ML071340192

NFPA 805 Transition Pilot Plant FAQ 06-0021, Revision 1a, Cable Air Drops

ML071340192
Person / Time
Site:	Harris
Issue date:	05/08/2007
From:	Holder A Progress Energy Carolinas
To:	Office of Nuclear Reactor Regulation
References
FAQ 06-0021, Rev 1a, NEI 04-02
Download: ML071340192 (2)

Text

FAQ Number 06-0021 FAQ Revision 1a FAQ Title Cable Air Drops Page 1 of 2 Plant: Harris Nuclear Plan (HNP)

Date: 03-27-07 Contact: Alan Holder Phone: 919-546-3372 Email:alan.holder@pgnmail.com Distribution: (NEI Internal Use) 805 TF FPWG FPRATF Purpose of FAQ:

FAQ seeks clarification on the acceptability of cable air drops, and to include this guidance in NEI 04-02, Appendix K.

Is this Interpretation of guidance?

Yes / No Proposed new guidance not in NEI 04-02?

Yes / No Details: NEI 04-02 guidance needing interpretation (include section, paragraph, and line numbers as applicable):

NEI 04-02, Section 4.3.1, Fundamental Fire Protection Program and Design Elements Transition Review, Table B-1 us es NFPA 805 Chapter 3 as part of the transition review. Specific clarificati on is requested for certain terms and phrases found in NFPA 805.

Circumstances requiring guidance interpretation or new guidance:

Clarification of NFPA-805, Standard for Fi re Protection for Light Water Reactor Electric Generating Plants (2001 Edition), Chapter 3, Sect ion 3.3.5.2, "Only metal tray and metal conduits shall be used for electrical raceways. Thin wall metallic

tubing shall not be used for power, instrume ntation, or contro l cables. Flexible metallic conduits shall only be used in short lengths to connect components."

Specifically, this FAQ asks to clarify that air drops are acceptable. Pilot Plant HNP has exposed cable drops ~ 3' in length, which represent a previously approved configuration.

FAQ Number 06-0021 FAQ Revision 1a FAQ Title Cable Air Drops Page 2 of 2 Detail contentious points if licensee and NRC have not reached consensus on the facts and circumstances:

NA Potentially relevant existing FAQ numbers:

FAQ #06-0007 Response Section:

Proposed resolution of FAQ and the basis for the proposal:

This FAQ asks to clarifying that air drops are acceptable. "HNP has exposed cable drops ~3' in length." Cable air drops ar e a typical industry configuration, and typically configured as a short length of flexible metallic conduit used when connecting components, and not all components are required to be connected via flexible metallic conduits. Generally cable air drops (bare cable runs without conduit) have been allowed without prior approval, and the configuration should be permitted for short runs as determined by the fire hazards analysis.

If appropriate, provide proposed rewording of guidance for inclusion in the next Revision:

As follows; Clarification of NFPA 805 specific sect ions as applied under NEI 04-02, to be included in (New) Appendix K, to NEI 04-02 upon approval of specific clarification (final formatting to be provided by NEI).

Specific clarification for NFPA 805 section 3.3.5.2, from FAQ 06-0021, In addition where used "cable air drops of limited length (~3 feet), are considered acceptable."