ML17347A653

Outside Containment Limitorque Wire Rept.

ML17347A653
Person / Time
Site:	Turkey Point
Issue date:	12/11/1987
From:	FLORIDA POWER & LIGHT CO.
To:
Shared Package
ML17347A651	List: ML17347A650 ML17347A653
References
JPE-PTPO-87-350, NUDOCS 8712150096
Download: ML17347A653 (30)

Text

TURKEY POINT LI.l TORQUE WIRE REPORT page Z o f '>0 FLORIDA POWER AND LIGHT COMPANY TURKEY POINT UNITS 3 AND 4 OUTSIDE CONTAINMENT LINITORQVE WIRE REPORT JPE-PTPO-87-350 87i 2i50096 87i2i i PDR ADQCN, 05000250 P PDR

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TURKEY POINT'LIN RQUE WIRE REPORT page 3 of 20 TABLE OF CONTENTS Sec t'i on. ~Pa e

1.0 INTRODUCTION

..................................... 4 2 .0 REQUIRED ENVIRONMENTAL PARAi iETERS ................ 5 3.0 OPERABILITY OF VULKENE SIS VW-1 .................'. 7 4.0 OPERABILITY OF (UL) IDENTIFIED WIRES 10 4.1 Useful life of PVC and polyethylene 11 4.2 Radiation resistance 14 4.3 Harsh temperature r'esistance 15 5.0 OPERABILITY OF UNIDENTIFIED WIRES ................ 17

6.0 CONCLUSION

S .............."....................... 19 REFERENCES ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 20 Appendix A TABLES Appendix B BG8cE test of Vulkene SIS Appendix C RDI / FPL test of Limitorque operator Appendix D UL standards pertaining to TW insulation Appendix E UL standards pertaining to SIS insulation Appendix F UL standards pertaining to TFN insulation

. TURKEY POINT LI: ROUE WIRE REPORT page 4 of 20

1.0 INTRODUCTION

Limitorque operators within the scope of 10CFR50.49 at Turkey Point Units 3.8c 4 were inspected in response to I.E.N. 86-03 to insure that they contained qualified wires's a result of that inspection, several wires were found in outside containment operators which wero either not of a type qualified by Limitorque or were not identifiabl>>.

In all cases where wires were found which were not of a type identified as qualified for use at Turkey Point, the wires were replaced with a qualified type. Wires which are considered to b<~

qualified are:

1) Teledyne Thermatics, Tefzel 280, Doc Pac 36.0

2) Rockbestos, Firewall SIS, Doc Pac 23.0

3) Raychem, Flamtrol, Doc Pac 21.2

4) General Electric, SI57279, Doc Pac 13.0 Five types of wire were identified for which nuclear type test documentation was not supplied. However such insulation did have

('UL) label linking it to industry tests and manufacturing pro<:i duress.

Each of these types is insulated with either PVC or with X-linked polyethylene.

Nanufacturer and type of wire could not be identified for some wires.

This was because the wires were typically short and bore either no marking, incomplete marking, or unidentifiable marking.

A visual inspection was performed on each wire removed. There wer-. no signs of aging or cracking evident in any of the, insulation. .'ill wires appeared to be in good condition and were functional when t.hey were replaced with their fully qualified counterparts.

This report is an investigation of the types of wire found and of t.he operability 'of the Limitorque operators containing these wi>es,

.TURKEY POINT LIM RQUE WIRE REPORT page 5 of 20 2.0 RE UIRED ENVIRONMENTAL PARAMETERS Normal o eratin tern eratures Doc Pac 17.2 for Limitorque operators provides that the normal ambient temperature for all outside containment Limitorque operators is 40<('.

Assuming a 50 C temperature rise inside the switch compartment <.over account for occasional short duration operation of the valves, 45' is the assumed normal ambient temperature inside the switch ompar tment cover. Since the wires are all in low current control service, self heating of the wires is negligible. Therefore the assumed normal operating temperature of the wires is 45< C.

Accident conditions The Limitorque operators outside containment on the 50.49 list c.an subjected to either of two distinct types of harsh environments. y<on>>

of the operators could be exposed to both types of accidents.

The first group consists of, the following tag numbers'.

HOV 3/4 350< 843A< '843B< 860A< 860B< 863A<863B< 869< 872< SSOA 8808 MOV-878AT 878B.

