ML20094N228
| ML20094N228 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 02/12/1992 |
| From: | OKONITE CO. |
| To: | |
| References | |
| CIVP-A-021, CIVP-A-21, NUDOCS 9204060231 | |
| Download: ML20094N228 (40) | |
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., 2/H-l9Z-NUCLEAR SAFETY RELATED g D'Fg1LD NUCLEAR ENVIROMtENTAL QUALIFICATION REPORT '92 tiAR 13 P12:01
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OEDNITE REPORT NO. NQRN-3 This report is The Okonite Company's nuclear qualification document for Okoguard insulated cables and splicing tapes..- It complies with each para-graph in IEEE Standard 383-1974, Section 1.4 " Documentation". Se. tion 1.4 s documents the parameters specified in Section 1.3, " Type Tests e Qual-ification Method." i
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Included in this report are appendices which serve to further clarify Okonite's test procedures aid results. These appendices are as follows: Appendix 1 Straight Sp] ice -- 1/C Rubber Insulated, Shielded, Jacketed , Nucles.r Station Cable D-11489
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/ 2 *0 '.' ear Life Detail Document 3- = Radiation Certification 4 Okonite's LOCA Test Profile R4 5 LOCA Autoclave Drawing 6 List of Equipment
'7 Elevated Tenperature Moisture Absorption 8 Vertical Tray Flame Test -
9 Insulation Resistance R4 10 Anomalies Rev. 1 - 6/30/82 Rev. 2 - 2/16/84 Rev. 3 - 3/31/87 Rev. 4 - 10/24/88 L.} 9204060231 920212 } PDR ADOCK 0S000348 0 PDR L . _
NUCitAR REGULATORY COMvlSS10N Detkut No, _ Of mi Dh. No. I in the rnttiat of _ MMfd*, MM_NL . .. ~ tan Y _ - IDENTJ1ED .D- ~. Anikan: .. Inter, cad _, L'ECEIVED
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re, A' , The necessary data to document satisfactory compliance es specified in !* Section 2.6 of !EEE 383, " Documentation of Type "festing" is provided in this report. The following cross-reference table illustrates where this information can be found. Section Title "ection in Repn,rt 2.3.1 Temperature and Moisture Appendix 7 2.3.2 Long-term Physical Aging Properties Appendix 2
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2.3.3 Thermal and Radiation Exposure Paragraph T.4.1.3 (Pre-aging and Irradiation , and Appenoix 3). 2.4 ' Testing for Operation During Paragraph 1.4 and specif-DBE-LOCA ically 1.4.2, 1.4.3, and 1.4.4 2.5;1 Vertical Tray Flame Test' Appendix 8 y a A I I 1' t t
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Documentation of Test Procedures -- IEEE 383, Serion 1.4 1.4 Documentation 1.4.1.1
Description:
SkV, 86, 7X BC, extruded semicon, .090" Okoguard, extru sd semicon, .005" x 1" BC shiciding tape,121% lap, no jacket. Two 15 ft. samples: 1-non-aged, 1-thermally aged. 1.4.1.2 Descriptica of hand-wrapped filled splice: Pr attached drawing D-11469, Appendix 1, with the following exceptaoas: (1) The cable tested had no jacket. However, Jacketing tape im (No. 35) was applied over the splice. (2) Ctounding straps and tinned copper perforated strips were not utilized. (3) A compressio.1 connector was used instead of a solder connec-tor. 1.4.1.3 Identificatien of environmental features: _ Listed below are the environmental pr.rameters which the samples 3
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eere subjected to. A temperature-pressure profile is given in Appendix 4. Preaging: Aged sample was aged for 3 weeks 9 150*C in a forced draft circulating air oven. Temperature was monitored
' continuously by a chart recorder. Appendix 2 is a "
detailed discussion of 40 year life simulations. hilation: The samples received a minimum dose of 200M rads of gamma radiation at a rate >>f less than 1 megarad per hour. See attached certification (Appendix 3). Temperature: 2 peaks at 345'F for 3 hrt. each 3 hrs. at 335'F 4 hrs, at 315*F 3 days 9 hrs. at 265'F 126 days at 212*F Pressure: 2 peaks at 114 psi for 3 hrs. qch 3 hrs. at 95 psi 4 hrs. at 69 psi 3 days 9 hrs. at 24 psi 126 days at 0 psi Relative Humidity: Saturated steam conditions throughout profile. Chemistry of Spray Soluticn: per IEEE 323, Appendix A Table A-1
.28 molar H30 3
.064 molar Na223 60 NaOH approx. .59% to make a pH of 10.5 at 77*F dissolved in tap water 3 Spray rate of minimum .15 (gal / min)/ft.' of curface area of the test vessel.
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'1.4.1.4 Specific performance requirements (Acceptance Criteria) l 1
(a) Cable and splice must maintain electrical load throughout 1 entire LOCA profile. , (b) Cable a:.d splice must withstand the 30 day and 130 d1y Post - l LOCA withstand tests (40 x OD at 80 V/ mil, 5 min.) l (c) Terst sequence must provide a margin of assurance. + i 1.4.1.5 , Test Program (a) Sample selection i L ,
*(b) Pre-test electrical and physical (mechani:al) characteristics '
L -- to determine if samples are representative samples-capacitance, % PF, and IR. l (c) Prepare splices
*(d) Electrical characteristics-after splices -- to determine if splices were made correctly.
3-(e) Thermal aging of one-sample: 3 weeks at 150*C followed by >
, electrical characteristics?
(f) Irradiation of samples: 200M rads
*(g) Pre-LOCA electrical characteristics -- to determine the con-dition of samples prior to LOCA i
(h). Installation of samples into LOCA vessel *
*(i) Pre LOCA insulation resistance measurements and 5 min.
80 V/ mil ac withstand test, to determine if samples were damaged during installation. , , (j) Chemical solution sprayed into vessel. (k) Initiation of LOCA simulation (see Profile-Appendix 4). . M (1) Maintenance-of LOCA profile thru 30 days with 1R measure-ments* taken as shown in profile.
*(m) 30 day Post-LOCA withstand test (40 x OD bend, 80 V/ mil ac, 5 minutes)
(n) Reinsta11ation of samples into vessel for additional 100
' days at ?l2*F. la measurements
- taken once every two weeks.
(o) 130 day Post-LOCA withstand test ' 40 x OD bend, 80 V'all ac, 5 minutes)
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*(p) Electrical and physical characteristics after LOCA.
