ML20154G050
| ML20154G050 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 11/15/1984 |
| From: | Depson K, Jerome Murphy SCHNEIDER CONSULTING ENGINEERS |
| To: | |
| Shared Package | |
| ML20154G027 | List: |
| References | |
| SCE-ANO-06, SCE-ANO-6, NUDOCS 8809200230 | |
| Download: ML20154G050 (40) | |
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j Schneider 111 PresidentJat arvd. Telephone Consulting Engineers Baia Cynwyd (215) 664 2338
., Pennsylvania 19004 sf}p y D CUi.iERIin c .
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'E Analysis Report
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E.Q. DOCijMENTAT1014
^f g, yo* atsee Q ge SCE-ANO-06 9 ihm No.
Y ........-1 F ptyttWED DY g Aging Evaluation of v o _ f 11 *l'1 i
'7 Electrical Cables c
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O November 15, 1984 a 9(0 hc '
.IA ManPH Y he<Nt u8,24M L Prepared by V16 viewed by
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0809200230 88081933 , PDR ADOCK 05
,' . s i .. TABLE OF CONTENTS Section- Page Description _ 1 Purpose 1 2 Materials Used for the Insulations of 1 07 # Cables Installed in the Containments p, of ANO Units 1 and 2
*> .3 AgingofEthylenePropyleneRubber(EPDM) 1 Cable Insulation Mr 3s 4 Aging of Chlorosulfonated Polyethylene 2 (Hypalen)
O 5 Cross-Linked Polyolefin Cable and Splices 3 U7 (Raychem Flamtrol and Thermofit WCSF-N) 6 Aging of Cables Installed in ANO 4 7 References 12 o Appendix A Appendix B 9
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- 1. Purpose The purpose of this report is to describe the processes involved in the aging of electrical cable insulations used in At10 units 1 and 2 and to describe a method for evaluating the extent of age-related degradation occurring in the insulation of the installed cables.
O* g.2. Materials Used for the Insulations of Cables Installed in the Containments of
% A!40 Units 1 and 2 Y
- a. Ethylene Propylene Rubber (EPNi) supplied by Anaconda, Okonite and Eaton (formerlySamuelMoore).
O
'o b. Chlorosulfonated Polyethylene (Hypalon) supplied by Boston Insulated 7
9 Wire (BOSTRA0 ). o
- c. Cross-Linked Polyolefin supplied by Raychem Corporation, o
o . In addition, the high range radiation monitors.use Rockbestos (RSS-6-104) coaxial cable.
- 3. Aging of Ethylene Propylene Rubber (EPDM) Cable Insulation In chemical tems the material is a terpolymer of ethylene, propylene and non-conjugated diene. This basic material is compounded with coloring agents and flame inhibitors. The compound is extruded over a copper conductor s
and then vulcanized to form the finished insulated wire. The primary mode of degradation of EPDM at the temperatures encountered during plant operation is oxidation. Dupont (the developer of EPDM under the trade mark Nordel), as well as other cable manufacturers, have run extensive accele-rated and natural aging tests on the material with the following ge'neral results. Property Behavior Tensile Strength Increases slightly with age Elongation Decreases with age Shore A Hardness Increases with age Dielectric Strength Increases with age Insulation Resistance increases with age i Flexibility Retention No change to slight decrease 1
- o. ; ,
- 3. Aging of Ethylene Propylene Rubber (EPDM) Cable Insulation _ (cont'd)
In general, the property of a hydrocarbon-based elastomer (of which EPDM is one) used as wire insulation which shows the most change as a result of oxidation resulting from aging is the elongation. As a result, elongation changes are commonly used by ICEA and cable manufacturers to measure age-e < .related degradation. A conservative limit of 40% retention of initial r elongation is accepted as the standard for accelerated aging tests, w Figure 3-1 shows accelerated aging test data for typical EPDM cable 0 0 insulations. The longest test duration was 5,300 hours at 120 C (248 F). Figure 3-2 shows the results of natural aging conducted by Dupont for a O 0 period of 10 years (87,600 hours) at 120 F and 80% relative humidity.
'n N No useable data on dielectric properties as a function ihe age of ry the cable insulation has been found.
