ML20094N405

Staff Exhibit S-41,consisting of Rept Concerning Analysis of Heat Aging Data on 52 Moulding Matl to Determine pre-aging Conditions for Nuclear Qualification Testing

ML20094N405
Person / Time
Site:	Farley
Issue date:	02/19/1992
From:	Albertalli F, Mcgowan E, Scott R RAYCHEM CORP.
To:
References
CIVP-S-041, CIVP-S-41, NUDOCS 9204060337
Download: ML20094N405 (13)

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4 EDR-iO4C 10/15/5'.

CONTINTS Page Section Title 1

1. OBJECTIVE 1

2.

SUMMARY

1

3. CONCLUSIONS 2

4 INTRODUCTION 2

5. REQUIREMENTS

6. TEST PROCEDURE .

1 3

6.1 Specimen Preparation 3

6.2 Oven Aging 4

7. ARRHENIUS PLOTTING 5

8. OETERMINATION OF ACCELERATED AGING CONDITIONS '

9. TABLES AND GRAPHS ,

TABLE 1, Oven Aging Data .

,6 for -52 Moleing Material TABLE 2, . Time-Temperature 6 Relationship of -52 Molcing Material using 30 Percent Retention of Elongation TAELE 3, Aging Times anc - 6' Temperatures Needec to Satisfy a 40 Year Life at 90*C Requirement _

7 FIGURE 1, Oven Aging Data of -52 Molatng Material FIGURE 2, Arrnenius plot of -52 Molding Material 5

10. REFERENCE 5 g 9 APPENDIX A e 10 11.

1 ii l

- - - _ _ _ _ _ _ _ _ _ _ ____1_______

4 ED R - i c.'. .

1C/15/S.

1. OBJECTIVE _

The objective of tnis recort is to prtsent and analyze the Ar*henius Osta i obtained in a heat aging study of -52 molding material to determine pre-aging conditignp for Qualifying parts mace from sne materia'. to IEEE St ancard 383-1974(11 and IEEE Standard 323-1974.(2)

2. SUMM:EY d

recuires components to be pre-aged to a condition ecu va'en:

IEEE 353-1974 to the design life of the nuclear generating station before exposure to a simulated design basis event (DBE). Tnis report describes these re; # e-meets, outlines the nett aging test procedure, presents and analyzes tne results using Arrnenius plots and discusses end-point criterion to cetem,ine tne time-te.oerature relationsnio for this pre-aging. ,

3. CONCLUSIONS A time-tem;erature lationsnip, based on Arrnenius pict:ing, has t&

est a:11sne for -52 molding material wnien satisfies in? recuirements earts of IEEE 383-1974 for establisning the qualified service life of moice: i and for accelerated pre-aging of materials before exposure to ra:1st en and DBE tests.

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EDR 5 ::

20./;5 / 5; 4.. INTRODUglCN An kne*4ive study on the aging characteristics of the 52 molding material used for molded parts for nuclear applications has been cor:w:te:,

This report co:vments the times recuirec for the ultimate elongatier cf to te- e-a.

t this m6terial to decrease wnen die cut soe:imens were expose:

tures between 13PC and 175'C. The values are given in per:ent retentien of tne original value and cover the range of 70 per:ent to 30 per:ent.

These data have been analyzed using 4 30 percent retention of elongation as the ene point. The resulting Arrhenius plot, when adjusted to an ene of life of 40 years at 90*C, yieles a series of times at various te .:e a-tures for pre-agieg the material.

5. REQUIRE *ENTS

. The recuirements for ele:tric caoles and related materials sucn as so' ice insviating parts for nu: lear power plants a*e given in IEEE 383-19' .

This cocument states tnat ' type tests for cesign basis event concitions snould consist :,f subjecting nonagec and aged cables, fiele splices, an:

i connections to a secuence of environmental extremes wnien simulate the j

most severe costulatec conditions of a design basis event anc s:e:1fie:

concitions of installation."

1. int aging re uirement is furthee exclained in anothee section of IEEE r 353-1974 wnsen states, "The basis for estaolishing time anc trce-sta.e concitions for aging of sam:les to simulate their qualif tec life may oe that of Arrnenius plotting or other method of proven valicity and 4;;11ca-bility for the materials in questier."

It is generally specified that the design life of a nuclear gent ating station is 40 years and tnat the majority 4,f the cables usec in the slant .

are rated for a 90'C conductor temperatre. Actual concuctor operating temperatures typically will 1,e 1c <er than 90*C in use due to lowec the

" maximum design" ambient teceratures and CPble derating practices'. H Also molcee parts are typically not in contact witt. the actual concs: tor C*

It is conservative to asses: the aging performance of tne -!2 la itself.