*(q) Dielectric strength.
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- Electrical or physical tests are not requirements of IEEE 323 or 383.
NOTE: Test program and results of the vertical tray flame test are contained in Appendix 8. 1.4.1.6 Test Results (a) The unaged specimen maintained the electrical load as ' given in paragraph 1.4.2.4 throughout the entire profile. The electrical load on the aged specimen was interrupted R3 from the first day at 265'T through the 30th day due to s ! termination f ailure. (See Appendix 10 items 3 and 4). (b) Both samples (cables and splices) passed the 30 and 130 days Post-LOCA withstand tests (40 x OD bend, 80 V/ mil ac, for 5 ininutes immersion in water). (c) A margin of assurance was demonstrated by: (1) Each sample passed the Post-LOCA withstand test twice, once at the 30 day point and again at the 130 day point. The cables passed all withstand tests as described in (2) . paragraph 1.4.1.5. (3) Satisfactory Post-LOCA electrical measurement values. (4) The insulating materials maintained flexibility.
.(5) Adhesion remained between cable and splice.
(6) The cable maintained dielectric strength. Pos t - LOCA breakdowns were greater than 8 times rated voltage. Margin may also be demonstrated when the environmental para-meters of this test are compared to the postulated IOCA
-parameters of a particular nuclear station.
Test data to justify the above are available for audit by the purchaser or his authorized designates. I'4.2
. Test Program Outlined 1 4.2.1 -Each sampic was coiled into approximately a 22-inch coil. The ends were terminated for testing. One of the sm1ples was thermally aged prior to irradiation, both samples were irradiated in this configuration. An epoxy-type terminal was installed on each end. The samples were then instr 11ed in the LOCA vessel. .
The samples were mounted around a vertical mandrel which was made out of 1" x 1". in Appendix 5 expanded steel. The Test equipment physical utili:ed arrangement is included in Appendix is shown6. , . a, _ . . - _ - , - . . . _ . - .
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1.4.2.2 The test program and sequence of environmental factors is out-lincd in Section 1.4.1.3 above. 1.4.2.3 Type 6 Location of all environmental and cable monitoring sensors for each variable.
' Radiation: See attached Isomedix,'Inc. certification, Appendix 3.
Thermal Aging: Forced draft circulating air oven monitored by thermocouple in rear of the oven connected to a cect .m.as readout chart recorder. Temperature during LOCA: Monitored by mercury thermometer and thermocapillary inside the vessel connected to the Taylor Instrument panel consisting of pressure gauges and a tem-perature-pressute chart recorcer. Pressure: Monitored by Taylor Instrument panel. Snray Soluctioni pH monitored initially with pH test paper and test liquid. Flow rate monitored by flowmeter made by Okonite. (Pressure measured before and after an orifice.) Relative ilumidity: A one to twc inch reservoir of liquid was maintained within the test vessel. (IEEE 323, Appendix C.) Steam pressure was allowed to conform to saturated condi-tions. (100% relative humidity.) 1.4.2.4 Rated voltage, SkV, was applied to each sample. 80 amps weta applied initially. As the temperature profile changed the current was re-adjusted to 80 amps. Voltage and current uefe applied to the ends of the samples which protruded thru the vessel. 1.4.2.5 During environmental exposure, insulation resistance measurements are taken periodically. (See Appendix 9.) lR3 1.4.2.6 The following tests are performed after environmental exposure: (a) Post DOCA AC Withstand Tests: These tests were performed per IEEE 383, Section 2.4.4. Charging current is measured by a mil 11 ammeter. (b) Capacitance and Dissipation Factor (% PF): These measurements were taken with the sample at room temperature in air. Measurements were taken at 40 and 80 V/ mil of insulation. (c) Dielectric Strength Tests: An ac rapid rise breakdown test per ASTM D149, para.15(a) is performed on each sample after completion of all electrical tests. (d) Mechanical Tests: Tensile strength and % elongatio.- measure-ments are taken as indicated in the test program out. 'ne. Measurements were performed on dumbbell shaped samples taken from the midwall section of the cable insulation. The ASTM 0470 test procedure is followed.
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l a 1.4.3 Test Result = 1.4.3.1 The intended environmental sequences were achieved. Remal aging was performed with the temperature recorded on the chart recorder. The radiation requirements were met as shown in Appendix 3. The temperature-pressure profile as shown in ' IEEE 323, Appendix A - Fig. A-1 was achieved except for the anomalies (1)gd_G)-described in Appendix 10. Actual tem- E perature and pressures are shown on tie LOCA profile in Appendix 4 of this report. 1.4.3.2 De samples were capable of performing their intended function as nidenced by: (a) Electrical load was maintained during LOCA except during periods riescribed in Appendix 10, items (3) and (4). R' (b) Bothsamplerwithstoodthe30and130dayYost-1~0CA' withstand teses. (c) A margin of assurance was demonstrated. See Section 1.4.1.6(c) above. 1.4.4 Test Evaluation --- Evaluation of Data Tne 130 day Post-IDCA withstand test demonstrated that the samples were in good condition. Charging currents of less than 3mA were measured. Electrical characteristics demonstrated that the cable had degraded, yet was still in good condition when considering the severity and length of the test. Capacitance went from approxi-mately 1100 picofarads to 1000 picofarads. The % PF increased frcxn approximately 0.50 to 0.92% at 80 V/ mil. The insulation resistance decreased from an average of 40,000 megnhms-1000 ft, to approximately 5,000 megohms-1000 ft. AC dielectric breakdown for both samples was greater than 40kV (or 8 tims the rated value of the cable). Percent retention _of tensile strength and elongation were 103 and 41, and 95 and 52 for .he unaged and aged samples, respectively. The cable and splices are considered to have passod the DBE-IDCA qualification test since they met the requirements specified in IEEE 383 and 323 for Class 1E cables, and provided a margin of assurance which is demonstrated in the above datt.
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APPENDIX 2 DEMONSTRATION OF 40 YEAR LIFE FOR MATERIALS This document is designed to present The Okonite Company's . position on the su'oject of demonstration of 40 year life
-at 90'C for materials, as required by the nucicar industry, industry specifications, and various government regulatory agencies. We hope that this presentation will clarify our approach, aid our customers in their contacts with reg-latory agencies, and demonstrate the pitfalls involved in extrapolation of experimental data.