O
- 4. Aging of Chlorosulfonated Polyethylene (Hypalon)
- Chlorosulfonated Polyethylene (Hypalon) cable insulation is only used at ANO on Boston Insulated Wire Company (BlW) cables under the trade name 7
BOSTRA0 . Hypalon is commonly used as a cable jacket material b/ several l manufacturers. The chlorine provides flame resistance and oil resistance for the cable insulation and jacket. The primary mode of degradation of Hypalon insulation is oxidation at w the temperatures to which the cables are subjected in the ANO plant. At temperatures above 250 C outgassing of Hydrochloric Acid (HCL) is the predominant mode of degradation. BIW has perfomed extensive accelerated aging tests on 7 their Hypalon insulation (505TRA0 ) with the following results. Property Behavior Tensile Strength Erratic Elongation Decreases Dielectric Strength Negligible change ! Insulation Resistance Increases l Power Factor (TANA ) Increases
- 2 l
t
- 4. Aging of Chlorosulfonated Polyethylene (Hypalon) (cont'd) l As is the case for other cable insulations, the property of Hypalon, l which shows the most consistent results for age-related degradation is the l elongation. BIW uses a 50% retention of original elon ation as the basis for developing life vs. temperature curves for BOSTRAD (Hypalon). Figure 4-1 7
shows the life / temperature relationship for BOSTRAD . The data predicts a ! 40 year life at 150 0F, EPRI NP-1558 on page 7-24 indicates that Hypalon showed 0 0 nodeg'radationafter5yearsat70F(210). [ M , T No useable data on the effect of aging on the electrical properties of N BOSTRAD7 (Hypalon) have been located, t o a 5. Cross-1. inked Polyolefin Cable and Splices (Raychem Flamtrol and Thermofit WCSF-N) I q g The Raychem Flamtrol cable insulation, is a radiation cross-linked f polyolefin material. The manufacturing process uses polyolefin chips, coloring ! O i agents, and oxidents and flame retardants which are compounded and hot extruded : over the copper conductor. The ins'ulated wire is subjected to radiation by I electrons from linear accelerators to accomplish the cross-linking. .
'i i
There are 2 modes of degradation of cross-liaked polyolefin insulation. [ both of which occur simultaneously; they are:
- 1. Oxidation
- 2. Continuing molecular polymerization s[
Extensive accelerated aging tests have been conducted both by Rockbestos { and by Raychem on cross-linked Polyolefin insulation. (Raychem developed the insulation material in the early 1970's. The process, including the manufacturing
'equipmentwassoldtoRockbestosin1976). The results of the aging tests I indicate the following property behavior.
Property Behavior j Tensile Strength Increases [ , Elon ation Decreases [ t Insu ation Resistance Increases Dielectris Strength Increases. I i i 0 I / i 1 _ _ _ _ _
- e. ,
- 5. Cross-Linked Polyolefin Cable and Solices (Raychem Flamtrol and Thermofit WCSF-N) (cont'd) .
The property which shows the most consistent results in accelerated aging tests is the retention of elongation. The criterion for satisfactory perfomance selected for the testing was 60% retention of initial elongation. Figure 5-1 N- shows the results of thermal aging tests on cross-linked polyolifin insulation. r The data available on electrical proparty changes associated with the accelerated aging tests indicates changes in insulation resistance from 13 I4 1.5 x 10 ohms to 1 x 10 ohms. On most megohmeters such differences are within the accuracy of the instrumentation and cannot be considered as useable 7 data, m 9 The same type of accelerated themal aging tests were conducted on the
, Raychem WCSF-N cross-linked Polyolefin heat shrinkable splices. All of the testing indicated slightly better retention of properties than the cross-linked a
polyolefin cable insulation.
- 6. Aging of Cables Installed in ANO
- a. Mechanism - The insulation on the cable', installed in ANO units I and 2 is primarily subject to age-related degradation caused by temperature.
While there is some effect caused by radiation inside contaiment, the 6 40 year integrated dose is less than 10 rads and the effects are not measurable. Qualification testing of the ANO cable insulators and splice w sleeves have been performed in sequences based on: e Thermal aging followed by radiation e Radiation followed by thermal aging To evaluate possible synergisms. No differences were found in the performance of the cable insulations installed in ANO units 1 and 2 and described in this report. 4 i
- e. ,
- 6. Aging of Cables Insqr.11ed in ANO (cont'd)
The temperature induced aging degradation is the result of the combination of 2 ambient temperature and the temperature rise resulting from any 1 R losses in the conductors. For instrumentation and control cables, the currents are so low that heating due to 1 2R losses is negligible and any age related n- degradation is caused by the ambient temperature. For safety-related g power cables, the current loadings are less than half of the ampacity , ratings of the conductors resulting in a temperature rise of 25'C. (Although EPRI NP-1558, Section 7.1.3.3 indicates that the heating caused Y by current loading has a negligible effect on insulation life, the effects N are considered in this evaluation because the duration of the tests was less O than 20 days. It is considered that longer current loading times would to eventually cause degradation similar to what would occur in an aging oven.
, In the aging oven, the air is circulated over the outside surface 1
)
n insulation causing a rapid initial oxygen diffusion which saturates after a short time at any specific temperature. Eventually, th6 same degree of oxidation will occur as a result of heating from the conductor. It just takes longer because the outside surface of the insulation is at a lower temperature than the insulation closer to.the copper conductor). If it is assumed that the insulation temperature of I&C circuits is at the 0 0 maximum ambient temperature of 120 F (48.8 C) and that the insulation tem-0 0 0 perature of power cables is at 48.8 C + 25 C = 73.8 C (165 F), it is concluded that some change in elongation will occur over the life of the plant. s While an exact value cannot be predicted with any accuracy, the accelerated aging data for the materials indicates that the cables installed in ANO will retain between 60% and 80% of their original elongations.
- h. e. valuation of Ace-Related Deoradation of the Cables Installed in ANO The amount of age-related degradation occurring in the cables installed in ANO units 1 and 2 can be detemined by tests conducted on short sections cut from the end of spare cables installed inside containment.