Limitorque doc pac 17.2 Rev.O provides that these operators coul.<3 exposed to radiation but not to excessive temperature. These located in the auxiliary building. The highest dose expecte<'1 in op<.rar.ors're this area is 2.0x10<< rads at the outside of the switch compartment cover. This is the total integrated dose over 40 years of normal operation followed by the worst-case design basis accident. The longest required operating time is 31 days post accident.

The second group consists of the following tag numbers:

lOV 3/4 1403, 1404, 1405 Limitorque doc pacs 17.2 and. 17.3 provide that these operators con)<i b~

exposed to steam but not to excessive radiation. These are located near high energy secondary coolant lines. A line rupture coul<i r.<.s<<lt in short term temperature of 212' at the outside of the s<-itch compartment cover. The longest required operating time for any uf these operators is 30 minutes post accident.

Furthermore, Reference 4) documents a high energy line break experiment performed by Research Dynamics Inc. under supervision of Florida Power & Light Co. During the test'a Limitorque operato~

subjected to an environment more severe than the Turkey Point required temperature profile for an outside containment high energy Line br'.ak.

The test data demonstrates that the temperature inside the limit switch compartment will not exceed 1794 F (82<<C) where the wires are located. The test temperature profile exceeded the required profi)e for conservatism. Self heating of the wires is negligible since they ar<~

in low current control service. During the test the wires were energized and the valve was cycled periodically.

.TUREEY POINT LIN)RQUE WIRE REPORT page 6 n f 20 Assuming a Oo C temperature rise i ns ide the sw i tch compa r tme n t c o ve r t o account for occasional short duration operation of the val ve s , 8 7<< is the assumed accident ambient tempe ra tu re i ns ide the sw i t ch compa r t. me n t cover . Since the wires are al 1 in 1 ow curren t control service , s e f 1 heating of the wires is negligible . Th e r e fore the assumed acc i iii..n t operating tempe ra ture of the w i res is 8 7 o C .

"I II

'I

TURKEY POINT LIM ROUE WIRE REPORT page 7 of 20 3.0 OPERABILITY OF VULKENE SIS VW-1 Vulkene SIS VW-1 was identified as follows:

DESCRIPTION 12 AWG stranded CU MARKINGS 12 AWG 600V E-7088-L VULKENE SIS (UL) VW-1 MANUFACTURER General Electric UL RATING STS INSULATION TYPE Cross-Linked Polyethylene As was stated in the introduction, all removed wires were inspect,e>3 and no age related degradation of the insulation was found. The following demonstrates that no age related degradation (cracking or difficulty of bending) would be expected.

This type is insulated with cross-linked polyethylene. It is qualifi>?>'.

in accordance with IEEE 323-1983 as documented in reference 6). Tt can withstand all required environments as given in section 2.0 i'i",h margin as demonstrated below.

Reference 6) documents that the test samples were subjected to 1'i1 rads to 'simulate radiation received during normal plant operati.on.

samples then received 1x10~ rads to simulate accident conditions inside containment.

Section 2.0 provides that the maximum exposure of this wire i.s 2.0x10~ rad. The tested dose exceeds the requirement of 2.0x10*

with ample margin.

Reference 6) also provides that the test samples were then subj>>c>

to the following high temperature environment:

1) 160O C for 100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> in circulating air for thermal aging.

The samples were then subjected to the following steam environment to simulate a LOCA.

2) 296o F for 1. 1 hours1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 3 ) ramp from 296o F to 190o F in 1. 1 hours

4) ramp from 190oF to 120OF in 17 days Reference 6).'ocuments that the test samples passed the abov>> exp>assur>

in accordance with IEEE 323-1983.

.TURKEY POI'AT LI.) ROUE WIRE REPORT page 8 of 20 ualified life It is now demonstrated that the period 1) exposure envelopes the 20 year installed life at assumed normal operating temperature. This is done by. calculating equivalent life at 45O C using Arrhenius methodology. See section 2.0 for derivation of assumed normal operating temperature.

Doc Pac 1001 Rev.0 Appendix D provides that the activation energy fi~r Z-linked polyethylene is 1.13 eV.