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Appendix 2, page 2 Thermal Aging l To demonstrate 40 year life at 90*C, the approach used most fre-quently is the familiar Arrhenius technique. Data obtained on aging of materials at various elevated temperatures is collected and analyted via this technique. Some comments on the method and the scope and limitations of the method are in order. It should be recognited that the Arrhenius equation is valid only if the data represents a single discreet chemical reaction and the activation energy of that single reaction is within the ten - perature limits of the data. This caustion can be derived from collision theory and has been experimentally verified. It serves to define the temperature coefficient of a discreet chemical re-action and the activation energy of that reaction only within the temperature limits of the experimental data. The' equation is: k = Ae fE k = specific rate constant, A = frequency factor or collision frequency, AE = activation energy - the difference in the energy of a chemical r.pecies in the ground state and its activation state. The activated state is not isolable and has a very short life time (in the order of nano or picoseconds) and collapses either to the original ground state or reactants or to the ground state of the products, R = gas content T = absolute temperature The specific reaction rate constant k reprsents a singic discreet chemical reaction. In the case of a simple uni-molecular first order reaction A >B, the following describes the rate where C = concentration:
-dC A
- kC A
dt that is -- the change in concentration of reactant A with time is proportional to the initial contsntration of A. The differential equation is solved and k determined from experimental measure-ments of concentration vs. time. Distinct values of K must be determined at various temperatures and must, be constant over a considerabic range of conversion in the reaction, say from 20 to 80%, for the data to be considered valid. It can be used correctly only when there are discreet chemical reactions whose rate can be
^* , . . .
Appendix 2, page 3 precisely measured, and described by Jolvable differr,tial equa-tion. A straight line will result from a plot of th. logarithm of the reaction rate k vs. 1/T provided there is no change in the . reaction mechanism. i The Okonite Company in applying this Arrhenius analysis to the aging data utilizes the time to 40% retention of elongation plot-ted on semilog paper against a reciprocal of absolute temperature in degrees Kelvin. Parameters other than 40% retention of clonga-tion can be utilized and have been utili:ed. Some have used electrical failure in water after subjecting the material to high temperature aging for different times and bending around a 10 or a 20X mandrel. It should be recognized that times obtained from this latter type of test are far longer than those obtained from a 40% retention of elongation type plot since the elect;ica in- ' tegrity really depends on the insulation not cracking and the elongations obtained in these bend tests are on the order of 50% or less. Thus, it is emphasi:ed that a 40% retention of elonga-tion time is a very long way from an electrical failure. It is a very conservative measure of life and as such provides a very large margin of safety in terms of circuit integrity in use if one can show that such a parameter can indeed demonstrate 40 years of service before 40% retention of clongation time is reached. In examining the validity of the Arrhenius treatment as applied to thermal aging, it should be noted that there are at least four simultaneous reactions going on -- (1) oxidative cicavage, (2) oxidative crosslinking, (3) thermal cleavage, (4) thermal crosslinking. The first two of these reactions are at least sec-ond order kinetically in that their rate law must depend at a minimum on the concentration of oxygen and the concentration of reacting chemical bonds. Since vulcanized rubber is a compicx mixture of many chemical bond species, there are a multiple of in-dividual rate constants that must be measured. This is an impossibility or at best beyond the scope of current technical expertise. From the above, it is apparent that the occurrence of a linear plot in an Arrhenius treatment of aging data is indeed a fortuitous event. , Since'this is so, i.e., a straight line is really a fortuitcus event, and if careful work is done, it can be shown that there are slope changes occurring in the Arrhenius plot indicating mechanism changes. At lower terpera*.ures, oxygen diffusion rates may be the rate controlling phenomena. These two among other possibilities have differing activation energy, i.e. the slope of the log k vs. 1/T in a chemical reaction study is the activation energy oE in the Arrhenius equation. Other complications can and undoubtedly do arise leading to variations in slope. At The Okonite Company, we recognize these pitfalls and complications, but we take our time to 40% retention of elongation, plot it vs. 1/T and construct via at least square method the best straight line through the experimental data points.
Appendix 2, page 4 l Since the above complications unquestionably do occur, extrapola- ; tion of the lines constructed from experimental data to tem-peratures beyond the measured experimental points is at lest a very risky matter and is indeed not valid, and should not be donc, and will, if done, Icad to errors. In our experience in terms of aging, i.e. loss of clongation, extrapolation to temperatures
' beyond those experimentally measured leads to very considerabic errors in terms of life. We have consistently found extrapola-tions to give lifetimes, i.e., times to 40% retention of clonga-tion, far shorter than experimentally observed when older, well established materials are measured and treated by the Arrhenius technique. To demonstrate this, reference is made to the curves i of charts 1, 2 and 3.
Thi chart #1, the lowest curve labelled Okolite is the Arrhenius plot of aging data to 40% retention of elongation of this in-sulation with-data collected at temperatures between 75'C and 136'C. Temperatures below 75* are extrapolated. Utili:ing this curve, one would predict that 3ko11te (a natural rubber oil based insulation manufactured by The Okonite Company in the past) would have a life, i .e., a time to 401 retention of clongation, of 17 years at 20'C and 7.5 years at 30'c. This latter is say-ing that if Okolite insulation were Icf t at 30*C for 71 years, the sample af ter that time would have retained 40% of its original elongation. A sample of this insulation that has been in service at Hagood Station of the South Carolina Electric 6 Gas Co. for 25 years at an ambient .emperature between 20 and 30*C had 50% retention of its original clongation after the 25 year service period. Referring to chart #2, the Arrhenius plot for neoprene i s con-structed from data collected between 75*C and 136*C. The line is extrapolated to lower temperatures. This line would 1,redict that at 13'C continuous, neoprene would have 40% retention of elongation after 14.7 years. An actual sample of neoprene jacketed cable has been exposed on the roof of The Okonite Company passaic Research Laboratories since 1934. This cable sampic has been examined every five years since then. The time to 40% , The average retention of elongation of this sample was 35 years. temperature is 13 C on an annualized basis in New Jersey. Also shown on chart #2 is a curve of tir.e to 10% retention of clongation of natural rubber insulation of the type manufactured in the late-1920's. Data collected between 75'C and 121*C has been plotted from old Okonite records to-establish the slope _of the line. Temperatures below 75*C are extrapolated. From this plot, one would predict that this natural rubber type insulation would have retained 10% of its original clongation after approximately 6} years at 43'C. An actual sample of natural rubber insulation was obtained from the Duke power Company. This sample had been installed in 1926 and has been in service for 49 years. The sample after this service period had 50% absolute elongation which is approximately 10% retention of the original elongation of natural rubber type insulation manufactured in the late 1920's. , 8 s._ . , , .- ..v. ,.,,_,.,,,,.-...n.,_.mmy_, _ _ - . . , _,._,.,_._-_,,.....,_,,.m.,,_ ._,,_,_.,.,...,,y_, .,,,.y ...y-.- , _,,, ., ,
1 Appcndix 2, Page 5 With reference to chart #3, there is shown the curve for the time to 80% retention of elongation for butyl rubber. Data was col-1ected between 136'C and 75'C for this material with extrapola-tion to lower temperatures From this extrapolation, one predicts a life of approximately 41 years at 50'C. A sample of butyl in-sulation returned from the Southern California Edison Company - Los Alamitos Station which served as a fan cable has been eval-uated. The load on the cable as well as its installation condi-tion was available and the calculations considering the ambient temperature showed that the cabic operated with its insulation for 7 years at 50*C and for 3 years at 40'C. As noted above, the projected life at 50'c is 41 years. The data presented on charts 1, 2 and 3 and the allied unambig-uous demonstration that extracolation of accelerated aging data treated via the Arrhenius tec1nique leads to lifetimes lower than actually observed on real materials that have been in service cicarly points out the major pitfalls of extrapolation of Arrhenius type treatments. Recognizing this pitfall and recognizing the above demonstrated low life projections obtained by extraplation of Arrhenius plots, it is not at all surprising nor mysterious that the Arrhenius treatment plot of accelerated thermal aging data of EP and poly-ethylene shown on chart #1 as the center curve does not, if
' extrapolated, go through 40 years at 90*C.
