ML20059M747
| ML20059M747 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 08/17/1993 |
| From: | AFFILIATION NOT ASSIGNED |
| To: | |
| References | |
| OLA-2-I-MFP-016, OLA-2-I-MFP-16, NUDOCS 9311190279 | |
| Download: ML20059M747 (13) | |
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Date: Thursday, March 18, 1993 18:00:09 PST h b .-
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Wells, We had a very short but productive meeting with Joe today, here at TES. So far, our chemical results are in the same ball park as his, looking at preliminary tests.
I also found out today from Richard Potter (DCPP Environmaental Coordinator) that on 6/21/92, there was an accidental mixing of con. sulfuric acid and con. sodium hydroxide that resulted in an exothermic reaction causing some spilleage. The exact details are in an A/R for operations. Maybe Chuck Short can help Vern track this down on Friday ?
After looking at the samples of cable I am in agreenent with Joe that the jacket was chemically attacked. We are still working on the source. I will FA) the latest test info. down to Vern tomorrow for your meeting. We are also dp4ng some other lab tests, and we will keep you appraised.
1( will be home most of this weekend. Remember what happened last Friday!!
Phones (510) 828-7881, home (510) 866-5303, work and voice mail 8-251-5303, Co.
-Rich McCurdy 1
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14730 NORTHAM STREET I.AMIRADA, CApIFORNIA 90638 ! (1/4) 523-(/370 Bonzar W. Buzxrz wen russmat.wamp naosont usms February 12, 1990 Pacific Cas & Elect-da. Company 3400 Crow Canyon Road San Ramon, California 94583 Attention: Mr. Ron C. Bush, Senior Electrical Engineer Subjert: Evaluation of SkV shielded Okonite cable returned from P.G.&E. Diablo Canp n Unit II. , Mr. Bush, Attached is Engineering Report f463 as prepared my Messers G. T. Dobrovski and Dr. J. S. 1.asky. This report details the data obtained from the tests conducted at our Paterson, New Jersey Cable Evaluation Laboratory. If you have any questions please do not hesitate to contact me as I will be in the San Francisco district office all week beginning Tuesday morning 2/13/90. Sincerely 1 1 Y '
/ B0 SUEh E 1
. t i RWB/bjs ec: Mr. v. Wyman attachment (1) 1
gTAE v OKONITE
' Rarrm3y. New J2reay COMPANY 07446 l
February 5, 1990 ENGINEERING REPORT NO. 4 63 l l EVALUATION OF SkV SHIELDED OKOGUARD-OKOPRENE POWER CABLE RETURNED FROM PGEE DIABLO CANYON - UNIT II ~ ZDkToductton In conjunction with a cable failure analysis performed by PG&E on ) a 1/C 2/0 SkV shielded Okoguard-Okoprene power cable that fed 1 Diablo Canyon - Unit II, ASW Pump 2-2, cable-from that circuit was returned to the Paterson Cable Evaluation Laboratory for testing. soeelmen construction l Four lengths of cable received from PGGE identified as cables A, B, C and D, ranged in length from 27 ft. 2 in. to 36 ft. 8 in, were reported to be from PG&E Diablo Canyon Unit II ASW Pump 2-2 circuit. i All cables are 1/C 2/0 - 19x CC SkV rated Okoguard shielded Okoprene, with 0.030" semiconducting strand screen, 0.110" Okoguard (black) MV insulation, 0.030" semiconducting insulation screen, 2-1/2" x 0.010" semiconducting tape,;1" x 0.095" coated copper shield tape, FN-1 cable tape, #159 l cable . tape, 0.060" l Okoprene (gray paint). J Print Legend - The Okonite Co. Pit. 5- 1972 EPR Shielded Neoprene 2/0 AWG Cu 5000V Marker Tape: Cable A - Not Legible m .ev. Cable B - 3773469 - 3773495 Cable C - 37734b9 - 3773529 Cable D - Not Legible These marker tapes correspond to real (0101-1B made at Okonite N Plant 5 in 1972 - Copies of the certified test reports are on file at Okonite and were examined by Mr. Vern Wyman in Paterson. Conclusions All cables returned for evaluations meet all of the test-require-ments for new cable from the PG&E specification 0702 with the ex- . I ception of the physical characteristics of the neoprene jacket' i The dielectric strength breakdown values are typical of values for cables of this type and vintage. l l
t . v. Engineering Report No. 463 February 5, 1990 The sample testing completed gives no indication that there is any abnormal deterioration of the insulation. The neoprene jacket has aged as expected over the 18 year period since it was made.- The properties are considered normal for 18 : year.old-cable. All other properties meet the 0702 specifica . l tion, and there are no significant differences between the cables i tested and the properties reported in test-reports in 1972 other-than the neoprene jacket physiccis. l Procedura-and miseussion ] The cable specimens were ' visually examined for evidence' of 1 mechanical damage or_other abnormalities, the cables appeared to- l be in good condition. The surface print legend and painted color i code were identifiable. l PG&E tagged each cable with identification by letter cable A, B, _
.)
