ML20128E887
| ML20128E887 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 11/30/1992 |
| From: | COMMONWEALTH EDISON CO. |
| To: | |
| Shared Package | |
| ML20128E886 | List: |
| References | |
| 92-001S, 92-1S, NUDOCS 9212080205 | |
| Download: ML20128E887 (127) | |
Text
{{#Wiki_filter:. .. _ . . . . .- ._ _. o-b f, ENVIRONMENTAL. QUALIFICATION OF OKONITE TAPE SPLICE (T 95/No. 35) UNDER LOCAL SUBMERGENCE FOR POWER AND CONTROL APPLICATIONS , 1 COMMGhWEALTII EDISON COMPANY DESIGN SUPPORT ENGINEFRING I400 OPUS PLACE DOWNERS GROVE, IL 60515
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- CALCULATION REPORT NO. 92-001S NOVEMBER 1992 9212080205 921121 6-DR _ADOCK 0500
=_ = __ g TABLE OF CONTENTS 1
1.0 Summary 2.0 Okonite Tape Splice Materials of Construction and Their Water 2 Absorption / Repellency Characteristics Okonite T-95 Insulating Tape 2 2.1 Okonite #35 Jacketing Tap: 2 2.2 Circuit Applications Where Okonite Tape is Used 2 3.0 4 4.0 Okonite Tape Splice Configurations Potential Failure Modes of the Splices 4 5,0 5 6.0 Postulated Worst Case Line Break Acciunt 5 7.0 Type Test Results 5 7.1 Summary of Appendix A Test Results Summary of Appendix B Test Results 7 7.2 Summary of Appendix C Test Results 7 7.3 8 7.4 Summary of Appendix D Test Results 8 _. 7.5 Overall Type Test Summary 8 8.0 Test Margins 9 9.0 Conclusion Appendix A Appendix B Appendix C Appendix D
Calculation Report No. 92-00lS Environmental Qualification e of Okonite Tape Splice , (T-95/No. 35) Under local Submergence For Power and Control Applications 1.0 Summary This evaluation demonstrates the environmental qualification for Okonite tape splices (T-95/No. 35) for local submergence conditions. Okonite tape splices are used in both " In Line (straight) and "V" type splice applications. The In-Line splices are used in power (4ky.600VAC/250VDC) and control applications (120VAC/125VDC). The "V" type splices are used in the same applications as the In-Line splices with the exception of 4kV power application. Okonite tape splices are not recommended by Commonwealth Edison for use in EQ related instrument loop applications, and therefore, are not used in instrument circuits. Under certain design basis accident conditions, Okonite tape splices could be exposed to the effects of a steam line break accident, and potentially, be locally submerged inside junction or pull boxes. The environmental qualification of the tape splices to 10CFR50.49 and NUREG-0588 Category I requirements was established by performing the following:
- Determine splice materials o construction and their water absorption / repellency characteristics
- Determme circuit applications where Okonite tape splices are used
- Evaluating splice configuration details based on their physical orientation within electrical boxes and within associated raceway configurations
- Determining the potential failure modes of the splices-
- Identifying the worst case postulated environmental conditions, including local submergence, that the splices could experience Once the as-installed configurations had been determined, these configurations were reviewed and compared to the tested configurations. The as-tested configurations were determined to be representative of the as-installed configurations which would experience postulated accident conditions in bo*.h inside and outside containment areas, typically in nuclear stations. Specific details of this evaluation are found in the following sections which support the overall basis for this acceptance.
Calculation Report No. 92-00lS 2.0 Okonite Tape Spilce Materials of Construction and Their Water Absorption / Repellency Characteristics 2.1 Okonite_T-95 Insulatine Tape The T-95 high voltage insulating tape is an ethylene-propylene based thermosetting polymer, it is designed as a high voltage, high temperature splicing tape, that is recommended for insulating splices and terminations on high voltage cables that are insulated with ethylene-propylene, butyl, oil base and thermoplastic and cross-linked polyethylene compounds. The insulation tape is similar to a true cable insulation or jacketing compound, formulated and designed for use with electric cable. The insulating tape has a dielectric strength of 600V/ mil. The insulating tapes' self-fusing capability (i.e.., the ability to self-unite as one homogeneous, void free mass), makes the tape layers mold into a completely solid material, similar to the cables' original insulation and jacket. In this condition, physically there are no layers which can delaminate; there is no adhesive to encourage " oozing," drying-out or unwrapping of the tape. The tape is heal and moisture resistant. The tape has a nominal thickness of 20 mils. In regard to moisture exposure, the tape is essentially non-hydroscopic as evidenced by its negligible gravimetric water absorption guaranteed value of 10 MG/SG.IN. maximum after 7 days
@ 70*C (ASTM D-470).
2.2 Okonite #35 Jacketine Tape The Okonite #35 jacketing tape is designed to provide mechanical protection to the T-95 splices for neoprene, plastic and other synthetic rubber-like cable jacket materials for all voltage applications. When wrapped, it fuses into a homogeneous, void free wall that ' has resistance to weathering elements such as rain, wind, and sun normally found in nature, is resistant to the splashings of moist oils, chemicals and acids and has good electrical properties (i.e., a dielectric strength of 500V/ mil.). 3.0 Circuit Applications Where Okonite Tape is Used As previously summarized the tape splices are used in both In-Line and "V" type splice applications. The In-Line splices are used u. power (4kV/600VAC/250VDC) and control applications (120VAC/125VDC). The "V" type splices are used in the same applications as the In-Line with the exception of 4kV power. (Accordingly no 4kV power splice connections are contained in junction or pull boxes.) In addition, no Okonite tape splices are used in EQ related instrt. ment loop applications.
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Calculation Report No. 92-001S 4.0 Okonite Tape Spilce Configurations Figure 1 depicts the typical electrical installation configurations which utilize Okonite tape splices. The differentjunction or pull boxes that are used for electrical installations, as shown in Figure 1, are typically gasketed and have a lip. The lip height for the box in Figure 1 is 3/8". By design, the gasket does not provide a scaling function against moisture / steam intrusion. Accordingly, the gasketed cover does not preclude the free exchange of steam / moisture between the inside and outside of Le box, Moisture is expected to enter the junction or pull box and accumulate up w but no more than the 3/8" depth. The source of moisture is from condensate originating from a postulated - steamline break accident. The quantity of moisture is expected to accumulate from the steam condensation that occurs inside the box and within associatM i~$nduits attached to the box, as well as from spray intrusion into the box through th; Meted cover. For boxes which do not have the capability for drainage, the total volume of condensate is limited to the lip height since any excess condensate is expected to flow out through the gasketed cover. As shown in Figure 1, the electrical installation configuration does not allow for the direct funnelling of condensate. 5.0 Potential Failure Modes of the Splices The Okonite tape splices provides a dielectric insulation function between conductor to ground (the metal body of the junction or pull box) and between conductor (phase) to conductor (phase). The splices also maintain circuit continuity. The T-95 tape insulation provides the dielectric insulation and the No. 35 jacketing tape provides the mechanical protection to the T-95 tape insulation. The thickness of the T-95 tape is 20 mils. Therefore the minimum dielectric breakdown that is the minimum voltage threshold value when flashover occurs of the T-95 tape splice (i.e.,600 volts / mil x 20 mils) is at least 12,000 volts. This dielectric capability provides a 2400 percent margin over the worst case 600 volt power and control application which is actually 480 VAC. In addition, since the installation procedures require a minimum two half-lapped Icyers of Okonite T-95 tape, this results in an installed minimum thickness of 40 mils. Accordingly, this provides an even higher actual value for the dielectric breakdown. Figure 2 shows the worst case configuration of the low voltage (i.e., 600 volts) power and control splice application. The dielectric leakage that may occur through the insulation is a function of temperature, applied voltage, insulation material and age of theinsulation material. Until degradation occurs which would result in a dielectric failure of the insulation material (i.e., T-95 tape), this leakage current will be small (i.e., in the order of 10 mA) which would not affect circuit function since the dielectric insulating capability of the tape is high. The other possible, but unlikely, leakage current is attributed to moisture / condensate
Calculation Report No. 92-00lS , This leakage current is penetrating betw en the cable insulation and the T-95 tape tape. This leakage current is possible only when the acceptable splice con deviated from and/or mechanical adhesion of the splicing tape to the cable insula occurs. This leakage current will be large since the leakage path only depends upo conductivity of the condersate and the path length between the bare metal insi splice and the ground plane. In fact this type of leakage will usually result a fuse which is electrically equivalent to a "short to ground." A properly installed s would, therefore, not experience this failure. 6.0 Postulated Worst Case Line Break Accident For inside containment applications, the enveloping accident pronle (all possible lin breaks) including demineralized / chemical spray are postulated. For outside cont applications, the enveloping accident profile for all possible line breaks exc are postulated. 7.0 Type Test Results Appendices A through D of this report describe environmental qualification 2.ddress the following: A Environmental Qualification of Okonite (600 V) In-Line and "V" Type Splices and (5kV) for Inside BWR/PWR Containment Applications. B Environmental Quali6 cation of Okonite 600V Power and Control Splices for Inside BWR Containment Application While Under " Local Submergence." C Environmental Qualincation of Okonite 600V Power and Control Splices for Inside PWR Containment Application While Under " local Submergence." D Environmental Quali3 cation of Okonite 600V Power and Control Splices for Outside Containment Applications for both PWR/BWR Stations While Under
" Local Submergence."