The curve shown for EP and PE is a masterplot of the accelerated aging data of four different EP compounds and two different cros;- linked polyethylene compounds. Data was collected on all of these materials between 135'C and 180*C. Very recently data on two EP's for time to 40% retention of elongation at 121*C were obtained. The life to 40% retention at 121*C was in excess of 5000 hours whereas the masterplot constructed by least squares treatment of data as noted above predicts a life of a little more than 4000 hours. This 121'C point is not included in the least squares treatment for obtaining the slope but does indicate that the slope of the line is bending upward as long term aging data at lower temperatures is obtained. We have thus far shown that extrapolation of Arrhenius type plots beyond the temperatures where experimental data has been collected leads to low ?redicted lives for insulations. We have further pointed out t.1a t it is therefore not surprising that the extrapola-tion of a plot of EP or polyethylene to 90*C does not go through 40 years but indeed aredicts values between 7 and 8 years life to 40% retention. It s1ould be remembered as pointed out before that 40% retention of clongation is not an end point. On chart #1, there is shown a line that is labelled 40 years at 90*C. This line is constructed by taking the point of 40 years at 90*C and drawing a line parallel to the experimentally deter-mined line. This hypothetical line represents a material that would have times to 40% retention of clongation that when extrap-olated to 90' gives a point at 40 years. The construction of this l l
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Appendix 2, Page 6 line parallel to the experimental EP polyethylene line is justified on the basis that.in general the various mechanisms leading to loss
, of elongation in materials, particularly of the EP and polyethylenn a type are very similar and it is our experience that various EP's and various polyethylenes of rather different compound formulations do indeed give essentially identical slopes.
The experimental line, i.e., that one on chart #1 labelled EP and !
. PE was constructed from data collected on single conductor #12 or :
#14 coated co)per wire with 30 and/or 47 mils of the various in-sulations. Taese samples were aged at the temperatures indicated previously in forced draft ovens.
Samples of these insulated conductors with the various EP and polyethylene insulations-applied at 30 and/or 47 mils have been prepared as multiple conductor cables with an overall jacket. The samples in jacketed form are as they would be installed in a nuclear plant, i.e. a finished cable. These cables were then placed in forced draft ovens at 150, 165 and h80*C for times det= ermined by the 40 year at 90'C. -This_is, at 180*, the samples were in the oven for 360 hours, at 165', they were in the oven for 960 hours and at 150*C, they were in the oven for 2500 hours. After the above mentioned aging times in jacketed form, the samples were removed and tested. The i retention of elongation obtained from the singic conductors after aging for the long times indicated above at the elevated temperatures w2re all in excess of 40% retention. The actual retention values ranged depending upon the specific sample and temperature between 60 and 90%-retention of elongation. It is to be emphasi:cd that the aging conditions in jacketed form simulate the installation condi-tions. Thus, it has been shown that polyethylene and EP aged for times as derived from a line consistent with the aging mechanism of the materials and drawn through 40 years at 90*C do retain better than 40% of their elongation, the parameter used by The Okoni'e Company for its measure of life. However,.it is The Okonite Company's conviction that a more_ con-vincing aspect of the argument for demonstration of 40 year life resides in the comparison of the behavior of EP and crosslinked polyethylene to butyl and to Okolite, a natural rubber insula-tion.--By examining chart #1 at temperatures where actual exaer-imental data were gathered, one can le that EP and crosslin'<ed polyethylene exceed the life of butyl when measured in terms of-40% retention of elongation by a factor of between 6 and 10 in termsHof comparison with the Okolite natural rubber insulation by-even larger-factors. Since Okolite and buty! have performed satisfactorily in power plants and. butyl in nuclear power plants, (40 years + in the case i
-of the natural rubber type insulations, and at least 15 years for butyl in a nuclear plant) it is clear that the much improved behavior of the modern EP and crosslinked polyethylene materials l
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Ag endix 2, Page] in accelerated tests, when compared at temperatures where actual data were gathered, on each of the materials, indicates that the polyethylenes and EP's will outperform the older insulations or at the very worst at least equal their performance. It is The Okonite Company's conviction that comparison of accel-erated aging beha.rior of modern insulations with those of well established insulations having excellent service records is a more reliable and better method of demonstrating useful life for long time periods than the utilization of extrapolations. It is also better and more convincing from cn engineering view that the utilization of the 40 year at 90*C line method described above even though the 40 year at 40*C line method described above is acceptable. The next requirement in qualification of materials for use in a nuclear plant is the preaging to simulate 40 year life followed by irradiation and LOCA simulation per 1EEE 323 and 383. The Okonite Company has presented data where arcaging was performed for three weeks at 121*C and has stated tTat this aging period is adequate to demonstrate the point on the basis of the relative aerformance of EP's and crosslinked polyethylene vs. buty1. There 1as been considerable criticism that this aging period not fall on our experimental aging line for EP and polyethylene. The rationale for utilizing the 3 weeks at 121 C preaging for EP was that this is the time to 40% retention of butyl at 121*C. We have shown the superiority of EP and polyethylene vs. butyl and have pointed out the satisfactory service of butyl so that we feel the above pre-conditioning is adequate. In any event radia-tion and LOCA simulations are being performed on single conductor cables with 30 mils and 45 mil walls of insulation aged for 3 weeks at 150*C which is a point a little above the ext.crimentally determined Arrhenius aging line. It has been shown above that aging single conductors without jacket for 3 weeks at 150*C is more severe than aging for the times determined by the 40 year at 90*C line in jacketed form. We, therefore, maintain that the aging of 3 weeks at 150*C is more than adequate and more severe aging than is required prior to the irradiation and LOCA simulation. It is of interest to note that aging of three weeks at 150*C in jacketed form are less severe giving between 95 and 100% reten-tion of elongation on EP's and crosslinked polyethylene than agings of the same insulations in unjacketed form, i.e., as bare single conductors for 3 weeks at 121*C which gave between 90 and 95% retention of clongation. Indeed aging to the 40 years at 90*C line jacketed give retention of elongation only somewhat more severe than the 3 weeks at 121 C.
