ML17306A815
| ML17306A815 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 06/29/1992 |
| From: | Conway W ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 102-02194-WFC-J, 102-2194-WFC-J, NUDOCS 9207080017 | |
| Download: ML17306A815 (10) | |
Text
ACCELERATED DISTRIBUTION DEMONSTF&TION SYSTEM REGULA'-I INFORMATION DISTRIBUTIOtYSTEM (RIDS)
ACCESSION NBR:9207080017 DOC.DATE: 92/06/29
'NOTARIZED: NO DOCKET FACIL:STN-50-528 Palo Verde Nuclear Station, Unit 1, Arizona Publi 05000528 STN-50-529 Palo Verde Nuclear Station, Unit 2, Arizona Publi 05000529 0TN-50-530 Palo Verde Nuclear Station, Unit 3, Arizona Publi 05000530 AUTH.NAME AUTHOR AFFILIATION CONWAYFW.F.
Arizona Public Service Co. (formerly Arizona Nuclear Power RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
SUBJECT:
Forwards 10CFR50,App R deviation evaluation re partial fire suppression in Fire Area II,Fire Zone 14,lower cable spreading room for review a approval.Existing design adequate,per 10CFR50,App R,Section III.G.2.c.
DISTRIBUTION CODE: A006D COPIES RECEIVED:LTR ENCL SIZE:
TITLE: OR/Licensing Submittal: Fire Protection NOTES:STANDARDIZED PLANT Standardized plant.
Standardized plant.
D
/
05000528 A
05000529 05000530 RECIPIENT ID CODE/NAME PD5 LA TRAMMELL,C INTERNAL: ACRS NRR/DST 8E2 NUDOCS-ABSTRACT OGC/HDS1 EXTERNAL: NRC PDR COPIES LTTR ENCL 1
0 2
2 3
3 1
1 1
1 1
0 1
1 RECIPIENT ID CODE/NAME PD5 PD THOMPSON,M NRR WERMEIL,J NRR/DST/SPLB8D1
-8/LFMB REG FIL 01 NSIC COPIES LTTR ENCL 1
1 2
2 1
0 1
1 1
0 1
1 1
1 D
R D
NOTE TO ALL"RIDS" RECIPIENTS:
PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK.
ROOM Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAMEFROM DISI'RIBUTION LIPID FOR DOCUMENTS YOU DON'T NEED!
D D
TOTAL NUMBER OF COPIES REQUIRED:
LTTR 18 ENCL 14
Arizona Public Service Company P.O. BOX 53999
~
PHOENIX. ARIZONA85072-3999 WILLIAMF. CONWAY EXECUTIVEVICEPAESIDENT NUCLEAR 102-02194-MFC/JCO June 29, 1992 U. S. Nuclear Regulatory Commission ATiN: Document Control Desk Mail Station P1-37 Washington, DC 20555
Dear Sirs:
Subject:
Palo Verde Nuclear Generating Station (PVNGS)
Units 1, 2, and 3 Docket Nos. STN 50-528/529/530 10 CFR 50 Appendix R Deviation File: 92-056-026 Arizona Public Service Company hereby submits for NRC review and approval a deviation from 10 CFR 50, Appendix R regarding partial fire suppression in Fire Area II, Fire Zone 14, lower cable spreading room.
The fire suppression system in the fire zone is installed for the protection of the cable trays in the fire area but not at the ceiling level for full area protection.
As discussed in the enclosure, the existing design provides equivalent protection to that required by 10 CFR 50, Appendix R, Section III.G.2.c and provides an acceptable level of protection to assure that there will be no adverse impact on the ability to achieve and maintain safe shutdown.
If you have any questions, please contact Thomas R.
Bradish of my staff at (602) 393-5421.
Sincerely, WFC/JCO/jco Enclosure cc:
J. B. Martin D. H. Coe A. C. Gehr A. H. Gutterman 9207D80017 920629
" PDQ ADOCK,05000528 F.