7.1 . Summary of Anoendix A Test Results The test results evaluated in Appendix A establish that the Okonite In-Line Splices and SkV) are environmentally qualified for inside BWR/PWR containment appl The splices maintained the 80V/ mil dielectric test under tao water after havine exposed to a 40-year end-of-life condition and the worst case enveloping BWR/PWR I l
Calculation Report No. 92-00lS
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Cable - V Okonite Spilce Leakage through Seapage: Is a function of construction . of splice and mechanical i adhesion of the splice to the Mi",3 :ijjj;;jj:':': - cable insulation, um :n jM ::"li!!::lli:i Wj: y l Leakage thros.gh Insulation {. I is a function ofinsulation
! Leakage throughInsulation: dielectric property and T
p thickness. Leakage through Seapage Figure 2: Leakage Path Under Submergence Calculation Report No. 92-001S inside containment accident orofile. The dielectric test under tap water established that Also the insulation the electrical circuit integrity of the splice had been maintained. ! resistance (IR) and dielectric tests performed prior to the accident exposure demonstrate that the Okonite tapes do not degrade their electrical characteristics during the norm 40 years installed life. This test estabOhes that the T-95/No. 35 splice is a qu material for the worst case envitonmer.t postulated at BWR/PWR nuclear plants. 7.2 Summary of Annendix B Test Results The test results evaluated in Appendix B establish that the Okonite 600V In-Line and "V type splice are environmentally qualified for inside BWR containment low volt power and control applications phen the solice maybe ohysically attached to the b surface of the iunction box that provides no drainage. The test results demonstrated that the In-Line and "V" type splice have the same electrical performance characteristics "V" type although their physical configurations are different (i.e., In-Line type vs , splices), in addition the test configuration in the test vessel allowed During direct impingem the test, of demineralized water spray and steam to enter the junction box. cpproximately 1/4" of water accumulated inside the junction box <esulting in spl being partially submerged. The splices continued to hold the apolied voltaee (532 and 132 VAC) and current (6.7 amps.15 amos) with no noticeable inkage current throuch out the entire DBE exoosure. 7.3 Sumnanry of Aooendix C Test Results ! The test results evaluated in Appendix C establish that both Okonite In-Line and "V" type splice are qualified for inside PWR containment low voltage power and co applications _when the specimens maybe ohysically attached to the bottom of a L switch compartment that mau not have drainage. The test results demonstrate that the In-Line and "V" type splice have the same electrical performance characteristics althoug l their physical configurations are different. The test established that the Okonite T-9 ' tape will maintain its electrical performance characteristics even without the No. 3 In addition the tested configuration allowed for the Limitorque switch jacketine taoe. compartment to be open inside the test vessel which allowed direct impingemen chemical spray and steam to enter the Limitorque switch companment. During the test approximately 1/2" of water accumulated inside the switch compartment resulting splices being partially submerged. The solices continued to hold the applied vol VAC and 137.5 VDC) with minimal leakace current-(i.e. 1.2 mA at 137.5 VD , throuchout the entire DBE exoosure. 4 Calculation Report No. 92-00lS 7.4 Sunttuary of Appendix D TesLikstills The test results evaluated in Appendix D establish that both the 600V Okonite In Line and "V" type splice are qualified for BWR/PWR outside containment low voltage power and control applications when the soccimens are physically attached to the bottom of the lunction box. The test results also demonstrated that the in-Line and "V" type splice have the same electrical performance characteristics although their physical configurations are different. The tested configuration allowed for the conduit run to the junction box to be left open inside the test vessel which allowed direct impingement of steam to enter the junction box. Durine the test approximatelv 3/8" of water inside the iunction box _ and the solices were partially submerced holdine the apolied accumulated voltage (305 V AC) with minimal leal; age current (i.e. 19 mA at 305 VAC) throughout the entire DBE exoosure. 7.5 Overall Type Test Summary The results from tests performed on different Okonite T-95/No. 35 In-Line and "V" type splices specimens demonstrates that these splices are environmentally qualified for both inside/outside containment application which includes postulated worst case " local submergence" conditions when the splices are in the unlikely condition of being physically attached to the bottom of the junction box for low voltage (600 VAC) power and control applications. This qualification is in compliance with 10CFR50.49, NUREG-0588, Category I and IEEE 323-1974 requirements. 8.0 Test Margins In a postulated steam line break accident, steam is expected to penetrate all unsealed boxes. However, the line break is isolated within minutes, thereby eliminating the constant source of steam. Similarly, the chemical / demineralized water spray is terminated after a few minutes to hours after the postulated accident inside the containment. Therefore, after the steam line break and/or spray has been terminated, the amount of condensate inside the boxes will decrease and subsequently evaporate during the post accident duration. The tested configurations with the open conduit run inside the test vessel allows for the conservative direct intrusion of steam / spray into the box. This is typically not the case for in-plant configurations since the entire raceway system is closed, with the exception As of the cable tray, but it conservatively envelopes the in-plant configurations. described above, steam was injected continuously during the entire test duration and spray for the specified duration (46 hrs. to 72 hrs.), in compliance with the station required spray durations. Therefore, the constant steam injection to the test vessel, and
Calculation Report No. 92-00lS as a result, the increased inventory of water, is more conservative with respect to the postulated accident scenario. The test configuration is more conservative than actual conditions which would be experienced during a postulated accident for both inside or outside containment applications. As previously stated, the amount of condensate inside the boxes is expected to be limited by the lip height, subsequently, any excess volume of condensate exceeding this height does not degrade the qualification of the splices submerged by the condensate. This was indeed experienced in all the tests run for boxes without adequate drainage. All the tests described in Appendices B. C and D resulted in minimal leakage current h less than 19 mA at 305 VAC). This amount ofleakage current is not sufficient to malfunction a power / control device or " blow" a fuse. The measured leakage current of 19 mA at 305 VAC (Appendix D)is electrically equivalent to 7.8 mA at 125 VDC. This leakage current is_less than 10% of load current of tvoical control devices. Therefore, this leakage current will not be capable of malfunctioning control devices; As described earlier in Section 5.0, the leakage due to lack of mechanical bonding between the cable insulation and the T-95 tape is not expected to occur to result in a short circuit. Therefore, the leakage under " local submergence" for the Okonite law voltage splice would occur through the insulation (i.e., T-95) tape and not due to lack of mechanical bonding between the cable insulation and the T-95 tape. The splices were partially submerged due to the quantity of water trapped inside the box which was limited by the lip height. This is representative of that which would be fully submerged. The electrical circuit integrity continues to be maintained because in either case, the splices do not degrade their mechanical bonding capability. This is due to the fact that all the partially submerged specimens maintained their circuit integrity which is representative of a fully submerged condition. Considering the sample size (more than 20 test samples), if there was a mechanical bonding problem, if would have been identified. Since the tape is uniformly applied, the mechanical bonding characteristics would not behave differently irrespective of mechanical bonding occuring above or below the level of submergence. 9.0 Conclusion As discussed in Section 8.0, the leakage under " local submergence" for the low voltage power and control splices is due to the dielectric insulation property cf the T-95 tape and the dielectric insulation property is acceptable. As shown in Section 7.0 and 8.0, the tested accident profile is more severe than the postulated DBE profiles in the BWR/PWR nuclear plants, and is therefore, enveloping the DBE conditions. In Appendices B, C and D, environmental qualification of low voltage power and control splices under " local submergence" is demonstrated. Therefore, the low voltage power and control Okonite tape splices are environmentally qualified under " local submergence" due to a postulated 9
Calculation Report No. 92-001S line break per 10CFR50.49, NUREG-0588, Category I, and IEEE 323-1974 requirements,
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Calculation Report No. 92-001S Apsa1111.A A0 Environmental Qualification of Okonite In-Line and "V" Type Splices (600 V) and In-Line Splice (SkV) for Inside BWR/PWR Containment Application A.1 Purpose The purpose of this section is to summarize the environmental qualification of Okonite EPR insulated In-line and "V" type splice assemblies consisting of Okonite T-95 insulating tape, No. 35 jacket tape and T-95 nuclear grade cement for 600 V power and control and SkV pmver applications, to perform their intended safety-related functions during the normal service and DBE/ Post-DBE conditions in accordance with 10 CFR 50.49, NUREG-0588 Category I, IEEE 323-1974, and IEEE 383-1974 requirements. A.2 References A.2.1 Okonite Engineering Report 407, "LOCA Qualification of 600 Volt Splices," Rev. None, dated 01-21-85 A.2.2 Okonite Report NQRN-3, " Nuclear Environmental Qualification Report for - Okoguard Insulated Cables and T-95 and No. 35 Splicing Tapes," Rev. 04, dated 10-24-88 A 2.3 Okonite Splicing Instructions / Drawings A.2.4 Okonite Company Form G-3, " Qualification of Okoguard Ethylene Propylene Rubber Insulation for Nuclear Plant Service," dated 06-28-79 A.3 Specimen Tested A.3.1 Okonite 660 V In-Line Splices The test specimens used in the qualification test of Okonite 600 volt in-Line splices were configured as described below (Ref. A.2.1, Para,1.4.1.1, Page 1): Four 7 ft, samples: 2 non-aged,2 thermally aged (Drawing D11845, Ref.- A.2.1) Cable Description - 2kV A/C #6 7X AC, insulated with extruded 0.055: Okonite (EPR) and 0.030" Okolon (CSPE), 90*C rated' conductor temperature with 130*C overload rating. A-1
Calculation Report No. 92-00lS Splice - In Line (straight) splice utilizing Okonite T-95 and No. 35 tape and T-95 cement constructed per Okonite Instruction in Appendix 1, Reference A.2.1. This configuration used a 2kV rated cable. However, the splices made are 600V splices. Therefore, all thicknesses are based on 600 V cable (see Page 2 of Ref. A.2.1). A.3.2 Okonite SkV In-Line Splices The test specimens used in the qualification test of Okonite 5kV In-Line splices were configured as described below (Ref. A.2.2, Para.1.4.1.1, Page 3): Two 15 ft. cable samples: one non-aged, one thermally aged Cable Description - SkV, #6, 7X BC, extruded semicon, 0.090" Okoguard extruded semicon,0.005" x 1" BC shielding tape,121/2% lap, no jacket. Splice - In-Line (straight) splice using T-95 and No. 35 tapes and T-95 cement constructed as shown in Appendix 1 of Reference A.2.2,
-Drawing 11489 with the following exceptions:
Test Configuration Conditions:
- The specimen cable had no jacket. However, jacketing tape No. 35 was applied over the splice.
- Grounding straps and tinned copper perforated strips were not used.
- A compression connector was used in lieu of a solder connection.
A-2
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Calculation Report No. 92-00lS A.4 Similarity Analysis The subject Okonite In-line splices are installed in various Class IE low voltage power and control, and medium voltage power circuits. The splices tested in References A.2.1 and A.2.2 were single conductor In-line splices s'Mtable for Okonite/Okoguard (EPR) insulated and Okolon jacketed cables. Per Reference A.2.3, multi-conductor splice configuration utilizes the identical Okonite T-95 insulating and No. 35 jacketing tapes and T-95 cement which were tested in References A.2,1 and A.2.2 qualification reports. It should be noted that Okonite utilizes the same tapes for both 600V power and control and SkV power applications (see Page 2 of Reference A.2.4). Also multi-conductor splices have an additional layer of protective splicing tape applied over the entire splices which provides even greater protection the against external environment. Therefore, qualification applies to both single and multi conductor in-line splices constructed using Okonite instruction / drawings. The "V" type splices for low voltage power (600 VAC/250 VDC) and control (125 VDC,120 VAC) use the same material except that the splice is a back-to back bolted connection. Therefore, qualification of these splices are established by the qualification of In-line 600V splices. Qualification for the configuration of "V" type splice is established in Appendix B. A.5 Splice Qualified
- a. Okonite Company Drawing 11485, Rev.1, Instructions for straight splice for 600 V single conductor Okonite insulated, Okolon jacketed, non shielded nuclear station cable,
- b. Okonite Company Drawing 11492, Rev. B, Drawing for straight splice for 600 V multi-conductor Okonite insulated, Okolon jacket and overall Okolon jacket, nuclear station cable.
