDOCS 9402140263
Download: ML20063F356 (5)

Text

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GE Nuclesr Energy

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February 4, 1994 Docket No. STN 52-001 Chet Poslusny, Senior Project Manager Standardization Project Directorate Associate Directorate for Advanced Reactors and License Renewal Office of Nuclear Reactor Regulation

Subject:

Submittal Supporting Accelerated ABWR Schedule - Response to Open Item FM.~. .L i 6, g. 3. 6 - I

Dear Chet:

Enclosed are CDM markups addressing the subject open item pertaining to the addition of non-Class IE loads to Class IE systems.

Please provide a copy of this transmittal to Dale Thatcher.

Since . ,

b A Fox Advanced Reactor Programs cc: Alan Beard (GE)

Norman Fletcher (DOE)

Joe Quirk (GE)

Carl Christensen (GE)

Tony James (GE) l JNF94-008 g nesaa unajir 1

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The UATs are sized to supply their load requirements, during design operating modes, of their respective Class IE dhisions and non-Class IE load groups. UATs are separated from the RAT (s). In addition, UATs are provided with their own oil pit, drain, fire deluge sysiem, grounding, and lightning protection system.

The PMG,its output circuit breaker, and UAT power feeders are separated from the RAT (s) power feeders. The PMG, its output circuit breaker, and UAT instrumentation and control circuits, are separated from the RAT (s) instrumentation and control circuits.

The hiPT and its switching station instrumentation and control circuits, from the switchyard (s) to the main control room (MCR), are separated from the RAT (s) and its switching station instrumentation and control circuits.

The medium voltage M/C switchgear and low voltage P/C switchgear, with their respective transformers, and the low voltage MCCs are sized to supply their load requirements. M/C and P/C switchgear, and MCCs are rated to withstand fault currents for the tirr.e acquired to clear the fault from the power source. The PMG output circuit breaker, and power feeder and load circuit breakers for the M/C and P/C switchgear, and MCCs are sized to supply their load requirements and are rated to interrupt fault currents.

Class IE equipment is protected from degraded voltage conditions.

EPD System interrupting devices (circuit breakers and fuses) are coordinated so that the circuit interrupter closest to the fauh opens before other devices.

Instrumentation and control power for the Cass IE dhisional medium voltage M/C switchgear and low voltage P/C switchgear is supplied from the Class 1E DC power system in the seine division.

The PMG output circuit breaker is equipped with redundant trip devices which are supplied from separate, non-Class IE DC pow r systems.

EPD System cables and bus ducts are sized to a upply their load requirements and are rated to withstand fault currents for the ting required to clear the fault from its power source.

For the EPD System, Class 1E power is supplied by three independent Class IE divisions.

Independence is maintained between Class IE divisions, and also between Class IE -

g Ag dhisions and non-Class IE equipment.

There are no automatic connections between Gass IE divisions.

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'ABWR certirescesiv uoterist Class IE DC electrical distribution system circuit inte. rupting devices (circuit breakers and fuses) are coordinated so that the circuit interrupter closest to the fault opens before other devices.

Class IE DC elecuical distribution system cables are sized to supply their load requirements and are rated to withstand fault currents for the time required to clear the fault from its power source.

The Class IE DC electrical distribution system supplies an operating voltage at the terminals of the Class 1 E utilization equipment that is within the utilization equipment's voltage tolerance limits. -

Each Class IE battery is located in a Seismic Category I structure and in its respective divisional battery room.

Class IE DC distribution panels and MCCs are identified according to their Class IE ,

division and are located in Si ismic Category I structures and in their respective divisional areas.

Class IE DC distribution system cables and raceways are identified according to their ,

Class IE division. Class IE divisional cables are routed in Seismic Category I structures and in their respective divisional raceways.

For the Class IE DC electrical distribution system, independence is provided between fosu/ A 2 Class IE divisions, and also between Class IE divisions and non-Class IE equipment.

m The Class IE DC power supply has the following alarms and displays in the main control room (MCR):

(1) Alarms for battery grot n d detection.

(2) Parameter Displays for battery voltage and amperes.

(3) Status indication for battery circuit breaker / disconnect nosition.

Class IE equipment is classified as Seismic Category I.

Class IE equipment which is located in areas designated as harsh emironment areas is ,

qualified for harsh emironments. l 4

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