C and D. Each tag included observations made ' by PG&E personnel ] and megger readings. The inforpation on the tags is as follows: -, 1 A. Water dripped from stripped back and of cable when' received. from Diablo at TES on January 10, 1990. 2500V megger measured 50,000 magohns on January-10, 1990 at ! TES. B. No water in cable when received on January 10, 1990.- 2500V megger measured 1200 magohns on January 10,'1990 at l TES. C. Water dripped from stripped back and of cable when received from Diablo at TES on January 10, 1990. With 2500V de megger measured 600 megohns on January 10, 1990 at TES. D. No water in cable when receive on January 10, 1990. With 2500V de magger measured 50,000 magohns on' January 10, 1990 at TES. , A visual examination of the conductors noted bright ' shiney , material, the conductors were dry;-it'does not appear that there-was any significant amount of moisture in the conductor nor was it there~for any appreciable length of time. 'It is surmised that the moisture was introduced to the cable after the cable was cut into the test lengths. The absence of moisture in Cable B and . the notation of moisture in cable C, an adjacent sample from a . ! common length tends to substantiate this point. i l ____.______i
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l Engineering Report No. 463 February.5, 1990 A one foot section of each cable was submitted for physical test-ing of the insulation and jacket. The results are as'follows:- ! l
. PG&E.
. Typical ? Spec.:0702 :
New W/ Exception- j Cable A- B B A 1972-. ~12/9/71 ! Jacket (Gray) i Tensile, psi 1538; 1311 1359. 1465 --2020 '1800-2004 Mod. , psi 1138 1075 1092 1095 1110 500 I Elongation, t 283 ' 250 257 283 350 300 Insulation Tensile, psi 853 830 822- 861 810 700 200% Mod., psi 604 573 611 638 530 --- i 323 353- 343- 333
^
Elongation,.%' 365' '300-Each length was subjected to factory electrical tests,per Pacific-Gas & Electric Company Specification No. 0702, 7/15/71.. All' i lengths pass the 16.5kV ac five minute withstand' test, 40.0kV dc - i fifteen minute- withstand test,:and meet ..the 25,000 magohm- -l 1000 ft. insulation resistance constant. In addition to the fac-tory proof tests, electrical ~ characteristics vs. . stress c and ) corona measurements were . perfornied, fo11owing1these measurements , the cables were taken to their ~ ultimate dielectric strength (ac. and de voltage breakdowns). The dielectric strength tests'util L - ized a step time procedure, the,ac tests-. initiated at 20kV ac for : 2 minutes and increased:in steps of SkV:ac every 2 minutes, the de tests initiated at 50kV de and increased 10kV 'dc in l~ minute steps on Cable A and 20kV dc'in l' minute steps on~ Cable B. The electrical characteristics and dielectric. strength breakdown '
' values from Tables 1, 2.and 3 are considered typical for the sub-ject construction.
