ML20126M685
| ML20126M685 | |
| Person / Time | |
|---|---|
| Issue date: | 01/29/1979 |
| From: | Mattson R Office of Nuclear Reactor Regulation |
| To: | Morrison W NRC OFFICE OF STANDARDS DEVELOPMENT |
| Shared Package | |
| ML19250G967 | List:
|
| References | |
| FOIA-81-201 NUDOCS 8106190360 | |
| Download: ML20126M685 (2) | |
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Ura T E o STATES "t,
NUCLE AR REGULATORY CO'."Alss!ON j'v)'..1l' 1
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AN 2 9 B79 MEdORANDUMFOR: W. M. Morrison, Assistant Director for General Engineering Standards, DES FROM:
Roger J. Mattson, Director, Division of Systems Safety, NRR
SUBJECT:
SANDIA REPORT ON VENTILATION; REVISED DRAFT -
NOVEMBER 1978 Per your request dated December 22, 1978, wehavereviewedkesubject report. The authors reviewed existing guidelines and standards as they apply to ventilation systems in fire protection.
The authnrs evaluated four technical concepts in ventilating and concluded that a dedicated heat / smoke removal system has the best technical design basis in theory.
The report also states that further evaluation of the effect on other fire protection measures is recuired before actually applying this concept to a nuclear pcwer alant.
We do not believe that the Sandia report provides a basis for new regulatory guidance on smoke / heat ventilation systems; however, we would not object to the issuance of the Sand,1 report in a NUREG format.
Our comments on the report are presented below.
1.
Our guidelines do not require extensive use of dedicated ' heat /
smoke removal systems in nuclear power plants because of the potentially light to medium fire loads in most areas and, also, because of actual fire growth patterns (see iteni"2 below).
It should be noted that such a system in a power plant can pose substantial problems in HVAC system design and operation reli-ability and the guidelines recommend its use only for a few specific areas (see comments 3 and 4 below). Additionally, no current building codes covering facilities such as hospitals and high rise buildings specify dedicated heat / smoke removal systems because of these problems.
2.
We do not agree with the conclusion (on page 11) that normal venti-lation systems are incapable of serving as an effective smoke removal system because of their low number of air changes per hour.
The removal of smoke is of importance during the initial _ and post-fire time periods to improve accessibility for manual fire fighting.
Contact:
G. Harrison x27763 e
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-KDOP/JtDtB FOR:
Edson G. Case, Acting Director
,o Office 'of i vclesr hctor Regulation Pabert B. liinogue Director Office of Standanis Davelopent FROM:
S,ul Levino, Dircctor Office of i;uclear Regulatory Rescarch SU3 JECT:
RESEARCH Il; FORMATION LETTER (14
" PHYSICAL SEPARATION CRITERIA FOR ELECTRICAL CABLE TRAYS' (HORIZ0! ITAL OPEN
.. 2 SPACECONFIGURATION)"
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Introduction This to:aorandum trcnsmits the results of a completed portion of the I;RC Fire Protection Research Program relating to the adequacy of cable tray
-separation to prevent the. spread of electrically iiiitiated and exposure fires.
It indicates that currently used criteria for cable tray g
Y separation appear to be adequate for electrically initiated fires but
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that changes may be required for fire due to external f anf tfon' sources.
ji Backaround The specific research upon which this RIL is based is outlined in the Research Support Branch Plan (Enclosure 1) for fire Protection Research.
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De overall fire Protection Program is based on the research need L -l' identified in conjunction with the review of the Brouns Ferry fire and The through consultation and fomal review uith the HRC user gmups.
Electrical Standards and Fire Protection Research Review Gmup was the focal point for both the fomulation of the research program and-
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- r, evaluation of program results that fono the basis of this RIL.
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The specific user requirement for the research conducted to date with electrically initiated fires is based on the need to verify Regulatory Guide 1.75, " Physical Independence of Electric Systems." Exposure fire Y:
testing employing external fuel sources was conducted to prcvide data for the current NRC staff position as docur:nnted in the Appendix A to e;
the Branch Technical Position APCSB 9.5-1, " Guidelines for fire Pmtection for I:vclear Power Plants" and in tfe draft Regulatory Guide 1.120. " fire i '.
Regulatory Guide 1.75 Protection Guidelines for fioclear Pot:er Plants."
'l requires only consideration of electrically initiated fires without considerttion of any fuci source other than the cable insulation itself.
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