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APPENDIX 3, Page 1 of ISOMEDIX Docenbor 27, 1976
- !r. George Dobroushy The Okonite Co.
Canal & Jefferson Street Passaic, :;ew Jersey 07055
Dear 'tr. Dobrowshy:
This will summarize parameters pertinent to the irradiation of electric cable samples and splicos for the Ohonite Coneany, per your order 9-76-509, dated December 10, 1976. A listing of samples exposed to irradiation is attached. Samples were placed in a Cobalt-60 gamma field ranging in intensity from 0.50 to 0.50 megarads per hour, for a period of 400 hours. Cables received a ninimum dose of 200 Mrad. Maximum overdose to any cable vas 1.16 times the dose specified, or 232 Mrad. The samples, mounted on flat boards, vere rotated and turned during exposure to obtain the dose distribution described. Irradiation was conducted in air at ambient temperature and pressure. Radiant heat from the source heated the sanples somewhat, but the tenperature did not exceed 1000F, as indicated by previous measurements on an oil solution in the sane rolative position. Dosimetry was performed using a Victoreen flodel 555 Integrating Dose Rate Meter and Probe. The unit was calibrated on October 16, 1975 by the Victorcen Instrument Company, using. Cobalt-60 and Cesiun-137 sources whose calibrations are traceable to the U.S. National Dureau of Standards. A copy of the calibration certificate is available. Backup dosimetry using a ned Perspex System confirmed the Victoreen readings. Irradiation was com91eted on December 15, 1976. Samples were picked up by your personnel and transported back to Ohonite on Decenber 16, 1976. Very truly yoIrs,
,. ny k -
George R. Dietz Att. ?ta naqcr , nadiation 9ervices G3D:hn isomedix inc.
- 25 Eastmans Road. Parsippany, New Jersey (201) 687-4700 u..... ....... eni cm. i, , , e. ..*. , ~. . ;-. , o ,c,.
CHICAGO DIVIStoN e tsrsN.v a.e.useioaom.e mese n mi e two ..
s APPENDIX 3, Page 2 of 2 p
- Ohonite Entples for irradiation 200 !1 rads nepairs 2 factory repairs per sanple ,
- 1) #12 7x .030" Ohonito............... unaged r, thermally aged
- 2) 112 7:: .030" FMR X-Olene.......... 2 unaged, 2 ther.9 ally aged
- 3) #6 _7x .055" Okonite, 030" Okolon.. Unaged & agc:d
- 4) #6 7x senicon, .090" Okoguard, senicon, .005" copper shicid.... Unaged & aged
-!!eu Compounds i
- 1) #12 7x .030" Firmer Ohonito .015"CPF......Unnged & thermally aged
- 2) #12 7x .030" Firmer Okonite............... "" " " "
- 3) #12 7x .030" Flame Retardant Okonite...... " " " "
- 4) #12 77. .030" Flame Retardant Ohonite...... " " " "
- 5) #12 7x .030" F:tR X-Olene tyne............. " " " "
G) #12 7x .030" FMR X-Olene tyne............. " " " "
- 7) #12 7x .030" F!1R X-Olene type.............
Field. Splice I sxv #6 Okonuare Field splice for toex.........unaaed a thermally oned SKV_46 Okoguard Field Splice for test after " " " " irradiation............ T Plus various short samples of the above compounds and others for physical property tests after irradiation. ( i. i
- l. Imomedix inc. - 25 Eastmans Road, Parsippany, New Jersey (201) 887-4700 Ma *g Aeoeess Post OHice Bos 177 P.rs:p.ay N** Jee.ey O'054 CHICAGO DIVI $lON
- 7eas m.ew A . unnea G*ove m.a** 6MS1012, te+"M
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A13PENDIX 5 i'llYSICA l, AltitANGICM10NT 01' CA13 LE tVITillN LOCA VESSEL
- Thermometer
- r. .
r.i:
/
O Lines to Pressure ~'
-Guages p w:n g S m . Jacket Steam
" essel Sample a N
Flow-meter
- ,/
y
/
Sprayer % vq . , o Thermocapillary _ ,
\\
d
~
- S;,Pa.
Support
\ -seg-g -,
t '- (. - Res ervoir (Pum C l L THE PH YSICAL ARRANGEMENT OF CA BLE WITHIN LOCA VESSE L l " " THE OKONITE COMPANY- ['Ia - oa I 07o '
.. -~ RAMSEY. N.:J U. S. A. . e g, , , , ,
-.-- ~ . _ . __ __. . _ . . . _ _ . _ . u__ .._ _ _ . _
- . e
}'
it 1 <~'-, TH3 OKONITO COMPANY
%) % %*nwy anao APPENDIX __6 R..
b LIST OF EQUIPMENT n u-The_Okonite Company's Quality Assurance Department maintains a program which includes as_found corsdi-tions, frequency status identification, and the use of, calibration standards traceable to NBS. The electrical equipment used in Okonite LOCA tests has been calibrated _and-certified by either Electrical Testing Laborar.ories or Electrical Calibration Laboratories on a yearly basis. Tolerances for each instrument were determined by The Okonite Company. The test equipment accuracies are in Okonite's Manufacturing Standard. Section C.11.02 (7/17/79)
'" Equipment Calibration Accuracy and Requirements,"
Section 8.11.02 and calibration reports written by the above testing laboratories are available for audit by the parchaser or his authorized designates.