The requirements are as follows: 5
M** 4 e *
- b. Evaluation of Age-RelaBed Degradation of the Cables Installed in ANO (cont'd) '
a
! e Size of sample. . ... 8 ' inches. .
f e Type of sample..... 1 sample of each material.
< e Sample frequency... First_ set of samples 15 years af ter initial i operation; second_ set of samples 25 years i after initial operation; third set of samples l
- v. 33 years after initial operation; fourth _ set of ;
M samples 40 years after initial operation. D e The spare cables selected should have at least 2 conductors. . Y e The spare cables selected should be tagged and the same cables i N used for the initial tests should be used for all subsequent tests. j O e The vendor certified data for the spare cables selected for test ;
' should be checked and the original tensile strength and elongation i g : ' at break should be recorded. i ! e One end of each of the cables to be tested should be untaped and an i i O 8 inch long piece cut off. The remaining cable end should be i j
retaped. a ' J o e The cable jacket of each sample should be carefully split and ; I stripped to avoid damaging tie conductor insulation. . l r
! -- o The insulated conductors from each cable should be tagged with the
- information necessary to identify them with the spare esbie from which the sarple was cut. ,
, )
a The following steps may be performed by AP&L or by a qualified test ! j I taboratory. The equipment needed to perform the testing is: l I '
- a. Special tools to sitt and strip the insulation from the conduc'. ors.
l ! (Most cable manufacturers have this equipment in their test labs). l
- b. An Instron tester calibrated to NBS standards. ,
)
t The testing steps are: > j e The insulation should be slit and stripped from each conductor. [ The tags affixed by AP&L to the conductors should be kept with ; j the proper insulation specimens. l t 1 !
- ' e Each 8 inch specimen should be tested on a calibrated Instron tester.
The tensile strength and elongation at break of each specimen should f i be recorded together with the sample identification from the AP&L i t49 I . i i i 6 f i . . ..-..-
r ., .
- b. Evaluation of Age-Related Degradation of the Cables Installed in ANO (cont'd)
To evaluate the data AP&L should:
- a. Determine the arithmetric average fnr clongation for the number of test samples for each cable sample.
- b. The arithmetic average of the elongations for each cable should M. be divided by the original elongation data from the vendor
,- certification. The resulting number should be multiplied by 100 to determine the % retention of elongation.
9 T It is expected that the data should be in the following N ranges: o
,p -
Time % Retention Elencation
't 15 years 65% to 90t 25 years 60% to 85%
O .t3 years 50% to 80% 40 years 40% to 75% a o Should any of the averaged initial (15 years af ter operation) - - - - - - - - samples show values lower than 65% retention of elongation. Subsequent samples from that cable should be taken at 5 year intervals. If the retained elongation goes below 30% at any time during life, all of the cables represented by the samples should be replaced within the 5 year period following the test.
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'7. References Okonitz Report G-3 1.
September 7, 1977.
- 2. Anaconda-Continental Report No. 79118.
- 3. Boston Insulated Wire Report B-901.
- 4. Boston Insulated Wire Report B-902.
'T 5. Franklin Institute Research Laboratory Re.".9rts F-C4033-1, p3 F-C4033-2, F-C4033-3. .
Mr 6. Rockbestos Report QR#1806, 1981.
** 7. Dupont Report, Nordel Engineering properties and applications.
O in st. O O C) , I f l
/ 12
,-..--L ,
r, i. -
.. ~, ..
g .- w
., Appendix A v
N
- Precautions Regarding g
ra Cable Insulations s o O ANO Units 1 and 2 l t i 0 4 1 / I l
4 . .. ,
- 1. Purpose The purpsoe of this aopendix is to identify certain adverse environmental -
conditions which could result in damage to the cable insulation. Such damage could drastically shorten the cable life and compromise LOCA performance.
,2. Ethylene Propylene Rubber (EPDM)
- Certain organic liquids will cause rapid deterioration of EPDM. To ensure M the validity of the aging evaluation and the qualification test results, it is V necessary to ensure that the following materials do not come into contact with N the cable insulation.
- O g e Lubricating oils e Carbon tetrachloride si e Benzene e Cyclohexane o e 0-Dichlorobenzene g e N-Hexane The above materials will virtually destroy the mechanical and electrical.
0
. properties of EPDM in less than 28 days at 75 F.
- 3. Chlorosulfonated Polyethylene (Hypalon)
The mechanical and electrical properties of Hypalon, as well as its radiation resistance, are adversely affected by long term contact with aromatic or chlorinated hydrocarbon solvents. Typical among solvents that damage Hypalon s are: , o Benzene l e Carbon tetrachloride ' e Trichloro-ethylene e Perchloro-ethylene ' i e 0-Di-chlorobenzene e Methyl-ethyl Xetone i i
; A-1
/
t .. .
p
- 3. Chlorosulfonated Polyethylene (Hypalon) (cont'd)
The rate of attack of the various aromatic and chlorinated hydrocarbons - depends on the specific organic solvent. In general, contact with Hypalon [. by such solvents should be avoided.
- 4. Cross-Linked Polyolefin (Ray;. Tem /Rockbestos) 9 l
'T Cross-linked polyolefin insulations are resistant to most of the common l ro organic solvents.
