ML20197J075
| ML20197J075 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 11/26/1996 |
| From: | Mershoff E NRC (Affiliation Not Assigned) |
| To: | Berkow H NRC (Affiliation Not Assigned) |
| Shared Package | |
| ML20197J055 | List: |
| References | |
| 50-348-96-09, 50-348-96-9, 50-364-96-09, 50-364-96-9, NUDOCS 9812140250 | |
| Download: ML20197J075 (18) | |
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/ UNTTED STATES NUCLEAR REGULATORY COMMISSION
., REGloN 11 C 101 MARIETTA STREET. N.W.. suTTE 2I00 ATLANTA, GEORGIA aIID01sB NCVEMBE:R 26, 1996 MEMORANDUM TO: Herbert N. Berkow, Director
! Project Directorate ll-2 , j' / Division of Reactor Projects 1/ll FROM: Ellis Merschoff, Dire 2: tor Division of Reactor Projects
SUBJECT:
l TASK INTERFACE AGREEMENT (TIA 96-023) FARLEY ! LICENSE BASIS AND ACCEPTABILITY OF KAOWOOL AS AN ELECTRICAL RACEWAY FIRE BARRIER ' During a routine inspection at ^.he Farley facility, the resident inspectors identified a number of discrepancies associated with the Kaowool fire barrier installations provided to meet the safe shutdown separation requirements of 10 CFR 50 Appendix R Section Ill.G. These i issues are documented by NRC Inspection Report 50-348,364/96-09 and are being i considered for escalated enforcement. ) j Our review also identified concems with the installed Kaowool fire barrier installations n l being bounded by the licensee's fire test / evaluation data which demonstrated that the i installed fire barriers had a 1-hour fire endurance rating. A summary with justification for ' these concems and request for technical assistance in the evaluation of this issue is i attached. ! This issue was discussed with you during your visit to the Farley facility on November 13 and _; i- 14,1996. If you have any questions please contact W. H. Miller at (404) 331-0340.
Attachment:
As stated cc w/ attachment w/o Appendices: J. Zimmerman, NRR R. Cooper, RI W. Axelson, Rill J. Dyer, RIV J. Bames, Ril
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l l i 9812140250 981214 hDR ADOCK 05000348 PDR t 910/4va so
2 GL 86-10, Supplement 1 B&W 9/6/781 B&W 1/5/78
- Review of SNOC Criteria Kaowool Xaowool IN 93-41 Test Data Sealant Test Barrier should remain No No No intact with no visible signs of raceway or cables after fire or hose stream test.
l
- NOTE: IN 93-41 provided information on NRC's review of KAOWOOL with respect i to GL 86-10 Supplement 1 criteria TESTED CONFIGURATION vs. ACTUAL INSTALI.ATION The test data for the Kaowool fire barriers installed at Farley indicated that only a 18-inch wide cable tray raceway and a 4-inch diameter conduit raceway with Kaowool were tested.
l These raceways extended through the walls of the test fumace and the fire barriers for these raceways terminated outside the fumace. There were no interruptions in these tested Kaowool fire barriers such as exist in actualinstallations. The following are examples of installed Kaowool fire barrier configurations at Farley which do - not appear to be bounded by the test documents: Knowool fire barriers for raceways were attached to floors, ceilings, and walls using a mastic coating. Tested configuration extended through the walls of the fumace. Most of the Knowool fire barrier material is int,talled on 24-inch wide cable
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l trays. Knowoolis also installed on a significate number of 4,6 and 12-inch wide cable trays. Only Knowool fire barrier installed on an 18-inc5 wide cable tray was tested. l - Knowool fire barriers are installed on a significant number of conduit less that 4-inches in diameter. Only Knowool fire banier installed on a 4-inch conduit was tested. A significant number of multiple conduits are installed within a Knowool fire barrier. Only a single 4-inch conduit with Knowool fire barrier was tested. The installed raceway fire barriers contain many penetrations for conduits, cable trays, raceway supports, etc. The tested Knowool fire barriers had no
, penetrations.
Knowool fire barriers are installed on vertical and horizontal raceways. Only horizontal raceways with Kaowool fire barriers were tested in a fumance. ATTACHMENT
\ s .. 1 . i Y, , , l 4 3 Knowool fire barrier material is installed on the bottom and two sides of a j number of cable trays. No fire barrier materials are provided for the top portion of the cable trays. Only raceways which were completely enclosed with Knowool were tested. CONCt.USIONS l Based on the above, there is insufficient information available for the region to substantiate that the Kaowool fire barriers installed at Farley will provided the required 1-hour fire rated protection. ! REQUESTED ACTION l It is requested that NRR perform a technical review to determine if this material as installed at Farley meets the NRC fire protection requirements for a 1-hour fire barrier, in addition the region recommends that NRR perform an appropriate evaluation to determine if this is a generic issue. Appendix A NRC Inspection Report 50-348,364/96-09, Section F.2.1 Appendix B Design Drawing A-177541, Applicable Sheets 18G-18V, Kaowool Blanket Wrap for Fire Protection - i Appendix C B&W Test Data dated September 6,1978, Ceramic Fiber Blanket Wrap for Fire Protection of Cable Trays and Conduits Appendix D B&W Evaluation dated January 5,1978, Sealants for Prevention of Soaking of Flammable Liquids into Kaowool Blanket Wrap Around Cable Trays During - Complete Engulfment Fires Appendix E Southem Nuclear Operating Company intemal Memorandum dated January 11,1994, Evaluation of NRC Information Notice 93-41 O ATTACHMENT
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5 TIA 96-023 FARLEY NUCLEAR PLANT LICENSE BASIS AND ACCEPTABILITY OF KAOWOOL AS AN ELECTRICAL RAC FIRE BARRIER STATEMENT OF CONCERN The Knowool 1-hour fire barriers raceway installations at Farley do not appear to be bounded by design test data and do not appear to meet guidelines of Generic Letter 86-10, Supplement 1. Appendices A-E provide additionalinformation related to this concem. ELECTRICAL RACEWAY FIRE BARRIER REQUIREMENTS To meet the provisions of 10 CFR 50 Appendix R Section Ill.G, redundant safe shutdown components are required to be separated by either a three hour fire rated barrier, 20 foot separation with area automatic fire detection and suppression systems, or separation of one redundant train by a 1-hour fire barrier with area fire detection and suppression systems. Generic Letter 86-10, Supplement 1, provided acceptable qualification for fire barriers installed to protect redundant safe shutdown trains. A comparison of the NRC criteria with available test and evaluation data from Farley is as follows: " GL 86-10, Supplement 1 B&W 9/6/78 B&W 1/5/78
- Review of SNOC Criteria Knowool Knowool IN 93 41 Test Data Sealant Test Test by independent Lab No No No
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Large Scale Test Small scale Small scale Small scale test test test Temperature measured on 426.5' C Not measured 425'F ' extemal surface of [800*+FJ NOTE: This does not raceway within the fire appear correct. barrier should not exceed 165' C [325'F) No cable damage after fire Cable Not evaluated Cable charred test. Charred - - - - - - - - - ----- Tested configuration No No Representative of plant i-should match in plant installations installations. Hose stream test. No No No i I ATTACHMENT i i l _ _
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to a U.S. NUCLEAR REGULATORY COMMISSION (NRC) REGION II Docket Nos: 50-348 and 50-364 License Nos: NPF-2 and NPF-8 i Report No: 50-348/96-09 and 50-364/96-09 1 Licensee: Southern Nuclear Operating Company (SNC). Inc. Facility: Farley Nuclear Plant (FNP). Units 1 and 2 Location: 7388 North State Highway 95 Columbia. AL 36319 i Dates: September 1 - October 12. 1996 Inspectors: T. Ross. Senior Resident Inspector J. Bartley. Resident Inspector J. Blake. Reactor Inspector (Sections M2. M3. M6. and M8) R. Caldwell, Resident Inspector (In training) R. Chou. Reactor Inspector (Section El.1 thru 3) M. Ernstes. Operator Licensing Examiner (Section 05.1) W. Kleinsorge. Reactor Inspector (Sections R1.2. R2. R3 R7) J. Lenahan. Reactor Inspector (Section E7.1 and
- 2)
- Approved by: P. Skinner. Chief. Projects Branch 2 Division of Reactor Projects l
Enclosure 2 APPDOIX A d(C) .O '
l l r. e 30 necessary based on her communications with a senior HP technician. The inspector also noticed that certain cargo spaces under the trailer which were not part of the posted RCA. were not searched. All the cargo door pad locks had been unlocked, apparently to facilitate a search. Pending i the inspectors actions to ascertain additional information on the circumstances surrounding this incident, interview responsible individuals and meet with the Security Chief, this issue is identified as Unresolved Item (URI) 50-348. 364/96-09-05. Failure to Search Contractor Trailer Prior to Entry into the Protected Area. F2 Status of Fire Protection Facilities and Equipment l F2.1 Installation and Insoection of Kaowool One-Hour Fire Barriers
- a. Insoection Scoce (71750)
A detailed discussion of the initial inspection findings associated with Kaowool one-hour fire barriers was documented in Section F2.1 of IR 50-348. 364/96-07. Due to resident inspector concerns regarding the adequacy of Kaowool installation practices and independent inspection program. URI 50-348. 364/96-07-03. Inadequate Installation and Inspection of Kaowool Fire Barriers, was identified. Since this initial inspection. the resident inspectors have conducted additional walkdowns of (aowool installations in the plant, interviewed responsible l personnel, reviewed ap)licable regulatory and FNP program requirements, i conducted meetings wit 1 plant staff and management and monitored licensee implementation of compensatory and corrective actions.