The cables an: M molair.g material at the rated conductor temperature. C splice systes must, therefore, be aged to the equivalent of 40 years C life at 90*C before being subjec*.ed to the radiation anc design basis event reevicec by the standards. Since unaged systems must aise be testec to the same radiation and design basis event conditions, a ca:1e ce system passing the tests in botn tne aged anc unagec con:ition moul:

qualifiec for the design life of tne plant.

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).0/15/31 Groups of five specimens were periodically reeved fr The retention of elongation was calculated and the values plo shown in Figure 1. This infortnation is given in retention of. elongation could be found.

Tacle 1.

A list of 43t4 accuisitior eouipment and calibestion information is givea in Aopendix A.

l

7. ARb!NIU$ pl0NING f l l

a selected end point at several te?peratures a*e I

When the times to reach plottec on a graph witn tne logarithm of time as the ordinate and tne reciprocal of tne absolute temperature as the abscissa, it is saic to ed an Arrhenius p1.11. The IEEE standards do not state wnien end point j Therefore, it becomes important to enoese one that should be selected. There are many possibl,e parreters is consistent wi.th the applicatinn.to select end point criteria, sucn as retention o

• which can 'be use:

elungation, retention 8 tensile strengtn, retention of.dielectri'c It* is staengin, and voltage witnstand tests af ter a mandre' ben tne original properties but on a specific value of elongation or dielectric st engin after aging.

Fe- the work described in this report, a retention The reason for ttJ!,ofenoice 30 perceu was thatof tne tnis a

original elongation was chosen.ene point left a wide margin of safety anc was material study. Since tne ultimate elongation of sne -52 material Jn tne unaged state is *.ypically over 500 percent, a retention of 30 percent of tne original value would still give an ultimate elongation value of over 150 percent. This is well in excess of the count of elongation Some wire insulation in gene *al use needed for any functional purpose.

nas less than this amount of elongation initially or as manuf acturec.

For clarification, the results presented in Table 1 for 30 percent retention of elongation are given in Tacle 2. Using these results an Arrnenius plot has been drawn and is shown in Figure 2.

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8. DETE8PINATION OF ACCELERATED AGING CONDITIONS

- An extrapolation of the data based on linear regression analysis indicates 7

that the material will retain 30 percent of its initial elongation after

• 40 years at 103*C, a temperature 13*C above its reovired ratto temoe atre.

Therefore, to cetermine appropriate acceleratac aging conditions for tne purpose of p e-aging specimtns for DBE tests, a line may*be ceswn wn*:n passes tnrougn the point corrasponding to 40 years at 90 C and is paratie'.

Such a line is snown (i.e., sme heat of activazion) to the life curve.

' as Curve 8 of Figure 2. Now, any point along Cu ve 5 represents a time tecerature combination that may be used to. pre-age A few suce sper.imens 9;ncitions to are simulate ene of life concitions for D8E tests.It can be seen that en aging time given in Taole 3.150*C is a practical and valid set of conditions for acceleratec based on a design life of 40 years at 90*C. '

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, EDR-5040 10/15/51

9. _ TABLES AND GRAPHS ,

TABLE 1 Ovea !;4rg ?ca For 52 Molding Material -

Oven Temper ature Time (h) to Various

('C) Leveis of Retainec Elongation 70% 60% 50% 40% 30%

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2675 11600 3225 150 510 1200 162 160 525 1000 1225 1350 175 40 160 260 350 450 TABLE 2 Time-Temperature Relationsnip.of 52 Moicing Material Using 30 Percent Retention of Elongation Temeer at ure Time

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'175 450 162 1350 150 3225 136 11600 TABLE 3 Aging Times anc Temperatures Needec To satisfy a A0 Year Life at 90*C Requirement Temeerature Time .

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ECR 500 10/15/51

10. REFEtfyCES 383-1974, "IEEE Standard for Type Test of Class (1) 1EEE Standard

' Electric Catics Field Splices, and Connections far Nuclear Powee Generation Stations." .

(2) 1EEE Stancard 323-1974, "!EEE Standar for Qualifyin; IE E wipment for Nu: lear Power Generating Stat sns."

(3) Rayche Laboratory Notebook 3980 307, 313, 314, 322

- Ray:nm Physical Test LaDor atory Notecooks i

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APPEND!'1 A

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1 j LIST OF DAT A AC00151T10N EQUIPMENT

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MODEL NO. RAN*,!

d WG 5

_ERIAL-NO.

1N5tRU*ENT Honeyttil DB210735001 16303846/324- 0 300'C j Temperature Recorcer 162 i

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Instron (Calibration Instron --- -

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! Lee Corp. -.--- 7055 0 500*F j Indicating Pyrometer J

The instruments listec aoove we e calibrated against stancards. traceable i to the National Bureau of Stancards or an acceptable natural physical j stancare per MIL-1-45208A and MIL-C-45052A ,equirements.

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