9r - ss 5. Cleaning of Cable Insulation c3 . If it is necessary to clean cable insulations either distilled, demineral-In ized water or denatured alcohol followed-by distilled / demineralized water
" should be used. Other solvents should only be used if compatability tests
<? have been performed, o
C I i l l l -
) A-2
/
/
r . g g *e ** ** -**
- a y e
1
- s. . l
's ,- . ' . , ,
l 1 1 LO *. v . c.g v Appendix B O
!.n N
O o Effects of Aging a on LOCA Qualification s l 6 h i i
e ,.v. .... ' W l, , In section 6 of this report, a criterion of 30% retention of elongation was identified as the limit for usefulness of the cable insulation materials installed in ANO units 1 and 2. The basis for this criterion is that there is no LOCA test data which would demonstrate qualification of cables having less than 30% retention of elongation. e _1. Cross-Linked Polyolefin y In report F-C4033-1 LOCA tests were performed on cables and splices : which had been pre-aged for a total of 32 days at 150 C. This amount of v pre-aging corresponds to a 30% to 35% retention of original elongation. The cables performed satisfactorily during and after LOCA tests. , o
'9-
- 2. Ethylene Propylene Rubber (EPDM)
M e In Okonite report G-3 LOCA tests were performed on cables that had been 0 pre-aged for 21 days at 150 0. This pre-aging corresponds to a 30% retention a g of original elongation. The cables performed satisfactorily during and after LOCA tests.
- 3. Chlorosulfonated Polyethylene (Hypalon) 7 BIW reports B-901 and B-902 report LOCA testing conducted on BOSTRAD (Hypalon) insulated cables witn varying amounts of pre-aging results in 30%,
35%, 40%, 50% and 60% of original elongs. tion. The cables performed satis-A factorily during and after LOCA tests. . e
) B-1
- ,/. L
l i l ATTACHMENT 1
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Schneider III PresMential elvd. Telephone Consulting Engineers Bata Cynwyd 1215) 664 2338 Pennsylvania 19004
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h I 'l i5 QQk h ( _.- j April 3, 1985
@Rg i ca 3
Mr. Charles Turk E.Q. DOCUMENTATION vsa AW3ps pow QuGHT uect C
)
g, gg W"gg susct5l Licensing Engineer 3 ., y Arkansas Power and Light Company %m Na 4 (7thFloorF.C.B.)
., P.O. Box 551 Little Rock, Arkansas 72203 l*
Subject:
"T" Orains on Limitorque Motorized Valve Actuators O
References:
1. 7 Telecon, J."T"
Subject:
Murphy Drains (SCE), and TomyActuators on Limitorque Le (flRC, (At I&E]a'chment,1) J
- 2. Telecon,K.Iepson(SCE),andJ. Drab (Limitorque).
)
Subject:
"T" Drains on Limitorque Actuators (Attachment 2) 3
Dear Mr. Turk:
Pursuant to my conversation with Jeff Holt (AP&L, Aft 0 Electrical Maintenance Coordinator) and yourself, SCE has investigated the necessity of "T" drains on Limitorque actuators, particularly as they relate to the environmental qualification of thera devices. Discussions with the NRC (Ref. 1) have revealed that the pr, vry concern (noted during an EQ audit at Commonwealth Edison's Zion Station) with the "T" drains is not specifically EQ related. These drains are shipped with the actuators by wiring the part with a tag inside the motor housing A plastic shipping plug protects the installation port. The problem at Zion was that the plugs were never removed and the "T" drains were never installed. In fact, the "T" drains were never removed from the motor housings. SCE reviewed Limitorque maintenance part lists and drawings and. found that the "T" drains are not shown. SCE contacted Limitorque (Ref. 2) and learned that the primary functions of the "T" drain are to allow excess condensate to drain from the motor housing if it collects and to - admit the external atmos:here into the motor housing in order to equalize the pressure across the 1ousing. The design philosophy of adding the drain is identified on page 21 of Limitorque Report B0058 and is only applicable to in-containment actuators.
/\UJ Aft. 6/1. C[0 5 f.h / rt NC. //1th t cit CO/A.
iv f -tos m cTot cke keev j;erwa[CE te - 4I(4 lu v u g+s} h c
Mr. Charles Turk April 3, 1985 Arkansas Power & Light Company SCE also learned the following from Joe Drab (Limitorque): e Limitorque units tested prior to September 1972 had no "T" drain (1/4" pipe plug substituted), but still functioned satisfactorily during Limitorque testing. e Limitorque units tested by Limitorque after September 1972 had
- "T" drains installed and operated satisfactorily.
O Additionally, FIRL and Westinghouse have both conducted tests on N Limitorque Actuators without "T" drains with acceptable results.