- b. Observations and Findinas On September 3.1996, in addition to the discrepancies described in IR 96-07. an inspector identified some cable trays with Kaowool/
installation deficiencies (flammastic fire seal installation and degradation). During the exit meeting on September 5. the inspectors i expressed concerns about problem', with Kaowooi installations. The licensee promptly establish fire watches to address the immediate concern of adequate fire safety, but did not consider conducting their own inspections to ascertain the scope of the problem. ! On September 25. and 30. the inspectors conducted further walkdowns of i Kaowool cable tray installations and identified additional installation i deficiencies similar to those of September 3. All inspector identified deficiencies were identified to the Operations SS and shift clerk. The shift clerks promptly initiated the appropriate compensatory actions (i.e. fire watches) pursuant to the Fire Protection Program (FPP) described in UFSAR. Appendix 98. On October 2. the inspectors identified three raceways that were not completely wrapped with Kaowool as depicted by " Safe Shutdown Raceway and Identification of Kaowool Wrap" drawings D-180536. Revision 9. and D-203281. Revision 14. These raceways were BDE-15 and BHF21 in Room 160 (1C Charging Pump power Enclosure 2 (
- l. .
l 1 l 31 cables and control wiring) and BDE-15 in room 2159 (2C Charging Pump power cables), and appeared to be part of the licensee *s FPP for ensuring safe shutdown capability. The licensee performed a preliminary engineering evaluation of the raceways with missing Kaowool and informed the inspectors that the l I drawings were in error and the raceway sections were not required to be wrapped. A further. more detailed review by the licensee determined that raceway BDE-15 (1C Charging Pump power cables) in room 160 was required to be wrapped with a one-hour fire barrier to meet 10 CFR 50. ! A)pendix R requirements of SIII.G.2 as described by the UFSAR Appendix ! 93. On October 2. the inspectors met again with licensee management to I ' discuss the continuing concern regarding the adequacy of Kaowool fire ! barrier installations throughout the plant. After the meeting. the licensee immediately initiated one-hour roving fire watches in every room of the plant that contained Kaowool. Later that same day. management briefed the inspectors on their Kaowool Action Plan which included: Revising FNP-0-FSP-43, " Visual Inspection of Kaowool Wraps." ' Revision 5: Training additional personnel to perform comprehensive Kaowool inspections: Performing walkdowns of all Kaowool installations required by the Fire Protection Program for safe shutdown: Evaluating ' and correcting any identified deficiencies: and updating the FPP and Appendix R Compliance Report as needed. On October 3. an inspector interviewed one of the two electricians responsible for performing the most recent Kaowool inspection per FNP FSP-43. This inspection had been conducted March 4-7. 1996. The responsible electrician stated that the drawings and raceway metal labels were difficult to read. He also stated that he had never ; installed or. inspected Kaowool before the March 1996 inspections, nor l had he received any training, was not knowledgeable of Kaowool l installation or design requirements. UFSAR. Appendix 9B. Section 98.6.1 ; of the FPP requires an independent inspection program to verify fire l protection systems conform with installation drawings and test
- procedures. Paragraph 98.6.1.E. requires that the inspection program includes measures to assure that personnel performing these inspections l
are knowledgeable in the design and installation requirements for fire l 3rotection. The failure to ensure inspection personnel were l (nowledgeable in the assigned inspection area was identified as an t example of an apparent violation (EEI) 50-348, 364/96-09-07. Inadequate Kaowool Inspection Program. The inspector reviewed FNP-0-FSP-43 to determine if it 3rovided adecuate l guidance to the personnel performing the inspections. JFSAR. Appencix , i 9B. paragraph 9B.6.1.F.1 requires that inspection procedures. instructions, and checklists provide identification of characteristics to be inspected. The inspectors found that the procedure only verified l that there were no breaks in the continuous run of Kaowool wrap. The Enclosure 2
1 i l 32 inspectors determined that FNP-0-FSP-43 did not direct the inspection ! personnel to examine the Kaowool for compression or the flammastic fire i seals for proper installation and deterioration. These are important characteristics which ensure the Kaowool was installed. and maintained. IAW original installation design requirements. Inspections conducted by l the NRC and the subsequent detailed walkdowns by the licensee identified l numerous deficiencies related to these characteristics. This failure of : the inspection procedure to identify all necessary design and maintenance characteristics is another example of EEI 50-348, 364/96 ,
- 07. Inadequate Kaowool Inspection Program.
On October 4. the licensee trained approximately 24 Kaowool inspectors and certified them as Level II inspectors to perform inspections of Kaowool installation. The training focused on identification and , installation detiils. It consisted of 2.5 hours of classroom ! instruction and 1 hour of on-the-job training in the plant. An inspector observed the classroom portion of the training. At the conclusion of the training the ins)ector observed that the trainees appeared to be confused. During oaservations by the inspector of some of these personnel performing inspections. this confusion was apparent during their inspections. The inspector also reviewed the proposed inspection plan. ETP-3409. and determined it was adequate. l On October 5. the licensee commenced detailed Kaowool inspections of all . installations in the plant. All inspections were coordinated by the ES ! Performance Review Group. A resident inspector observed three two-person teams during the first four houre of inspection activities. The first team observed by the resident inspctor failed to identify an i apparent problem with the flammastic seal. This deficiency was on i raceway AE0454 in Room 2316 which had no flammastic being visible eight inches up the raceway. The resident inspector discussed this oversight with the inspection team and the overall inspection coordinator. The licensee coordinator agreed that this kind of deficiency should be documented for further engineering evaluation. He then contacted each I team to ensure they understood this part of the installation criteria and the necessity of documenting all deficiencies. The resident inspector observed two more teams in the field and did not identify any more performance problems. The resident inspector concluded that this comprehensive inspection effort by the licensee should be adequate to identify existing Kaowool installation deficiencies. The licensee *s inspection took about four days to complete and identified the following:
- 1) The 1B and IC Cnaging Pump (B train) power cables and room cooler cables in Room 175 of fire area 1-004 were not fully enclosed in a fire barrier having a 1-hour rating as required 10 CFR 50.
Appendix R and the FPP. In these four particular raceways (i.e.. BDE-0A. BFDB06. BFDD15. and BHF-36) the Kaowool wrap was missing Enclosure 2
t 33 for approximately 24 inches between the cable tray and the opposing firewall.
- 2) Cables for Unit 1 main steam isolation and auxiliary feedwater flow control in raceway BHFC33 that traversed across room 319 of fire area 1-042 were not wrapped by Kaowool. The licensee had failed to install the one-hour fire barrier required by the Appendix R compliance report referenced by the FPP.
- 3) The licensee verified the resident inspectors finding that 18 feet of raceway BDE-15 carrying power cables for the 1C Charging Pump (B train) in Room 160 of fire area 1-004 was not enclosed in a fire barrier having a 1-hour rating as required by 10 CFR 50.
Appendix R and the FPP.
- 4) Thirty-six deficiency reports (DR) were generated. The DRs were broken down as follows:
Kaowool that has been compressed 21 DRs Kaowool that is partially missing 5 DRs i Kaowool missing 5 DRs Kaowool damaged or deteriorated 5 DRs
- 5) Over 100 instances were found where FNP-0-PMP-507, "Kaowool Installation Procedure " Revision 5 was not strictly followed.
PMP-507. step 6.2.8 stated that "In areas such as floors, walls, and ceilings where the blanket wrap ends, fire protection seals shall be installed as specified using mastic coatings such as... The sealant shall be troweled completely around the wra) ped cable tray at the floor, walls, or ceiling. The seals shall ce not less than 1/4" thick and extend not less than 8" onto the Kaowool and not less than 8" onto the floor, wall or ceiling." The licensee inspection identified numerous junctions where the flemmastic was not troweled for 8" completely around the Kaowool wrapped cable tray and/or did not extend 8" onto the floor, wall or ceiling. In many instances, the flammastic was also cracked, damaged, or indeterminate due to the Zetex ater wrap. FOL NPF-2, Condition 2.C(4), and FOL NPF-8, Condition 2.C(6), prescribes that Southern Nuclear shall implement and maintain in effect all provisions of the approved FPP ss described in the UFSAR. Appendix 98. Items 1) through 3) above represent examples where the licensee failed to install one-hour fire barriers as specified by the 10 CFR 50. Appendix R program described in the FPP. These noncompliant conditions are identified as EEI 50-348/96-09-06. Failure to Install Required One-hour Fire Barriers. Items 4) and 5) above, are additional performance-based examples of the inadequacy of the licensee's independent inspection program to verify Kaowool fire-barriers properly installed and maintained in the plant. Enclosure 2
. 1 4
v l I l 34 j Section 9B.6.1 of the FPP. requires an independent inspection program to verify fire protection systems conform with installation drawings and test procedures. Fire Surveillance Procedure. FNP-0-FSP-43. ' Visual l I Inspection of Kaowool Wraps." Revision 5. provided the acceptance criteria. instructions, and references for installation details for conducting inspections of Kaowool wraps used to provide the 1-hour rated fire barriers prescribed by the FPP. The number of longstanding I deficiencies identified in the ETP-3409 inspection plan demonstrated l that the Kaowool inspection program was ineffective. This is another example of EEI 50-348, 364/96-09-07 Inadequate Kaowool Inspection Program. A resident inspector also ytrformed reviews of the Kaowool Qualification testing documentation whic1 the licensee provided in res)onse to questions regarding what configuration was required for (aowool terminations at walls and ceilings and the effects of uninsulated conduits and support penetrating the Kaowool wraps. The ins)ector was not able to conclude that plant configurations were within tie scope of the tested configuration based on the documentation provided by the licensee. The qualification test configurations consisted of a Kaowool wrapped raceway and conduit extending through a catenary furnace. In all cases the Kaowool wraps extended twelve inches Jast the ends of the furnace. The furnace openings were then sealed witi Kaowool and firebrick dust. These tests do not appear to reflect the configuration of a Kaowool wrap butting against a fire rated barrier, nor penetrating conduits and supports, which are used throughout the plant. The tests 3 indicate that any gaps in the Kaowool wrap will significantly degrade ' its effectiveness. This issue is identified as URI 50-348. 364/96 08. Adequacy of Kaowool Qualification Tests to scope Installed Configurations. Resolution of this item will require additional review of the Kaowool Qualification test report and inspection of plant specific configurations by the NRC.
- c. Conclusions l The inspectors identified two apparent violations regarding I hour rated fire barriers. One apparent violation was for failure to install required one-hour fire barriers. The second apparent violation was for a failure to have an adequate inspection program for Kaowool fire barriers. The inspectors also opened URI 50-348, 364/96-09-08. Adequacy of Kaowool Qualification Tests to Scope Installed Configurations, pending further NRC review.