~.. .
r'} TH3 CK'3NITO CCM?ANY wj w m w su m crn a o .
,_ A FPENDIX ,6. page 2.
LIST OF EQUIPMENT 1 Power Supphes A. 100 kVA Testing Transformer-General Electric 0-50 kV Serial #D938528 l D. 10 kVA Transformer General Electric 0-50 kV ' Serial 62833724 l C. 200 kVA Transformer ! Westinghouse 0-200 kV ) se. rial w 235. 230 D. 20 kVA Transformer Nothelfer Winding Labs , Inc. , 0-100 kV Model 1D 7-67 E. 4 kVA Transformer Hipotronics 0-20 kV
)todel 720-2 F. Current Transformers - (2)
Scientific Electric G. 2. 5 kVA Transforme r Power Supplies - (5) Nothelfer Winding Labs. , Inc. 0-5 kV Model NWL 19082 - Units No.1 through 5 H. Powerstat 0-230 volts Superior Electric Co. Model No. MZ 1256-2P
- 2. Measurement Equipment A. Ammeters 1 Weston Multiscale Clip on AC Ammeter 0-100 amps Model 633
- 2. AC Mil 11 ammeter 0-1 amp Simpson Model 288
THJ CKCNITO COMOANY v 84vvweg %.asrwy CT2148 A PPENDIX 6, oage 3 B. Insulation Resistance Meters 1 Leeds & Northrup Insulation Resistance Test Set Catalog #2100 Galvanometer Catalog #2500F
- 2. Hipotronics Megohmmeter 1 to 107MDModel HM 6 B Unit #1 - Serial #3810-1028 Unit #2 - Serial #3810-1080
- 3. Associated Research, Inc.
1 M ohm to 1 T ohm Unit #2 - Serial #534 4 General Radio Megohmmeter Model 1862 Serial #3323
. C. Capacitance & Dissipation Factor Equipment
- 1. High Voltage Schering Bridge F & G Neptun F #150255 MF01
- 2. Capacitance & Loss Factor Bridge Hartmann and Braun Model EH/G16 Serial #25151'
- 3. Gas Filled Standard Capacitor - 100 picofarads General Electric Serial #HV-1M-63-107-A .
- 4. Oil Filled Standard Capacitor - 100 picofarads R. Jahre Berlin W35 F. No. 6918
- 5. Gas Filled Standard Capacitor - 205 picofarads Lapp Serial 39.16
-D- .m,.. n. .- .g _ _, . n, ,
. , . = _ _ - -_ . _ _ _ - - _ , . - . . _ . . . - . .
- TH3 OKONITO CCMPANY he t h JrrtW CT114G s
A PPENDIX 6, pa g e 4 MISCELLANEOUS EQUIPMENT 1 Okonite Flowmeter .150" orifice. 0-200 psig - Pressure Gauge j Cranford Sectional Oven with Honeywell Temperature Indicator 0-200 C, Model No.18 IC, Serial #678672001 Scott Tester, Scott Tester, Inc. , Model L 3, Serial D 4260 f LOCA Chamber 24" ID, N. .Y. Engineering Co , Manufactur e # 57003 l NB #650 i Pressure & Temperature Monitoring Equipment Taylor Instruments, Serial rtD251R2231-613 1 l l (. t. l 3.- . - .. .. . - , ,
THE Post Of fica Box 340 Ramsey, New Jersey 07446 l
., @l OKONITE - 201-825 03OO/Caete Okon,te APPENDIX 7 j MOISTURE RESISTANCE
, l.ong tem moisture stability is one of the essential factors in the i I
selection of an insulation for many applications. It is not unusual for a power cable to be required to operate in an environment alter- ! nately wet and dry. To determine the long term water stability of a cable, ; sample insulated with a thin wall dielectric is imersed in water Ce an elevated temperature to accelerate the deteriorating effects of moisture. . Monitoring the electrical properties provides an ' indication of long tenn behavior. Based upon actual experience with installed cables over many years, insulations which have the
~
capability.of withstanding total water imersion at 900 should oc capable of a life in excess of a generating station's designed life in an environment of 100% humidity. . Figure I shows long. term 90C water imersion on a 1/C #14 AWG Okoguard
' insulated cable, and Figure I-A shows comparable data on a I/C #4/0
- AWG Okoguard insulated power cable.
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___.__S j j. APPENDIX 7_(Page 2) {
+- i FIGURE I LONG TERM M0ISTURE RESISTANCE
\
l Method: ICEA S-68-516, Section 6.21.2 except (1) water temperature at 90'C, (2) test time extended, (3) ac withstand at 110 volts ac/ mil at 90'C after electric 41 measurements, and (4) 600 volts de continuous stress applied. Samplei 1/C #14 AWG Solid Copper, 0.045" Okoguard l l Measurements shown below are average of three samples, i Immersion Stress Time Volts / mil (de) SIC _, % PF SIR
- 1 day 40 2.81 1.89 849 )
80 2.81 1.92 I week 40 2.85 1.45 1220 , 80 2.85 1,61 , 2 weeks 40 2.89 1.40 1314 80 2.89 1.43 1 month 40 2.93 1.29 2276 ' 80 2.94 1.31 2 monthe 40 2.99 1.27 2186 80 2.99 1.42 3 months 40 3.04 1.21 2498 80 3.04 1.2* 4 months 40 3.08 1.06 3388 80 3.09 1.09 5 months 40 3.12 0.98 2612 80 3.13 1.03 < 6 months 40 3.17 1.01 4132 80 3.18 1.04 l
i
- APPENDIX 7 (Page 3) l 1
e FIGURE 1A j LONG TERM 9000 WATER IMMERSION l l Sample: . 1/C #4/0 AWG (19 x .1055) bare copper, 0.025" EP Semicon, '
.175 wall of Okoguard 3 sample with 14.0 kV ac (80V/ mil) continuous stress (E0 03-96548)
Measurements at 900C i Time Stress P.F. SIC SIR , Period V/ Nil % Constant (mco. ohms) 3 days- 40 2.09 - 2.99 505 80 2.12 2.99 -
~
I week- 4C- 1.85 2.97 673 80 1.94 2,97 - ' 2 weeks 40 1.71 + 2.98 932
;B0 1.80 2.98 -
I month 40 1.88 2.95 1475 80 2.03 ~2.95 . 12 months 40 1.71 3.13
- e45
'80 1.77 - 3,13 -
4 months 40 1.37 - 3.06 2881 80- 1.42 3.07 - 6 months 40 1.48 3.07 3858 80 1.61 3.07 -
= , ~ - - -e e - ,i' - e-- --m e
-s TH] OKONITC CCMPANY j Rwvway twwew 02*M2 APPENDIX 8 1
FLAME TEST QUALIFICATION for OK0 GUARD INSULATED OKOLON JACKETED MEDIUM VOLTAGE POWER CABLE The attached flame test summary sheets den-enstrate that Okoguard insulated - Okolon jacketed medium voltage power cables are capable of meeting the flame test require-ments of IEEE Standard 383-1974, Section 2.5.