- Based on a review of the test results and anomalies which occurred during testing of Limitorque actuators during both time frames, SCE concluded that
. there is no evidence of a difference in performance between actuators using "T" drains and those using pipe plugs. Therefore, it is further concluded 7 that actuators traceable to test reports dated September 1972 or later which %, do not have, qualified an d the test reports are still applicable."T"Thedrains installed, actuators shouldbut do have pip have 3 either a "T" drain or a pipe plug to prevent dirt, etc. 'from entering during normal operation. ' The recent EQ walkdown performed by SCE personnel (as well as an earlier 3 walkdown performed by AP&L) did not detect any plastic shipping plugs or the presence of "T" drains. The walkdown also confirmed that there were no openings into the devices. This included verification that limit switch compartment cover plugs were also installed. SCE recomends the following based on the discussion presented above:
- 1. Limitorque actuators supplied to AP&L and traceable to EQ test reports dated prior to 9-72: No action; devices qualified. _
- 2. Limitorque actuators supplied to AP&L and traceable to EQ test reports dated after 9-72: No action; devices qualified.
- 3. All new actuators supplied for in-containment use: Install the "T" drain in accordance with the shipping / installation instructions.
Verify that the motor housing drain port has the "T" drain installed and the tag is removed,
- a. The EQ maintenance data sheets (Form 1025.06C)) on new actuators may be revised to reflect this check point during any maintenance activity.
Mr. Charles Turk April 3, 1985 Arkansas Power & Light Company
- 4. If an actuator in service is found to have the plastic shipping plug installed, the device should be removed from service, the plastic plug removed and the motor housing inspected for the "T" drain and tag. The tag should be removed and the "Td drain installed.
- 5. Licensing /Enginer. ring should notify ANO Electrical Maintenance /
EQ Coordinator of any specific actions to be taken by ANO as a result '3 of this letter. AP&L licensing / engineering position should be stated
- for documentation purposes. -
s ~y The conclusions and recomendations were made by SCE using some information which is not in AP&L EQ file or Limitorque possession. The information base used envelopes both the AP&L and Limitorque information sources and is, therefore, considered to be the best source from which to T' draw a conclusion. Should you have any coments or questions, please feel free to contact y Mr. Joseph Murphy, Manager - Philadelphia Office or myself. 9 - Thank you. - 3 3 Very truly yours, h4un L. v)N{Ad%. Kevin J. Iepson Principal Engineer XJI/be Attachments cc: Mr. Jeff Holt - AP&L
i Ett'o eom..,. MEMORANDUM - j Telephone Memorandum . l l T0: Files > ' FROM: Kevin p)df p
,'{
~DATE: . : April 1, 1985 '
; -tU? ' -
. . . - ~ . .. . .~,u~_,u. :. a-; . 4,; ,y ,
=
SUNECT: .' Telephone Conversation with Mr. Joseph Drab S ecial . Projects M? dxW; r
~ A
^ [; i,Limitorque Actuators.1 Engineer, Limitorque Corporation. RE: "T" dr ins on ' '
- " e ' 'x -
c.c W '7%: P.if'cycb -
. S r.M O N ..7. . F I y
4 .. ' n . ._ . ,.'
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,. .o y .' . . . . . - ,
Based on discussions with 7 . Charles Turk AP&LLicensing)and' - i r Mr. Jeff Holt (AP&L, ANO Electrit .1 Maintenance)(, the question of whether-M ' i Mi "T" drains were required to be in: 'alled to consider the actuators qualified e ' .' ' was raised. I contacted Limitorqu 2 and learned the following: . ,.s, ,..J:*. n .. L y e EQ testing' prior to September 1972 tested actijators'without "T" drains. " ~
~. .
1 Results were acceptable. Pipe plugs were used instead.of the "T" .. ..' ;'.' c drain. * ' :' ' t" ' s .Ti 4 '
'"" e
- c +f, c ,' <
3 . . .; . 5 .
}
s
'e EQ testing after September 1972 tested actuators with '.'T" drains. . - ;'" -
3 Results were acceptable. '
- '- ' ' i * '
- - E -
e "T" drains are designed to be installed in the motor housing at the
- I lowest point to: 4
. s
- ;! )
~
.'*\- ..
., 'c ~ %'* f ,;
' ' 3- All_ow condensate to drain'ou't '
, ../ '
,4 147 e...
~ Admit the external atmosphere to enter the motor housing thereby '
equalizing the pressure across the housing.
^ ^ ~
H - e The ' design philosophy foru ' sing "T" drains is stated in Limitorque - ,# ' Report B0058, page 21. . e "T" drains are only an issue on in-containment actuators. '
.. . . , ~
l4 is Limitorque supplies "T" drains with all in-containment actuators. .. The_ part is separately wired with a tag inside the motor housing
~
'for shipping. The installation port threads are protected with a. s, . .
plastic cap / plug.
.n
^
'd
'.->W, y
'i.
,n .j. ...
[ . a s. a I told Mr.' Drab that based on the information he rovided and the ! ' ; 'T " ! , 'results of independent tests (FIRL, Westinghouse, etc. during both time frames, J. i it would appear that the "T" drains are inconsequentii with regard to l qualification of the device. Mr. Drab weuld not commit to this statement; he merely stated that this is their current design and that any conclusions concerning the acceptability of other units
- is the user's responsibility.
( l ' Units using pipe plugs instead of "T" drains on actuators traceable to [ reports post September 1972, cc: Charles Turk - AP&L Jeff Hol t -AP5L
- ., a: . - -
t i re='.',ee,i...,. MEMORANDUM _ -- z. = e Telephone Memorandum '
'T0: Files ,
t
'M "
~
I* FR0!I:.7J. A. Mu
'..7.-:
; q::.
