ML17305A496

Forwards Addl Info Re Seismic Adequacy of Nylon Cable Ties at Plant,Per 890926 Telcon.Nylon Cable Ties Not Utilized Inside Containment Bldg on safety-related Cables But Used in Auxiliary,Control & Fuel Bldgs

ML17305A496
Person / Time
Site:	Palo Verde
Issue date:	01/26/1990
From:	Conway W ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
161-02806-WFC, 161-2806-WFC, NUDOCS 9002080060
Download: ML17305A496 (10)

Text

QQCELERATED Q4 DEMONSTRATION SYSTEM DISTRIBUTION I

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'EGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9002080060 DOC.DATE: 90/01/26 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 STN-50-530 Palo Verde Nuclear Station, Unit 3, Arizona Publi 05000530 AUTH. NAME AUTHOR AFFILIATION CONWAY,W.F. Arizona Public Service Co. (formerly Arizona Nuclear Power RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Forwards addi info re seismic adequacy of nylon cable ties at plant,per 890926 telcon. D DISTRIBUTION CODE: A001D COPIES RECEIVED:LTR ENCL SIZE:

TITLE: OR Submittal: General Distribution NOTES: 05000528 Standardized plant. 05000529 A Standardized plant. 05000530 D

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL D PD5 LA 1 1 PD5 PD 1 1 CHAN,T 5 5 PETERSON,S 5 5 PETERSON,S. 5 5 INTERNAL: ACRS 6 6 NRR/DET/ECMB 9H 1 1 NRR/DOEA/OTSB11 1 1 NRR/DST 8E2 1 1 NRR/DST/SELB 8D 1 1 NRR/DST/SICB 7E 1 1 NRR/DST/SRXB 8E 1 1 NUDOCS-ABSTRACT 1 1

&f 1 0 OGC/HDS1 1 0 REG FILE 01 1 1 RES/DSIR/EIB 1 1 EXTERNAL: LPDR 1 1 NRC PDR 1 1 NSIC 1 1 NOTES 1 1 D

A D

D NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED: LTTR 38 ENCL 36

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Arizona Public Service Company P.O. BOX 53999 ~ PHOENIX, ARIZONA850724999 WILLIAMF. CONWAY EXEC UTI VE VI C E PA ES I 0 ENT 161-02806-IIIFC/RAB NUCLEAA january 26, 1990 Docket Nos. STN '50-528/529/530 Document Control Desk U. S. Nuclear Regulatory Commission Mail Station Pl-37 Washington, D. C. 20555

Reference:

Letter from D. B. Karner, APS to USNRC, 161-01819 dated April 4, 1989.

Subject:

SSFI Cable Support Evaluation File: 89-056-026

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Units 1, 2, and 3 Seismic Adequacy of Nylon Cable Ties at PVNGS During a conference call on September 26, 1989, the staff requested additional information concerning the cable support evaluation provided in the referenced letter. The staff requested information concerning location of cable ties in vertical runs other than previously reported and the design basis for such a use.

The attachment to this letter resulted from a walkdown of the PVNGS Units and responds to the questions raised in the phone call.

If you have any further questions, please call R. A. Bernier at (602) 340-4295.

Sincerely,

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WFC/RAB/ j le Attachment cc: J. B. Martin T. L. Chan M. J. Davis T. J. Polich A. C Gehr A. H. Gutterman 0(>L i',9002080060; 900126,'.-

05000528 l(4

.PDR ADOCK P PDC

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ATl'ACHMENT1 PAGE 1 REQUEST FOR ADDITIONALINFORMATION The NRC requested per a telephone conversation (

Reference:

Conversation Memorandum be-tween R. A. Bexnier and M. J. Davis dated September 26, 1989) clarification to the previous APS submittal (

Reference:

Letter 8161-01819-DBK/JMQ dated April 4, 1989) on nylon cable ties. The NRC inquired whether nylon cable ties were used on vertical cable tray runs in loca-tions other than stated in the APS submittal. In addition, the NRC inquired. as to the Design Basis for nylon cable tie usage in these locations.

