ML20137M281

Rev 0 to Separation Requirements for Circuits Connected to Class 1E Sources Which Are Deenergized on Accident Signal

ML20137M281
Person / Time
Site:	Clinton
Issue date:	02/01/1985
From:	SARGENT & LUNDY, INC.
To:
Shared Package
ML20137M160	List: ML20137M163 ML20137M167 ML20137M175 ML20137M185 ML20137M193 ML20137M197 ML20137M206 ML20137M215 ML20137M239 ML20137M267 ML20137M281 ML20137M287 ML20137M300 U-600412, Forwards Calculations Providing Design Basis for FSAR Discussion on Electrical Separation,Including Rev 0 to 19BD-2,19BD-8,19BD-11,19BD-12,19BD-13,19BD-15,19BD-16 & 19BD-17 & Rev 1 to 19BD-5,19BD-7 & 19BD-10
References
19-BD-15, 19-BD-15-R, 19-BD-15-R00, NUDOCS 8601280231
Download: ML20137M281 (2)

Text

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SA!! GENT h LUNDY connecta$ to Class lE Sources,which are o

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V RE:SPCts!B'E DIVISICti: EFED FILE 20. : 1923 PURPOSE:

The purpose of this analysis is to demonstrate that:

1.

A cable which is connected to a Class lE power supply,~ feeds Non-Class 1E load (s). and is tripped on an accident signal, does not recuire separation from Class lE and associated or Non-Class lE cables of the same division (e.g. Seg. Code lE, lA, 13) when ph;sical separation is not practical.

2.

The regregation of the Non-Class lE cables may be designated non-safety related, associated or safety-related.

Non-Class lE loads which are connected to Class lE power supplies that are not tripped on an accident signal are not addressed in this analysis.

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C:ent Illinois Pcwer Company Prepared by Date Proiect Clinton Pcwer Station - Unit 1 Reviewed by -

lcm Proi. No. 4536-00 Eame No.

Aporeved by

!Oate JUSTIFICATICN:

IEEE-384-1974, Section 4.6 defines separation. requirements of Non-Class lE circuits to Class lE and associated circuits.

Sections 1

4.6.2 and 5.1.1.2 dictate that separation distances can be established by a'nalysis.

Regulatory Guide 1.'75, Revision 2 Regulatory. Position C.1 requires that breakers which are used as isolation devices be tripped on the receipt of an accident signal.

All circuits for Non-Class lE loads on the Clinton Project which are tripped on an accident signal become isolated from their respective __

power sources during accident conditions.

When these circuits are isolated, the conductors cannot become energized and therefore, they cannot pose a threat to the essential sources in accordance with Regulatory Guide 1.75, Revision 2 requirements.

Based on the, preceding, cables which are connected to Class lE power l

sources, feed Non-Class lE loads and are tripped on an accident l

signal, do not require separation from Ciass lE, Associated Circuits

',___,or,Non, Class _ lE Circuits of the same division when physical separation, is not practical.

The segregation of. these cabl.es may be Class lE, i

i Non-Class lE or Associated.

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