The corona data, Table 4 charts, show all cables.to.be corona- i free to at least 10kV act the cables had been operating'at 2.4kV ac. The apparent corona on Cables B and C'are attributed:to'ter-minal discharger Cable B sustained damage to the terminal when ) preparing the cable ends. One end had to.be cut to six inches, n. ! terminal that short is at the limit of:being corona-free to the '( necessary stress levels without and discharge. It appears'that l we exceeded the' limit and did not have the opportunity to reter- > minate. Cable C exhibited a similar problem, however,'in this i case we were able to reterminate the cable.and significant1y' I reduce the end discharge. See repeat test Cable C.- I
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o Y, Engineering Report No. 463 February 5, 1990 Ishlt.1 poeterv steetetent feats TyPleal how PGAE a e e e 1972 seee. e702 Test pass ~ ' Fess Pass pass. Pass Pass , 16.5tv sc withstand (5 afrustes) Pass pass Pass Pass Pass Pass 40.0tv de Ulthstand (15 minutes) 5 5 5 1.ta10 5 9.sts10 1.s6 10 1.14:10 5.4sa10' 2.5a10' Insutstion sosistence
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Our Insulation Resistance values are higher than those measured at PG&E. We can only assumenexperimental' difficulties at PG&E. almost certainly caused by and leakage due to short creepage dis-tances. The presence of shoz:t ends at PG&E during the magger: tests'was confirmed by'Mr. Wyman of PG&E. Table 2
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ae . SIC.'t PF vs. Stress A B C D V/ mil-i Strests SIC 4 PF SIC M SIC M _ SIC .. 4 PF 20 3.30 0.35 3.56 0.35 3.54 'O.35 3.32 0.34 40 3.30 0.39 3.56 0.37 3.54 0.37 3.32 0.35 ! 60 3.30 0.43 3.56 0.40 3.54 0.49 3.32 0.37 80 3.30 0.47 3.56 0.41 3.54 0.41 3.32 0.38 ; 100 3.30 0.53 3.56 0.43 3.54 0.42 3.32 0.39 120 3.30 0.57 3.56 0.44 3.54 0.44 3.32 0.40 Table 3 Dielectric Stranath - Stan Time Bramkdown Test. A B - c' D ] Breakdown Voltage 200kV f(c 175kV dc 40kV ac' 50kV.ac* , Time' 12 sec. on' rise- 30 sec. no failure to 180kV
- Sample D passed 2 minutes at 50kV ac. TheLlimit of the test set and the painted test terminals did not allow increasing the test voltage to 55kV ac. It was decided to' extend the I test time to 5 minutes which would be 3 times the factory ac j test requirement. The cable passed this level and testing was-discontinued. ,
F' Engineering Report No. 463 . February 5, 1990
\
1 Table 4 l Attached Corona Test Charts 1 1 mummination'of Wafers at the Fault Location' The length of cable with the' failure present was not sent to'the; ' okonite Laboratories'for examination. l Okonite was given a description of the' cable section with the fault and was shown four wafers which included the fault area. The cable at the fault was described by Mr. Wyman'of..PG&E asp- ! being flattened and being. oval in shape.- This ovality could have/- been caused during installation due- to excessive sidewall pres a sures, and if so this could lead to some damage to the-insulation 0 which shortened the life of the cable.section in questiong The wafers were examined at our - facility _ and !nothing ' unusual ! noted except the small raised section oncone-wafer descibed by l Mr. Wyman as a " monument". Th's." monument" was about the th_ick-ness of the wafer, integrally adhered to.the. wafer surface below it, approximately' circular'in cross-section, and about 50 to 100 mils in diameter with a smooth flat top, i.e., as if a~small hill-was sliced off leaving a flat plateau. Although what follows is to some degree speculative,~it is our feeling that the " monument" is an artifact of the wafaring operation. If the fault started at the conductor and proceeded'asLa single path into the insulation, and then branched-into two fault paths in the body of the insulation and.then rejoined at the shield as a single path, one would ' have a 'small piUer of -insulation g remaining in the fault area whose long dimension: was parallel tb the axis of the cable. As the cable is wafered perpendicular to-the cable axis, the pillar would'be cut leaving the plateau ob- , served. All that need happen during the.~wafering operation is i for this thin pillar to . bend out' of the way of the blade' and remain attached to the cut-surface. The next wafer.is then cut and the cut made below the base of the pillar. Thus this wafer then has the so called amonument" on it. The " monument" was ' definitely insulation material with ' the side-walls to our eye appearing burned andLcarbonized which lands sup-port to the above mechanism. It was not in our view a con-taminant or inclusion. We feel the above is a likely and reasonable scenario to explain. , the experimental observations on the'" monument". b
- 5. February 5,'1990 Engineering Report No. 463 an==ary and Recommendations In summary, all of the data collected show that the cable sac a The neoprene jucket 0 tions examined are in excellent condition.)
has aged as one would expect after 18 years? Electrically and1 i
' physically the insulation is in "as new" condition. ,We conclude 1 that the failure was an isolated incident possibly _ caused by-in- 3 l l
sta11ation damage.. l Since the cable of.1972 in the *as new" state was not up to stan- f dards of performance in terms of testing, noisture stability and dielectric strength of current cables, nor were the methods of l production in 1972 as reliable as today's production methods; we feel it would be prudent to replace the medium voltage cables l known to be in areas subject.to water submergence under. normal ; conditions with cables of today's production methods, materials, i and design. This could be done on a regular maintenance ' schedule. It is by no means implied that an emergency situation exists. pg. g;f. p 3p
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