Enclosure 2
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't PU1 F7f.lAtrW DATA . Arrt.to?!o .r 7r ,
KANoot star.rT vup pw rrtz nonction , 1.0 g - 1.1 This specification guide covess .*e application of Kaowool the.ket wrap arpand electrical rateways for firs protection. 2.0 Ma terials, .and,,Equ,1mnl 2.1 The insulation material shall be manufacts red ty and supplied by the Rabcock & Eticaz. Rafractories Division. AuFust- Georgia 30903 or its authorised distributors. The materials shall 1 ide the folicwing: 2.1.1 Kaowool 31antait, needled. Si per cubic foot. 48" wide.1" thick, standard length and %" thick for inner wraps only. 2.1.2 High performance filament tape, 1" wide, such ar that manufactured by 3H Company. St. Pau1 4 Minnesota Tape Number 498 or its j , approved equi.ralcat.-One t'ech approved equiiIslIrn_t owuTd be f 3
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,Anch'or Contic. ental Tape type #780. . -*
2.1.3 Regulaiiar16n r 's't'eill banding 'as arial. 3/4" wide. 0.015" thick. waxed. . 2.1.3a Regular carbon steel
- eanding not wased - 3/4" vide. 015" dick may be used in place of the waxed banding. Howeve r; Ml,E a inst-11ers she11d periodically check to ensure banding O. d installat on 1. Me degrading the Kaowool or Zeten w.ap.
-Q Q 2.1.& Tenstoning tool for banding matettai
. as that manufactured by sigaode Company. Dstrago, Illinois, andel Number C-38-34 U
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seals such as that manufactured by Sigeode Ccapany Model Nueber 345pc. and crimping tool such as that manufactured by C .}R 8t i Signede Corporation 'tode! Number SRC 3423. or its equivalent. LLJ g l
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3.1 Materials should b- delivered in :he original, cightly sealed ccnts:,ners or unopened packages. all clearly labeled with the manufacturwr's name, g . . .E l product identification and tot numbers where appropriate. g g { Z 0{3 I 2.2 The Kaovoet products shall be stored within shelter to prevent damage - from westher. Q b$ U if i Z <)C " ' DU i SECHTEL Cofr. JOB 7587-03/20 SOUTHERN SERVICES INC. ; KML - ALABAMA POWER COMPANY UWh. 155 FOR CONST. l [fff{ ,_ M-b INC. 3E-4515 3 me, _ JOSEPP M. FARLEY NUCLEAR PLANT
*l he-n iuc R.N B 8kloBf 3 a m at.KNS-st-1900 ,,,,,,RY & CONDUlf DETAILS 8. NOTES 4
RT- CEV.O d _ ._a ma A-n:54q mRwrap :
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' <0 C.c21:ns.1er 41 <acmcot 3;cnket orcp shall be applied by the field.
d2 i The r,ggd shalt be responsible for selecting and supplying att
,1 tabor cs well as Furnishing other materials required to complete '
the job satisfactority in vrcordance with the written f l specirscations. I I
} 50 scoe. cot Blacket Instattation i
t i 5.1 For cabte trays with no cover and not completely Futt, Knowoot 8
! bloe.ket shalt kt cut to the same eidth cs the cable tray and laid -
l cm top cF the cables to besng the tevet cf the Knowcol to the sane I 8 height as the top of the tray. For cable trays with covers or - trays that are svFFiciently Full,//o Knopbot filler blanket is ! required. l 5.2 For the interior wrap, the Knowoot blanket shall be cut to a length surFicient to wrap cenptetely around the perimeter of the ; I g cebte tray, plus provide an overlap of blanket of not less than 3 *. (Two (2) eraps 1/2' in thickness nay be substituted for l' l
+
= cap for inner wraps only3. I 1 e 5.3 The interior wrap of bicnket shatt be held in place using l' wide Filament tape. The tape shall be spaced not less than 4' Fron the p ends of each blanket and not noce than 14' apart Fron each other. '
5.4 The next adjacent interior wrap of blanket shatt be cut to O < l completely weep arow.d the perimeter of the cable tray with enough G excess to provide en overlap of not less than 3', The adjacent blankets shalt be placed tightly together to prevent any gaps in the butt joints between each blanket. Og 8" 5.5 For the exterice k.'.snket wrap, cut blanket to sufficient length to ' wrap completely around the perimeter of the interior wrap with = sufficient excess to provide cn cverlap joint of rot less than 3*. The btenkets to be instatted s OM $"I..- the exterior layer shall be cut if - ! needed, and property located to ensuee that the butt joints on the L exterior toyer oF blanket tre not within 12* of any butt joints on 7 [ ,l8 , l the interior clanket weep. p 5.6 The exterice blanket shatt be held in place using regutar carbon i steel banding materiat as specified. The bands shatt be placed not E (d l l nore than 4' from any butt joint on the exterior blanket, nor noce Q Qj than 14* apart Fron each cther. The tension on the banding noterial shall bt sufficier.* to hold the blanket snugly in place, ; but not to cause any significant cutting or damage to the blanket ) naterial. 1 : CAD IBM.DVCi ACA 12 JMR - 01 k l 3 /a.7 G/, JMR AfDAl REDRAVN PER ABN 96-0-1009, REv. O 7df { atv. natc or oars atsee m ios adae.: a**se areas mare e maan.s Southern Company Serv:ces, Inc.nm Atalonna Power- Company JOSEPH M. FARLEY NUCLEAR PLANT g**'f **" m. p , ,. TRAY & CONDUIT DETAILS & NOTES sea n KML Twts --- ears RJP/JEL A-17754118H 3
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l 5.7 Atong the ten 0th o the cable troy in cecos whPre support nenbers '
- cone in contact with the protected troy, such suppcets shott be-
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wropped using the some techni Q ues to o distance not less thon '6' W Fron the protected cable tece,.. L. , i* 5.8 In areas such as Fioors, walls, ceilings where the blanket wrap ends, Fire protection seats shott be instotted using nostic $
* #-dd contings as specified. (One type of sentant which nay be used is a silicone rubber sentant - SF as node by BISCO). The sentant shall be trowet or sprayed completely around the wrapped' i cobte troy at the floor, watts, or ceiling. The seats 4hatt be '
not less than 1/4' thick onc extend not less than R*/ onto the Koc,woot(wrap or, if installed, onto the zetex cloth (reference 7 [ paragraph 5.10 below), nor : ;s ti
- O' onto the adjo: entff toor, !
~ watt or c eiling. Ar.other typeTsMont which nay may tie used is Carbotine Internostic #285. In additions at att knowool terninottons :
l that are .1ot at a 3 hour Fire-roted watt, Flanenostic #71A or Flanennstic 77 Mastic as nonuroctured by Flamenester Corporation l i nay be used. 5.Bo At location where a curb is used to protect conduit stub-ups Fron noisture, only the top, surface area of the curb needs to be protected with the nostic conting. l 5.9 I for Knowool installation of conduits and channels, follow the some { procedure used for cobte trays with the dimensions shown on j 1 Sheets IBM, IBN, ISP,18R and 18S of this drawing. 5.10 For Mechanicot protection of Knowoot Vrop, where required to (A) prevent exposure to heavy wear or nechanical donage, the field is directed to ins'-tt Newtex Co. , .,suct #10801-2440, style 800 non-cluminized etex cloth. The type of protection shott be used )- on power, control and instrumentation level raceways. Q i (B) O those shown on the dwgs./chonge notice Bechtel Engineering @ .g nustIF o be given written notification before the wrapping is instatted. ,
' A This is required so that the 'Votts/f t.' con be calculated and @ .3 as compared with the Prototype Test to ensure that no unusunt heat build-up will cause the conductor tenperature to exceed 900 C. y] a{I ]
(C) IF 'odditional instruneetation or control raceways are required to be wrapped other than those shown on the drawings / change notices, "j Bechtet Engineering nost be given written notification of the, --- 2 l identity of att such roceways so they may be properly documented. [Qg CAD 1BJDVG ACA 12 # JMR - 01 l 7 <C 7 /o-7 94, JMR- Mrd REDRAVN PER ABN 96-0-1009, REV. 0
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- r, sescww ncw wu we wu wu j Southern Conpany Services, Inc.nw Alabana Power- Company JOSEPH M. FARLEY NUCLEAR PLANT M*j" *" , - , un TRAY & CONDUIT DETAILS & NOTES !
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OCT 18 '96 02:56P!1 f0 CLEAR ENG & LIC . P.P/23 U.'.b.D,!{
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- CERAMIC FIRER BLANKET WRAP FOR g ,, M .:
FIRE PROTECTION OF CABLE TRAYS AND CONDUTIS % s gg f* Charles E. Chaille, Senior Project Engineer Richard L Rehnsa Babcock And WGeos Company Senior Electrical Power Plant Engineer
- Refractories Dividen CincinnatiGas And Bactric Company Augusta, Georgia 30903 Cinciansti, Ohio 45201 INTRODUC'nON* SMALL SCALE TEST 5 With tha steent nre at the Browns Ferry Nuclear Materials and Eauisment Power Plant, (1,2), there has been.a great deal of interest in protecting electrien1 ' cables in case of a he protective wraps for the cable troys and fire. In some areas of nuclear power plants, ambles conduit were made from ceramic fiber Wakats of redundast electrical systems,which are necessary which are prepared from high temperature ahnnino.
for the safe shutdown of the reactor, are in close silicate glass fibsea. These blankets contain no j proximity. If a fire should occur in one of these aganic binders, have a very low thermal conducti-areas, integrity of redundant systems may be lost vity and enn be used up to 1250*C. before the fire is extinguished. Therefore, See ne Are tests were performed in a es%
; protection to maintain 90 asinutes ofintegrity for type fucw, 0.90 m (34 in.) deep and 0.90 as redundant safety-related systems is needed when (36 in.) wide. The furnace contained two r&w' gas burners capable of delivering 1.8 bElion Joules "e^
i toh
. u ower (1.25 million BTU's) per hour per burner. The
.