Reference 2) (EQN.4-16) provides:

ln(t2/tl) = A/K (1/T2 1/Tl) where t2 is the life at temperature T2 tl T2 is is the life at temperature Tl temperature in degrees Kelvin Tl is temperature in degrees Kelvin A is the activation energy (eY)

K is Boltzmans constant = 8.617E-5 Rearranging the equation and substituting data from test period (1) above:

[A/K (1/T2 1/Tl)]

t2 (tl) e where T2 45 + 273.15 = 318.15 degrees- Kelvin 1.13 eV tl Tl 100 150 hours0.00174 days <br />0.0417 hours <br />2.480159e-4 weeks <br />5.7075e-5 months <br />.

+ 273.15 = 423.15 degrees Kelvin

[ 1.13 / 8.617E-05 ( 1/ 318.15 1/ 423.15 )]

t2 -"100 e t2 = 2766363 hours 315.79 years 8760 hours0.101 days <br />2.433 hours <br />0.0145 weeks <br />0.00333 months <br /> Based on the period 1) test exposure of 150o C for 100 hours, t.he qualified life of Vulkene SIS VW-1 wire for Turkey Po int i rrs ta leii 'rr 1

outside containment Limitorque operators is greater than the 40 year design life of the plant. This exceeds the 20 year irrstalled )i.fe of these wires.

.TURKEY POINT LIii ROUE WIRE REPORT page 9 o f 20 Performance under accident conditions at the end of installed li fe It is now demonstrated that the period (2) exposure envelope~ thi; required temperature profile for a main steam line break outside containment at the end of installed 2 provides that these wires will not exceed 87>C during life.'ection accident conditions. The following calculation does not tak>> credit.

for the thermal lag of the Limitorque operator. The full 100< C st~am exposure is used for conservatism. Assuming a 5' temperature risi.

account for occasional short duration operation of the valves, )05< 6 is the assumed highest accident temperature of these vires, The period 2) test exposure was 296' (146') for 1.1 hours1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />. This envelopes the required main steam line break temperatur.e priifile ot 30 minutes at 105< C with ample margin.

This material is th'erefore acceptable as an electrical insu).ntor afte!

being subjected to the worst case postulated radiation or tempera urc exposure inside a Limitorque operator outside containment at the of its installed life.

Based on the foregoing it has been demonstrated that'imitorquu operators containing Vulkene SIS VW-1 wire located outside coritainment at Turkey Point would have performed their safety function haik !h.:>

been called upon to do so.

Additional testing covering Vulkene SIS VW-1 type wire is containi-:if i:i Turkey Point Doc Pac 13.0.

,TURKEY POINT LIA RQUE WIRE REPORT page 10 of 20 4.0 OPERABILITY OF UL IDENTIFIED WIRES Table 1 lists identified wire types found in the outside containment..

Limitorque valve operators. These wires are all insulated with eit.he.

PVC or X-linked polyethylene.

Section 4.1 demonstrates that the insulation has a useful 11fe .I:>ng~'i than the installed life and could then withstand a design basis accident.

Section 4.2 contains a discussion of the radiation resistance of PV X-linked polyethylene. It is demonstrated that the insulation 'nd would have remained useful if it design basis radiation exposure.

had been called upon to withal;ani) a Section 4.3 contains a discussion of operability during and following harsh temperature exposure.

would have remained useful design basis temperature ifItitis demonstrated th'at the insulation exposure.

had b'een called upon to withstor<

and no age related degradation of the insulation was found. The following demonstrates that no age related degradation (cracking or difficulty of bending) would be expected.

The maximum installed life of any of these wires has been approximately 20 years. This is the time between original installation during construction of the power plant and the t.ime .:~ien the wires were removed.

Doc Pac 17.2 for Limitorque operators provides that the normal ambi..n."

temperature for all outside containment operators is 40<C. Assuming 5'C temperature rise to account for occasional short duration operation of the valves, 45<C is the assumed normal ambient temperature of these wires since the wires are all in low current control service.

'The lowest (UL) temperature rating of any of these wires was 60< C.

Section 2) provides that the ass'umed normal operating temperature, if the wires is 45<C. Therefore all of these wires are well within their temperature ratings during normal operation.

Section 2.0 of this re'port provid'es that these wires will not ex.~.:"d 87< C during accident conditions. The following calculation does not take credit for the thermal lag of the Limitorque operator. Th~ full 100 C steam exposure is used for conservatism. Assuming a 5< C temperature rise to account for occasional short duration operation of the valves, 105<C is the assumed highest accident temperature of thes-wires.