- c. Okonite Company Drawing 11489, Rev. B, Drawing for straight splice for single conductor SkV Okoguard insulated, Okolon jacketed, shielded nuclear station cable,
- d. Okonite Company Drawing 11559, Rev, A, Instructions for straight splice for SkV, multi-conductor Okonite insulated, Okolon jacket nuclear station cable.
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Calculation Repon No. 92-00lS A6 Failure Mcdc Analysis Activation Energy Safety Failure Item Construction Basis Value Ref. Function Mode (eV) A.2.1 Retention Provide Insulation Insulating Okonite T-95 1.089 A.2.2 of Electrical that Tape Causes a Elongation Insulation [EPR Based Loss of Thermosetting and Environ- Circuit Compound) mental Integrity Seal Necessary to Protect Circuit Integrity Jacketing Okonite Tape No. 35 (Neoprene) 1 Adhesive Okonite T-95 Cement ,
- Jacketing tape No. 35 is used for mechanical protection and provides fire retardant properties. This tape is not used to provide insulation and hence, no credit is given for environmental qualification.
** The cement used in the splice is also an EPR compound in adhesive form. Once the cement is dry, both tape and cement have the same chemical structure and are rated for continuous service of 90*C, Therefore, the safety function and failure mode are the same for both the cement and the T-95 insulating tape.
A-4
Calculation Report No. 92-001S A.7 Test Sequence The subject Okonite 600 V and _5kV In line splices were type tested in accordan with the test sequence of IEEE 3231974 and IEEE 383-1974 (Para.1.4.1.5, Page Ref. A.2.1, and Para.1.4.1.5, Pages 4 and 5, Ref A.2.2). Additional electrical and mechanical tests in excess of the requireme sts of IEEE 323-1974 and/or IEEE 3 1974 were also performed. Thermal Aging and Quallfled Life Evaluation Component aging is based on the organic materials used in the construction Okonite In-line splices. Thermal aging follows an Arrh.nius relationship of the for c ,,exp t,,,= L set [ age . Where: t, = Duration of aging in hours y t,,, = Duration of service in hours (i.e., qualified life) T,, = Aging temperature (*K) T., = Service temperature (*K) . k = Boltzmann's Constant (8.617 x 10-5 eV/*K) 4 = Activation energy (eV) The tested In-line splice configurations (600 V and SkV) utilize Okonite T-95 tape a the primary insulation. Therefore, it is the limiting factor for splice degrada Okonite No. 35 jacketing tape is used only for mechanical protection and is not included as the basis for qualification. The T-95 insulating tape is an EPR base material. The EPR base in T-95 tape is similar to the EPR in trie other Okonite insulations which are thermoset materials (i.e., cable insulation), thereby aging characteristics are expected to be essentially the same. Based on this similarity, activation energy of T-95 tape is 1.089eV. Using the Arrhenius equation, the qualified life of the Okonite T-95 splicin determined by utilizing the above calculated activation energy, the test specimen thermal aging data, and the maximum normal ambient temperature of any nuc station. Per References A.2.1 and A.2.2 (Paragraph 1.4.1.3), the test specimens were-A-5
Calculation Report No. 92-001S l thermally aged for 3 weeks (504 hours) at 150'C temperature. Substituting into the Arrhenius equation yields the following qualified life: 1.089 1 _ 1_ j c*" = 504 exp , 8. 617 x 10 5 /[346.88 423[
= 354604.13 hours @ 165'F (346.88*K)
= 40.45 years @ 16 5' F (3 4 6 . 8 8' K)
At 165'F (73.88'C), the thermal aging as shown above, results in an equivalent qualified life of at least 40 years. However, the subject Okonite splices require qualification t t 90'C conductor temperature which includes heat rise. Append Refererices A.2.1 and A.2.2, demcnstrates the qualitication of Okonite EPR insulation at 90*C conductor temperature for a qualified life of 40 years. A.8 Radiation Aging The test specimens (600 V and SkV In-line splices) were irradiated in a Cobalt-60 field of gamma radiation to a minimum total integrated dost (TID) of 2.00 x 10' rad at a dose rate of less than 1 x 10' rads / hour (Appendix 4, Ref. A.2.1 and appendix-3, Ref. A.2.2). This dose rate meets IEEE 383-1974, Section 2.3.3.3 requirement. The TID requirement for CECO's PWR and BWR plants for 40 years normal and 1 year accident operation is 2 x 10' rads of gamma radiation, which includes th as required by IEEE 323-1974. Therefore, the radiation test parameters envelop the TID requirement for all six CECO , stations. A.9 DBE (LOCA Exposure) Evaluation Test LOCA Profile (600 V Ir.-line Splices) 335 315 265 212 Temperature ( F) : 346 4 hrs. 81 hrs. - 3,024 hrs.
- 3 hrs. 3 hrs.
Duration 101 76 26 0 Pressure (psig) : 116 Steam Steam Steam /100% Steam /1007 Rel. Humidity (%) : Steam The initial peak of 346*F for 3 hour:: provides additional vrgin to the postulated DBE profile. The test parameters shown above are actual test data per Append A-6
Calculation Report No. 92-001S Reference A.2.1. This test profile and chemical spray envelops the worst case postulated DBE for inside containment application. Test LOCA Profile (SkV In-Line Splices) 335 316 265 212 Temperature (*F) : 335 3 hrs. 4 hrs. 82 hrs. 3,021 hrs. Duration : 3 hrs. 114 101 74 26 0-2 Pressure (psig) : 100 100 100 100 Rel. Humidity (%) : 100 The initial peak of 345'F for 3 hours is used as additional margin. The test parameters shown above are actual test data per Reference A.2.2, Figure 1 of Appendix 4~. This test o' profil: and chemical spray envelops the worst case postulated DBE for all CECO mtion inside containment application. A.10 Electrical Integrity Per Paragraph 1.4.2.4 (Ref. A.2.1 and Ref. A.2.2), throughout the LOCA exposure the Okonite In line splice specimens were energized with their respective rated voltage of 600 V and 5kV and loaded with 80 amps initially. As the temperature changed, the current was re-adjusted to maintain 80 amps. Insulation resistance measurements were performed periodically. All samples passed tests as described in Paragraph 1.4.3 of Reference A.2 and Reference A.2.2. All samples maintained the electrical load throughout the entire profile. A.12 Performance Test / Acceptance Criteria The acceptance criteria for the subject Okonite In-line splices is that they must be able to maintain the rated load throughout the entire LOCA profile, and must withstand a post-LOCA voltage withstand test as outlined in Section 2.4.4 of IEEE 383-1974. A.13 High Voltage Withstand Test (Hi-Pot.) At the conclusion of 30-day and 130-day post-LOCA simulation, the test specimens (i.e., cables including splicing tapes) were straigStened and wound around a mandrel at 40 times of cable diameter, and immersed in water. The test specimens passed the high voltage w;thstand test for 5 minutes at 80 VAC/ mil, while immersed in the water per IEEE 383-1974, Section 2.4.4 [ Para 1.4.1.6 (b), Ref. A,2.1 and A.2.2]. A-7
Calculation Report No. 92-00lS A.14 Conclusion i Based on the test results and the evaluation presented above, it is concluded that the t)konite !n-line splice tapes are environmentally qualified for power (4kV,600 VAC, 250 VDC) and control (120 VAC,125 VDC) and "V" type splices are qualified for power (600 VAC,250 VDC) and control (120 VAC,125 VDC) application for all nuclear stations. 1 A-8
Calculation Report No. 92-001S Appendix B B.O Environmental Qualllication of Okonite 600V Power and Control Splices Inside BWR Containment While Under " Local Submergence" B.1 Purpose The purpose of this section is to establish environmental qualification of Okoni line and "V" type splice (consisting of Okonite T-95 insulating tape and No. 35 jacketing tape) under " local submergence" for insi B.2 References B.2.1 Cable Termination, CECO Instruction No. WI-500, Rev.10 1 B.2.2 Wyle Test Report #17856-2, " Environmental Qualification of Okonite Tape
'V' Splices," dated 09-09-86 B.2.3 Wyle Test Report #17856-3, " Environmental Qualification of Okonite Taped
'V' Splices, Phases 2, " dated 09-12-86 B.3 Splice Configurations Each specimen consisted of two individual wires, each erproximately 10"-15" lon spliced with various types of crimped ring-torque terminals bolted together b back. The test specimens were assembled using various configurations of Okonit tapes applied over the splices:
1. Specimens l A, IB, IC, 7A,7B, and 7C (Zero overlap), Figure B.1 a. One length each of Okonite #14 AWG and Thermofit wire were used for these splices, b. Okonite Nuclear Splicing Cement was applied to areas of the splices which are to be taped. c. Two half-lapped layers of Okonite T-95 tape were applied, starting the wrap just past the edge of the lug touching the conductor insulation, proceeding over the bolted splice and returning to the starting point of the wrap. d. Two half-lapped layers of Okonite No. 35 jacketing tape were applied over the T-95 tape, starting at point %" past the end of the splicing lug over the conductor insulation, proceeding over the splices and returning to the staning point of the wrap. B-1 l
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- e. The splices was constructed accordance with Reference B.2.1 procedure.
- 2. Specimens 2A, 2B, 2C, 8A, 8B, and 8C (%" overlap), Figure B.2
- a. Steps la. and Ib. were repeated.
- b. Two half-lapped layers of Okonite T-95 tape, starting the wrap %" past the end of the lug, proceeding over the bolted splice and returning to the starting point of the wrap.
- c. Steps Id. and le, were repeated.
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- 2 F:,gure B.21 Specimons 2A, 25, 2C, 8A, 85, SC m
Calculation Report No. 92-00lS
- 3. Specimens 3A,3B, and 3C (%" overlap), Figure B.3 a.
Two lengths of Okonite #2 AWG wire were used for these splices,
- b. Step lb, was repeated.
- c. Single layer of Okonite T-95 tape was applied starting %" past the lug and proceeding to the splice. Additionallayers were applied over the boit connection for softening.
