ML20125B837

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Summary of 921123 Meeting W/Okonite Co & SNL Re SNL Test Results & Okonite Response to Test Failures.List of Attendees & Presentation Slides Encl
ML20125B837
Person / Time
Issue date: 11/25/1992
From: Mccracken C
Office of Nuclear Reactor Regulation
To: Thadani A
Office of Nuclear Reactor Regulation
References
NUDOCS 9212100172
Download: ML20125B837 (25)
v • d • e


Text

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November 25, 1992 MEMORANDUM FOR:

Ashok Thadani, Director Division of Systems Safety and Analysis FROM:

Conrad McCracken, Chief Plant Systems Branch Division of Systems Safety and Analysis

SUBJECT:

SUMMARY

OF NOVEMBER 23, 1992, MEETING BETWEEN NRC STAFF, SANDIA NATIONAL LABORATORIES, AND THE OKONITE COMPANY The NRC staff met with representatives of the Okonite Company and Sandia National Laboratories on November 23, 1992, to discuss the Sandia test results and Okonite's response to the test failures. NUMARC was also represented at the meeting. is a list of the attendees.

A copy of the test plan and results presented by Sandia is given in Enclosure 2.

Okonite supplied a list of customers (Enclosure 3) which indicates that their product is used in approximately 55 plants.

Sandia described the test program and the failures of the Okonite cables with bonded hypalon jackets. Okonite verified that they have not performed qualification tests of the cable with a bonded jacket, as used by Sandia.

They agreed that the hypalon jacket ages more quickly than EPR insulation.

Okonite has test data that show no chemical interaction exists between hypalon and EPR. However, the Sandia results indicate a mechanical failure of the insulation resulting from the embrittlement of the hypalon.

Okonite stated that Sandia had applied a full accident radiation dose before any thermal aging, which in their opinion was extremely severe, and also that Sandia overaged the cable during thermal aging.

%halsbnodhv Conrad E. McCracken, Chief Plant Systems Branch Division of Systems Safety and Analysis

Enclosures:

As stated DISTRIBUTION w/ enclosures:

Central File NRC PDR w/o enclosures:

SPLB R/F MVagins, RES PShemanski GHolahan RTripathi JLasky, Okonite CMcCracken HGarg JCancelosi, Okonite GHubbard EMarinos Scarfagno, Consultant JTatum SNewberry MJacobus, Sandia ADummWOOM BRogers 7

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Acceptable Hi-Pot Test Voltages t

i to Assess Cable Integrity l

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l Ray A. Vigil Sandia National Laboratories Albuquerque, New Mexico l

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Presented to Annual USNRC/ French CEA Cooperative Research Program Meeting Albuquerque, New Mexico October 26-27,1992 h

SandiaNationalLaboratories-

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Objectives 9

Determine if high potential testing (240 Vde/ mil) l e

l causes damage to selected cables.

Determine the minimum insulation thickness to l

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l establish a nominal qualified life of 40/60 years.

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Ascertain the voltage level necessary to detect damage l

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l beyond the minimum qualified thickness.

Assess whether the new voltage levels cause damage to

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selected cables.

Examine the effect of cable length on de breakdown l

voltage.

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@ Sandia National Laboratories

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Test Specimens Okonite Okolon single conductor cable with a

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FR-EPDM insulation and a bonded CSPE (Hypalon) jacket.

i Rockbestos SR single conductor cable insulated with

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silicone rubber and jacketed with fiberglass braid.

Brand Rex stranded single conductor with 30 mils of

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XLPE insulation.

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Sandia National Laboratories-

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s Test Phases Phase 1: Assess Damage Induced by 240 Vdc/ mil a

l Testing.

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Phase 2: Determine Minimum Thickness for 40/60 l

i year Nominal Qualified Life and the Corresponding Detection Voltages.

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Phase 3: Determine Damaging Effects of New Detection Voltages.

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l Sandia National Laboratories-t

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'l Phase 2 Determination of minimum insulation thickness necessary to establish a nominal qualiiied life of 40/60 years.

_GeneralInformation Ten samples of each of the 3 types of cables were

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tested.

l Samples were milled to varying amounts of remaining

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insulation thickness.

Cables were wrapped on a mandrel inside a test J

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chamber for aging and accident simulation.

i Desired conditions were simulated using sequential

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l exposures to radiation followed by thermal aging.