V - ,- : <. > af . 9 :, ,. ; , ,DATE:.g.. April},1985 , pc . .- - t.. c
',, .2 :
SUBJECT:
,. Telephone Conversation with Mr. N. B. (Tomy) Le (NRC-I&E)".%Z,?, ~- .: '
;;y $ ..:RE:' "T" Drains on Limitorque Actuators. (301-492-9686) - Wv
,7 J
u.c .;
,y ..' * ~ '
Based on a discussion betwee- K. Iepson (SCE), Mr. Charles Turk (AP&L, I Licensino), and Mr. Jeff Holt (AP&L, ANO Electrical Maintenance) and the -c-
,- relatively vague problem identified, I decided to contact Tomy Le in order; '
to define: . -
~-
f_ -
- ,_[}^ '
i e The exact nature of the problem "
? J ,/
I;l, .. , v. p. .
~
. p. ~ '
. ::r 6 e ' The manner in which the problem was discovered -
is D -
- 4. ; d O' ,
e , ,, 6 "t A. o 3 e Where the problem occurred u.f Y e What was the impact of the problem on the environmental
. qualification of the actuators. ,,
~
. c. - l Tomy provided the following details concerning the'"T" drains on 7- ,
V
~
~Limitorque ac,tuators: *
~
,- 9 1
',[*
During an EQ walkdown as part of the NRC 'I&E EQ audic at Commonwealth
, Edison's Zion Station)(, it was discovered that the plastic shipping caps for the "T" drain installation ports were .still installed even though the device was in service. .
g ( Further investigation found that the "T" drain was still ' wired " inside the motor housing with the installation tag. ., , The NRC had not established a clear impact on qualification of the
' devices. There was a breakdown in the utility /A.E. installation & '
checkout procedures. ~ { ,' , .-~
- c. : r. :- t rs. '. . ', ,
'2 I in'ormed Tomy that testing of actuators with pipe plugs and with ' . ,
r' - -
T" dreins boM had successful / acceptable results and that I '"
consider either arrangement qualified. Tomy and I agreed that the importance of the finding is in the procedural breakdown and not in the adequacy of the device to function. cc: Charles Turk - AP&L Jeff Holt - AP&L
i l ATTACHMENT 2
1 1 fbD [ SYSTEM QUALIFICATION SYSTEM: CONTAINMENT HRRM ID (TAG) NO.sjeEN 1030 COMPONENT CRITERIA: COMPONENT: ELECTRICAL CABLE EVALUATION 10CFR 50.49 UNIT: ANO-1 NO2KSHEET ' Nf6: LOCATION: RB ESP-211F1 EVAL.: ATTACHED DESCRIPTION ENVIRONMENT DOCUMENTATION REFERENCES QUAL. OPEN MANUFACTURER: PARAMETER REQ'D LEVEL QUAL. LEVEL REQUIRED QUALIFICATION METHOD ITEM fREHTOC OPERATING 720 2400 ESMP #71 V42 ITEM 7 SIMULT NONE TIME TEST (HRS) CPRDS CODE: 280 346 FBAR FIGURE V42 ITEM 7 SIMULT NONE MODEL NO.: ' TEMP (F) 14-62 TEST 1/C 622 AWG % CA",LE (NOTE 1 ) PRESSURE 53.1 122 FSAR FIGURE V42 ITEM 7 SIMULT NONE FUNCTION: (PSIG) 14-61 TEST Cl5H RANGE RAD 1 ATION MONITORIN O RELATIVE 100 100 ESMP i 71 V42 ITEM 7 SIMULT NONE CERVICE: HUMIDITY TEST MONITORING % CHEMICAL 2670 PPM 3000 PPM ESMP #71 V42 ITEM 7 SIMULT NONE SPRAY (pH BORON BORON TEST FLOOD LEVEL: AND COMP) pH 10.5 MAX pH 10.5 ABOVE RADIATION 5.0 E+7 2.0 E+8 ESMP #71 V42 ITEM 7 SEQUENT NONE ACCURACY (RADS) TEST REQJ: D]A J RS 40 YEARS FSAR V42 ITEM 7 SEQUE NONE DEMO: AGING MISC EO ITEM 18 _TES & (NOTE 2 N/A g AN .3 N/A N/A N/A N/A N/A NONE SUBMERG. NOTES: 1.FOR FORMULATION RSS-6-113/LE 88-6-113/LD. SE UATT PREPARED BY: "T2- M-dIym 1 TO ESP-211 EVALUATION. 2. REQUI'ER h AN AMBIENT TEM DATE: i 7. / t7 /MB ERATURE OF 160 F. REVIEWED BY: C7h sia (t2 1 6Lt f / DATE: c?U/ a 3 / E9
- SCEW SHEET NO.: A233 REVISION NO.: 3 9 .