Doc Pac 1001 Rev. 0 Appendix D provides that:

(1) log>0(life in hours) "- slo e of curve + intercept of curve ambient temp ('K)

(2) PVC X-linked ol eth lene slope= 5000 5676 intercept= -10 -10.77 act. energy= .99 1.13 Reference 2) (EQN.4-16) provides:

(3) ln(t2/tl) = A/K (1/T2 1/T1) where t2 is the life at temperature T2 tl is the life at temperature Tl T2 is temperature in degrees Kelvin is temperature in degrees Kelvin T1

's

~

A is the activation energy (eV)

K Boltzmans constant = 8.617E-5

TURKEY POINT Lli~IITORQUE tftIRE REPORT page 12 o f 20 Useful life of PVC."

Substituting data (2) for PVC into equation (1) above:

logxo(life in hours)= 5000 10 = 5.72 45oC + 273 life in hours = 105 >> hours "- 524,807 hours0.00934 days <br />0.224 hours <br />0.00133 weeks <br />3.070635e-4 months <br /> at 45o C

~

Section 4.3 of this report provides that PVC has been tested at 1"1" C for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> in a circulating air oven per (UL) standards. Therefo> e no chemical reactions or phase changes occur at or below 105o C. .It is, therefore acceptable to use arrhenius methodology to calculate equivalent life as follows.

The equivalent life at 45'C representing the 30 minute accident duration at 105OC is calculated:

Rearranging equation (3) and substituting data (2):

[A/K (1/T2 1/T1)]

t2 (t1) e where T2 45 + 273.15 = 318.15 degrees Kelvin A .99 eV t1 .5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> T1 105 + 273.15 = 378.15 degrees Kelvin

[ .99 / 8.617E-05 ( 1/ 318.15 I/ 378.15 ))

t2 = .5 e t2 -"154 hours0.00178 days <br />0.0428 hours <br />2.546296e-4 weeks <br />5.8597e-5 months <br /> Subtracting the equivalent life at 454C representing the 30 minu.".e accident duration at 105oC from the total useful life at 45oC:

524,807 hours0.00934 days <br />0.224 hours <br />0.00133 weeks <br />3.070635e-4 months <br /> 154 hours = 524,653 hours0.00756 days <br />0.181 hours <br />0.00108 weeks <br />2.484665e-4 months <br /> 524, 553 hours0.0064 days <br />0.154 hours <br />9.143518e-4 weeks <br />2.104165e-4 months <br /> 3 ~fear = 59. 9 years 8760 hours0.101 days <br />2.433 hours <br />0.0145 weeks <br />0.00333 months <br /> The useful life of PVC insulation is 59.9,years at 45o C plus 30 minut'es at 105'C. This exceeds the 20 year installed life of the vires.

V TURKEY POIYT LIifITORQVE MIRE REPORT page 13 o f 20 useful life of X-linked ol -eth data (2) for X-linked polyethylene into equation ()) above:

-lene.'ubstituting logxo(life in hours)= 5676 10.77 = 7.079 45O C + 273 life in hours = 10~ o>> hours = 11,996,556 hours0.00644 days <br />0.154 hours <br />9.193122e-4 weeks <br />2.11558e-4 months <br /> at 45<C

~

Section 4.3 of this report provides that X-linked polyethylen~ h:~s been tested at 121OC for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> in a circulating air oven per (UL) standards. Therefore no chemical reactions or phase changes oi..< ur;~t or below 105OC. It is therefore acceptable to use arrhenius methodology to calculate equivalent life as follows.

The equivalent life at 45' representing the 30 minute accident duration at 105OC is calculated:

Rearranging ~equation (3) and substituting data (2):

[A/K (1/T2 1/Tl)]

t2 (t1) e where T2 = 45 + 273.15 = 318.15 degrees Kelvin A 1.13 eV tl T1

.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> 105 + 273.15 = 378.15 degrees Kelvin