'averal tests have been perf ormed to dem-onstrate compliance to the IEEE flame test requirements for a wide variety of Okoguard-Okolon constructions.
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YH3 OKONITO CQMMNY . W hnw.anwyo m e APPt4 DIX 8 (Pap 2) VERTIC AL TRAY FLAME TEST 1 IEEE STANDARD .98 3- 1974 i l l Criteria: The flame test should demonstrate that the cable does not propagate ' fire eve s if its outer cover (ug and insulation have been destroyed in the area of flame 'mpingement. Test Specimens: Test specimm are specified in the attached table. , Xire Test Facility and Procedure: The test should be conducted in a naturally ventilated room or enclosure free from excessive drafts and spurious air currents. The tray is *a vertical, metal, ladder type tray, 3" deep,12" wide, and 8' high. Multiple lengths of cable are arranged in a single layer filling at least the center six inch portion of the tray with a separation of approximately 1/2 the cable diameter between each cable. The flame source is a gas ribbon burner manufactured by the American Gas Furnace Company -- 10" wide, 11-15 drilling tibbon type Cat. No. , 10 X11-55 with a Venturi mixer Cat. No. 14-18 (2 psig max. ) The burner is mounted horizontally such that the name impinges e i the specimen midway between the tray rungs and so that the burner face
, is 3" behind and approximately 2' above the bottom of the vertical tray. Due to its uniform heat content, natural grade propane is preferred to commercial gas.
Under dynamic conditions, the propane pressure is -2,6f 0,3 cm of water at the supply side of the Venturi mixer. The air pressure is set at 4. 3i 0. 5 cm of water. If commercial gas is used the gas and air pressures shall be -0. 910,1 and 5. 610. 5 cm of water, respectively. In practice the flame length is approximately 15 inches long when measured along its path. ; The ga.s burner is ignited and allowed to burn for 20 minutes. The impingement temperature is recorded throughout the test. Length of time the flame persists after the burner is shut off (afterturn), jacket char distance, and insuhtion damage distance are measured and recorded. Evaluation: Cables which propagate the flame and burn the total length of the tray above the flame scurce fail the test. Cables which self-extinguish when the flame source is removed pass the test. Cables which continue to burn after the flame source is shut off should be allowed to burn in order to determine the extent.
APPENDIX 8 (Page 3)
,4 15 kV Okoguard Shielded Okolon Specimen: (A). 1/C 250 MCM (37x) BC, extruded strand screen, 220 Okoguard insulation, extr. insulation screen, _ .005 tinned copper tape,
.080Okolonjacket(FL-141,228)
(B) 3- /C triplexed 250 MCM (JJ s) BC, extr. .c , ?20 Okoguard insulation, extr. insulation screen, .000 tape, .080 Okolon jacket (FL-196) (C) 3/C #4/0 (19x) BC, extr. 55.175 Okoguard insulation, extr, insulation screen, .005 TC tape, cabled with fillers, .110 Okolonjacket(FL-96) Results: A B C Afterburn, minutes 0 0 0 Jacket Damage -inches 21 23 25.5
' Core Damage, inches 0 0 0 Propagate No No No Avg.
of 2 tests . 4 9
APPENDIX 8 (Page 4) Test:- IEEE Standard- 383-1974, Paragraph 2.5 Flame Source: Ribbon Gas _ Burner Sample Construction: 1/C#4/0(19x)CC,strandscreen,.140"Okcguard insulation, insulation screen, .005" TC shielding tape, cable tape,
.080" 0kolon. jacket (FL-199, 200, and 201)
Test- Test Test Results: 1 2 3 Afterburn, minutes; seconds 1:05 0 0
'2cket damage, inches 28 25 26 Core damage, inches 12 4 12 Propagate _ NO NO NO
(-, 1
.. . . . . . = * *
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TH3 OKONITO COMPANY , % tsw e vc m APPENDlX 8 (Page 5) 1/C,5 & 15kV Ckoguard Constructions 1 Construction At 1/C #2 AWG, extruded strand screen, .125" Okoguard insulation, 080" Okolon jacket - non-shielded Construction B: 1/C, 4/0 AWG copper, extruded strand screen, .175" Okoguard insulation, extruded insulation screen, copper tape , . 080" Okolon jacket Flame: 70,000 BTU per hour Test Time, Flarne Height, (Inches) Minute s A B 1 27 27 2 20 25 3 33 24 4 34 27 5 33 26 6 33 27 7 32 28 8 29 28 9 29 28 10 28 28 11 28 28 12 30 27 13 29 26 14 29 26 15 29 26 16 30 27 17 30 29 18 29 27 19 28 32 20 28 34 Afterburn, min : sec 3:05 1:05 Core Damage, inches No Measured 27 Jacket Char, inches 25 29 Propagate No No
TH] QKCNITC3 COMPArJY y~]i/
- s. % t*waarsev m APPENDIX 8 (Page 6) c 1/C S kV Okoguard Shielded Okolon Specimen: A - 1/C 750 MCM (61 X) bare copper, extruded strand screen, . 09G" Okoguard, extruded insulation screen, . 085" tinned copper, cable tape, .080" Okolon jacket (FL-179)
B - 1/C 250 MCM (37 X) bare copper, extruded strand screen, 115" Okoguard, extruded insulation screen, . 005" tinned coppes , cable tape, .080" Okolon jacket (FL-132) Flame Source: 70,000 BTU / hour -- 20 minute application i Results: A B Impingement Temperature, F 1400 to 1500 1400 to 1490 Afterburn, minutes 0 1 Jacket Damage, inches 26 26 Core Damage, inches 0 12 k p
'~' TH] C KC NtT] COMI'ANY , (./ W hh CN*E APPENDIX 8 (Pcge 7)
FLAME TEST DATA Test: IEEE 383-1974, Paragraph 2.5
-Flame Source: Ribbon Gas Burner, 70,000 BTU /hr.
