ML20050C975

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Main Steam Line Break (MSLB) Test on Aged & Irradiated Cable Specimens
ML20050C975
Person / Time
Site: Sequoyah  Tennessee Valley Authority icon.png
Issue date: 05/07/1980
From:
UNITED TECHNOLOGIES CORP.
To:
Shared Package
ML20050C841 List:
References
RTR-NUREG-0588, RTR-NUREG-588 IEB-79-01B, IEB-79-1B, PE-53, NUDOCS 8204090461
Download: ML20050C975 (5)
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Text

{{#Wiki_filter:%/ J ,y/\\.tr 3-J FILE ESSEX GROUP, INC. POWER CONDUCTOR DIVISION PROJECT REPORT I Report Number : PE-53 i ^ 0 ED n i,,,',,',,",, [,,,,,,,,,,,. Date: May 7, 1980 Centracter f re's esy eart of his resseeslJ tility for the correctness el destte. detaf's os...es.ies. IEMMESSEE V ALLEY AUTHOR 6TT SEP 2 31980 sa ' ~ ' y.w. in An otre TITLE: I MAIN STEAM LINE BREAK (MSLB) Test On Aged And Irradiated Cable Specimens PROCEDURE: Manufacture and prepare samples of Class 1E cable for aging and subsequent submittal to Isomedix, Inc. for irradiation and simula-tion of Main Steam Line Break Temperature and Pressure Profile. CONCLUSION: Specimens of Class 1E EP insulated conductor having successfully withstoodtheeffectsogheatagingto40yearsat90C, irradiation to a level of 2.05 x 10 Rads (C 60) and a MSLB temperature and pressure profile according to the requirements of the TVA Specifi-cation are judged to be fully qualified for service according to the referenced specifications.

REFERENCE:

TVA Specification 25.016 Item 93 Contract 6-825722 Isomedix Radiation Certification Essex Arrhenius Plot (Class 1E EP) Respectfully submitted, ^ 'w SEOUOYAH J. L. Steiner C204090461 B20407 DR ADOCK 05000 Chief Engineer ,,a...

d Page 2 PE-52 Mai d tcam Line Break J'[.jMay8,1980 JLS QUALIFICATION CRITERIA: Specimens submitted shall withstand the following exposure. All specimens shall withstand all tests with the exception that both thermally aged and unaged cables shall be submitted. t 1-Heat aging - where applicable - for 140 hours at '162C. Arrhennius Plot available. 2-Exposure to Co60 source to a total exposed dose of 200 Megarad at a rate of exposure not to exceed 1 Megarad per hour. 3-Temperature and pressure specified for the' time specified by the TVA contract 6-825722. 4-Withstand application of 80 volts / mil of insulation for 5 minutes. DISCUSSION: Three specimens of single conductors (#12 AWG,.030" wall Class 1E EP insulation) were aged in a circulating air oven r for 149 hours at 162C and two (2) were not. Specimens were-subjected to the radiation from a. Cobalt 60 source to a total dose of 205 Megarads. The specimens were then coiled onto a mandrel and inserted into a pressure vessel.. At this point the vessel was flooded and the insulation resistance (IR) was measured. One specimen gave a comparatively low reading but the decision was made to test. Steam. was admitted to the vessel to simulate the pressure, temperature and time of the postulated MSLB event according to the profile attached. Steam was readmitted to the levels shown in the profile to provide test margin. Specimens had IR measurements taken at the two ensuing 346F plateaus. The vessel was cooled, the specimens removed and subjected to 2400 volts AC (60Hz) while submersed in tap water. End of i Test. 1-s I 1 l

/.*[d ~PE-52 Ma Steam Line Break aga 3 ( r * {, 'l May 8, 1980 JLS p i DATA: SPECIMEN # AGED IR1 IR2 IR3 IR4 HiPot 1 YES 14T .28T 2.5M 39M OK l 2 YES 8.2T 35M 35M 1.1M OK 3 YES 11T 1.3M 1.1M 1.3M OK 4 NO 2.8T . 4T' 18M 19M OK 5 NO 17T .4T 26M 6.4M OK After aging (if applicable) before irradiation NOTES: IR1 After irradiation IR2 First 346F plateau IR3 Second 346F plateau IR4 / T 1012 ohms M 106 ohms 7 d ) -,.,.-._.,m__ y

i I..... v 2- ?:,' g l-a { ISOMEQlX December 20, 1979 To: Richard Prins Component Testing i From: - David P. Constantine Production Manager

Subject:

Irradiation for Essex International This will summarize parameters pertinent to the irradiation of one (1) double mandrel wrapped with 31 cable samples as per your SRR No. 0047, dated Octob.er 29, 1979. The mandrel was placed in a Cobalt-60 gamma field and exposed at each of 4 quadrants, as marked on the mandrel.. Ey integrating ~ the dose rate at any point on the mandrel during its 4-position ~ exposure, an average dose rate was obtained which, when multiplied by the total exposure time, yields total dose. i The mandrel was exposed for 289 hour.s at an average dose rate of f 0.71 megarads per hour. The calculated dose based on dosimetry N is 205 megarads. In'corporating the 13% accuracy of the dosimetry system, therefore, the reported minimum dose is 200 megarads. Dosimetry was performed using Harwell Red 4034 Perspex dosimeters, utilizing a Bausch and Lomb Model 710 spectrophotometer as the readout instrument. This system,is calibrated directly with NBS, with the last calibration being May 30, 1979. A copy of the dosimetry correlation report is available upon request. Irradiation was conduct'ed in air at ambient temperature and pressure. Radiant heat from the source heated the samples somewhat, but the 0 temperature did not exceed 90 F, as indicated by previous measure-ments on an oil solution in the same relative position. Irradiation was initiated on November 9, 1979, and was completed on December 29, 1979. hw w David P. Constantine DPC:vt ( Isomedix te r.. o c r...---. n -.. n-...---.. u.

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