[ 1.13 / 8.617E-05 ( 1/ 318.15 1/ 378.15 ))

t2 = .5 e t2 = 346 hours0.004 days <br />0.0961 hours <br />5.720899e-4 weeks <br />1.31653e-4 months <br /> Subtracting the equivalent life at 45OC representing the 30 duration at 105' from the'total useful life at 45'C: minut.'ccident 11,996,556 hours0.00644 days <br />0.154 hours <br />9.193122e-4 weeks <br />2.11558e-4 months <br /> - 346 hours0.004 days <br />0.0961 hours <br />5.720899e-4 weeks <br />1.31653e-4 months <br /> = 11,996,210 hours0.00243 days <br />0.0583 hours <br />3.472222e-4 weeks <br />7.9905e-5 months <br /> 11,996,210 hours0.00243 days <br />0.0583 hours <br />3.472222e-4 weeks <br />7.9905e-5 months <br /> x ~1 ear = 1369 years 8760 hours0.101 days <br />2.433 hours <br />0.0145 weeks <br />0.00333 months <br /> The useful'life of X-linked polyethylene insulation is 1369 years at 45o C plus 30 minutes at 105'C. This exceeds the 20 year installed life of the wires.

.TURKEY POINT LDI ROUE WIRE REPORT page 1 i of 20 4.2 RADIATION RESISTANCE OF PVC AND X-LINKED POLYETHYLENE Section 2.0 of this report provides that maximum normal operating exposure plus accident exposure for Limitorque operators outside containment is 2.0x10<< rad.

Wire types 1, 3 and 4 are insulated with PVC. Reference tab.le I <if this report for wire 1)'age 3-11 discusses radiation test results of vario<<~

types.'eference formulations and configurations of PVC. The conclusions are that no serious damage occurs below 5x10<< rads. One sample lost less than "0"...

tensile strength at 1x10<< rads.

Reference 2) page C4 shows PVC as being generally satisfactory <<s insulating material at exposures exceeding 1x107 rads. This is 5 times the expected worst case dose.

This material is therefore acceptable as an electrical insulator:<f4< r being subjected to the worst case postulated exposure of 2x10<'ad: .

Wire types 2 and 5 are insulated with X-linked polyethylen>> f~r.< n.<

table 1 of this report for'ire types.

. R<

Reference 1) page 3-16 discusses radiation test results of X-linked polyethylene. The conclusion is that no serious damage occurs below 4. 4x10~ rads. Service 1 imi ts of 1x108 are re<. ommi~n<i'! .

Reference 2) page C4 shows polyethylene as incurring only incipient.

mild damage at exposures exceeding 1x107 rads. This i's 5 tim<.s tha; expected worst case dose.

This material is therefore acceptable as an electr ical i,nsu)<>to<. a f cr <

'being subjected to the worst case postulated exposure of 2x10" rads.

r I si E

.TURKEY POINT LI. RQUE WIRE REPORT page 15 of 20 4.3 OPERABILITY DURING AND FOLLOWING HARSH TEMPERATURE EXPOSURE Underwriters Laboratories requires all wires bearing the [LL) label t:<

undergo certain tests as outlined in various UL standards. This is a discussion of the tests required for each UL listed type identified in table 1 of this report and of. their ability to withstand the w~rst-case postulated temperature exposure.

TW Types 1 and 4 are UL rated TW wires.

Reference 8, paragraph 37.1 provides that UL rated TW wire und ~rgr~

heat-shock test. The wires must be subjected to 121oC for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> in circulating air oven. The wires shall not show any cracks either on the surface or intexnally after completing t.he test.

Section 2.0 of this report provides data that the accident operat.irrg temperature of these wires is 87OC for 30 minutes. If the therm'~l la<(

is not considered, using the full 100OC steam exposure for conservatism, and assuming a 5'C temperature rise to account for occasional short duration operation of the valves, 105'C is then the highest accident temperature of these wires.

The (UL) test of 121oC for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> envelopes the consexvat.ive a<<.ide>>t profile of 105OC for 30 minutes with margin.

This insulation type is therefore acceptable as an electrical insulator after being subjected to the worst case postulat<.<i temperature exposure.

Based on the foregoing it has been demonstrated that Limitorqu<-

operators containing UL type TW wires located outside containment rrt Turkey Point would have performed their safety function had they be<.n called upon to do so.

SIS Types 2 and 5 are UL rated SIS wires.

Reference 11, Table 50.231 provides that UL rated STS <ice undergo an aging test'.. The wires must be subjected to 1214C for hour in a 1

circulating air oven'. The wires must retain at least 70%%u of their original elongation after completing the test.

Section 2.0 of this repoxt provides data that the accident operating temperature of these wires is 87oC for 30 minutes. If the thermal ):xg is not considered, using the full 100oC steam exposure for conservatism, and assuming a 5OC temperature rise to account f<)r occasional short duration operation of the valves, 105'C is then the highest accident temperature of these wires.