In response to the above NRC question concerning the locations of the nylon cable ties, the fol-lowing is a tabulation of the various buildings along with a determination of cable tie use:

1. CONTAINMENTBUILDING: Nylon cable ties are not utilized inside of the containment building on Safety-Related cables.

2. MAIN STEAM SUPPORT STRUCTURE (MSSS): There are no nylon cable ties utilized for Safety-Related cables. Allthe Safety-Related cables in this area axe routed through conduit.

3. AUXILIARYBUILDING: Nylon cable ties are used in this building.

4. CONTROL BUILDING: Nylon cable ties are used in this building.

5. DIESEL GENERATOR BUILDING: The only Safety-Related cable trays located in the D/G Building are in the control room and are mounted in the horizontal position. Nylon cable ties are used in these trays. The remaining Safety-Related cables are routed through conduit.

6. FUEL BUILDING: Nylon cable ties are used in this building.

Based on the above, the Containment Building, the MSSS, and the Diesel Generator Building willnot be considered for further evaluation. These buildings have their Safety-Related cables routed through conduit, horizontal cable trays or do not utilize nylon cable ties. The remaining three buildings willbe further evaluated. As stated above, the NRC inquired as to the Design Basis for the nylon cable ties. The environmental Design Basis for the three (3) specified build-ings are contained in the UFSAR Table 3E-1. This Table contains the environmental parame-ters required for a Normal/Abnormal, and an Accident/Post Accident Envixonmental condi-tions. In addition, the Design Criteria Manual Section 1.6, Table 1-3, contains the postulated event combinations which must be considexed in determining the availability of equipment/

systems necessary to effect safe shutdown. These references were utilized in the evaluation of the nylon cable ties. Per the Design Criteria Manual Table 1-3, a LOCA/MSLB and a Seismic event are not considered as postulated combinations. Therefore, the UFSAR Table 3E-l Nor-mal/Abnormal environmental parameters pertaining to the cable ties in the Auxiliary, Fuel and Control Buildings willbe utilized; These Normal/Abnormal parameters are as follows:

0 0 ATTACHMENT1 PAGE 2 AUXILIARY CONTROL TEMPERATURE ( F) 50-'104 50-104 40-104 RELATIVEHUMIDITY 20-90% 20-90% 20-90%

RADIATION(RADS) 3.5E4 <1E3 <1E3 (40 Year Integrated Dose)

The above Normal/Abnormal'nvironmental parameters were compared against. the physical characteristics of Panduit nylon cable ties that were transmitted to the NRC in the above refer-ence. The comparison indicates that the Normal/Abnormal environmental parameters are en-veloped by the physical characteristics of the nylon cable ties. In addition, actual ambient and nylon cable tie (temperature detector was placed directly'in contact with the cable tie) temper-atures were taken of power cables with the results recorded on Attachment 2. The actual am-bient and nylon cable tie temperatures as recorded on Attachment 2 are within the Normal/Ab-normal temperatures identified above.

Therefore, based on the above evaluation and the previously transmitted reports, the nylon ca-ble ties have sufficient. strength to retain the cables in the trays during a seismic event.

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/ h, la ATTACHMENT2 NYLON CABLE TIE TEMPERATURE READINGS TEMPERATURE CABLE TRAY I.D. NO. LOCATION AMBIENT TIE WRAP 2EZA2AATGAM Aux. Bldg. 120'orth 84.2 F, 85.5 F Wrap 2EZA2CKIFBE Aux. Bldg. 79.6 F 80.0 F 120'orridor 2EZF2BNTFFC F.H.B. 69,9 F 70.2'F 120'ux.

2EZA2BNTFBF Bldg. '85.8 F 88.7 F 120'ast Wrap 2EZA1DBTXCF. 100'ast Corridor 78.4 79.4 F Aux. Bldg.

F'7.2'F 2EZACDBTCAW 100';East'Corridor 77.6oF Aux. Bldg..

2EZA1BBTIMN 100'ast Pene. 92.8 F 93.6 F Aux. Bldg.

2EZA1ANTYAA 100'est Pene.. 83;9 84.2 F Aux. Bldg. F'4.7 2EZA1ANTLBB 100'est Pene. F 84.9 F Aux. Bldg.

2EZA1ANTAAC 100'West Pene. 88.0'F 88.2 F Aux.:Bldg.

The readings were taken on 2/3'-4/88. The METE was a Wahl, control number IC 4341 with a calibration due date of 2/13/88.

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