- Commission (NRC) criteria for fire prohetion furnace heating rate was controlled and program-i e between redundant safety-related emble tray division is, where the redundant trays occupy ined in accordance with the heatiiv4 ate specised the same room or are within a proximity of 30 in ASTM E119 and recorded throughout the te *,. ,
j feet, all but one of the tray divisions must be pro. Eight type K 'h-----xoualaa. connected to a multi- l - tected by fire barriers having a 90 minute fire resis- point recorder, were used to monitor the temper. tance rating qualified to an ASTM E119 type fire. stares in various locations in the cable tray and As a general rule, where automatic sprinkler pro- conduit. taction is used, the fire resistance rating can be A circuit breaker. light display board was con-
' reduced to 30 minutes. structed to monitor the capability of each cable to carry current during the test. The display board Ksowool 9 ** ceramle fiber blanket was was capaMe of monitwing 30 cimuits in the cmWe evaluated as a fire protective wrap around cable tray and conduit. The display board would indlasta l -
trays and conduits. Two series of fire tests were a failure if a circuit should open or if a cable 1 performed, one small scale (independent of testing forthe Elmmer Plant) and one large scale, to deter, should short against another cable or against the mine the duration of esposure of cables in protect. cable tray or conduit. L ed cable trays and conduits to an ASTM E119 fire i before fsDure of the cables. Fire Test Results Four fire protection tests were performed.
- nis paper is in part a compilation of two The cable tray in each test was appr=8-aW 84%
previously presented pepers at the Summer, full and only two lengths of cable were in the son. 1979,andWinter.1980, Meetings of theIEEE duit. The cables were laid in the tray and conduit Power Engineering Society. paper numbers and looped at one end so that the cables could be A 79 4771 and A-80 098 5. easGy connected to the circuit breaker. light display
; board. De cables were placed in the tray in an i i ** Knowoo10 ceramic fiber blanket,130 kg/M8 orderly fashion so that the approximate cable lo-i* (8 lbs./ft.:), 25 mm (1 in i thick, manufactur. cation corresponding to each circuit on the light ed by Babcock and Wilcox Company. board would be known. A schematic diagram of a i
( . APPDOIX C bb'- (?
OCT 18 '96 02:56Pf1 rOCLEAR DL Si LIC P.3/23 I typical layout of the cables with rapect to the thermocouples in the cable tray and conduit is g a circuit numbers is shown in Figure 1. W cables shown in yigure 2. The temperature increase in
- for circuits 15,16, and 17 were not qualified as various areas of the cable tray was quite erratic.
non propagating according to IEEE.388. The so- This was probably mused by the thermocouples mainder were qualiSed cables. being near burning embles which would produce i large temperature fluctuations. In addition, there were some oscillations in the furnace controller l during the early stages of firing. N thermo- ! couples may also have come in contact with high s ao si ,, is se is is is is is is . io o voltage during the test, which could produce very i s. s a , e s,e . s s , M Wh. In general te tarinocouples on top of the cable tray increased in temperature fairly rapidly. The thermocouples on the bottom [ \\ - I, increased im. temperature more slowly since they q sol L'k* ' \.unsa were protected by the cables on top. h therseen. couple in the conduit increased in temperature Fisce 1 alowly at first but, after seven (7) minutes into the i achn, diagrass of approximate eaWe locations in emble test, began to increase very rapidly. tray with respect to circuit numbers en light board for " l small sesle tests (Note: Orenit 17 is la esadult). __ Test Number 1 - In order to establish a basis y .# J ~~ l
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for comparison, no insulation was used to protect . see. l the cables in the cable tray or conduit in the first ""' g R test.
- A solid bottom, steel, gn!vanised tray and
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W steel conduit were used in this test. The cable
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that their centers were in the center of th9 furnace. see. / h cable tray was raised approximately 50 mm , /\,.
, (2 in.) so that the flames from the burners would #
be along the sides and bottom of the cable tray. : , , , , , , m ,, a o 6 is a m The conduit was suspended above the cable tray. The ends of the furnace and conduit were sealed
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with ceramic fiber blanket. Figure 2 The sequence of cable fa!!ures which occurred Temperature incruee in various locations la oble sesy l i during Test No.11 shown in Table I. The first and esadult during test No.1. anprotected steet, solid i cable to fall was an IEEE 383 non. qualified cable bouem mWe say and sent condult. i in the tray. It failed at eight (8) minutes into the i test. N second cable failed at ten (10) minutes These results, of course, indicate that unpro-into the test. It was an IEEE-383 qualified cable tected IEEE-888 qualified cables carcot maintain located on the bottom of the tray near the dde. integrity for 30 minutes in an E119 type fire. The third cable to fall was the power cable Therefore, a dormite need exists for a Are protect. carrying circulta 18,19 and 20. When this cable ive barrier around cables in certain areas of inany 4 failed, there was a power surge thmugh the circuit nuclear power plants. l breaker panel and light board. % power to all l cables and the light board was turned off for ap. Test Number 2 - In the second test,50 mm i i proadmately one minute until the power to this (2 in.) of ceramic fiber blanket wrap was tested to i cable was turned off. When the power was turned determine if it would provide one bour of proteo-back on, several cables had apparently failed. N tion. The same type of cables, cable tray and con-
.{ cables whleh failed during this power outage are duit were used in this test as were used in Test No.
19 inarked with an asterisk in the table. The test was 1. For the cable tray 25 mm (1 in.) of blanket wm
. terminated after thirty (80) minutes. placed on top of the cables. Two 25 mm (1 in.)
N temperature rise as indicated by the thick blankets were then wrapped around the cable m .. . . _ _ _ . . _ _ _ _ _ _ 4
OCT 88 '96 02:57Pt1 fin. EAR ENG 3, LZC P.4/23 1 l
,t tray with 75 mm (8 in.) overlap )oints where the .* .'e I blankets met. A schematic diagram of theinsulat-ed cable tray is shown in Figure 8. The exterior ( ,
blanket wrap was held on with. steel brackets. A- '
.y long thelength of the cable tray, where one blanket - I<
ended and another began, the blankets were butted 4
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together. The butt joints for the inner blankets ; and outer blankets were separated by approaimate- , ,l ly 0.45 in (18 in.) and the brackets were spaced '
+ - &- ,.
approximately 0.60 m (24 in.). In order to moni- .. c tor the temperature on the outalde of the wrap,
.h one thermocouple was ptsced outside'the cable tray on the top surface of the blanket insulation.
The conduit was also wrapped with two . 25 mm
\'ci-{M -*
(1 in.) thick ceramic fiber blankets. The blankets ~g .,,_ were secured using banding material. Two banding matenals were tested, one was common carbon Figure 4 taniated able toy and conduit lastenation la fans steel, the other was atainless steel. The bands were for Gre protection Test No. 2 (before test). placed 50 mm (2 in.) on either side of the butt Joints of theexterior blanket. A photograph of the insulated cable tasy and conduit after Insertion in- ;~l ... to the furnace is shown in Figure 4. .. :.w p
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6'k*k'k'6 6 WE. -2 c_. , a unac, soma tsn nata yg 4- - iso MS casts rat rin-o risme : Schernstic diagrass of lasulated able tray for Gre protect. Temperature lacrease la various locations la emble a and conduit during Test No. 2. stret, solid bottoma los Tests Nos. 2 sad 8. sad steel conduit wrapped with 50 mm (2 la.) cess: nber blanket (lome butt joints). The sequence of cable failures in Test No. 2 is shoim in Table II. With the 50 mm (2 in.) of The resulta indicate that the insulation is y ceramic fiber blanket wrap, the Erst cable fanure effective in retarding the heat Gow into the en occurred at fifty-one (51) minutes into the test. The cable was the IEEE 388 qus11 fled cable located tray and conduit. The control thermo:ouples in the bottom of the cable tray next to the side. the thermocouple located riutside the insulst The cable in the conduit, which was a non qmffflad indicate that the furnace temperature foUm cable, failed at one (1) hour and five (5) minutes closely the ASTM E119 curve. The steelbred around the cable tray and the regular carbon a into the test. The first non-qualified cable in the and stainless steel banding material around tray to fail was No,15 which failed at (1) bour and g 4 conduit insulation performed satisfactorily du ten (10) miriutes into the test. The test was terml-the test. nated after one (1) bour and seventeen (17) minutes. Although this design performed fairly The temperature rise in the cable tray and conduit during Test No. 2 is shown in Figurs 5. It did not provide the anticipated one hour of
j OCT 18 '96 02:58PM WCLEAR ENG 8. LIC . P.5/23 i tacticn. One possible fault with the design was the test. his cable was the IEEE483 gn=11fhi g j that the steel brackets were not properly located cable located in the bottom of the cable tray near
- to adequately seal the butt joints ori the outer the side. W Srst non.qu=Hfind cable failed at one I blanket wrap. It was believed that if the brackets (1) hour and two (2) minutes into the test. N .
l were not located on each side of a butt joint, the test was terminated after one (1) hour and thirteen tray may flex during testing and the butt joint (18) minutes. The conduit cable did not fa!! be. l would open. This would permit the flames to fare the test was terminated. move in and behind the Erst layer of blanket in- The temperature rise in the able tray for Test l j sulation and could lead to an early failure of the No. 8 is shown in Figure 7. Again the ceramic cables. Therefore, additional testing was done to Aber blanket wrap retarded the heat transfer into i ( determine the effect of relocating the brackets. the tray. This resulted in a slow temperature rise in the tray. The thermocouple which was placed Test Number 3 The third test was similar to against the side of the tray indicatad the highest Test No. 2 except the steel brackets, used to hold temperature,of an of the thermocouples in the tray, t , the ceramic fiber blanket insulation on the cable j tray, were relocated. The brackets were placed 75 ~ 8-'*
- mm (3 in.) on each side of the butt joint on the "'
outer blanket wrap. A photograph showing the ownes Tava. . .- ! location of the brackets for Test No. 8 is shown in Figure 6. In addition, an aluminum, open ladder g =-
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s 3,um-eswu i cable tray and conduit were used, instead of the me- /[ , steel cable tray and conduit. .