- d. Steps Id. and le, were repeated.
- 4. Specimens 4A,4B, and 4C (3/4" overlap), Figure B.4
- a. Steps la. and Ib. were repeated,
- b. Step 3c was repeated, except start the wrap 3/4" past the end of the splicing lug instead of %" past the end.
- c. Steps la. and Ib. were repeated.
- 5. Specimens SA,5B, and 5C (0" overlap), Figure B.5 a.
Two lengths of Okonite #14 AWG wire were used for these specimens.
- b. Step lb through le. were repeated.
- 6. Specimens 6A,6B, and 6C (W" overlap), Figure B.6- .
- a. Step 5a. was repeated.
- b. Step lb, was repeated.
- c. Step 2b. was repeated.
- d. Steps Id. and le. were repeated.
These specimens were prepared using the same construction as that of installed at ; aSalle County Station (LSCS). B-5
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Calculation Report No. 92 00lS B.4 Test Sequence The LOCA test was performed in two phases. All specimens listed above went through the first phase of testing. In addition, specimens 4A,4B, SC,6A,6B 6C went through the second phase of testing.
- a. First Phase Sequence (Reference B.2.2)
- Inspection and specimen preparation
- Functional test
- Accident simulation (24 hours)
- Functional test
- Post test it spection
- b. Second Phase Sequence (Reference B.2.3)
- Inspection
- Functional test
- Accident simulation (72 hours)
- Functional test
- Post test inspection B.5 Mounting and Orientation of Specimens
- a. The specimens were mounted in two NEMA 12 enclosures. Specimens C through 6A, B, C were mounted in enclosure #1. Specimens 7A, B, C -
8A, B, C were mounted in enclosure #2. The difference between these two enclosures is that enclosure #2 had a %" weep hole in its bottom (Figure B.7 The specimens locations inside the enclosures were as follows (Photogra B.1 and B.2):
- The ' A' specimens located at bottoms of enclosures.
- The 'B' specimens located at sides of enclosures.
- The 'C' .ipecimens suspended at random inside of enclosures.
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Calculation Report No. 92 001S b. Flexible conduits were entered the top of each enclosure from pu enclosures were inserted into LOCA chamber. 4 B.6 Electrical Powering and Monitoring a. The following table illustrates the powering of these specimens (
,Yoltace' VAC Circuit Current Amp,3 Snedmen No.
Ha 1 6.7 528 I A, IB,1C 528 2 2A,2B,2C 6.7 3 15 528 3A,3D,3C 528 4 15 4A,4D,4C 132 5 5A, SD, SC 6.7 6 6.7 132 6A,6D,6C 528 7 7A,78,7C 6.7 8 6.7 528 8A,8D,8C
'528 V AC (+ 10, -0 VAC) 132 VAC ( +5, -0 VAC) b.
All circuits input voltage and current were monitored as well as cha pressure, temperature, and water flow. B.7 LOCA Test a. Numerous testing perfortned on Okonite tape splices conclude: 1. The tapes went through numerous testing in both "V" and In-l configurations, having passed the tests successfully.
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2. Failure of the splices may occur only in conditions of high tempen.tl and humidity. r j Based on these findings, only a LOCA accident simulation test w j This test was performed to verify tapes used in splice "V" configu under extreme conditions of temperature / humidity and " local su will pass the test. I b. After visual inspection,' the specimens were submitted to the functio The test consisted of measurement of insulation resistance (IR) b 500 VDC for a minimum of 1 minutet prior to measurement of the between conductor and ground, at ambient temperature after the were installed in the test chamber. 1 B 13 l
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Calculation Report No. 92 00lS
- c. LOCA Test Pronle The LOCA test profile was as follows (Figures B.9 and B.10):
Pressure Temperature Duration osie _ llumidity
*F _ Hours _
Steam 49.5 3 355 Steam 49.5 3 Phase 1 320 Steam Saturation 18 250 Pressure Steam Saturation 72 Phase 2 266 Pressure Demineralized water spray at 15 gal / min /ft' for the last 72 hours. NOTE: Only Specimens SA, B, C, and 6A, B, C were monitored during P the test (Photographs B.3 and B.4), d. All the test specimens maintained the voltage and current throughout th hour LOCA exposure (Pages III 28 through 11137 of Reference B.2.2 Pages 111-28 through 11132 of Reference B.2.3). e. Visual inspection was performed upon the test completion. No signs of t specimens damage or degradatior. were found (Photographs B.5 f. The test specimens complied with specified acceptance criteria, without exception, during and after the test. 1 B-14
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SPECIMENS 1A,18,1C THROUGH 6A, 6B, 6C AFTER TEST A n i 0 B 20 a
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i t Calculation Report No. 92-001S f B.8 I'ost. Test Inspection Following Phase 2 of this program, the specimens were removed and visually inspected. There was a light coat of white and brown resid all surfaces of the specimens. There was approximately 1/4" of water 12 enclosure (there was no provision for a drain of condensate). All tl were damp to the touch (Photographs B.8 and B.9). The NEMA-12 enclosure only accumulated 1/4" of water confirming tha of the water inside the enclosed is limited by the lip height. The "V" type , maintained their circuit integrity under the " local submergence" inside th ' i enclosure. B.9 Conclusion The LOCA tests performed (References B.2.2 and B.2.3) establish th splices for low voltage power and control application are envir will maintain their circuit integrity even when locally submerged due to con i from steam /demincralized water spray exposure, e F b h 1 f-1 + 1
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$PECIMENS FOLLWING ACCIDENT TEST B-22
Calculation Report No. 92-001S Appendix C C.0 Environmental Qualillcation of Okonite 600Y Power and Control Spilces Inside PWR Containment While Under " Local Submergence" C.1 Purpose The purpose of this section is to establish environmental qualification of 600V power and control Okonite In line and "V" type splice (consisting of Okonite T 95 insulating tape and No. 35 splicing tape) under " local submergence" for inside PWR containment applications. C.2 References C.2.1. Wyle Test Report No. 17947-01, " Qualification Test Program on Splices Fabricated with 3M Scotch Super 33+ Vinyl Plastic Electrical Tape and Okonite Splicing Tapes No. 35 and T-95 for the Alabama Power Company for Use in the Parley Nuclear Generating Stations," dated October 8,1987 C.3 Test Specimen Description The test specimens consisted of 14 different splice constructions as listed below. Three of each specimen were built (4 of Specimen 10) with the XX.1 specimens undergoing the full test sequence. The XX.2 and XX.3 specimens were spares wh were aged and irradiated but were not subjected to the LOCA test. The test specime were constructed by Wyle Laboratories' technicians using materials provided by the Parley Nuclear Generating Station and under the supervision of Alabama Power company technical representatives. Splice" Test Test Specimen Voltage Current Configuration" OverJan No. Cabic_Sinfi) NTO2 1/2" 633 VAC 27A 1.1, 1.2, 1.3 + 1/0 to 1/0 AWG 27A NTO3 3/4" 633 VAC 2.1, 2.2, 2.3 + 1/0 to 2/0 AWG NTO6 l' 633 VAC 27n 3.1, 3.2, 3.3 + 1/0 to 8 AWG ' VTO2 1/2" 633 VAC 130A 4.1, 4.2, 4.3 + 2/0 to 2/0 AWG VTO3 3/4" 633 VAC 130A 5.1, 5.2, 5.3 + 2/0 to 2/0 AWG VTO6 1" 633 VAC 130A 6.1, 6.2, 6.3 + 2/0 to 1/0 AWG TO2 1/2" 633 VAC 20A , 7.1, 7.2, 7.3 1/0 to 12 AWG TO3 3/4" 633 VAC 20A 8.1, 8.2, 8.3 8 to 8 AWG 20A TO6 1" 633 VAC 9.1, 9.2, 9.3 8 to 12 AWG NTO1 1/4" 137.5 VDC 200mA "* 10.l A,10.lB, 12 AWG to ASCO ' 10.2, 10.3 Lead C-1
Calculation Report No. 92 00lS Splice" Test Test Specimen Current Configumtion* Overlan Voltage No. _ Cable Size (s) VTol 1/4" 137.5 VDC 200 mA*" 11.1, 11.2, 11.3 12 AWG to ASCO lead 1/4" 137.5 VDC 200 mA*" TO! 12.1, 12.2, 12.3 12 AWG to ASCO Lead 137.5 VDC 200 mA*" NO3 3/4* 13.1, 13.2, 13.3 12 AWO to ASCO Lead 1" 137.5 VDC 200 mA"* N06 14.1, 14.2, 14.3 12 AWG to ASCO Lead Notes:
+ Specimens 16 will be dropped from further discussi^n as the inside an enclosure with adequate drainage.
T= OKONITE T-95 Insulating Tape. Applied in 2 half lapped layers. N= OKONITE No. 35 Jacketing Tape. Applied in 2 half lapped layers over T 95 tape. V= 3M Scotch Super No. 33+ Vinyl Jacketing Tape. Applied in 2 half lapped layers over T-95 tape. Overlap refers to distance from end of lug was applied 1/2" beyond the end of the T-95 tape. Circuit load was an ASCO 125 VDC Solenoid Mode Watt provided to Wyle from Farley Nuclear Generating Station. C2
- . = _ . . . - . . . . _
L Calculation Report No. 92-001S C.4 Test Specimen Preparation (Figures C.1 through C,9) All of the materials required to prepare the test specimens were provided to Wyl Laborttories from ihe Parley Nuclear Generating Station (FNGS) stock. Wyle technicians assembled the test specimens under the supe vision and guidance on site Alabama Power company technical representatives The completed assem were approved by Alabama Power company representatives prior to comme testing. The following procedures were followed in the assembly of the test specimens: 1. 18 inch pieces of the following cable sizes were cut form the cable provided Wyle Laboratories. For the Main Steam Room specimens (Specimens 1 to 14.3) the ASCO leads were approximately 912 inches and were cut off ASCO solenoid coils provided from FNGS. Specimen
- Lead 2" Numbers _ Lead 1" 1/C 1/0 AWG 1/C 12 AWO 7.1, 7.2, 7.3 1/C 8 AWG 8.1,8.2,8.3 1/C 8 AWG 1/C 8 AWG 1/C 12 AWG 9.1, 9.2, 9.3 1/C 18 AWG ASCO Lead"*
- 10. l A,10. lD,10.2,10.3 1/C 12 AWG 1/C 12 AWG 1/C 18 AWG ASCO Lead"*
11.1, 11.2, 11.3 1/C 18 AWG ASCO Lead"* 12.1, 12.2, 12.3 1/C 12 AWG 1/C 12 AWG 1/C 18 AWG ASCO Lead"* 13.1, 13.2, 13.3 1/C 18 AWG ASCO Lead *" 14.1, 14.2, 14.3 1/C 12 AWG
- Three identical specimens of each type (4 for Specimen 10) were assembled.
