ML20050C896
| ML20050C896 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 02/27/1980 |
| From: | NAMCO |
| To: | |
| Shared Package | |
| ML20050C841 | List:
|
| References | |
| RTR-NUREG-0588, RTR-NUREG-588 IEB-79-01B, IEB-79-1B, NUDOCS 8204090442 | |
| Download: ML20050C896 (7) | |
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february 27, 1980 Revised?**
July 17, 1979 Revised 1.
~ - Apii1 26, 1979 Revisede' April 12, 1979 s
EST!MATIC!: OF QUALIFIED LIFE OF EA740 SERIES f:UCLEAR SWITCH Swi.tch P/flo. CA740-20000 Rev.
C, D or E Date of Qualifiention Report 2/20/7E and 2/22/79 The llamco Cont rol s cual i fi cat ion test procedure for,the EA740 ::uclear S.ti tch includes thermal aging at 200 F (93 C) and 1007. R.H. for 200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br />.
The purpose of this report is to provide a corresoonding estimated quali ficd 1i fe.
As a result of an Engineering study, the lever shaft o ring and the co er c a s': c t we re de.e rmi ned to be the switch components most sesceptibic to t h e rr.c l aging.
During our Engineeri ng s tudy, the plastic parts and lu-b rica :n we re reviewed.
The piastic parts are all Thermcset plastier and are not considered in this investigation because they hr.ve been used for E years in our standard swi tchcs for i ndust ri al a:alications without detectable deterioration.
The l ub r i c ar.: mc.cf acturcr was unabic to provide thermal ag-i nc ci.a rac te -i s t i cs for the synthetic lubricants useo in Q
these switches, hcwever, our' experience indicates that the
( j application of, and proper amount of lubricant, is more crit-i cal than the thermal aging characteristics of the lubricants.
The cover nasket materi al is a complex compound on !!BR.
(t!i t ri l e-Su radi enc Rubbe r) and Asbestos Fibers.
The I:ER is appro>:imatel y 20% of the compound.
The finished gaskets are impregnated with a polyester plastic to seal minor pores.
The manuf acturer of the material was unable to provide test data regarding the aging characteri stics of the materi al.
It was determined that a conservative approach would.be to estimate the 1ife of the fBR alone, i
Aging calculations were made using the Arrhenius equa-tion, as demonstrated in IEEE 382, Ref. 3.
An acti vat i on energy of reaction (eV) f actor of.958 was used.
This f actor was derived from an article published by the r:ational P,u r e au of S tandards in 1959 (Ref. 1).
The following chart lists the calculated quali fied life for various ambients (based upon stated aging conditions).
8204090442 820407 PDR ADOCK 05000327 P
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February 27, 1980 Revised"**
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- April 12, 1979 Page Two - Cont.
AME l Et:T OUALIFIED LIFE 30'C 12.9 Years 35,C 7.l' Years 40 C 4.0 Years The lever shaft o rino is an Ethylene Propylene com-pound and manuf actured by Pari:er Seals.
Pari.er Seals conducted a very comprehensive aging test and computer study (Ref. 2).
The results of this tes; were as follows:
1.
At temperatu res more than 100 F below maximum rat i r.cs fo r the material, seal life appeared te bc independent of thermal. aging.
2.
Pred'icted seal li,fe f'or the ambient tempera-J tures of 55 to 75 C ranged from 5 to 15 years.
==
Conclusion:==
As a resul t of the thermal aging study, ring will not be considered a f actor in the Icver shaf t o the quali fied li fe estimation.
Based upon this study, t,he e s t,i ma ted qu al i fi ed l i f e of -
a switch assembly aged at 200 F (93 C) f'or 200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br /> will be based upon the cover, gasket estimation of 4 to 7 years for ambients of 35 to 40 C.
This report is based upon the best Engineering i nforma-t ion avail cble to us on thi s date.
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Iebruary 27, 1980 nevised***
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s July 17, 1979 Revised.'-
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April 12, 1979 O
Page Three - Cont.
References:
- 1. ' Journal of Research of National Bureau of Standards, Volume 63C, 1959, Measurenent of Acint of Rubber Vulcanization, J. Mendel, F. L.
Ro t h, ' l4.
I'.
Steel and R.
D.
Stiehler.
2.
Stress Relaxation Long Term Aging, EA740 ' tJucl ear, Rehort tio. 10, 4781, January 10, 1979, Parker Seals, Culver Ci ty, Cali forni a, 90230.
3.
I EEE 382 A::s t -::41.6. Graft 3, Revision 6, Nover.ber, 197E, Tri al-Use Guide for Type Test of C1 ass l Electricci Vcive (parators for Nuclear Power Gen-erat ing S tctions.
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Prepared By
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Sencohaitis P roj ec t Engineer Nuclear Switch Coordinator Approved By
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.'. Joseph Buzogany
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' Chief Engineer
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O Letter to Tennessee Valley Authority TVA contract 73C38-83530-2 November 20, 1980 Pace 2 are fulfilled by cutting to length specified on the purchase order and Barton Standard length is thirty (30) inches. Anything else is special.
register.
Document number 11.113, Components for Radiation RI-8344-5 Environments Wire Radiation Resistant 9999.2278,2 18 Gage Wire Radiation Resistant 9999.2267.2 22 Gage Terminal 0038.1175.T Material Specification 006H.0004.T Sincerely yours,
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Edward Zepeda O.
Applications Engineer Dtiferential Pressure Instruments EDZ/the TIC Tennessee Instrument Company, Inc.
et ITT Barton register 011551-00-00 ITT Barten register 06048 Master File ITT Barton register 06048-00-17 E nc los ur e s c Iy. % - PV :PA:
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A Unit #1 laterestws/ Talspeess set Talsprope Corps < stems
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100 $ TwsheM Casyse Rd
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~ o~~ zo. ~o Tel (1131,96126,1 rs,s.,, m Tenriessee Valley Authority W8Cl26 Commercial Realty Management Building 80120800476 @
400 Commerce Avenue 37902 too. vine, T.nnes s ee T,W. Chandler t,
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011551-00-00 ITT Barton ragister n
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lification for The following is submitted as evidence of radiatlon qua Model 288A d register, switches supplied to WA on the above referenceh 28662 are made 288-28651 throug indicating switches serial numbers up of the following part numbers:
Dsttcriptfor)
Port Number Low switch assembly DP DT S401.0110.Z radiation resistant wtre I
Along with the drawings of the part numbers noted above, are included External wiring assembly S666.0201.Z eleftt (8) feet long Externet wiring assembly S666.0201.Z eight (8) feet lang In particular,
dividual components.
the sub-aesemblies which identify the Inber 0068.0004.T. The switch the snap action switch is Barton part nurn Tool Worka, Incrwporated,
Ie purchaeed from Ucon Divieton,1111nons The Ucon switch was 6615 West Irving Park Road, Chicago, Illinois.in Barton Doc ument Pl-83 44-5, which
-E,R tested and the results are publishedNote that the length of the external wtre assemblie This is done f
8666.0201.Z and 8666.0203.Z, is twenty (20) feet long.The customer requirements t o e nc los ed.
to avoid unnecessary inventory at Barton.
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201-4.6'7-8400 ORIGII;ATOR DATA TRANSMITTAL FORM Chief, Elch, Eng._. Br,anch PROJECT:
Contract 80 KJ3-826034 TO:
Tennessee Valley Authority SeqkovahNuclearPlant WW!"
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80 JK3-826034 S/0, ; _ E17168 ATTN:
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