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' Tuus Immufrsi i Figare 7 Temperature lacrease in vadoes loatleas la emble tray and sonduit during Test No. 4. alumiaam, open taddee able l
8 tray and alumlaum eenduit wrapped with 50 mm (2 la.) j . ceramic Gber blanket (tight butt joints). f l Test Number 4 .The last test in this series was l . Figure 6 similar to Test No. 2 except 25 mm (1 in.) of cera-l l insulated esbie tray for Test No. 3. Note: relocation of mic Sber blanket wrap was used on the steel cable bolding brackets . syneed 75 mm (3 ta.) on each side of tray rather than 50 mm (2 in.), his was done to { butt jolak determine if 25 mm (1 in.) of wrap would quahfy l , The sequence of cable failures in Test No. 3 for 80 minutes of fire protection. Twenty-6ve j rail 11 meters (1 in.) of blanket was laid on top of Is showninTableIII. The relocation of the holding the cablesin the cable tray. Nn 25 mm (l in.) of f brackets to within 75 mm (3 in.) on each side di blanket was wrapped around tha cable tray with a I the butt joint improved the effectiveness of the 75 mm (8 in.) overlap. AlonE the length of the blanket wrap system. As shown in Table III even cable tray where two blanket ends met, a 100 mm , with an open ladder, aluminum cable tray which l l ' could flex considerably during a fire test,the earn- (4 in.) wide strip of cerarrue fiber blanket was 3 mic Sbar blanket insulation provided excellent wrapped around the butt joint to foem a good seal. l <
. The steel bracket was placed over the 100 sam (4 j q ' d. protection for the cables as long as the buttjointa techmqueis aboq were kept tightly sealed. The Erst cable fanure in.) wide strip. This wrapping /In addition,in thlar
. . .] occurred at one (1) hour and one (1) minute into in the photograph in Figure 8 j
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f OCT 18 'SS 02:59P!1 tm DG Si LIC P.6/23 I i i l O test the conduit was protected with 38 mm (1% in.) the tray was indicated by the thermocouple which was located on the side of the tray. The thermo. j of pl Pe insulation instead of ceramic fiber blanket.
- couple in the conduit was indicating somewhat j h!6her temperatures than the thermocouples attach-ed to the cablesin the truy.
LARGE SCALE TESTS f -
- Large scale tes'.s were performed specifically l %
., for the W. H. Zimmer Nuclear Power Station Unit
- 1. This power station is located 28 miles southeast of Cincinnati on the Ohio River, and is jointly own-j ed by The Cincinnati Cas & Electric Company.
Colungus and Southern Ohio Electric Company, and The Dayton Power and Light Company. The 2436 megawatt Bolling Water Reactor is the first of the BWR.5 series reactors to undergo licensing. The design employs three redundant divisions. Figure 5 The Zimmer Nuclear Power Station utuises Insutsted cable tray for Test No. 4 300 mm (4 la.) wide solid bottom trays, and IEEE 883 qualified cables I ceramic fiber blanket strip and bracket ever butt joint. throughout. The redundant safety drvision trays are separated in accordance with IEEE-884 separ-ation criteria (3 foot horizontal, 5 foot vertical). j The sequence of cable fauures for this testis In some areas of the plant, where cables of redun. shown inTable IV. The first cable failure occurred dant, safety-related divisions are in close proximity. I ~A at forty (40) minutas into the test. Again this the decision was made to avoid the use of spankier T cable was the IEEE 383 qualified omble located in the bottom of the tray near the side. The first systerns. The presence of water could cause short j circuit failures in the electrical equipment. There-t non-qua'ified cable in the tray failed 'at fifty-two fore, the NRC required a fire protection barrier , l (52) minutes into the test. The cable in the con- around all but one of the divisions which would
. duit failed at forty-eight (48) minutas into the test. '
provide 90 minutes of protection. Iarge scale tests f The test was terminated after one (1) hour. were performed at thePortland Cement Association The temperature rise in the tray and conduit to test the ceramic fiber blanket wrap design for a l is shown in Figure 9. The highest temperature in 90 minute fire duration. run= ace ts w smarvas see- e-s.no ,W P Blanket Installation procedure _ s . v am
"'"... For the Zimmer Station, the design employed 3 I 5 ""
was to pin three 25 mm (1 in.) layers of the fiber blanket to the solid bottom tray,a procedure which see- f m vsuruiansaV, / T has previously been done to insulate waBs of foss5 l 4 j f / fired furnaces. Each layer was held by a steel clit
/ / .
I" *e ~ eenever
./ - The blankets were secured to the bottom, sidst
- j am.
/
p and lip of the tray with special care to produes
~
; # tight butt joints. (See Figures 10 and 11 for phott
- . we. ~,,,f/ grsphs of method.) The cable tray cover was inds
'k '
* ' n ' 4e s'A prendently covered with the !!ber blanket, with th,
,, i blanket extending beyond each side of the cove j y me yg,,,g so that the blanket on the cover would seal agains l g the blanket on the tray. This design was chosen t ,
) ; Temperature lasrense in vadous locations in cable tray ad permit easier access to the tray interior if additio j 4
' h sonduit during Test No. 4 steel, solid bottoni tray wrapp.
ed with 25 mra (1 in.) ceramic fiber bisaket and steelsecured to the . tray using carbon steel bandir conduit with 88 min (1% in.) pipe insulation. al cables needed to be installed. The cover wa i 5- ) i 6 ._
am P.7/23 material. r w I f -
; u-
- j EI I R u h l .- y
! y- t { . y l 1
'ha Q.~ s,. . -
.. .3 *
"-~
n g . l ;.7":-' * = I t l
?"-
~
Io _ .S.$ g - - 3 Figure 10
- i i Flas stud welded onto bottom and sides of cable tray le
- g be need to hold eerums fiber blanket wrap on tsay, f.j Fisure 12
- i
.- .. . management of ab:e tmys la Portland Cement Asuneatios I . seam rurn for image unie are testa.
I _ l j* # .,
~
- g em. =r- w
. _mq - -
4
* ~
i* -<-
= ..,. .
! , . d: a~ . 3 ,, , Werne?. I"a M l . 4.; 3llr?" '
- I j *,
J* - 4
- Fisureil
} l sottom and sides of esble tray completely .wsapped with .p;
- seramic fiber blanket for large scale tests.
i !. , ras..
. Test Procedure ' M ,, o' m '
Four trays were tested in a ten foot section of the Portland Cement Association Beam Furnace. b' E dius",' ""' This fumace, with a rated input of 7.3 b!!! ion Joules (7 m!!1 ion BTU) per hour, could rnaintain " *r the required heating rate designated in ASTM E119.
'Ihe four trays were filled to 40% with seven, con- m
,v =v w w MN an.
7=== ",[ gllL%'V' ductor, EPR. insulated hypalon jacketed cables. ,;. ,, , ,, w, , ,, ,,m, , vm The four trays were arranged in the fumace as "" ""
' -N shown in Figure it. Two of the trays were sealed risere is
. . *. - at both ends (Trays No. I and No. 4). The other creuitry fee moattoring eonunutty aWabants la reprog two were sealed at one end only. This was done matattw cables during large scale tests.
-1g '96~03feastfruifidificiTUC~
_ _ __ . ~ ~ ~ ~ ~ ~ ~ ~ ' ~ ~ ~ ~
- P.8/23
) -
i . i j
*) ** to determine if leaving the seal out on one and would increase the time before cable feDure inDe tarding the heat flow into the tray. ! trayL _e u " sus j To determine the time of faDure, the continul- s a
j ties of 15 cables at the bottom, sides, middle and ers
~
,,,, f
] top of each tray were monitored during the test. , 88"* O i . (See Figure 18 for the monitoring circuitry). The ,stes "i location of these monitored cables la the tray is (7 _n serven ervn., s shown in Figure 14. In addition, representative T cables were maggered during and after the test to == -. g obtain a measure of the negohm value.
, , , , g casu taav . -
- r. .ae
*s= s . ore .serc
~
jerac . ors .serc w ., {
- E ftner
! . wm - l , ! Figure ts Fleurs 14 Temperature distribution'thsough blanket leyess sad with. Lhasqa,ta diagram of appnMdmate, sable lessisons la b Tier No. 4 at 90 minutes late m
,$ emble tusyn for maggenag and light panel meauadag. .
i Tray No. 4 was left in the hot furnaos for j Results and Discusion approshnately 3% hours after the and of the test. 1 It was then removed, opened and inspected. In j . The sequence of cable faDuras for this testis general, the condition of the cables was good (See { . shown in Table V. The first cable failure occurred Figure 16). Some of the outerjackets on a few of
- at 94 minutes into the test WN that 75 mm tha cables had softened. However, one of the
! (8 In.) of the blanket wrap provided the 90 minutes cables that had short etreulted during the test was j of protection required by the NRC. Note that the ineggered again and found to be free of short elrcuits. l three cable faDures occurred in the lower trays, l whDe no fauures occurred in the upper trays. Ap- AMPACITY TESTS i parently the lower trays had mose heat applied I since they were within the burner flames and the Independent of the fire tests, ampacity tests ! upper trays were effectively shlalded by the lower of the blanket wrapped cable bus and cable tray trays. Also note that the cables that failed are all were run for the fouowing parameters: near the bottom corner of the lower trays. This pattern, which occurred in the small scale tests,is Knowool probably caused by the heat being applied from Service Imad Insulation 4 two directions (bottom and elde). 81 ace cable ! faDures occurred at approximately the same time in Trays No. 3 and No. 4, there is apparently no 750 MCM EP/Hypalon 1458 ampere 2larbes l benefit derived by leaving out the sent at one end cablela cable bus for of the tray. C.E.G. mainfeed l ! The temperature distribution through tbs j blar.het layers and within Tray No. 4 at 90 minutes Cable tray with power 12.6 watts / 3 inches it. or j i
.h 8 into the test is shown in Figure 15. These results show how effective the blanket insulation is in rn.
emble (750 MCM cable used forloading) 1 4
* -1 j-4 i l
i Ydd,
;u m% e m m ru.u - % e.u w,. m -- .m t
1 9 l ever, if a very conservative ambient of 400C
- p. (1040F) is assumed, then the total temperature l
j
#j.$
0,g.j- 7.;' - would be 910C with the tray in the horisontal i I e position. Since this exceeded the manufacturer's j i
'. .g" """
recommendation for continuous operation, the D,.. ~ ' g M s decision was made at Zimmer to build a structural j j corridor around the cable bus rather than wrap it
! . 1- with ceramic fiber blanket.
he results for the cable tray are shown in
- ,j Table VII. De maximum steady state temperature
, .- achieved in this test was below 900C,0even if it0 is j
" assumed that ambient msy rise to 40 C (104 F).
a Therefore, the ceramic fiber blanket wrap system 4 is being used where required on the cable trays at l
- the Zimmer plant.
j i
- COST OF MATERIA 1.5 AND INSTALI.ATION 4
~
W . l 7 .N Using the technique developed for the Zimmer i w Station, where the cable tray and lid are insulated j i
. separately, it is estimated that the cost including l
material and labor to wnp a 460 mm (18 in.) wide l I x 150 mm (6 in.) deep tray with ceramic fiber blanket is $14/ inch of blanket / linear foot of tmy. Therefore, to wrap a 8.05 m (10 ft.) trsy with 50 '
~
mm (2 in.) of blanket, would cost $280. To wnp the same tray with 75 mm (3 in.) of blanket would, , be $420. The cost can be reduced by wrapping the lid and tray as a unit. However, this reduces I yipreis the ease of scoess to the interior of the tray for Condiuan of cables in Trsy No.4 siter test.