The intent was to test the XX.1 specimen with the XX.2 and XX.3 as spares. ,
" Cable stgplied to Wyle was 1/C 1000 VAC, Okonite (EP)-CSPE Cu cable.
The FNGS cable codes were 1/C 12 AWG-JA2,1/C 8 AWG JO4,1/C 1/0 AWG JO8, and 1/C 2/0 AWG JO9.
"* The glass braid on these leads was pushed back or cut back as the splice prepared.
- 2. An appropriate size compression lug was attached to each end of the above wires. The Burndy lugs were supplied from FNGS and crimped with a Wyle Burndy crimping tool.
- 3. The lugs were joined using copper or stainless steel hardware.
4. The Okonite T-95 insuladng tapes was applied over the bolt and lug arca to a thickness where no sharp edges could be felt. The T-95 tape was tensioned C-3 i
- - - - - _ - _ _ _ _ _ - _ _ _ - - _ _ _ _ _ _ _ - - - - _ ---___L
Calculation Report No. 92-001S ' approximately 75% of its initial width as it was applied. 5. Ok(, nite T-95 insulating tape (Specimens 712) or Okonite No. 35 tape (Specimens 13 and 14) was applied to the cable insulation in two half layers to the overlaps listed below. These overlaps were mounted fro end of the cable insulation and not the end of the lug. It should be noted tha no attempt was mad: to clean the cable surfaces during assembly. This w fe;t to be the most conseavative approach with respect to adhesion of the tap The T-95 of No. 35 tape was tensioned to 75% of its initial width as it was applied. Spcimen Overlap NGmbers Distance 7 1/2" 8 3/4" 9 1" 10 1/4" 11 1/4" 12 1/4 13 3/4" 14 1" 6. Okonite No. 35 or 3M Scotch 33+ jacketing tapes were applied over the Okonite T 95 tape to the following listed overlap distances. These tapes were also tensioned to 75% of their initial width prior to application. Specimen Type of Jacketine Taos Overlao Numbera None N/A 7 None N/A 8 None N/A 9 1/2" 10 Okonite No. 35 3M Scotch Super 33+ 1/2" - 11 None N/A 12 None N/A 13 None N/A 14
- 7. Specimens 10.l A and 10.1B.10.2 and 10.3,11.1 and 12.1,11.2 and 1 11.3 and 12.3,13.1 and 14.1,13.2 and 14.2, and 13.3 and 14.3 were mounted inside 3/4 inch Type C condulet fittings. The leads were routed s that the 18 AWG ASCO wires penetrated one end of the condulet and the .
12 AWG wires penetrated the other end. The 8 condulets were tie wrapped a 33" L x 30" W x 4" H ladder rung cable tray for handling during the radiation exposure. C-4
Calculation Report No. 92 00lS 8. Specimens 7.1,8,1 and 9.1 were rnountedh in at 12" W x 36 tray for Baseline Functional tests and radiation exposure only F aging and tae LOCA Te>i, they wer: inside the housing of a Li actuator. C5 Test Sequence The test program consisted of the following test sequence:
- Receiving inspection 0 Specimen Preparation
- Baseline Fun::iona! Test
- Radiation Exposure
- Functional Test
- Thermal Aging
- Functional Test
- Accident Simulation
- Post-Test inspection C-5
Calculation Report No. 92@lS (2) half lapped layers of Okontta T-95 3
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Calculation Report No. 92-001S Sa' Anb k.Lt.6 AM Stufb NIGl T 95 7"& ~O E UA>11c Snt00TW t%D ADU^)b SHAPE 47%.rt4Ss STEGc ~ g nr1, B 5 5 ] g nCDMpefdw) D e s t. r . DVbJ11~s C%tnGNf' 00Cf huqS Ulss AuD TAMD LAyG2S. ftso jg rM &Ap B Lcr n ] G E N c s q c 3 -g. [' 'l ( M '; 12 A4 i
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C-14
Calculation Report No. 92-001S C.6 Thermal Aging The test specimens, mounted in their respective tray, condulet or enclosure, were placed inside two medium sized test chambers and aged as described below, specimens 7.1, 8.1, and 9.1 were removed from the cable tray and mounted to a - Limitorque actuator fixture. Specimen Aging Time No. Temocrature (Hours) 7.1, 8.1 a'.J 9.1 Il0*C 114 10.l A to 10.3 110*C 112 11.1 to 12.3 Il0*C 110 13.1 to 14.3 150*C 253 C.7 Radiation Aging The test specimens were indicated to a TID of 22 Megarads. C.8 Loss of Coolant Accident Test C.8.1 Test Specimen Preparation The test specimens scheduled for the LOCA Test (Specimens 7.1, 8.1,9.1, 10.l A,10.1B,11.1,12.1,13.1, and 14.1) were removed from the enclosures used to age the specimens and train the wiring. The specimen leads were connected to Wyle-supplied 1/C Teflon-insulated leads through splices insulated with Raychem nuclear insulating sleeves as indicated below: Specimen Specimen Wyle Test
- Rnychem WCSF-N No. Lead Size (s) _ Lead Size - Sleeves Used **
7.1 1/0 A W G 10 AWG 115/300 w/500 12 AWG 10 AWG 070 w/200 8.1 8AW3 10 AWG 115 w/200 8AWG 10 AWG 115 w/200 9.1 8AWG 10 AWG 115 w/200 12 'AWG 10 AWG 070 w/200 10-14 ASCO 14 AWG 050 w/ll5 12 AWG 14 .sW G 070-C-15
Calculation Report No. 92-00lS Wyle leads were 1/C 1000 Volts,200*C, Teflon leads (10 AWG and 2 AWG) and 1/C 600 Volts, 200*C, Teflon (14 AWG). Indicates shim sizes applied to smaller cable and overall sleeve size. For example, "115/300 w/500" indicates WCSF-N-115 and 300 sleeves over the Wyle 10 AWG and an overall sleeve of WCSF-N-500 applied over the shims and the 1/0 AWG test specimen lead. Indicates that Okonite T-95 tape was applied over the sharp edges of the bolted connection, all other connections used uninsulated butt splices. After splicing to the Wyle test leads, the specimens wei re-installed in their enclosures as noted below: Soecimen No. Enclosure Tyre 7.1, 8.1 and 9.1 15%" x 10%" x 8%" Limitorque cover bolted to a %" thick steel plate, the Limitorque gasket was installed and there was no drain in the cover. The s,ximens were routed through a 1%-inch Myers hub and 90* elbow pointed downward. The splice rested on the cover approximately M inch below the bottom of the conduit entry (Figure C.10),
- 10. l A,10.1 B, K-inch condulet fitting with cover and gasket. ' One end of 11.1, 12.1, the condulet was attached to FNGS-supplied K-inch flexible 13.1 and 14.1 conduit (Anaconda Type EF) and the other end was attached to an LB fitting through a 6-inch nipple. The LB fitting contained another 6-inch nipple pointed dowr, ward (Figure C.11).
C-16
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~ Figure C.11: Typical of 3 condulets for specimens - 10.1A, 10.18, 11.1, 12.1,.13.1,-14.1. C-18
Calculation Report No. 92-00lS C.8.2 Chamber Preparation The test specimens, mounted on their respective test fixtures, were attached to carbon steel frames and installed inside a 60-inch diameter, 60-inch long (flange to flange) LOCA test chamber. The fixtures were tack welded to the chamber to ensure a solid connection to ground existed for the leakage current circuits. The Wyle-supplied Teflon wiring was carefully routed out multiple chamber penetration assemblies in the rear of the chamber. The 125 VDC wiring was segregated from the 632 VAC wiring and exited in a separate penetration assembly. The chamber penetrations were sealed with a Scotchcast No. 9 potting compound per Wyle laboratories standard practice. The chamber water level control system was adjusted to ensure that the specimens did not become submerged during the chemical spray period in the test. In addition, the chemical spray flow rate was adjusted to deliver 3.75 gallons per minute (0.15 gpm per square foot over a 25 foot square area). C.8.3 Specimen Operability (Figures 6.12 and 6.13) Snecimen No. Voltage Current Operations 7.1,8.1,9.1 632 VAC 20,2A Powered for the first 65 minutes. De-energized until the 46-hour point then re-energized for 2 minutes. 10.l A and 10.lB 137.5 VDC 200mA* None. Continuously energized. 11.1 and 12.1, 137.5 VDC 200mA* Powered for the first 60 minutes. 13.1 and 14.1 De-energized for remainder to test.
- Loading provided by an ASCO Model HV2023013U Solenoid Valve (23 Watt, 125 VDC) provided from the FNGS.