The (UL) test of 121'C for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> envelopes the conservative a<.cide>>t profile of 105'C for 30 minutes with margin.

'This insulation type is therefore acceptable as an electrical

.TURKEY POINT LXif RQUE WIRE REPORT page 16 of 20 insulator after being subjected to the worstWase postulated temperature exposure.

Based on the foregoing it has been demonstrated that Limitorque operators containing UL type SIS wires located outside containmen'.

Turkey Point would have'performed their safety function h<<d the y be~.n called upon to do so.

TFN Type 3 is UL rated TFN wire.

Reference 10, paragraphs 54.1 and 54.2 provide that UL i.<<ted TFN iiii-.

undergo a heat-shock test. The wires must be subjected to 121<C'or hour in a circulating air oven. The wires shall not show ariy cr<<rks either on the surface or internally after completing the test.

Section 2.0 of this report provides data that the accident i.per:zi.in ~

temperature of these wires is 87'C for 30 minutes. If the t.berm<<1 l.."

is not considered, using the full 1004 C steam exposure for f'r conservatism, and assuming a 5< C temperature rise to account occasional short duration operation of the valves, 105> C is theii highest accident temperature of 'these wires.

The (UL) test of 121< C for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> envelopes the conser vai ive <<i.< id<'n

~

profile of 1054 C for 30 minutes with margin.

This insulation type is therefore acceptable as an electric<<l insulator after being subjected to the 'worst case postulated temperature exposure.

Based on the foregoing it has been demonstrated that Limitorqu>>

operators containing UL type TFN i'ires located outside containmcr:t Turkey Point would have performed their safety function h<<d th>>.- b --n called upon to do so.

.f S+t tVl

"TURKEY POI'AT Lli RQUE WIRE REPORT page 17 of 20 5.0 OPERABILITY OF,UNIDENTIFIED WIRES

~lanufacturer and type of wire could not be identified f<>r some <'ir es.

This was because the wires were typically short and bore either no marking or incomplete marking. These wires typically resembled the wires described in the previous two groups. It is likely that they were insulated with one of the same materials. No further testirr'<-s been performed to demonstrate this, however these wires are considere<)

acceptable for the following reasons.

As was stated in the introduction, all removed wires were visually inspected and no age related degradation (cracking or diffi.c<<Lt'f bending) of the insulation was found. The following demonstrat<.s tl.a'.

no age related degradation would be expected.

It is believed that the insulating materials found are PVC and linked polyethylene. These materials are shown to be acceptable {'r.

use in section 4.0 .thru 4.3. They have been evaluated for usetul life, temperature withstanding and radiation resistance. They ha~:.

been demonstrated as satisfactory for use in outside containment Limitorque operators at Turkey Point.

Reference 5) article 310 and article 402 give temperature ratings of (UL) listed cables. The lowest temperature rating listed is Hr}<<r .

Insulation with this temperature rating is typically t.hermoplast>< .

Therefore all commonly used insulation is operated within its temperature rating during normal operation based on the assumed no< m.-<l.

operating temperature of 45<<C from section 2.0 of this rep<.'r.t.

Reference 2) figure C-1 gives radiation resistance of common)y used thermoplastic insulation. This figure shows that all common)c <<::e<i insulations, with the exception of Teflon, are capable of wi thstan<) i maximum required dose of 2xl0<r rad.

n<'he Reference 2) appendix B provides activation energies nf commonly us~~<i organic materials. The materials commonly used as electrical insulation typically have activation energies greater than thr .99 of PVC. Insulation other than PVC would therefore have a longer <<s. !<<1 ~

life than PVC. Section 4.1 provides that PVC has a useful life ot'9.9 years at the assumed normal operating temperature plus 30 <nir)<r t<.~

assumed accident temperature. This is greater than the 20 yen.. n.'he installed life. Therefore other commonly used insulations <'ou ld i<<<v<

useful lives exceeding the 20 year installed life.

As in section 4.3 of this report, (UL') testing typically require.=. a 121' circulating air test which is one hour in duration. These tests envelope the 87'C for 30 minute required accident profile from se<.:ti<.<<

2.0 of this report. Therefore all commonly used (UL) listed wire <rrn withstand a steam line break accident inside a Limi torque <iperrzt<ir outside containment at Turkey Point.