~
~
ENCLOSURE APPENDIX R DEVIATIONEVALUATION
APPENDIX R DEVIATIONEVALUATION This evaluation is performed to assess the adequacy of preaction cable tray fire suppression versus general area fire suppression in Fire Area II, Fire Zone 14, lower cable spreading room.
DISCUSSION Fire Area II, Fire Zone 14, lower cable spreading room contains Train B cables.
This zone is bounded on all sides, including floors and ceilings by 2 and 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> rated continuous fire barriers.
There is a small (2' 6') enclosed vertical raceway, along the north wall in Zone 14, at floor elevation 120', column JC-J1.
The raceway contains Train A, IEEE 383 fire resistant cables.
The raceway enclosure around the Train A cables is a 2-hour rated, 8-inch concrete masonry unit block construction from floor to ceiling (UL Design U904 and Uniform Building Code Table No. 43-B). There are two 4' 4'ccess hatches with Class B labeled 1.5-hour rated hatch covers. The raceway is sealed with 3-hour fire seals at the floor and ceiling.
The installed raceway enclosure exceeds the 1-hour fire barrier requirement of 10 CFR 50, Appendix R, Section III.G.2.C.
Fire detection in the fire zone consists of thermistor wire in each cable tray and smoke detection at the ceiling. Preaction water spray suppression systems are installed in each cable tray. Manual hose stations and portable fire extinguishers are provided. There are no ignition sources present, such as switchgear, nor other types of fixed combustibles which would present an exposure fire hazard.
The cable spreading room is typically not subject to transient combustibles and does not contain equipment or components which require frequent maintenance, surveillance or testing activities.
The room is a very low personnel activity room and the potential for fire involving transient combustibles is extremely low. The room is readily accessible for manual fire fighting.
The train separation and protection provided complies with Appendix R,Section III.G.2.c except that the suppression system installed is a preaction water spray system covering all the cable trays in lieu of ceiling level coverage for the entire area.
The unsprinklered areas of the room are those without cable trays and are not in the immediate proximity of the Train A cable raceway. The enclosed cable raceway is not exposed to unprotected combustible loads.
The raceway does not contain a sprinkler system nor combustibles other than the IEEE 383 fire resistant cables.
Cable tray only suppression for compliance with 10 CFR 50, Appendix R, Section III.G.2.c has been previously accepted by the NRC in lieu of general ceiling area sprinkler protection in another PVNGS fire zone as described in NUREG-0857, Supplement No. 6, Safety Evaluation Report related to the operation of PVNGS, Section 9.5.1.6, dated October 1984, page 9-10.
1 of2
The existing design provides equivalent protection to that required by 10 CFR 50, Appendix R, Section III.G.2.c and provides an acceptable level of protection to assure that there will be no adverse impact on the ability to achieve and maintain safe shutdown.
2of2
PVNGS Pre-Fire Strategies Manual Control Building Elev. 126' 0"
Plant North Cable JB Auxiliary JC Shaft Building "A"
-:.:::-.,-':,.:'able 5
==::,- Chase
'::'-:.:6 Q¹S Corri r
MCC Elevator Radwaste Building QS
'04 Lower Cable Sprea ing Room 03 m 'e e
ts lr&jAbr 4!":I3;:::
HVAC Outside Air Chase BOP Cable Shaft HS ¹!
Communications Room
+=
G8
=
8
=I
=
0 n
=
Sprinkler System Valve C02 System Valve Hose Station Portable Fire Exting.
ABC Extlng. (tVheeted)
Foam Exting. (wheeled)
Manual Pull (Alarm)
Oetectlon Alarm Panel O
=
Indicates Pre.Action Sprinkler 6
=
Manual Pull (Suppression) mt
=
Suppression Panel
=
Olal Telephone
=
Sound Povrer Telephone Jack
=
Emer. Shower & Eye Nash
=
Preecllcn Sprinkler System
=
HSDDelugeSystem
=
Wet Pipe Sprinkler System Zone Cable Tray Only Sprlnklers Halon 1301 C02 Flood System One Hour Barrier Two Hour Banier Three Hour Barrier Rev. 5 November 1991 211
~
t
'V I
. 0