Construction: 1/C #2/0 WG, 19X BC, SS, .115" Okoguard,
.030" Semicon, .005" Cu Tape, Cable Tape,
.080 Okolon.
Test Results: A B C Measured BTU rate 71,051 71,051 70,116 Afterburn, min: 10 11 9 Jacket Damage, in. 24 25 23 Core Damage, in. 14 15 14 Propagation No No No 1
iTHE OKOPJITU COMPANY j R:msey, New J;rsey 0744G "' R4 APPENDIX 9 INSULATION RESISTANCE Mecohm - 1000 ft. Okocuard Cable With T-95/No. 35 Solice Time & Temnerature Unnaed Aced Initial (pre-irradiation) 0 68 0F 2.1 E4 3.0 E4 Pre LOCA 9 600F 3.4 E4 >1.5 E4 First Peak 9 3440F 1.5 EO 8.8 E-1 Between Peaks e 208 0 F 6.0 El 5.3 El 2nd Peak 9 3450 0F 7.5 E-1 5.1 E-1 Plateau 9 335 F 8.3 E-1 6.2 E-1 Plateau 6 3150 F 1.1 EO 9.5 E-1 After 1 day,. 265 0 F 5.1 EO <1.5 E-3 0 50V* After 4 days, 265 0 F 4.1 E0 <1.5 E-3 0 50V* After 11 days, 2120 F 3.6 El <1.5 E-3 0 50V* After 17 days, 212 0 F 4.5 El <1.5 E-3 9 50V* After 25 days, 212 0 F 5.0 El <1.5 E-3 @ SOV* 2120 F
'; After 29 days, 5.1 El <1.5 E-3 0 SOV*
After 30 days, 80 0 F 3.8 E3 <1.5 E-3 0 50V* After 35 days, 2120 F 5.7 El 8.4 El After 49 days, 2120 F W T1 9.8 El After 63 days, 212 0 F 7.5 El 1.1 E2' After -77 days, 212 0F 9.0 El 1.3 E2 After 91 days, 212 0 F 7.5 El 1.1 E2 After 105 days, 2120 F 9.0 El 1.3 E2 After 121 days, 2120 F 9.8 El 1.3 E2 After 128 days, 212 0 F 9.9 El 1.3 E2 After 130 days, 80 0 F 5.3 E3 4.8 E3
- After the sample'was removed from the test vessel it was deter-mined that the roor IR was the result of a terminal failure.
Sample!was.treterminated and test was continued. All IR tests were performed at 500 volta dc unless otherwise in-dicated. . Prepared by: A1 f2 /Ok k I Approved by:/
/ IJ. R. Cancelosi' g'/ J. S. Lasky 2
,a THu OKONITJ CCMPANY A) nmm NonW CN Page I of 2 APPEN' DIX 10 ANU MLIES Anomalies which occurred during environmental qualification test are listed below.
(1) The rise time to 280'F was approximately 30 seconds. Discussion: IEEE 323-1974 Appendix A, Figure A1, suggests a 10 second rise to 280'F. This anomaly was not deemed significant ! ace electrical cable is a passive electrical device (i.e., no moving parts). As such, rate of temperature rise is not considered significant. (2) A temperature excursion occurred during the 79th hour. The test vessel temperature rose from 265'F to 293*F and remained at this temperature for approximately five hours. Discussion: This event made the LOCA sequence more severe than designed. No adjustment to the test was necessary. (3) The continuous stress voltage was off for the first twelve hours at 265 F on both the aged and unaged samples. Discussion: The twelve hour loss of voltage on both samples is less than 0.4% of the tetal test time and is therefore ccasidered in-significant. (4) The continuous stress voltage and current was disconnected from the aged sample from the twelve hour point during the 265 F plateau until the thirty day point. Discussion: The voltage and current load was disconnected because of a temination failure. The temination failure could not be cleared until the vessel was unloaded at the thirty day point. The aged specimen was reteminated, passed the 30 day " Post LOCA Withstand Test" and rewrned to the test vessel for continuation of the test. Environmental qualification was not jeopardized due to this un-scheduled event because of the following reasons: (a) During the time voltage was applied, the test voltage was nuch higher than required. The test voltage was SkV phase to ground. IEEE 383 requires that the specimens be en-ergized to rated voltage. The cables rated voltage is SkV phase to phase. The required test voltage is 2.89kV phase to ground (shield). Although the test under voltage stress was reduced by approximately 29/130 or 22.3%, the voltage stress was 73% higher than required. The higher stress more than compensates for the reduction in time. (b) If the specimen was in a marginal condition, it could be argued that the 29 days under an electrical load could pos-sibly have been the difference between passing or failing the test. However, this was not the case. An examination
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RPENDIXs10(Continued) of the electrical and physical measurements reveals that the sample was in good condition with plenty of margin at the end.of the:130 day test.- In particular, insulation resist-ance measurements of the unaged and aged specimens during and after LOCA were similar. At 212*F the insulation resist- , ance was-in the-hundred megohm-1000 ft. range. Post-LOCA SIR corrected to 60*F was approximately 40,000 M ohms-1000 ft. The guaranteed:value for this insulation when new is 50,000.
- During the Post-IDCA 40x0D bend withstand test, a-charging.
current of: only -2.5mA was measured. . 'Ihis value is similar to -
-that expected from new cable. In addition, the rising volt-age breakdown strength for the aged specimen was 48kV, approx-imately 16-times. higher than the phase to ground rating of the cable.
Physical tests also demonstrate the margin available at the
-end of the test. Both the unaged and irradiated and the thermally aged and . irradiated specimLns had similar tensile and elongation values prior to IOCA (i.e., after -irradiation -
to 2 x 10' rads). Tests perfonned after LOCA sinulation demonstrate similar changes between the unaged sample, which was continuously loaded, versus the thenna11y aged samples which saw the interruption of the electrical load. Thenna11y Unaged Aged-
!After-2 x 108 rads Tensile, % Retention 121 113-Elongation, % Retention- 33 30 After LOCA Sinulation Tensile,.% Retention 103 95 Elongation, % Retention 41 52 7
). Prepared by: Cn d af27ff7 J. R. Cancelosi' / Approved by: 8
- g. J. S. Lasky '
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