! y J
~
J Form 211 F1 Rev. 07-07-86 Page 5 of 14 IV. Qualification Documentation A. Qualification References
- 1. File V42, Item 7, Rockbestos Report #QR-6802 dated March 12, 1986
- 2. File Misc. EQ Item 18, Aging of Electrical Cable Analysis ,
3.g . File V42, Items 198,19C,190 (Similarity of second' B. (6Mh4 -6co2 - l 4 a apply S. d A"
- 87-MME* W x 1. Type Tests
- 2. Experience x 3. Analysis - indicate type and the arameters addressed Aging (see ref. 2 (Sek' fv M Simi.larity of RSS-6-113/LD (second generation) see i R,ef. ~ 3 C. Test Specimen Description
- 1. Device Electrical Cable
- 2. Vendor The Rockbestos Company
- 3. Model #/ID # Cable "E" on page 5-A
- 4. Range / Size / Options, etc. Cable "E" on page 5-A
- 5. Qualified Interfaces None
r Form 211 F1 Rev. 07-07-86 Page 1 of 14 ARKANSAS NUCLEAR ONE UNITS 1 AND 2 EQUIPMENT ENVIRONMENTAL QUALIFICATION DOCUMENTATION EVALUATION FORM DCP No. I. EOUIPMENT DESCRIPTION
- A. Device Electrical Cable
- 8. Tag # GEN-1030 C. SCEW sheet A233
- 0. System /P&ID E. Safety Function Transmit signals from safety-related equipment F. Service High Range Radiation Monitor G. Vendor The Rockbestos Company H. Model #/ID # Mfr. Product Code H44-3024 ,
i
!. Range / Size / Options, etc. 1/C #22 Awg. Coaxial Cable b J. Spes&fication Ms.K.R55:6-113/LE (Thjrd Gen.) and A55-6-113/LD (seetmf gen'.') by sf aflarity ;
r K. Purchase Order No/Date 11406-E-2405-AC/0ec. 1980
~
General Atomics P.O. 777242/ 8/11/81 . f
. F i
Form 211 F1 Rev. 07-07-86 Page 9 of 14 V. Qualification Assessment A. Is the installed equipment (or that being considered for installation) identical to the tested equipment? Yes x No (justify any difference by similarity analysis, etc.)
/ h3 See Attachment 1 and items included as reference 3.
B. Were any test failures or anomalios encountered during the test program? x Yes (list below and justify each) No Failure / Anomaly Resolution Occasional loss of Test extended to 108 days proper temperature /pressJre to compensate for "down" caused by boiler failure time 8
-w
Ferm 211 F1 Rov. 07-07-86 Page 12 of 14 V. Qualification Assessment (Continued) H. Was the test sequence properly chosen? x Yes No (justify) I. Were the operational modes tested representative of expected plant operational modes (e.g. , were normally energized solenoids energized during test)? x Yes i No (jostify) J. Were the functional testing considerations appropriate that is, was device performance properly monitored during the testing (pre-test, test and post-test)? x Yes (explain) No (justify differences) i y For the /LE (third generation) cables, the cables were energized c.__. ' and monitored throughout the LOCA test. IR measurements were made periodically throughout entire test program. Based upon the
' analysis documented in V12-198, C, 0, the /LO (second generation) cable prio.ory insulation material is identical to the /LE primary insulation and the two cables should therefore perform similarly during and after a DBE. ;
K. Were the applicable IE notices considered in the evaluation? x Yes (explain) N/A (explain) 4
l
. l
, TTAcHHavr .A.
n3 \ 89GEEESI93_G96M6L_96 ELE __BSE:6 .ts EB929G L G90E_ Bod:_0;te S o " This cable has been manu ctured using three different formulations; namely, RSS-6 (first g /.to @ S/40 1C O (second generation), and RS3-6-!_ypggation), RSS -c(third generation). ANO inventory (Rockbestos Reel No. G-11924, Shop Order No. 52102-96) has the first generation, while the - General Atomics High Range Radiation Monitor (HRRM) installed inside the Reactor Building is attached to a #" D Rockbestos cable made w'ith the second generation formulation ** ('/LD'). c,*yMd According to Rockbestos (letter to Schneider Consulting Engineers dated June 19, 1986 from George G. Littlehales, Manager, Guality Assurance) the first generation formulation is "not qualified for operation above 230 degrees F.' (See Rockbestos Technical Report TS-1981-YSK-3). It was originally qualified under Rockbestos report ' Qualification of Firewall III Coaxial Constructions' dated March 15, 1979. The HRRM originally had cable made with the first generation formulation, but it was changed by General Atomics and now has a cable using the '/LD' formulation. This formulation was qualified by Rockbestos in_a test program that was the subject of an NRC review, and is of questionable validity. The third generation fortrulation has been tested and f ound to be qualfiad (Rock e ns Moo + O R -6 90 t March 12, 1C06). '11415 f5 N o"I'~ The primary difference be ween he */LD' co MEcT". $66 ind "/ L h (braid _ angle. M estosformulations is a design e g t ennearninq yt qh.e c o7P. e n on t.h a t t h e ' /LF z,. 1 % 11 0 l E f o rm ura t ivn is qualified by similarity to the '/LE' % i BII 7 icrmulation, and is now preparing a similarity analysis to d monstrate qualification. Thus, the cable stored in ANO inventory is NOT
- qualified for use incide the Reactor Building. while new cable purchased with the */LE' formulation in qualified.
