ML13330A211

Insulation Sys Evaluation - 600V - Safety Class IE for Svc to One Billion Rads Random Wound Motorette. Two Related Ltrs Encl

ML13330A211
Person / Time
Site:	San Onofre
Issue date:	02/12/1981
From:	AFFILIATION NOT ASSIGNED
To:
Shared Package
ML13330A210	List: ML13330A209 ML13330A211
References
2-77B, NUDOCS 8102180639
Download: ML13330A211 (9)

Text

.~ M~

&~ M PO < #277B8 PROJECT 277-18 TNSULATICN SYSTEM EVALUATION - 9600 V. -

SAFETY CLASS 1E FOR SERVICE TO 1 X 10 RADS RANDOM WOND MOTORETTE OBJECT.

To obtain thermal aging and radiation resistance test data on motorettes per prescribed procedures Lo, qualify an insulation system for Safety Class

.E Service.

RERENCE IEEE Std. 334-197 E Standard for Type Test of Continuous DUty Class 1E Motors for Nuclear Pover Generating Stations.

Paragraph 5.1.1 Thermal Endurance, Paragraph 5.1.2 Radiation Endurance DISCUSSION.

A.

The thermal qualification of the insulation system to be obtained by the motorette-procedure as outlined in IEE Std. 117-1974 "IE Standard Test Procedure-for Evaluation of Systems of Insulating Materials for Random-Wound AC Electric Machinery."

.B. The radiation level qualitcation of the insulation system to be obtained on motorettes by passing a one minute, AC high potential test of two thirds of the sum of twice rated voltage plus 1000 volts after simu taneous exposure to gamma radiation total dosage of 1.1 x 10 Rads and a temperature of 170*C (338F) (1)

Note:

Park 5.1.2 of IE 33 states that the temperature during radiation shall be the maximum temperaure found when the motorette temperture-life curve Is extrapolated to the installed life.of the motor (350, 400 hours0.00463 days <br />0.111 hours <br />6.613757e-4 weeks <br />1.522e-4 months <br />).

As the temperature-life curve of this system will not be known until motorette thermal aging (Part A) has been completed it is proposed to run this test at 1700C to stay above expected final temperature, See plot in Attachment #

CONCLUSIONS A.

Thermal Azing of Motorettes As no failures have occurred at the accelerated aging tem peratures to date, calculation of insulation system life line y prescribed methods is not possible.

However, based on the "ten degree rule" and using actual test hours at each test temperature, the insulation system temperature index at forty yeare life ranges from 176.80C to 207.7.

miostsoM/.

Page 42 The =otorette testing is continuing.

B. Radiation Exrosure -of M~ctorette~s Thirty (30) rnot-rettes were GA12~oa~

xv, to a total gamma radiation of 2.1 x )P*rads and te tu aE foll1ows:

Z.

0o46 x 16rads at 1706C I2.

29 X 106 red's at 140 -

'170C

2.

2x16 adsat 261,C After above exp'osure all mctorettes ;assed E hig potential test DO& 14~70 velts AC for 1 minu.',e

'23 F

')000) which would qualify the insulation system for

+e to 1 X IZ radis total dozage.

A.Therm& Ou al_4f c at ior.

1. Gen~eral

..&Iih aging tests were conducted usinE "tre mot o rete tethed to provide system eval1 ation. r~

otn follocwed predesc-ribad peri.ode c f heat ri~. vbr a4&Oni..

h*umidity, and dielectx~ic test based on =L Std.

1. 21 7

174.

2.

-s-t S!-,_ecimenz MZtoreT-as were +/-nsulatled Per L. A..spec,

.tl on PL90.

3. s et Procedure

a. Termperatu re expos-ure (fIor Class e0')

Mtrees were oven heated each cyc' e per th

'A~o~n 1:.empersture-time exposuresi:

270c for I day 230, for 16 diye 220* for 32 dayt

b. Mechanical Stress Exposure:

Following each temperature exposure and after cooling to room te!mperalura motoretteB were Placed on e shake table and vibrated tor one hour at 60 Sz. with E double ampltude of 8 Mfi~a (P to p)+

160 Moli

.Ure Exposure:

• After each mechanIcaCI stress exposure. motorettes were eXP0sed for 48 hourf t.o an. at=,sph-ere of IOC'%

reLative h~idA+/-t-y with visible Condeneation on the

d. Dielectric Chec Test:

Atetme end the mosture exposure period and while the lMtorettes are still. wets a 10 minute voltage proof test was made turn to turn, phase to phase, and each coil winding to ground in sequence Test end point criteria is failure to pass

.20 volts between turns and 600 volts phase to phase and coi winding to ground.

4.

Test Results (to date)

a. Summary of motorette data:

TZ ST T9ST HEAT MOTORETTE TMFFAUE TM.AGING HOURS FAILURES IDX 270 4

66 250 10688 0

1 3016176 020 220 17544 176.8 Temperltrure Index from test hours extrapolated to 40 Year life using 2.00C rule*

b. Motorette aging data sheets shown in Attachment #2.

c. Plot of test data in Attachment #3.

Radiation ualificat'ioh.