- inspection purposes or the addition of more cables.
For the cable bus, the actual feeder cableload of a CONCLUSIONE j diesel engine generator was used. For the cable l' tray, the worse case loading for the afety-related Within the limits of this investigation, the j cables was utilized. results indicate the following conclusions: Tests were performed by cyculating the cur. tent provided by a current transformer, through 1.IEEE.388 qualified cables in an unproteet-j 750 MCM EP/Hypalon 383 grade cable, until the j ed steel, solid bottom cahle tray (without I surface temperature of the cable inside the en. lid) fail in approximately ten (10) wdnutes , closure reached steady state. The temperature in an ASTM E119 designated Gre. i rnessured included the ambient temperature which i
- was also measured separately. The tests were per. 2. Wrapping solid bottom cable trays with 15 e
fermed with the tray oriented horizontally and mm (1 in.) of ceramic fiber blanket (100
- vertically, and with both ends of the tray sealed. mm [4 in.] overlap over butt joints) pro.
In addition tests were made with only one end vides forty (40) minutes of protection in sealed to determine the benefits of partial venti. an E119 fire. l lation of the wrapped cable tray. The criterion for t passing the test was to maintain a steady state 0 8. Wrapping solid bottom or open indder temperature in the wrapped tray below 90 C, cable trays and conduit with 50 mm (2 in.) . ( of esamic fiber blanket '(Gith all butti er, which is the manufacturer's rated cable tempers. f l 3 ture for continuous use of the cable 6. joints tight) provid6s. sixty (60 minutes) of
~~
The results for the cable bus are shown in protectionin an E119 fire. ,l i . Table VI. The test for the design load passed. How.
- l
1 i 4. Wrapping solid bottom cable trays (with 4 - (2) A.J. Pryor, ** Browns Ferry Revisited," Fire lids) with 75 mm (3 in.) of cemmic fiber Journal, pp. 8546, 8849,120-121, May, l blanket provides ninety (90) minutes of l 1977. ) protection in an E119 fire, ! i 5.The ceramic f!ber blanket wrap provides
, protection for both 222-483 qualised TAtlA.1 cable and cable not gudhrt as non prope-gating according to IEEE-383. mrh hirewNo.1 u m m a.as swi c hisTrey and sessiconomis j
- 6. Loose or open butt joints in the insulation Feinsa may lead to early cable failure in engulf- T'une cissues Cabis Cabis ment fires. -
IRtltilal Ifanksr .ka!)te. lassinha T* f
~
- 7. !=.="has cable trays wSh. 75 an'n (8 in.) *$-
~
of ceramic Sher blanket doesangt, increase e:10 g 1
.rmsy Temy m .m 9 ,ggi d the., temperature of MEE-888 qualified orts, sa, to, so 'her queused a hr cables above the manufacturer's ating for !$* y continuous opemtion (900C) when loaded c:1s* s Tier qu.unes at 12.6 watts /ft. e:13,,
o:18 .7 s mr Tsay g nued gemaced
, ACKNOWLEDGEMENT o$,'
o:ta' 17
! D cement O
s w gunan d The authors wish to acknowledge the invalu. able assistance of: . o:21 gj Tsay M e:ss to Tsar gunEnsd
, R.E. Cotta . Sargent & Jundy, Elmmer Elect. 's .rais Tb'ind T#**
ric Project Engineer M.S. Abrams Director, Fire Research Depart.
- Fait =8 derbal Poest falkme and shues.wn ment, Portland Coment Association, Re-
- eearch and Development Construction Tech.
nology Laboratories, Skokie,Ill. TAa1.E i - C.F. Raldannawa . Schiraner Engineering Corp.* Elmmer Fire Protection Consultant F.L. Banta, T. Wall Husky Products Com. 3,#kDl",","M,, g y2 and su.s conduis w,.pped win so aus is in.: C"* r,hw anuen b.= sun J.inui pany who aided in both fire and ampacity tests. 1 A.J. Staubits - R.E. Kramig Co., who provided raihd ! Cse pinning of the blanket to the trays and T Chait Cahir sg'*'au G 5mmbr.r L*=daa las* dea L.C. Albers . C0&E Electrical 8ponsor Engi- o:80 Test mean - -
c:51 1 T:ny II2E.ssa genuned T.H. Mullikin - CC&E Technleal Assistant R.A. Clasby - Bechtel Corporation, Project o:ss a $.y vs N
qumuned gpN D:59 39 Tsey . Quabasd 1: Ts ga R.w. J.nss . Embeocx a wiieox, tad mans,er 1,:01
,,s 2, c ey .i, x .nh5ad.on.d 1:07 & T ny guenned '
1:10 4 Tsay gunhand REFERENCES {$ 1:10 8 s
'rier Tver N
gunhand (1) R.G. Sawyer and J.A. Elsner, " Cable Fire at 1:10 15 T*'r 88*4*'"*'d
*y bW Browns Ferry Nuclear Power Plant," Zitt.
JaumaL pp. 5-10, July,1976. 2:17 zu Tmat Terminsied t,.' M - l 9-
g gggugR ENG t. LIC ~ P.18/Es - i t
.19 3.15.
Catie reihme angessess la Tot No.3 TABLEV Ahmainosa Opse Iadest Cahis Tay and j A1===== conduit wapped wie so me r2 h.I Cable FaDurs Sequencela Larte Scale C"*""e N maak.e m amu Jains: Tat -SteelSoud Bottom Cable Tray Fan,d j then With Ihl Wrapped With 75 mm (3in.) chemic Car M .EMb!!. Cshis Ceramic FiberBlanket e:00 Tess seen
.3dSSEL M
- - FeBed 1m 1 Tany Trey cable 1:ss mas.asa emanami Olr/ Min.) Mussber g
- as nor Cesaments g.os Nene. eased is hr p 0:00 .
1:es a Test Started tiny w 1:34 8
** " 15 Short Circuit 1.m 1:36 4 6 a Short Circuit list a Tar m 1:41 4 14 Short Circuit Beginning Tiny emanned 1:42 - -
1:10 4 Tasy TestTerininated genidled 1 11 la Tsey enshnse . 1:18 Test Temumismead - - . TABLE VI
- NE Ohir Failes segesmen h Test No.4. Steel genrdenem Tse
- Results of Ampacity Testing of Cable Bas wr.,,md etik 2s een (t W.i cease rihme menv.s (100 === 14Wrapped .
5s. With 50 mm (1 in.)of Ceramic Duartap Serio Over Bett John) and Sess' Conduit wish - Fiber Blanket 35 aus (1% h.) ripe haub'. ass Failed
. Asapete Trey Inds Teensemaa= $
0:00 Test start - M Orksteden jegld Ankk3L h IgigL e$ s
@ """"8'"'"' .
i e:4s eenansd e:4s to Tiny eumaned 1500* Horisontal Both 18 81 69 n conduis Nonevanand 1800 Horizontal Both 18 75 98 o: g!
$ yo 4 an,d 1500 Vertice!
1800 Vertical Both 84 14 88 i i e .ss as Tay Both 17 34 81 I w,
- Ma.i4.=.aused
.e 1800 Vertion! Bottom 18 18 84 o$
- em 4
Tay var N eunisand
- Load of 1500 ampere represents 500 ampere per "
!$ ,e,, ,.1!,,,,,se $ phase in 8 phases while 1800 ampere representa
. ._ ," _ -- 2 800 ainp m 4= wer cimdior14a
% k 3 --%f- 8,hases. % M .
t
- e
~
N. . .i e e
. l
s P.12/23 b . TABLEVU [ assalts of Ampadry Testing of Cable Trey wrapped With 75 sun (34a.)of Ceramic
< Faer Blanket
.it Anspose Trey Eads Temsersta= (*c)
.)
g crisetasies M Ans k al gg, Total l 118 j Watts / l FL Bodsontal Both 14 45 59 ! 118 Vertim! Both 18 . t 59 . ) 12.8 Vertical Dottom 15 17 82 i . j
- Load af 12.6 watte/fL doulated worst case operak .
j ing condition of power cable by use of 750 MChi cable to circulate 1837 ampere inside enclosure. 9 i , 1 - y
- 1 4 .
3 i :
- I
) e i 1 e e / i ! I i i elle s e
~ ~ - ~--
UFT 1B '9E, ~ - ' ' ' 3O ~ ~ ~~ ~ }," NUCLIAR QK6 O LIC
,. I UNDERWRITERS LABORATORIES INC.e
,- <= o se w eruseoun. m. me m u.a. u a m iu u.a ut an independent,not-for profit organi:ation testingfor public sqfety
- c s.,
2 e@. g ra W% File R8758 005 Epgs TS Pro. ject 78NK5345 [
.ggSE September 6, 1978 REPORT on CABLE RACEWAY PROTECTION SYSTEMS FIRE TEST INVESTIGATION Babcock & Wilcox Augusta, Georgia
, copyright @ 1978 Underwriters Laboratories Inc.
