ML17298B993
| ML17298B993 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 03/25/1985 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| ANPP-32212-EEVB, NUDOCS 8504020188 | |
| Download: ML17298B993 (5) | |
Text
REGULATO INFORMATION DISTRIBUTION TEM (RIDS)
ACCESSION NBR;8504 FAGIL:STN 50 528 STN 50 529 STN 50 530 AUTH"eNAME VAN BRUNTiE,ED RECIP ~ NAME KNIGHTONg G ~ N ~
020188 DOC ~ DATE: 85/03/25 NOTARIZED:
NO Palo Verde Nuclear Stationi Unit li Ar izona Publi Palo Verde Nuclear Station~
Unit 2i Ar.izona Publ i Palo Verde Nuclear Station~
Unit 3~ Arizona Publ.i AUTHOR AFFILIATION Arizona Public Service Co ~
REC IPIENT AFFILIATION Licensing Branch 3
DOCKET< 0 05000528 05000529 05000530
SUBJECT:
Submits analysis of smoke detection. sys installation in response-to 850304"08 open item'rom App.R audits Deviation from provisions of NFPA 72F Section 4
3'+3i "Beam Const'."
requested.
DISTRIBUTION CODE:
A006D COPIES RECEIVED:LTR ENCL-SIZE;.
'ITLE$
OR Submittal: Fire Protection NOTES:Standardized plant ~
OL $ 12/31/8<I Standardized plant.
Standardized plant.
05000528 05000529 05000530 RECIPIENT ID CODE/NAME.
NRR LB3 BC 01 INTERNAL$ ACRS 11 ELD/HDS'3 NRR HOLONICH 07 NRR/DE CEB 09 L
04 COPIES LTTR ENCL
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2 1
RECIPIENT ID CODE/NAME ADM/LFMB IE I'WHITNEYgL NRR WAMBACH 06 NRR/DL DIR RGN5 COPIES LTTR-ENCL 1
1 1
1 1
EXTERNAL; LPDR NSIC 03 05 NRC PDR
. 02 TOTAL NUMBER OF COPIES REQUIRED:
LTTR 20 ENCL
o 4
II
Arizona Nuclear Power Project P.o. BOX 52034 o
PHOENIX, ARIZONA85072-2034 ANPP-32212-EEVB/tkQ March 25, 1985 Director of Nuclear Reactor Regulation Mr. George W. Knighton, Chief Licensing Branch No.
3 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Subject:
Palo Verde Nuclear Generating Station (PVNGS)
Units 1, 2, and 3
Docket Nos.
STN 50-528(License No. NPF-34)/529/530 Analysis of Smoke Detection System Installation File: 85-056-026.
G.1.01.10
Dear Mr. Knighton:
An analysis of the PVNGS smoke detection system installation is being provided in response to an open item from the March 4-8, 1985 Appendix R Audit.
In order to detect smoke not only at the ceiling, but from smoldering fires which may stratify at levels below the ceiling, detectors were installed in most areas throughout the power block at the ceiling, with alternate detectors dropped a minimum of 3 feet below the ceiling.
NFPA 72E-1978, in addition to recommending "engineering judgment" provides guidance for this in Appendix A, item A-4-3.1.2 "Stratification", including reference to figure A-4-3.1.2.
showing placement of alternate detectors at a 3 foot minimum distance below the ceiling.
There are more detectors than called for by the maximum 900 square foot coverage per detector.
The average coverage at PVNGS is in the range of 500 square feet per detector.
Ceiling heights vary from 18 feet. to over 30 feet.
Combustible loading is generally low (less than 30 minutes) consisting primarily of IEEE qualified cable.
In nearly all zones where heavy concentrations of cable are found, fixed automatic fire suppression systems are installed in accordance with BTP 9.5-1 Appendix A.
Smoldering fires in areas containing low combustible loading would likely produce slowly developiong or smoldering type fires if one were to occur.
This method of locating detectors is more likely to detect stratified as well as ceiling level smoke.
The PVNGS smoke detection system for the power block is designed to take into account air flow patterns, beam construction, stratification and areas of significant combustible loading.
For these reasons a deviation is requested from the provisions of NFPA 72E Section 4-3.7.3 "Beam Construction" requiring at least one detector in each bay formed by beams which exceed 18 inches in depth.
8504020i88 850325 PDR ADQCK 05000528 F
- 'Mr.-'eorge W. Knighton AnalyN.s of Smoke Detection System Installation ANPP-32212 Page 2
Please advise whether you concur that 'this is an acceptable deviation from the guidelines, of NFPA 72E.
Very truly yours,
~ <.U E..E.
Van Brunt, Jr.
Executive Vice President Project Director EEVB/DKN/mb cc:
E. A. Licitra D. J. Kubicki R.'P.
Zimmerman A. C. Gehr P.
Quails
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