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Phase 2 (cont'd)

Radiation E2posure Accident radiation exposure was included with aging

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radiation exposure.

l The nominal plant radiation condition simulated was

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l 20 Mrads total aging dose.

i The accident radiation exposure consisted of 110

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Mrads at a rate of 300 kRads/hr for 433 hours0.00501 days <br />0.12 hours <br />7.159392e-4 weeks <br />1.647565e-4 months <br />.

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Sandia Nationall.aboratories-

Phase 2 (cont'd)

IlwrnullAging Aging time was 336 hours0.00389 days <br />0.0933 hours <br />5.555556e-4 weeks <br />1.27848e-4 months <br /> at 158 C.

Plant ambient temp _eratures simulated depend on

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cable type as follows:

40 YR 60 YR Cable Activation Ambient Ambient I3im_

Enerse'.

Iemo ( CL Iemn(C)-

Okonite Hypalon 1.00 69 65 I

Okonite EPR 1.10 76 72 Brand Rex 1.37 89 86 Rockbestos sir 2.55 118 116 i

Phase 2 (cont'd)

LOCAExpDane After completion of the aging exposures, the samples s

l were exposed to a LOCA simulation.

L The LOCA exposure followed the IEEE 323-1974 a

i temperature and pressure profiles for the first four days. Six additional days at constant temperature and i

pressure were used to accelerate the post-accident conditions.

Results of LOCA ter,t will indicate the thickness of insulation needed for accident functionality (" critical" thickness).

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l subjected to di9fer.tric tests as follows:

f a) 240 Vde/ mil for 5 minutes based on lowest u

remaining amount ofinsulation, b) 240 Wic/ mil for 5 minutes based on the nominal cable insulation thickness.

c) ultimate breakdown strength, i

l New xaa:ples will be artificially damaged and tested to

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descratine the voltage levels needed to detect when the-i thic.ke.ess ofinsulation is less than or equal to the

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b Notes i

14:005 July 25, 1984

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Central Station Particip;ition List Attached is the Central Station Participation List which shows the electric generating stations who have used a substantial amount of Okonite Power 6 Control Cable.

TYPE OF CABLE - Legend 11 - High Voltage Cabic (Okoguard)

L Low Voltage Cable (Okonite, Okonite RR or X-Olene RR)

C - Control Cabic (Okonite, Okonite-RR or X-Olene BR) 1 - Instrumentation (Okonite, Okonite-BR, X-Olene BR or Oko:el)

S - Special R. A. Guba RAG /rtp attachment i

@ THQ pone artico so, aao Aamoey, New Jersey 0744G OKONITE 2010250300 Cable Okonite CENTRAL STATION PARTICIPATION LIST Each electric generating station listed respresents the use of a a substantial amount of OKONITE Power 6 Control Cabic.

1 TYPE OF CABLE - Legend H - liigh Voltage Cable (Okoguard)

L - Lcw Voltage Cable (Okonite, Okonite-RR or X-Olene BR)

C - Control Cable (Okonite, Okonite-BR or X-Olene BR) 1 - Instrumentation (Okonite. Okonite-RR, X001ene BR or Okozel)

S - Special Revision 7/18/84 t

CEhTRAL STATIONS - Fossil-Pueled and Ih'dro (1970-1984)

'nTE OF STATION 6 UNIT CABLE gtg Alabama Power Company Gaston 5 HLC Gorgas 10 HLCI J. Miller 1 6 2 11 L S Allegheny Power Company Harrison 1, 2, 3 C

Hatfield 3 HLC Baltimore Gas 6 Electric Ccmpany Brandon Shores 1, 2 L

Buckeye Rural Elec. Co-op, Inc.

Cardinal 3 L

Canal Electric Campany Canal 2 HL Central Illinois Light company Duck Creek 1 HLC Central Illinois Public Service Co.

Newton 1 HC Central South West Oklaunion L

Cincinnati Cas 6 Electric Company Miami Port 8 LC East Bend 2 H

City Utilities Co.

South West Power HC Colorado ITTE Yampa 1, 2 HLC Commonwealth Edison Company Collins 1, 2 3 HL State Line L

Consolidated Edison Co. of NY, Inc.