C-19
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.10.1A,.10.1B,-11.1, 12.1, 13.1, 14.1
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Calculation Report No. 92-001S - C.8.4 Accident Simulation The test specimens were subjected to two temperature / pressure profiles. The first profile (Main Steam Room Test) was performed as shown in Figure C.14. The temperature requirement of 323*F was met in 15 seconds and the pressure requirement of 6.4 PSIG was met in 2 seconds during this test. The second profile (containment) is as shown in Figures C.15, C.16 and C.17. The temperature peak of 393'F was met in 109 seconds and the peak pressure requirement of 53.3 PSIG was met in 217 seconds. Temperature was held above 393*F for 304 seconds prior to the temperature decay. Chemical spray was initiated at the 61-minute point and continued to the 25 hour 8 minute point in the test. The two test profiles were performed one after the other. C.8.5 DBE Test Results All of the test specimens demonstrated the ability to conduct the specified currents, at the specified voltages, throughout the LOCA tests. The recorded leakage currents to ground were: Specimen Leakage Current No. to Ground (mA) 10.l A and 10.lB 0.00 11.1 and 12.1 1.20 1 13.1 and 14.1 0.00 C.9 Conclusion All the test specimens maintained their circuit integrity throughout the DBE exposure. The test specimens (7.1 through 9.1) were immersed with %" of water (Photograph C.1). The test specimens (10.1 through 14.1) inside the conduits had no signs of , arcing or insulation breakdown (Photographs C.2 and C.3). Therefore, it can be concluded that the Okonite low voltage tape splices (with and without 0-35 jacketing tape) are enironmentally qualified and will perform its safety function (i.e., maintain circuit integrity) even when " locally submerged" due to a postulated LOCA environment for PWR Nuclear Power Plants. C-22
Calculation Report No. 92-00lS
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PHOTOGRAPH C.1 , POST-LOCA VIEW OF SPECDdENS 7.1-9.1. l THERE WAS ABOUT 1/P OF WATER INSIDE THE LIMTIURQUE COVER l AND ALL THREE SPLICES WERE WEP UNDERN"NH. NOTE THE l- CHEMICAL SPRAT DEPOSir AND CORROSION JUST BELOW THE . MYERS HUB. THERE WAS NO EVIDENCE OF INSULATION BREAKDOWN OR ARCINO ON ANY OF THE SPLICES. t. t i i C-27
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Calculation Report No. 92-00lS D.0 Enviromnental Qualification of Okonite 600V Power and Control Splices Outside PWR/BWR Containment While Under " Local Submergence" D.1 Purpose The purpose of this section is to establish environmental qualification of low voltage power and splice assemblies consisting of Okonite T-95 insulating tape and No. 35 splicing tape for outside containment applications under " local submergence" at PWR/BWR Nuclear Stations. The " local submergence" may result due to accumulation of condensate inside junction / pull boxes without edequate drainage for the condensate. D.2 References D 2.1 Wyle 12b Test Report No. 17961-01, Revision 00, dated 06-20-88; " Qualification Test Program for Okonite Taped "V" and In-line Splices for Commonwealth Edison Company for Use in LaSalle County Nuclear Power Station" D.2.2 Commonwealth Edison Procedure No. LEP-GM-137, Revision 03, dated 12-07-87;
" Methods of Taping Terminations" D.3 Similarity Analysis The tested splice assemblies (test specimens) were constructed to:
- 1. Reflect installed splice assemblies at LSCS which were made per CECO procedure LEP-GM-137, Revision 03 (Reference D.2.2). These are Specimen Sets 12,13 and 14.
- 2. Reflect installed splice assemblies at LSCS which were found during a field walkdwon. These are Specimen Sets 1-4,6-11, and 15-21,
- 3. Reflect interface with various miscellaneous cables which were manufactured by vendors other than Gionite Cable Co. This was done to prove material compatibility of the Okonite splice assembly to various cable materials. These are Specimen Sets 4,11 and 1-21. Note: Specimen Set 15 was built per Okonite i drawing No. D-11485.
! Therefore, the tested splice assemblies are identical in form, fit, function and l materials of construction to those splice assemblies installed in IECS after 2-22-83. I For existing and future installation of these splice assemblies traceability to the correct T-95 insulating type and 0-35 splicing tape is ediblished from the Wyle Lab test specimen inspection sheets: (Reference D.2.1, Page I-7) l \ D-1 f
u Calculation Report No.' 192-00lS; Okonite T-95 insulating tape (tested) = Okonite P/N 602 25-5010 -i Okonite O-35 splicing tape (tested) = Okonite P/N'602-35-7010L D.4 Equipment Description (Reference D.2.1, Pages I-7 and VH-4). = The equipment to be qualified consists of various Okonite tape splice configurations located in various outside containment areas at I.aSalle County Nuclear Power Station. The cable and connectors used in the construction of the _ splice assemblies are - qualified separately and are not part of the test specimens for the purposes of this- , analysis. The representative test specimens are 20 specimen sets, each consisting of three specimen subsets, as defined in Tables I and III, and Figures 2 through 6, Reference D.2.1, Section VII. Each splice assembly was constructed using the following splice tapes: Okonite T-95 insulating tape = Okonite P/N 602 25-5010 Okonite O 35 splicing (jacketing) tape = Okonite P/N 602-35-7010 D.5 Performance Requirements / Acceptance Criteria D.5.1 Baseline Function Test (Reference D.2.1, Page VII-13) Each splice assembly shall have its insulation resistance (IR) measured while in contact with a grounded metal surface by application of 500_VDC between its conductor and ground, for a minimum of one minute. The IR is then recorded for information only (i.e., no acceptance criteria is specified). If the IR measured for any test specimen is equal to or below 5.0 x 105 ohms-the megohmeter output voltage shall be reduced until the IR value is-measurable (usually 1.0 x 106 ohms). D.5.2 . Intermediate Function Tests (prior to DBE) The same requirements outlined in Section _D'.5.1 of this analysis also apply'for -
- these tests (Reference D.2.1, Pages VII-14 and -15).
D.5.3 Accident (DBE) Test / Post Ac. ident (Post-DBE) Test . D.5.3.1 Function Test (Reference D.2.1, Pages VII-18 and -19)' 1 Each test specimen (remaining in the test program) shall be IR-tested as described in Section D.5.1 of this analysis at the following times:'
' D _
e
, - ,r-rm- -- t---, e .- e r- - . , - m-
l I Calculation Report No. 92-00lS
- a. Pre-test ambient temperature
- b. - Pre-test pre-heat chamber temperature
- c. Peak DBE temperature
- d. Accelerated Post-DBE temperature (212*F) at t r= 13, 26, 39 and 54 hours
- e. Ambient tempeature upon completion of DBE/ Post DBE test
- Except for Specimen Sets 3, 8 and 13.
D.5.4 Acceptance Criteria (Reference D.2.1, Page VII-18 and 19) The test specimens shall demonstrate electrical integrity during DBE and Post-DBE testing. This is accomplished by connecting all test specimens to the appropriate fused circuits (Figure 7.7). Current loads shall be applied to the test specimen sets as shown in Reference D.2.1, Tabk III (Pages VII-43 through 48). During all times of the DBE/ Post-DBE test (except when measuring 1R) the leakage currents shall be measured and recorded for all specimen sets for information only. D.6 Qualification Test Sequence The test specimens were subjected to the following type test sequence per IEEE 323-1974:
- Receiving Inspection
- Test Sample Preparation (Wyle)
- Visual Inspection
- Baseline Functior.al Test
- Normal Conditions Radiation Exposure (40-Year Integrated Dose)
- Functional Test
- Thermal Aging
- Functional Test
- Accident Radiation Exposure (includes 10% ma gin)
- Functior.al Test
- AdditionalThermal Aging
- Functional Test
- Accident / Post-Accident Simulation
- Functional Test
- Post-Test Inspection D-3
Calculation Report Na. 92-00lS D.7 Evaluation of Qualification Test Result: D.7.1 Test Specimen Receipt Inspection, Prepe. tion and Baseline Function Testing
- a. A visual inspection of the specimen equipment, parts and components was conducted. The purpose was to document manufacturer and model numbers of the equipment, components and parts to be tested and any noticeable damage. The inspection items were tagged with Quality Assurance " Test Specimen" tags to facilitate identification during the preparation activities conducted prior to testing. Photographs were taken of the cable splice specimens and a " Test Specimen Inspection" report recorded any defects noted (Reference D.2.1, Pages I-7 through 9).
- b. Three specimen splices for each of 20 specimen sets were prepared in accordance with CECO LEP-GM-137 (Reference D 2.2) or splicing / taping methods were used during specimen preparation to reflect as-installed splice configurations. Metal identification tags were applied to each specimen such that l A, IB, IC, 2A,2B,2DC, etc., were used for the remairder of the test program for identification purposes.
- c. The specimen sets were either "V" or In-line splices fabricated from metallic and non-metallic parts. Okonite rubber cement and tapes were used in the fabrication of each splice. Each specimen set of three splices was assigned to a test group:
Splice Assembly Test Grouning Specimen Set Tyne Splice Groun Assig. I V Group 1 2 V Group 1 3 V Group 2 4 V Group 1 5 - 6 In-line Group 1 7 In-line Group 1 8 In-line Group 2 9 In-line Group 1 10 In-line Group 1 11 V Group 1 12 V Group 1 13 V Group 2 14 In-line Group 1 D-4
Calculation Report No. 92-001S 15 V - Group 1 16 In-line Group 1 17 V Group 1 18 In-line Group 1 19 V Group 1 20 In-line Group 1 21 V Group 1
~
- d. Of the Specimen Sets I through 21, Specimen Set 5 was not prepared because procurement of Rockbestos No.14 AWG cable (Product Code E41-Oll4),
with neoprene jacket, was not possible. Specimen Set 5 was then excluded from this and all remaining sections of the test program and all remaining specimen splices were prepared as listed below: Specimen 1st 2nd In line Bolt Set Lead' Lead
- Splice Connector Sjic 1 1 2 No 3 11 2 1 2 No 3 11 3 4 4 No 5 12 4 2 2 No 3 11 6 1 2 Yes 3 11 7 1 2 Yes 3 11 8 4 4 Yes 5 12 -
9 2 2 Yes 3 11 10 2 2 Yes 10 12 11 6 6 No 7- 11 12 2 .2 No 10 12 13 4 4 No 5 ;2 14 1 2 No 10 12 15 1 2 Yes 10 12 16 8 8 No 10 12 17 8 8 Yes . 10 12 18 9 9 No 3 11 19 9 9 Yes 10 12 20 1 1 No 10 12 21 1 1 Yes 10 12
. See Notes below for description of specimen set leads. - Notes:
- 1. Reliance thermofit Spec. 4824-6CM (Nomex) No.14 AWG.
- 2. Okonite EPR insulation, Okolon Jacket No.14 AWG.
- 3. PIDG ring terminal,1416 AWG, No.10 stud, blue stripe.
D-5
Calculation Report No. 92-00lS
- 4. Okonite EPR insulation, Okolon Jacket No. 2 AWG.
- 5. Burndy lug terminal, N60,2 STR CU., brown die.
- 6. Market flex lead (Belden silicone rubber) No.18 AWG.
- 7. PIDG ring terminal,16 22 AWG, No.10 stud, red stripe.
- 8. Rockbestos firewall Specimen, No.14 AWG.
- 9. Rockbestos B8483, No.16 AWG.
- 10. PIDG ring terminal,14-16 AWG,5/16" stud, blue stripe.
- 11. #S-32 x 1/2" round head machine screw, #8 internal tooth loc washer.
#8-32 hexagon nut (all 18-8 stainless steel).
- 12. 1/4" x 3/4" round head machine screw,1/4" flat washer (s),1/4" internal tooth lockwasher,1/4"-20 hexagon nut (all 18-8 stainless .,:1).
- e. Fabrication Methodology (Reference D.2.2, Pages VII-24 through VII-28,)
(Figures D.1 through D.5): Specimens l A,1B, IC - T-95 tape - two half lapped layers - no overlap of wire insulation 0-35 tape - two half lapped layers
-tape extends %" past end of lug barrel.