Qualification the of theHRRM General Atomics '/LD' i formulation t, dependent cable nw .sttached to o re an acceptable IN 0 M / similarity anal T.in fort ho omi nq from RocFbecto.. (, REF WL -
,% c/ S$7
. 8
,' R' . . * . . '
)
i THE ROCKBESTOS COMPANY as =cou irust.,o. euwin a ww un er - E.Q. DOCi1MENTATl0N Vs No. VV2-July 17, 1986 *! n IEWE Y Arkansas Power & Light Company f gag,,j P.O. Box 551 Little Rock, Arkansas 72203 Attention: Mr. J. D. Coleman
Dear Mr. Coleman:
Attached, in response to your request dated March 28, 1986, is a copy of our analysis of similarity between Rockbestos Coaxial Insulation types Polymer LD and Polymer LE. Very truly yours, THE ROCKBESTOS COMPANY 44<- George G. Littlehales Manager, quality Assurance GGL/dlf attachment cc: R. J. Gehm, J. M. Morganelli - Rockbestos s l 1H I'I E A member of the Marmon Group of companies \
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.l ANALYSIS OF SIMILARITY BETWEEN ROCKBESTOS COAXIAL INSULATION TYPES POLYMER LD AND POLYMER LE The first insulation layer in Rockbestos Class 1E Coaxial. Triaxial, and Twinaxial cables is a high temperature thermoplastic material, Polymer LD for !
second generation and Polymer LE for third generation. Second and third generation constructions with the same RSS designation are identical in all ,
.other respects.
In the first generation design, because of the angle of the shield braid wires, radial expansion of the dielectric (and braid) due to increased temperature caused axial foreshortening of the braid. This caused the center conductor to kink within the dielectric. The purpose of the first dielectric layer was to prevent the center conductor from coming into contact with the braid. The' cables were redesigned with a neutral braid angle which eliminated the foreshortening of the braid and the resulting kinking (2nd generation). Subsequently, a superior material (Polymer LE) became available and was incorporated into the design (3rd generatior.). Polymer LD and Polymer LE are both high temperature thermoplastics with similar electrical and physical characteristics. Because of the neutral braid angle of the second and third generation design, the Polymer LD and Polymer LE layers do not play a part in protecting the cable against faulting during a LOCA simulation, but were retained to maintain electrical equivalence with the first generation design. Exhibits A and B show center conductor kinking is not present in either second or third generation cables which have been aubjected to a sequence of thermal conditioning, irradiation conditioning and simulation of a LOCA within the guidelines established by IEEE-323-1974 and IEEE-383-1974.
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In summary, the dielectric performance of Rockbestos Class 1E Coaxial, Triaxial, and Twinaxial cables is based entirely on the t dn insulation layer (KXL-100 for solid dielectric or KXL-130 for foam diel'ctrie). We conclude that th" LOCA test results obtained using the third generation cables are completely applicable to the second generation cables and vice-versa. rePared h _
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EXHIBIT "A" i .J i ) , X-RAY PHOTOGRAPH OF RSS-6-104 AITER BRAID ANGLE CHANGE AND TDIPERATURE EXCURSION TO 180 C i PIRST INSULATION POLYME'R LD , 1 _ _ ..__ _._ _.__ _ _.__ _ _ _ __.._ . _._ _ _ __... . _ __ _. __ _.. _ . . _ _ . . . _ _ _ . j I 9 , i s o a
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&t THE ROCMBESTOS COMPANY sm ac.at stun. 7 o w=tn om =t num o m E.Q. DOCUMENTATION Fi!e No. V 4 July 14, 1986 W No. - @
REVIEWED BY, Schneider Consulting Engineers til Presidential Boulevard Bala Cynwyd, PA. 19004 Attention: Mr. Pietro Santavicca Cear Mr. Santavleca: This will confir:n our discussion regarding the following Reckbestes 7.55-6-113 Coaxla) cable utilized in radiation renitoring e:;ulpment by Arkansas Pcwer & Light Ceepany: Rockbestos sales order 007/5011 Rockbestos shop order 13101-01 Product Code Hkk-3024 The cable described above was cedered by General Atem.lc Cce;a y en their P.C. 777242. Our shop order was entered on 7/27/81. The R55-6-113 Coaxial cable supplied was second generation, quallfled under report QR-2806. Second generation cables employed a Polymer LD Inner dielectric. RSS-6-113 employing a Polymer LE Inner dielectric was successfully tested for our recent supplemental quallfication test repc,rt QR-6802, in tho very near future, as we discussed, we will have a similarity analysis available which will relate Polyrrer LD to Polymr LE constructions.
- Coples of this analysis will be sent to Mr. J. E. Livingston at Schneider Consulting Enginaers and to Mr. J. D. Cole .an at Arkansas Power & Light Co.
Although not particularly relevant to your question, I did ces. cent that R$5-6-il3 is a cellular dielectric construction which was not affected i by the problem of occasional failures at high temperature found in first i generation solid dielectric cables. 1 Very truly yours, TliE ROCKBE$705 COMPANY
!D George G. Littlehales i
Manager. Quality Assurance ggt./dl f j l tsa % egen m % n %
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