1.

neral Radiation endurance made on motorettes to provide system evaluaton.

Radiation exposure and qualification testing foLlowed the pro#ed37 e as described in Paragraph

.1.2 of 1EM #334..974-AST'M fl2953-.-i used as reference for classification of system insulating materials.

2.

Test Specimens Thirty (30) motorettes were Insulated per L.A. speci ficatio P4--01.

3.

Test Procedure (Radiation exposure by capable radiation fac+/-2.ity)____

a.

Tpe of radiation - gamma (From Note 1 of Paragraph 5TI 2 of l=

0334-1974 -

T.khe volume occupied by the sample shall receive an isotropic flux of eamma radiation such that if the vole cflutne ar the specified radiation dose would result.)

(from Paragraph 6.3.

of I

1. 323-197 a

greater total dose than the service lifetime dose should be applied).

c.

Exposure rate -

10 to 107 Rads/hour in air (from IE

1. 278-1967).

d. Exposure temperature -

1700C.

e. Post exposure dielectric test - a high potential test of two-thirds of the sum of twice rated voltage plus 1000 volts, alternating current, for 1 minute 1,467 volts.

4.

Test Results

a. Summary of radiation and temperature exposure data (See Attachment #4 for report.):

RADIATION EXPOSUE P.LATE HOURS 1L cc 104 RADS 106 RADS/HOUR TYPE 2135 170 1o46 0.49 GAou 59 140-170 29 51 26 25 2245 1100

b. Post radiation dielectric withstand test (See Attachment

1. S for teat data sheets.):

a&t Each coil to ground -

1470 volts AC for I minute all (30) motorettes passed, bb. Coil to coil - 1470 Volts AC for 1 minute - all (30) motorettes passed.

cc.

Turn to turn, each coil -

270 Volts AC for 1 minute all (30) motorettes (or 60 coils) passed.

c.

Post radiation dielectric withstand test of sleeved cable to top coil.of motorette (See Attachment #6 for teat data sheet):

.Sleeved cable to top coil -

1470 volts AC for 1 minute

- all 30 samples passed.

i

.~-

-I+

-X 4 :

4:1L

-73

[-I

- -f-.1 s-A5

.-- L----!IPER-TURE, C t,--~

4 2

1...I Is

w 00

• f T

I~~i T

L.

T 4F F

I L)1 0

1?

n

.6 eC 2.a

.0

-~25 30 350.-

TE'----IA URE

L L I.- jUa

1. L L '-

427 E Slewdll Si, PO. Box 2020. Milwaukee, WI 53201 414 461-bUUO Twx

.,62 3115S Litton June 13, 1980 Southern California Edison General Office No. 3 Apparatus Engineering Section P.O. Box 800 Rosemead, California 91770 Attention: Mr. Jack Cohon

SUBJECT:

Southern California Edison Purchase Order G8203651, Louis Allis Serial Number 7-117636 To confirm our telephone conversation of this morning, the motors on the above subject purchase order are indeed wound with an insulation system per our P4-9061, with the possible exception of lead cable. At the time your motors were manufactured, we had two choices for lead cable, one being Mica-Temp, the second being Nomex.

If you can send is a small sample of lead cable from your existing motors, we can analyze it to determine which cable you actually have.

Yours truly, Bonifas

/As stant Product Manager NN

& Special Products bk cc:

Mr. G. L. Calvert, Louis Allis, Milwaukee

LOUIS ALLIS 42 E. Stewari Si. P.O Bo, 2020 M *jkee Wi 5320!

414 481-6000 THw 9 0262 3115 Liton June 26, 1980 Southern California Edison Co.

General Office #3 Apparatus Engineering Section P.O. Box 800 Rosemead, California 91770 Attn: Mr. Jack Cohon Dear Mr. Cohon

Subject:

Southern California purchase order #G8203651, Louis Allis s.n. 7-117636 We have analyzed the sample of motor lead wire sent along with your June 19, 1980 and have determined that it is indeed NOMEX. As such we can certify that the motors on the above s.n. are insulated per P49061 and our test report #277B is applicable.

Sincerely,

.B ifas ss stant Product Manager N

& Special Products

Jurne 19, 19s Mr. J. M. Bonifas Asst. Product :anager NEMA & Special Products Louis AllIs Di"viion -

Litton 427 Z. Stet.art Street P. 0. Lcx 2020

4lwaukee, WI 53201

Subject:

Southern California Purchase Order 0620C65l Louis Allis Serial :;o.

7-117636 Thank.you for your letter of June 13, 1980 identifying your insulation system P4-9061 as applicable to our motor and to your test report #2773.

I am enclosing a small sample of the motor lead.

Would you please identify it so that we may determine if your test data on P4-9061 applies?

If it is other than the nomex wire tested with the P4-9061 system, please identify it.

Any information on its radiation resistance and aging characteristics.would be appreciated. If no test data is available, we need to identify the wire manufacturer to either obtain his test information or a wire sample for a qualification test.

Your early response to this request will be appreciated.

Yours tru J. L. Cohon Senior Engineer enclosure JLC:ned cc:

P. Q. Nelson D. MartLn AES Files