Specimens 2A,2B,2C - T-95 tape - two half lapped layers - overlaps terminal lugs %" O-35 tape - two half lapped layers - tape extends %" past end of lug barrel. Specimens 3A, 3B, 3C - Single half lapped over cable insulation extending 1/3" -T-95 tape - two half lapped layers over connection area on lugs 35 tape extends 3/4" past end of lug barrel. Specimens 4A, 4B, 4C - T-95 tape - two half lapped layers extends %" past end of terminal lug barrel. Specimens 6A, 6B, 6C - In-line splices - same overlap as I A, IB, IC. Specimens 7A, 7B, 7C - In-line splices - same overlap as 2A, 2B, 2C. Specimens 8A, 8B, 8C - In-line splices - same overlap as 3A, 3B, 3C. Specimens 9A, 9D, 9C - In-line splices without T-95 tape overlap over wire insulation. Tape O-35 overlaps %" past end of lug barrel. Specimens 10A,10B,10C - Same as 4A, 4B, 4C. Specimens ll A, llB,11C - Same as 4A,4B,4C. D-6
Calculation P.eport No. 92-001S
- f. An insulation resistance measurement was performed to satisfy the baseline functional test requirement. 500 VDC for 1 minute was applied between a conductor of the splice and ground. Resistance was recorded for each specimen. Lowest resistance was 9 x 10' ohms for specimen 10B; highest resistance was 5.8 x 10" ohms for Specimen 18A (Reference D.2.1, Pages I-23 and I-24).
D.8 Normal Radiation Exposure Test The test specimens were irradiated in two groups which were mounted in two metallic cable trays. The total dosage was 6.0 x 10' rads (gamma) from a Cobalt 60 source (cumulative TID) at a rate of 3.78 x 10' rads /hr. The test arrangement was: (Reference D.2.1, Pages II-1 and 5) Specimen Sets Cable Tray 3, 8, 14, 15, 16, 17, 18, 19, 20, 21 1 1, 2, 4, 6, 7, 9, 10, 11, 12, 13 2 Visual inspection was undertaken after completion of normal radiation exposure. Inspections looked for physical damage on other visible defects (Reference D.2.1, Page 11-2). There was no evidence of degradation of the specimens sets due to radiation exposure of the other specimens. The observations noted are not significant in effecting specimen electrical integrity. D.9 Thermal Aging Test The test specimens mounted in metal trays as noted in Section D.8 were placed in a thermal aging chamber at a temperature of 130*C (266*F +9' -0*) for the test periods stated herein: (unenergized state) Total Aging Soecimen Sets Times (hours) 3, 8, 13 336.5 1, 2, 4, 6, 7, 9, 10, 11, 12, 14 196.25 15, 16, 17, 18, 19, 20, 21 11 -170.25 D-7
Calculation Report No. 92-00lS
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i.. mi..ti i i. i n..
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- M it* t'llmi e es I:i t u t v . ) No. 14 AWO lAts)*tum. 10' 8 4 .i., g,.
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p ( Ag g eru s . I b' 14Ms.e i _- 1/2* - sektin a te T-4) Insula tion Talic' - Two lla t f =t.aqqu+si I qi.r:6 T.iam Shat ! Not 48verlags i nsul a tican. okemi to tha. JS .lackut Inel Tale 'fvo llalI-t-elegatti titcru. T.e e st tili. ! I 1:atenst 1/J' l'ae t L'nd uf Torminai 1.uis . Figure D.1: specimens 1A, 15, 1C, 2A+, 2B&, 2C+, 6A*, 6B*, 6C*, 7A++, 75++, 7C++, 14A**, 14B**, 14C**,
-15A***, ISB***, 15C***
Notes: 1. Okonito eeenent to be applied prior to taping.
- 2. *In-line splices with the same overlap as lh. IB.~ IC. Ctco to specif y cosinectors.'
J. "same conf!quration as 1A. 1D. 6 IC splicest 4 half-lapped layers of T-95 tape witt. 1* overlap. 2 half-lapped layere of No. )$ tape with 1-1/2" overlap.
- 4. *"Same configuration as 6A. 65 4 6C splicess e half-lapped layers of T-95 tape with I-3/a* overlasi. 2 half-lapped layers of No. 35 tape with 2=3/R' swertstr..
- 5. +same configuration as IA. 15. 1C splicest T-95 tape overlap of 1/4".
- 6. ++1n-11ne splices with the same overlap as 2A 23, 2C splices D-8
Calculation Report No. 92@ls i 6 i. IHau 4. Oma MLtog Tunque# To reina t a - 2 Typ. ( AMP PIDG or Estulv.) 1/ f,,,
~
8 l 2 - Idenstth Apprus. I S
- 1.imes I rks t e, 8)
N __ 1/2* okontto.T-95 Insulation Tape - Two tralf-Laissed Layers. Tape shall overlap W!re Insulation 1/4" . thonite No. 35 Jacketing Tape - Two limif-Lapped Layers. Tapo Shall tutend 1/2* Past End at Terminet M. Figure D.2t Specimens 4A, 4B, 4C, 5A, 55, SC, 10A, 105, 10C, 11A, 11B, 11C Notes: 1. Okonite cement to be applied pnor to taping,
- 2. 1% 10810C are in4ine splices witn the same nverlap as shown.
Ceco to spoofy connectors. 1 Two lengths of Okonite No.14 AWG for Specimens 4A,48. aC and 1% 108,10C. Two lengths of Fbekbestos No.14 AWG Cable (Rockbestos Product Code eE410114) wem neoprene jac tapmg over jacast for Specimens 5A,58. SC. Two lengtns of Market Aestesd CSA (SOR Pigtset) for Specimens 11 A,118.11C. D-9
Calculation Report No. 92-00lS
...w aa6wa nas9 sueeque Terminals - 2 Typ.
(AMP PlbG or Djuiv.)
# go T-95 Tapo 1-
* *, f '
T U~ Okonite No. 14 AWO
\ (Angsron. 15' lainyl
./
i - p e l al /T - okont to T-95 Insulation Tape - ivo llat f-l.apped t.ayors. Tape shall Overlap Wire ineutation l' stkonite No. 35 Jacketing Tatse - 1vo lla!f-tapped Layors. Tape Sha!! Estend t-1/T Past End of Terminal tel. Figure D.3: specimens 12A, 125, 12C, 9A*, 9B*, 9C* l Notes: 1) Okonite cement to be applied prior to testing. .
- 2) *In-!!ne sp!!ces without T-95 tape overlap over wire insulation and with tape No. 35 overlap of 1/2* Over the wire insulation past end of terminal lug,
- 3) Ceco to speelfy connectors l
i 1 l l i D-10
Calculatiori Report No. 92-00lS 1 inulated Ring Tonnuo T. rn t na l s
- 2 Tygs .
I nstt' ri tW: n r Citu t v . )
. . . . .. , . . t r e M,, ; ,.......t,,~.,,,....
N m 1 l .
-- hn - :
Okont te T-95 Insulation Tape
- Two ital f-L,atqurd Layers.
Tape Shall teot Overlap insulation. Okonite No, 15 Jacketing Tapo - Two Italf-L.ained I.ayors. Tapo shall Estend 1/J' Past End of Terminal 4.un. 168, 16C, 17A*, 17B*, 17C*, Tigure D.48 Specimens 16A, 18A, 18B, 18C, 19A*, 19B*, 19C*, 20A, 208, 20C, 21A*, 21B*, 22C* Okonite cement to be applied orior to taoing. 168. 16C and Notos: 1) Two lengths of SIS switchboard wire #14AWG for specimens llA.
- 2) 9 199 19C.
17A, 178. !?C Two tengths of Rocktestos $8ta3 # 16 AWG20c, for specimens and 21A. 21u,18A,188,18C. 2lc and 1 A, Two lengths of Nomex #14AWG for specimens 20A. Joy, lavern e=* r l aa maet at.o.ha r n f t ar = '
- 3)
- 1 n- l i ne s p l i ce s wi t h * ** = ==
el ccco to specify connectors D-I l
Calculation Report No. 92-001S usu uurmly or natuivalent m n, rongo. tor.tnat.-z typ. . Ottonito No. 2 AWt!
- J Typ.
(Asmron. 12' Lr,niel L/2*
,u %
l v = 1 Je* omonite T-95 Insulation Tage - single ualf-1. spiel .avur. Tape shall therlap wtre insulation 1/2*. otemito W . 35 Jacketing tape - two llatt-Lapted Layers. Tage shall 4:stend 3/4* Past End of Torin&nat 1.ug. . Figure D.5 Speciamens 3A+, 3B+, 3C+, 8A*, BB*, 8C*# 13Aa*, 13B**, 13C** Notes: 1) Okontte cement to en appled prior to .aoing
- 2) *inaine solices we the same overtso Ceco so spacify connetors.
Soft to be softened wvth T 95 insulation tape prior to Instalianon of T.06 tape overtapping cable insulaton. 3)
"The same configuration as 3A. 38 & 3C sporae 4 half 4apped layers of T 06 tape with 1' overtap. 2 half 4spped layers of No.35 tape wm 11/2 overlap.
41 + singie half-lapred m'y over canse insutanen. Two heafaapped % over connecoon u.a. D-12
Calculation Report No. 92,') DIS 3 sweeping 90 0 Elbows i f H:ffman NEMA 12 Enc!csure ] 46 dd dd / 4 l l
*E' r pecimen
=
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j / ... .- , o 8 Hoffman NEMA 12 Enosoeure weth 3 sweep 6ng 90 Showe arMI 1/4' woop hoes in boteam
't? Speamen touoNng tenom v speamen toveNng asse was v speoemen suspended in na rigure P.6 Typical Location of Test specimens inside the soffman Enclosge;3
2OA 800:5 VOLT
,_ p A A TRANSFORMER 120 VAC
, }
t IA DAS c 5:20 A DAr.
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Olc 5:25 A O.i n _CT T CilAMBER WALL J ~ A I.0 n x ; 1^ e-9 e-- 0 BH - I DAs - 100:5 CT , i I ~~
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- f n n m o __. e .. .l'.