Astoria 6 HL Consumers Power Company Ludington (Hydro) 11 Karn 3, 4 L

Dallas Power 6 Light Company Monticello 1, 2 H

Dayton Power 4 Light Ccepany Stuart 1, 2, 3, 4 H

Delmarva Power 6 Light Company Edgemoor 5 L

Indian River 4 HL Detroit Edison Company Monroe-1, 2, 3, 4 HLCI Greenwood 1 LC Duke Power Company Belews Creek 1, 2 LC Cliffside 5 HLCI Jocassee 1, 2, 3, 4 (Hydro)

HLCI Riverbend C

Revision 7/18/84

CENIRAL STATIONS - Fossil-Fueled and Hydro (19701984)

Continued...Page #3 LTTILITY STATION 6 UNIT CABLE TYPE Nevada Power Corporation 50APA Station LC Northern States Power Company Blue Lake C

French Island LC Inver Hills LC Omaha Public Power District North Onaha HLC Nebraska City Station 11 L I Otter Tail Power Company Bigstone I LC Pacific Power 6 Light Company Jim Bridger C

Wyodak HL Centralia 2 H

Pennsylvania Power Company Brute blansfield HLC Pennsylvania Power 4 Light Co.

htartins Creek 3 LC Power Authority State of New York Astoria HL Potomac Electric Power Company Benning 1, 6 11 L C Dickerson 4, 5 L

Public Service of Colorado Comanche 2 C

Public Service of New llampshire Newington HL Seabrook H

Public Service of New Mexico San Juan 1, 2, 3, 4 HL Scmbber-1, 2 LCI Salt River Project Navajo I, 2, 3 HL San Antonio Public Service Sommers 2 CI Calaveras HLCI San Diego Gas 6 Electric Company Encina 4, S HL Savannah Electric 5 Power Company Effingham H

Seminole Electric Co-op Units 1 ( 2 LC South Carolina Electric 6 Gas Co.

Williams HLCI Fairfield 1 through 8 HLC Santee-Cooper Cro.ss Generating Sta. 2 HLC Southern Indiana Gas 6 Electric Culley

_C Southwest Electric Power Company Welch HLI Lee 5 H

Revision 7/18/84 I-

CENTRAL STATIONS - Nuclear-Fueled (1970 1984)

UTILITY STATION 6 UNIT CABLE TYPE Alabama Power Ccxnpany Farley 1, 2 HLC Arkansas Power 6 Light Company Russellville LC Baltimore Gas 6 Electric Calvert Cliffs L

Boston Edison Company Pilgrim 1 LC Carolina Power 6 Light Company Bmnswick 1, 2 11 L Robinson L

Central Maine Power Maine Yankee HL Cincinnati Gas 6 Electric Company Zimmer 1 LC Cleveland Electric Illuminating Co.

Perry 1, 2 C

Commonwealth Edi. ton Campany La Salle 1, 2 LC Byron 1, 2 HLC Praidwood 1, 2 HLC Dresdan 1, 2, 3 HLC Zion LC Quad Cities I

Detroit Edison Company Femi 2 LC Duke Power Company Oconce 1, 2, 3 11 L C I McGuire 1, 2 11 L C I Catawba 1, 2 11 L C I Cherokee 1 Duquesne Lighting Company-Beaver Valley 1 LC Beaver Valley 2 LCI Florida Power 6 Light Company Turkey Point 3, 4 11 L C I St. Luci 2 H

Manatee 1, 2 HLC Georgia Power Canpany llatch 1, 2 11 L C Vogtle 3, 2 HLC Gulf State Utilities Company River Bend 1, 2 LC Houston Lighting 6 Power Company South Texas Project HLC Illinois Power Company Clinton 1, 2 HLCI Indiana 6 Michigan Cook 1, 2 HL Iowa Electric Light G Power Co.

Arnold LC Korea Electric Company Korea Nuclear Units HLCI 5,6,7,8 Revision 7/18/84'

CINITAL STATIONS - Nucicar-Fueled (1970-1984) _

l

[JTILITY STATION 6 UNIT CABLE TYPE Texas Utilities Generating Company Comanche Peak 1, 2 11 L Toledo Edison Canpany Davis Besse 1 11 L Virginia Electric 6 Power Canpany North Anna 1, 2, 3, 4 11 L Surry 1, 2 C

Washington Public Power Supply System Nuclear Project 1, 2, 3 11 Wisconsin Michigan Power Point Beach 11 L Wisconsin Public Service Kcwaunce 1 L

Westinghous Electric Corporation Krsko Nuclear (Yugoslavia) 11 L C f

Revision 7/18/84

.

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