The discussion to this point in section 5.0 has been based on assumptions of insulation types used in unidentified wires. These assumptions are believed to be true but can not be proven for the

.case of unlabeled wire. Therefore FPL has conducted the test.ing program

, outlined below.

i~ i~

TURKEY POINT LI.'f RQUE PIRE REPORT page 18 <.. f 2<)

Reference 4) documents a high energy line break experiment pert'oem<.d by Research Dynamics Inc. under supervision of Florida Pn<'er &. Lieth'I:

Co. During the test a Limitorque operator +as subjected to an environment more severe than the Turkey Point required tempe<nt<<r<

profile for an outside containment high energy line break.

The folio~'ing are paraphrased excerpts from that report.

One ohjecti ve of Che experiment <"as to demonstrate that any <'i re, no maCter vhat tp'pe or hov i t got to end-of-li fe condi Cion, 'vo<<ld be adequate. That is, Che addi ti onal environmental stress put or) the valve acCuator during a steam line break accident <'i ll not ther operat:or or indication misact'ion.

caus<'i The s team line brealc vas chosen over the radi a ti on en'i ronm<. n t br~eau ll radiation at levels less than 10~ rads <~i have li t tie eff<.ct ot'he<

than Co cracfr the i nsulati on @hi le condensation from the st~:.<m co<i).!

provide a conducti ve path causing misoperation. Tn addi Cion, deliberaCe flares (cuts in insulati on and stripped <:i res) vi'l l mechanical lp'imulate thermal and radi a Ci on aging.

The limi torque actustor @as CesCed in trio different c<>nfi gur a i <>n>>- C

,<"i thout using qualified vi ring and <~i Ch man~ deliberate t!aws in. the s~iring. All of Che indicators and ski Cches vorlred as requi<ed.".o shorting occurred.

The steam test enveloped Che maximum pressure and Cemperatu< e pr nfi 1<~>>

vhi ch. are required at TurAey Point. Addi ti onal margin <'s induce<7 the 1 on g warm up Ci mes using s team.

The above objecti ve vas achieved indicating that the vi re i nsul ~t ion is not required for proper operation of the valve during a<iv< rse environmental condi Ci ons in ou ts i de con tai nmen app l i ca Ci ons.

C Therefore the vire type is not important for use in Limitorque operators

.TURKEY POINT LIt RQUE WIRE REPORT page 19 of 20

6.0 CONCLUSION

S Based on the foregoing it has been demonstrated that the wires removed from the Turkey Point outside containment Limitorque operators would have performed their safety function had they been called upon to do so ~

0 I

TURKEY POINT LI~ RQUE WIRE REPORT page 20 of '='0 REFERENCES')

EPRI NP-2129, Project 1707-3, Final Report, November 198),

Radiation Effects on Or anic Materials in Nuclear Plants.

2) EPRI NP-1558, Project 890-1, Final Report, September 1980, A Review of E ui ment A in Theor and Technolo v.

3) Shapiro, J., Radiation Protection, second edition, Haxvard University Press t1981)

4) Research Dynamics Inc. (Nov. 8,1986), Ex erimental Testin of Wirin for Limitor ue Valve Actuator for Florida Power h. Li ht.

~Com an

5) Schram, Peter J., The National Electrical Code Handbook, McGraw-Hill Book Company (1984)

6) Elam, Gary J., Patel Engineers, Final Test Re ort for Anaconda Continental SIS Cross-Linked Pol 'olefin and G. E. Vu.'!cen6.

SIS Cross-Linked Pol eth lene Cables used in the Calvert. (:cliffs Nuclear Power Plant. Re ort 'No. PEI-TR-860500-02 issued Jan. 2 1986

7) ZPCEA Puh. Mo. 6-6 1-402(Third Edition) MEMA'uh. Mo. )1C 6-107:)

Revision 2-September 1977, IPCEA-NEMA Standards Publication Thermo lastic-insulated Wire and Cable for the Transmission an))

Distribution of Electrical Ener I

8) UL Standard 83-1986, Thermoplastic insulated wires nnd <..abLeN.

9) UL Standard 44-1983, Rubber insulated wires and cables.

10) UL Standard 62-1983, Flevible cord and fivture wire.

11) UL Standard 1581-1986. Reference standard, for electrical wire>>,

cables, and flexible cords.

I' ~