Underwriters Laboratories Inc. authorizes the above named ' (Jl N company to reproduce this Report provided it is reproduced in its entirety.
- In no event shall Underwriters Laboratories Inc. be -
responsible to anyone for whatever use or nonuse is made of ! the information contained in this Report and in no event ! shall Underwriters Laboratories, its employees, or its agents incur any obligation or liability for damages, including, but not limited to, consequential damages, arising out of or in connection with the use. or inability to use, the informatien contained in this Report. The issuance of this Report in no way implies Listing,
- Classification, authorize the us )or other of UL Recognition by UL and does Listing or Classification not or Marks any other reference to Underwriters Laboratories Inc. on or in connection with the product or system. ,
l l i
p g g - - ~~ ^ ^ ^ ~ ~ ^ ^ ~ ~ i .- File R8756 Page G1 Issued: 9-6 78 i i GEEEEhk . 1 JNTRODUCTION: j
- Concern has been expressed by the Nuclear Regulatory j Commission (NAC) for the protection of the circuit integrity of.
j ~' power and control cables in the event of a fire within a nuclear ! power generating station. Specifically, protection of the j redundant control circuits is or interest. In the event of a !
- fire, although control circuits may become inoperative, the protected redundant control circuits should retain their 4
electrical integrity. ' ! The purpose of this investigation was to obtain information'~ ! on the performance of certain electrical raceway systems protected i by ceramic fiber blanket insulation, and perlite-cement ! i insulation, when subjected to a controlled fire exposure. The data obtained are intended for use only by Georgia Power and the l n V Bechtel Corporation for submission only to the Nuclear Regulatory Commission. l i The investigation consisted of witnessing four fir, tests at j the facility of Babcock & Wilcox in Augusta, Georgia. Each test was conducted with one proterted cable tray and one protected conduit system as shown in ILLS. 5-8. Each tray was filled with ! various sizes and types of cables. However, only one size and 1 type of cable was installed into each conduit. All cables were installed forming several circuits to which a low voltage, low l current load was applied.
- Each cable circuit was monitored and the time at which failure (i.e., shorting between conductors, or ground) occurred for each circuit was recorded. Each test varied
- -in fire exposure duration.
j s_, Details of the installation and test observations and results are recorded herein. LJP/KWH:plh
~
5 O
~
OCT 18 '96 03:04PM f1JCLEAR ENG & LIC P.25/23 l l l
.- o !
llh Fi5eR8758 Page 1 Issued: 9-6-78 t l 2EESBLLLL9E _ TEST APPARATUS: The test furnace employed was a catenary type kiln furnace with a chamber area for the test sample of approximately 36 in. ; wide, 36 in, deep and 31 in. maximum height, as shown in ILL. 1. i l Two burners located as shown in ILL. I provided the flame source for the furnace. ! Furnace operation consisted of mixing natural gas and combustion air (suppliec at about 0.6 in. H 2O pressure) within the burner noznle. The flame length during normal furnace operation was approximately 18 in. Due to the opposing burning configuration, the hot gases and convective heat swirled upward to the top of the furnace. Combustion products were vented by natural draft through small holes in the fire brick furnace floor ' and into a vertical stack which was ducted to the outside. llh An approximate 24 in, wide by 24 in, high opening was formed into the front and rear fire brick walls of the furnace to accommodate the sample raceways. TEST SPECIP. ENS: Cables - The cables used in this investigation were stranded copper conductors which varied in site and the number of conductors per cable. Both Okolon conductor insulation /0kolon cable jacket, and polyethylene conductor insulation / polyvinyl chloride cable jacket cables were tested. The identification of j the cable materials was on the basis of the information provided ! by the test sponsor. The cable sizes and their identification . v code for test purpose,s are shown in Table I. O O
~ ~ ' ~ ~ ~~~ ~~~ ~ ~ ~ ~ ~~ -~~ --
OCT 18 '96 ~~'03fB4PM IOCLEM M & O F P.16/23
/*
- jg y11o 88758 Page 2 Issued: 9-6-78 TABLE I Cable Description Cable Site Cable Material Cross 'C3nductor Conductor Section Insulation /
Number of Gauge Diame t er, Conductor Cable
'~' Jacket Jacket Identification _Ccnductors _
(AWG) In. ,, 31.-9 1 9 0.275 okolon 0kolon C-19 7 14 0.625 Okolon Okolen i C-22 19 12 0.965 Okolon okolon ( C-23 2 12 0.513 okolon okolon 0.611 Okolon Okolon C-24 4 12 C-25, 7 12 0 725 Okolon Okolon C-26 9 12 0.937 okolon okolon C-27 12 12 1.008 Okolon Okolon C-33 4 12 0.934 okolon 0kolon
+M7-9 . 7 6 0 935 PE/PYC PVC
+ - Copper sheathed cable. . .
r Cable Trays - Two types of cable trays were employed in this investigation. In Tests 1 and 4, steel fluted back cable trays were used. The trays were 12 f t long and 18-1/8 in. wide. The, tray side channels were 4 in. deep with 3/4 in, flanges, and Tyy, 25 fabricated from 0.070 in. thick galvanized steel. The 0.055 in. thick galvanized steel fluted back was 15/16 in. deep and formeEbf own' with 3 in, wide crests and 1 in. wide valleys, with each ' flute Bowcrs,7 spaced 6 in. 0.C. The backing was secured to the side channeigssrs /t . With spot welds, and installed with the flutes running perpendicular to the side channels. Also, 5/8 in. diameter,18 l in. long galvanized steel rods were welded 48 in. O.C. to the side s-, channels for additional support. 1 In the remaining hvo tests, aluminum open ladder type cable l trays were employed. The trays were 12 ft long and 17-3/4 in, wide. The side channels were 4 in. deep with 3/4 in, flanges, and 0.087 in. thick. The U-shaped rungs were 1 in. wide with 1 in. legs and 1/4 in. flanges, and were 0.087 in. thick. The ladder ; rungs were spaced 9 in. O C with each rung welded to each side channel.
~
O l
~l 4
m..
, &cv R:) "EB B3:05PM NUCLEAR ENG & LIC P.17/23 i l t File B8758 Page 3 Issund: 9-6-78 Conduit - In two tests 10 ft lot g, 4 in. diameter schedule 40 galvanizeo steel pipe with 0.215 in. thick walls was used as rigid metal conduit raceway. In the remaining tests, 4 in. ID diameter aluminum pipe with 0.188 in. thick walls was employed. Insulation - The insulation installed about the cable tray and conduit raceways (except in Test No. 4) was a 1 in. thick, 9 4 per ceramic fiber blanket designated as "Kaowool". The insulation installed about the conduit raceway in Test No. 4 was a 1-1/2 in, thicx, 11.8 pcf rigid perlite-cement material designated as "Kaotemp". Insulation Fasteners - Various different devices were used to temporarily and permanently fasten the insulation about the raceways. One inch wide Scotchgard filament adhesive tape was used to temporarily secure various pieces of the ceramic fiber blanket prior to installation of the permanent festeners. U-shaped steel brackets of various configurations shown in ILLS. 2 and 2A, which were manuretured from 0.131 in. thick, 1-1/2 in. wide galvanized steel, were used as permanent fasteners about the cable tray insulation. The conduit Kaowool insulation was permanently fastened with steel bands. Two types of steal bands were employed. A Type 316 " stainless steel band (1/2 in. wide 0.036 in. thick), and a coated steel band (3/4 in. wide, 0.031 in, thick) were used with their ; appropriate buckles and installed with the recommended banding tool. - The conduit Kaotemp insulation was fastened with No.16 SVG (0.062 in, diameter) steel wire. i i e i e
, File P.8758 Page 4 lasued: 9-6-78 CONSTRUCTION OF RACEWAY SYSTEMS:
One cable tray and one conduit system were investigated in each test. Various types and number of cable lecsths were
-, installed into the cable trays, and one size and one type of cable was in Tsble installed II. into the conduits as shown in ILL. 3 and as outlined All cables were cut into either 24 or 48 ft lengths. The 24 ft lengths were installed by routing the cable down the length of the tray, bending it at aidlength and then routint it bacI: to the end ,
of the tray. The 48 ft cable lengths were installed similarly. However, these cables were routed down the length of the trays four times in lieu of two. Therefore, one 24 or 48 ft length of
% cable was considered as two or four 12 ft lengths of cable within the tray, and usually' comprised one circuit as shown in Table II.
One 24 ft length of cable was installed in a similar fashion into each conduit tested and comprised one circuit. The cables were installed in two layers within the tray. The general pattern for cable installation is shown in ILL. 3A. l TABLE II - CABLE LOADING l 7est No. 1 Test No. 2 Test No. 3 Test No. 4 Nuaker \ Number Nuaker Nuaker of of of of Circuit Cable 12 Ft Cable 12 Ft Cable 12 Ft Cable 12 Ft l __ No. Code Lengths Code Lengths _ Code Lengths Code Lengths 1 C-19 2 C-19 2 C.-19 2 C-19 4 l 2 C-22 2 C-23 4 C-23 4 C-24 2 3 C-23 4 C-24 2 C-24 2 C-24 2 4 C-24 2 C-24 2 C-24 2 C-24 2 ! 5 C-24 2 C-24 2 C-24 2 C-24 2
- 6 C-24 2 C-25 2 C-25 2 C-25 2 l
7 C-25 2 C-24 2 C-25 2 C-25 2
.8 C-25 2 C-26 2 C-26 2 C-26 2 l
9 C-26 2 C-27 2 C-27 2 C-27 2
- 10 C-27 2 C-33 2 C-33 2 C-33 2
! 11 C-33 2 C-33 2 C-33 2 C-33 2 l w- 12 C-33 2 C-33 2 C-33 2 C-33 2 i 13 C-33 2 C-33 2 C-33 2 C-33 2 14 C-33 2 M7-9 2 M7-9 2 M7-9 2 15 M7-9 2 M7-9 2 M7-9 2 M7-9 2 16 M7-9 2 M7-9 4 M7-9 4 M7-9 2 17+ M7-9 2 M7-9 2 M7-9 2 M7-9 2 18-20++ B1-9 2 31-9 2 31-9 2 B1-9 2
+ - Cable installed inside of conduit.