120 VAC g,] f, T.B. T. B.
~
l , 20 Al4P OR IOAlIP IOOAMP ( URREN f k 2 VARIAC TRANSTORMER [ 8
- THREE LOOPS THROUGH Cl RESULTING IN A 33:5 RATIO Y A A C./ D (. LONVLliiI n A CIRCUITS l-20 ; I 20 AMP VARIAC PER 5 ISOLATION TRANSFORHERS g CIRCUIT 2i; I 15 AMP VARIAC -
A ISOLATION TRANSFORMERS - CIRCUITS I-20; 120:600 VOLT -
;S CIRCulT 21; 120:480 VOLT 8; c;
Figure D.73 Electrical Power Circuit
Calculation Repost No. 92-001S 4 As each specimen sets completed their total thermal aging periods, they were removed from the test chamber and visual inspections and functional tests were conducted (Reference D.2.1, Section II, Paragraph 2.2). Post Thennal Aging Functional Test , insulation resistance was measured at 500 VDC for 1 minute between a splice conductor and g round resistance was recorded for each specimen lowest resistance reading was 1.8 x 10 ohms for specimen 14B. (Reference D.2.1, Pages V-15 through V17) D.10 Accident Radiation Exposure Test The test specimens were irradiated in the same manner described in Section 7.8 of this analysis. The specimens received a TID for t his test phase of 4.01 x 10' rads of 5 Cobalt 60 (gamma) radiation at a dose rate of 2.42 x 10 rads / hour. (Reference D.2.1, Pages IV 1 and 5). The TID for the specimens is 6.00 x 10' rads + 4.01 x 10' rads = 1.01 x 10' rads. This satisfies the outside containment requirement for a TID of 1.0 x 10' rads for all zones. Post Accident Radiation function Tests revealed a minimum IR value measured of 2.5 x 10" ohms (Specimen IC) which is well within acceptable values. (Reference D.2.1, Pages IV - 14) D.11 Additional Thennal Aging Test Due to insufficient thermal aging, the test specimens were additionally thermally aged ' at a temperature of 130*C for the following durations: (Reference D.2.1, Page V-1) Additional Total Aging Snecimen Set: Agine Time (hours) Time (houts) 3, L and 13 1,095.6 1,432 1,2,4,6,7,9, 70.25 266.5 10, 12, 14, 15, 16, 17,19,20 and 21 11 Not Required 170.25 Post Thermal Aging Function Test The lowest IR measured for any specimen was 1.8 x 10 ohms (Specimen 14B) which is well within an acceptable range of IR values. (Reference D.2.1, Pages V-15
- through 17) 4 D 15 l-
Calculadon Report No. 92-00lS D.12 Accident / Post Accident Test D 12.1 Test Configuration (Reference D.2.1, Pages VI l through 4) Group 1 Specimen Sets, with each specimen set ensisting of specimen splices A through C, were connected to Wyle test leads (No.14 AWG Teflon wire) using butt splices. The specimen / lead splices were scaled using Raychem WCSF N heat shrink tubing the splices of each specimen set were mounted in a Nema 12 enclosure, of dimensions 36"H x 48"L x 12"W, such that splice A was in contact with the bottom of the enclosure, splice B was in contact with the side of the enclosure, and splice C was suspended free in air (Figure D.6). A weep hole for the Nema 12 enclosure was scaled in order to allow any condensation on the inside of the enclosure to accumulate in the bottom. The Wyle test leads for the specimen sets were routed out of the Nema 12 enclosure through two 2-inch Myers hubs connected to 2-inch sweeping 90' conduits. The Wyle test leads for each specimen circuit (specimen splices A, B, and C) were intentionally routed such that all leads of a given circuit entered and exited the Nema 12 enclosure through the same 2 inch penetration (Photographs D.1, D.2, D 3, D.4, D.5, D.6, D.7 D.8). D.12.2 Electrical Powering The Wyle test leads were routed through a Wyle chamber penetration and the penetration sealed as per Wyle Laboratories' standard practice. The Wyle test leads were connected to terminal blocks outside of the test chamber and electrical loads were applied as shown in Figure D.7 (Reference D.2.1, Section VI) With the electrical loads connected to the test specimen set circuits, the voltages were adjusted to 305 VAC with a tolerance of +10%, -0% and the currents were adjusted to 2.0 amps (Specimen Set 11) and 6.7 amps (all remaining specimen sets) with tolerances of +10%, -0% during the transient and +5%, -0% for the remainder of the accident simulation. l i D 16
Calculation Report No. 92 001S Group 11 specimens, with each specime:n set consisting of Specimen Splices A through C, were connected to Wyle test leads (do. 2 AWG Teflon wire) using butt splices. The specimen / lead splices were scaled using Raychem WCSF-N heat shrink tubing. The splices of each specimen set were mounted in a Nema 12 enclosure of dimensions of 36"11 x 48"L x 12*W, such that splice A was in contact with the bottom of the enclosure, splice D was in contact with the side of the enclosure, and splice C was suspended in free air (Figure D.6). A weep hole for the Nema 12 enclosure was scaled in order to allow any condensation on the inside of the enclosure to accumulate in the bottom. The Wyle test leads for the specimen sets were routed out of the enclosure through three 2-inch Myers hubs connected to 2 inch sweeping 90* conduits. the Wyle test leads for each specimen circuit (Specimen Splices A, D, and C) were intentionally routed such that all leads of a given circuit entered and exited the Nema 12 enclosure through the same 2-inch penetration (Photographs D.9, D.10, D.11, D.12). D.12.3 Evaluation of Accident Portion of Test Examination of the first six hours of testing for both test groups reveals that all test specimens were exposed to test temperatures in excess of the required 212*F +15'F margin (Figure D.8). (See Pages VI-71 and VI-101, Reference D.2.1). One test anomaly occurred during the accident part of the DBE/ Post DBE test for the Group 1 test specimens. D.12.4 Electrical Integrity Electrical power to the specimen sets was applied in the manner depicted in the test report (Reference D.2.1, Appendix 11 of Section VI, Figure 1), voltage, load current and leakage current were moritored continuously and recorded (Reference D.2.1, Table til of Section VII): Test Voltage (VAC) Test Current (A) Specimen Sets (No) 305 (+ 10%, -0%) 6.7 1 through 10 12,14 through 21 2.0 11 64.0 3, 8, 13 The test specimens were subjected to an insulation resistance test at the start of the test progn.m ana immediately after Radiation, Thermal Aging and Accident Exposure test portions of the program. D-17
t Calculation Report No. 92 @ lS Peak Leakage Current Data All environmental channels were monitored during the tecident simulation test phase of the program. Group l' Heat Rise Peak Leakage Specimen No. ('C) Current (m A) ' 1 3.5 6 2 3.5 21 4 3.5 19 6 3.5 11 7 3.5 23 9 3.5 13 10 3.5 9 11 0.0 17 12 3.5 8 14 3.5 59 15 3.5 9 16 3.5 1 17 3.5 1 18 3.5 10 19 3.5 7 20 3.5 27 21 3.5 8
- Figures D.9 through D.25 Group II'* Heat Rise Peak Leakage Specimen No. ('C) CurrCat (mA) 3 17.3 1 8 17.3 6-13 17.3 3
** Figures D.26 through D.28 D-18
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Calculation Report Noi . 92-001S-D.13 Post Test Disassembly Group I Test specimen assemblies (i.e., splice plus connected cables) that had been removed from - test circuits because of failure during the accident test, were located and notice was made as to potential areas of failure on the individual splice components. The enclosure was allowed to dry and the specimen sets were removed so that photographs of each specimen - set could be taken (Ph"ographs D.13, D.14 and D.15). Group I consisted of Specimen Sets 1, 2, 4, 6, 9, -1. 14-21. -Note the accumulation of water at the bottom of the junction box. Upon completion of the inspection, the failed specimen assemblies were subjected to hi-pot tests to verify that the suspect areas of the splice assemblies were actually' the weakest points of the individual splice assemblies. Group II Upon completion of the post-test functional test, the test specimens (Sets 3, 8 and 13) visually inspected (Photographs D 16, D.17 and D.18). The NEMA 12 enclosure door was opened, with the enclosure mounted in the chamber, in order to determine the depth-of the accumulated moisture in the bottom of the enclosum. The enclosure wr.s then removed from the chamber and photographs were taken. The weep hole of the enclosure was unplugged and the accumulated water was allowed to drain' out. The enclosure was allowed to dry and the specimen sets were removed so that photographs of each specimen set could be taken. . ll D-48 ' 1 y --
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Calculation Report No. 92-00lS D.14 Qualification Test Anomalies Wyle N.O.A. No. 2 (Reference D.2.1, Pages VI-13 and 14) During the specified post DBE conditions of the Group I specimens accident simulation, Specimen Splices I A, 21 A and 21C exhibited leakage in excess of I amp and were necessarily removed from their respective circuits (Specimen 21C at 9.5 hr., Specimen 21 A at 31.5 hr., and Specimen I A at 36.5 hr.). During the post-test visual inspection, it was determined that each failed specimen splice was constructed using at least one Reliance thermofit (Nomex) lead wire and that a burned / darkened area existed on the braided material of this lead wire on each specimen splice. Additional hy-pot testing verified that the burned / darkened arca(s) on the braided material of the lead wire (s) were the weakest points of the specimen splices (Photographs D.19, D.20, and D.21), it was felt the Specimen Splice 21C had come into physical contact with the enclosure internal thermocouple No. 4, during the accident simulation, and that this contact was the cause of the excessive leakage exhibited through the lead wire to ground. This was caused by application of the initial DBE pressure transient which caused this free-to-swing specimen to move and come into contact with the enclosure. Specimen Splices I A and 21 A were determined to have been at least partially immersed in water (Photographs D.13, D.14 and D.15), upon initiation of saturated conditions, during the accident simulation thus allowing a leakage path to ground through the lead wires of the failed splices, it should be noted that Specimen Set Numbers 2,6, 7,14,15 and 20 were constructed using the same Reliance thermofit (Nomex) lead wire and maintained electrical integrity throughout the accident simulation. D-53
Calculation Report No. 001S ; Specimens 1A and 21A,- using Nomex lead wire supplied by-Reliance Electric. Company in accordance with their Specification #4824-6-CM, exhibited excess leakage currents during the accident simulation. - A post-test examination of these specimens isolated the cause of the excess leakage current to the Nomex leads (Photographs D.19,-D 20, and D.21), both of :
- which were immersed during the accident simulation. Specimen 21C excess :-
leakage currents was judged to have been inadvertently caused by contact > of the Nomex lead with the metal-sheathed thermocouple in the junction:: box. This happened during the initial;; essure transient which caused the free-to-swing Specimen 21C to move such that its Nomex cable came into - permanent contact with the thermocouple. Hence excess ~ leakage current-was the result and a leakage path to ground occurred via the thermocouple. D.15 - Conclusion Based upon the above evaluation, Okonite low voltage power and control splices are environmentally qualified for BWR/PWR on outside containment while under-
" local submergence."
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