++ - One conductor cable. However, three circuits (two single phase and ground) were constructed by connection to l
single strands. 1
esni:J'sf t@E%D itJCLEAR ENG & LIC P.19/23
/ o Fire R8758 Page 5 Issued: 9-6-78 Each cable tray was wrapped with insulation as shown in ILLS. 5-8. The insulation was installed with overlaps and staggered joints. Initially one piece of Kaowool approximately 18 in. wide by 78 in long wa,s cut and placed on top of the cables within the tray. Two pieces of Kaowool were then wrapped side by side around the tray forming one layer. The ends of each piece were overlapped and the common side between pieces butted.
Adhesive tape was wrapped randomly around each piece to temporarily secure the insulation.
In Testa 1, 2 and 3, two pieces were then wrapped side by side around the tray to form a second insulation layer. The width of the Kaowool pieces was different than that of the first layer so as to provide an offset between the location of the butt joint in the first and second layers. The ends of each piece were overlapped with the overlap staggered between the first and second layers. Adhesive tape was then randomly wrapped about each piece to temporarily secure the insulation. Details of the insulation installation for Tests 1-3 are shown in ILLS. 5-7. In Test 4, in lieu of installing a complete second layer of ~ insulation, a 4 in, wide strip of insulation was placed over the first layer butt joint which was located at the midpoint of the tray. The ends of the strip were overlapped 6-1/8 in. ..td the I piece temporarily secured with tape. Additionally, strips were I installed outside the furnace chamber near the ends of the insulation. Brackets were installed o.'r these 4 in, strips. Details ILL. 8. of the insulation installation f ar Test 4 are shown in After the insulation wrapping for the tray was completed, brackets were fastened about the insulated trays. The locations of these brackets are shown in ILLS. 5-8. The brackets were fastened by tightening the bracket bolt and thereby clamping the s_, insulation into place. e
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Fii's R8758 Page 6 Issued: 9-6-78 Kaowooi insulation was installed in two layers about the conduit in Tests 1-3. i side around the conduit forming one layer.Two pieces of Knowool were wrapp! were angle cut and butted with each other or everlappedThe ends of each piece ' approximately 3 in. I The common side between pieces was butted. Adhesive tape was wrappec randomly around each piece to ' temporarily secure the layer. Two pieces were then installed i similarly forming a second layer. The width of the pieces l differed from that of the first layer so as to provide an offset
- between 1ayers. the location of the butt joint in the first and second The ends of each piece were angle cut and butted or overlapped with the joint or everlap staggered between the first and second layers.
fasten the outer layer. Adhesive tape was then used to temporarily Steel bands were then tightened about the insulation located as shown in ILLS. 5-7. tool recommended by the band manufacturer.The bands were installed with the ban tightened compressing the insulation. The bands were In Test 4 Kaotemp insulation was installed about the con _dui t . Two 26-3/4 in. wide pieces of Kaotemp wer's installed with their common side butted at the midpoint of the conduit. The insulation as shown in was ILL.secured
- 8. with steel wire ties twist tied end located -
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- File R8758 Page T1-1 Issued: 9-6-78 1111 AIS01D l
l The four fire tests were conducted in accordance with the following test method and observed performance is described below. I
- METHOD One cable tray and one conduit system were inserted through the furnace chamber as shown in ILL. 9 for each test. The conduit i was supported by pipe hangers located cutside and approximately 2 in, away from tne front and rear surface cf the furnace. The !
l cable tray was supported by the rurance valin and an independent' l i stand outside of the furnace chamber. Location of the raceways within the furnace is shown in ILL. 9 The remaining furnace opening about the specimens was filled with Kaowcol, the ends of l the conduit stuffed with Kaowool, and space between the cables filled with fire brick dust. . Eight Type K thermocouples were installed in various locations a-s shown in ILLS. 10, 12, 14 and 16. One Type B i l thermoccuple was used to monitor the furnace temperature and was located approximately 1 to 2 in. above the tray along te s l l centerline of the furnace,15 in, from the rear furnace wall. The furnace was controlled by feedback from the furnace thermocouple. It was planned that the measured furnace I temperature for esch test be in accordance with the standard temperature-time curve as described in ASTM E119 " Fire Tests of l Building Construction Materials." i Power (220 y) was supplied to each cable circuit as shown in l j - ILL. 4. One circuit breaker was installed for each circuit.
,_ Circuit integrity was monitored by visual observation of incandescent light bulbs. Two light bulbs were provided for each circuit as shown in ILLS. 4 and 9A. The lights were connected in i
' parallel so as to provide one back-up bulb for each circuit in case of failure of the lig~ nt bulb filament. i h
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Fi'io R8758 Page T1-2 Issued: 9-6-78 l At the initiation of each test, all circuits were energized.
- Upon failure of a circuit (i.e., short circuit), the circuit breaker tripped and the light bulba for that circuit were de-energized.
Since there were no furnace windows, visual observation of the specimens was not possible. furnace fire and exposed surfaces of the Throughout each test, temperature measurements and times at which recorded. failures of circuits (monitoring light board) occurred were RESULTS Furnace Temperatures - The furnace temperature as measured by the 13, one 15 and Type 17.B thermocouple for each test are shown in ILLS.11, Temperatures - The teaperatures within and on the cable tray, and and 17. within the conduit for each test are shown in ILLS. 11, 13, 15 Circuit Failur_e are presented for each - Thetesttimes at which in Tables circuit failure occurred III-VI. Post Test Observations - In general, the ceramic insulation appeared to have a brown char near each joint. The Okolon cable jacket material changed to uhite ash while the PVC cable jacket material residue char. decomposed exposing the copper sheath and leaving a " black The general appearance of the insulation and cables after the test is shown in ILLS.18 and 19. LJP/KWH - . . o.
oCT 18 '96 03:07Pn itJCLEAR DG & LIC P.23/23 lll - i l File RB758 Page S1 Issued: i l l 9-6-78 l I EEEEhE1 In consideration of the character of the investigation, the foregoing Report is to be construed as information only and should
not he regarded as conveying any conclusion or recommendations on the part of Underwriters Labortories Inc. regarding the i
acceptability of the construction or performance of the product for recognition by any code or standard or for any other purpose, i l In general, small scale tests individually do not represent all conditions. associated with fire performance under actual fiel factors applicable. Accordingly, these test results may not be genera *** The suitability of this test method for predicting FvLL full scale performance presently has not been determined by the6t444 Laboratories. CLceaer? 9 Based upon time to first circuit failure,.the protection systems of Tests 1, 3 and 4 provided greater than 30 min of fire resistance when subjected -to a fire exposure as described herein. I Based upon time of circuit failures, the tray prot.ection
' systems with two complete layers of insulation protection (except Test 2) provided 11 to 21 min more resistance against fire than the Test 4 tray protection system with only one complete insulation layer. '
Since Test 2 differed from Test 3 only by the location of tray insulation fasteners, the fastening method employed in Test 3 provided in Test 2. 50 min more protection than the fastening method employed w '
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3 5-78 Report by: Reviewed by t hlh!YIA' LEON g. P Project Engineer R. L. PARKS f/6l Associate Managing Engineer Fire Protection Department Fire Protection Department fib l a W. NOWELL Eaeociate Managing Engineer fir. Protection Department IJP/RLP/XWN:pih
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() File R8758 , Page 33 Issued: 9-6-78
. TABLE III
_ Circuit Failure Test No. 1 Circuit No. Time of Failure, Min /See_Into Test ! 1 20 51:00 11 56:00 19 57:00 58:30 1l 58:30 17 - 61:00 5 65:00 4 67:00 2 69:30
- 8 70:00 6 70:00
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< o ile R8758 p8E8 34 Issued: 9 6-78 TABLE IV -
_ Circuit Tailure Test No. 2 Time of Failure, Circuit No. Min /Sec Into Test 1
- 2 11:30 1 5 11:40 7 g 12:30 g
13:20 6 13:35 9 14:00 3 - 14:45 11 14:50 l 1 17:30 4 18:30 10 22:15 14 26:00 Test . Terminated . 30:00 l l I V l 4 l I l' . _ _ _ _ _ _
l File R8758 Fage 35 Issued: l 9-6-78 1 . l TABLE V _ Circuit Failure Test No. 3 i Circuit No. Time of TaL1ure, Min /see Into Test 1 16 61:30 19 62:00 2 65:10 66:00 l l 20 5 67:30 3 68:30 4 69:25 18 70:20 Test 71:20 Terminated - 73200 W 4 t 1 4 4 l l J
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,, a File R8758 Page 36 Issued: 9-6-78
. TABLE VI Circuit Failure Test No. 4 Circuit No. Time of Failure s- Min /Sec Into Test 1 '
20 40 00 19 46:00 17 46:30
- 9 48: 18 15 50:38 16 52:00 2
53:00 18 . 53:17 6 $4:o9 4 57:30 3 58:07 14 58:30 Test 59:32 Terminated 60:00 ~ 4 e l I
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! File R8758 . Issued: 9-6-78 \
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. ILL.
No. Description I 1 Furnace drawing. , 1A Furnace photograph. s_, 2 Brackets. 3 cable installation. 3A General circuit locations, i 4 circuit breaker, cable diagram. i 4A Right board circuit diagram. 5 Insulation construction Test 1. . 6 Insulation construction Test 2. 6A Insulation construction appearance Test 2. Insulation construction Test 3 72 Conduit insulation construction appearance Test 3. 73 Tray insulation construction ap 8 Insulation construction Test 4.pearance Test 3 8A Tray insulation construction appearance Test 4. 8B conduit insulation construction appearance Test 4. 9 Installation into turnace. 9A circuit light board. 10 Cable tray and cor.duit theraccouple locations. Test 1. 11 Temperatures versus time, Test 1. 12 Cable tray and conduit thermocouple locations 13 Temperatures versus time, Test 2. Test 2. 14 Cable tray and conduit thermocouple locations Test 3.
.15 Temperatures versus time, Test 3.
16 Cable tray and conduit thermocouple locations. Test 4. 17 Temperatures versus time, Test 4 18 General appearance after test. 19 Generai appearance after test.
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