ML17212B709
| ML17212B709 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 06/23/1982 |
| From: | FLORIDA POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML17212B708 | List: |
| References | |
| NUDOCS 8207020173 | |
| Download: ML17212B709 (15) | |
Text
ELECTRICAL POWER SYSTEMS SURVEILLANCE RE UIREMENTS Continued the auto-connected emergency loads through the load sequencing system and operate for >
5 minutes while the generator is loadea with the emergency loads.
c)
Verifying that on the safety injection actuation signal, all diesel generator trips, except engine overspeed and generator differential, are automatically bypassed.
Verifying the diesel generator set oper ates for > 60 mi nutes while loaded to
> 3500 kw.
5.
Verifying that the auto-connected loads to each diesel generator set do not exceed the 2000 hour0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> rating of 3730 kw.
6.
Verifying that the automatic sequence timers are OPERABLE with the interval between each load block within +
1 second of its design interval.
d.
At least once per 18 months by verifying that each fuel transfer pump transfers fuel from each fuel storage tank to the engine mounted fuel tanks on each diesel via the installed cross connection lines.
4.8.1. 1.3 The Class lE underground cable sytem shall be demonstrated OPERABLE:
a.
Within 30 days after the movement of any loads in excess of 80$ of the ground surface design basis load over the cable ducts by pulling a mandrel with a diameter of at l'east 80$, of the duct's inside diameter through a duct exposed to the maximum loading (duct nearest the ground's surface) and verifying that the. duct has not been damaged.
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LUCIE - UNIT 1 3/4 8-4 6/23/82
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LUCIE - UNIT I 3/4 8-6 6/23/82
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SAFETY EVALUATION
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On 31 ~larch 1982 representaLives of Floric!a Powe'r 6 Light (FPL) and two cable m cnufacturers met with the AORS Subcommittee on AC(DC Power Systems Reliability.
Thc purpose of the meeti.ng was to provide the ACRS sub-committee with FPf. ancl industry experience with direct buried cable insta.iintions.
'The Class lE under'nu>>d s'stem at St. Lucie Unit 1 is a d iree t buried ins Lnllation.
The purpose of thc ACRS subcomn!it'tee discuss'ion was to determine whether, in light of existing data, a Tech'Spec,similar to the St. Tucie Unit 1 in situ cable performance monitoring specification
(.-.'4.8.1.1.3.b
&.c) is n".ccssary for. the direct I!>>ried cable installatic!n at St.
Lucie.
The consensus of L'he subcommiL'L'ee was Lltat in situ cable performance monitoring was not reel<<~ red.
Accordingly we request that existing St. Lucie Unit 1
speciFications i'4.8.l.l.3.b v'c he deletec.
The technical basis is providecl below.
Tl e St.
Luc,ie Tech Spec was provided as a measure to monitor the electrical properties of cabl,us in the Class 1E underground system until such time that the qualification of the cables for their ambient service condition could be demonsLrated.
The requisite qualificaLion has now been demonstrated.
The undergro<<nd C.iass 1E system is inst"lied above the normal water table, thus the predominant service condition is dry.'owever since the system is not dc.signed Lo proc]c!de L'he c >>try of during, for example, periods oC heavy water, water may enter the system rai.recall.
H.igh temperature and radiation nre>>ot associated with the Class 1E underground system.
Accordingly the only enviro>>m.. >>tan s<<rvico fac tor that is a design consideration is water.
The ca! I <>~ay op.<<at>> jn a c! ry 01 n cet, ~r an alternately wet and dry c'nviro>>mont.
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'4'ater is>>ot a>> unusual or. uniq))e cable design consideration.
Designing to accommodate wet environmo>>tal co>>diti<)n. is commonplace, as is the use of direct b<<ried cabLe installation Cables have been installed and.
have successfully operated under rivers and in submarine service as early as the 1880's there i" consider ble industry experience with desig>>ing cables tn accommodate wct conditio>>s.
The qualification of the St. Lucie Unit 1 cables for the service condi.tions of.wet, or dry, or alternately wet and dry ls a two fold process,
- namely, o Cables operati>>g for many years ))ndcr'imilar. operating conditions to those aL St. l,ucie Unit 1 are shown to mai<<tain ti)eir electrical properties in the i)) situ en vi.ronmen t.
o Cable insul )tions <<til ized at St.
Lucie 1 are shown by accelerated laboratory tesLing Lo exi)ibit a superior ability tn accommodate thc service environ)neat than the insulations th't have actually demonstrated in situ their ability to
')ccommodate the wet, or dry, or alter<<ately wet and dry service environment.
Each cable man<<fact))rer supplying cable for the underground Class lg system must inde))endenLly test Lhc cable insulation system to cohfirm their cables resistance to electrical deterioraLion.
Representative cable manufacturer's test data has been provided L'o tl)e ViRC St)ff in Appendix 3A to the St. Iucie Unit 1 I'SAR, and as an art))chment to I'PL'>> St.
Lucie Unit 2 letter L-81-348 dated 1J. Aug<<st 198 L.
Tt sI)nuld also be no'd tl)nt.tl)u 1>> s.i.L'<<cable tc: ted at St. Lucie Unit 1 pursuanL to Teci) Spec 4.8.l.i.'3.b h.c l)as
..hown no electrical deterioration of the c:)ble.
Ti)c
) cs))Lts of tl)e UniL' i>> siL'u tesL pr))gram are provided infra.
6/23/82
3 of 4 The. qiial.ification of t:he unrir!rground cables at St.
Luci'e Unit 1 can best be built on the relat.loiiship hr twecii long-tern! field data and accelerated i.aborntory stiidies.
Me feel.
t:hat this is a very reliable way to predict cable li.f>> liy bui'Iding on ri(:Lu'ii service experience of similar materials.
As tho most representative
(>f L'he tylie of cable being used at St. Lucie (buL havlii" a loni; service rc<<ord) are the butyl rubber insulated cables in tlie diict and inanhole syst: em of (~linmi Beach.
The envi.ronmental conditi.ons such;is hrat, decaying vegeLat:ion, torrential rains, hurricanes and ocean tidal actioii at i<iami Beach are worse than the conditions at St. Lucie.
Ituch of tlie itia(ni Beacli cable system operates continually submerged.
Another segment is at the tide l.ine and hence is wet twice a day, while t:he rest oi the system is sub jer:ted t.o only occas'ional floo:ling from ra" n or sea wat<<r No ritteinpt is made t o cont!rol. tlie wat:cr in tliis system except w!ien (ir<.w:;:iru working on tlii systnn!.
))at". from Llie i'1:;in!i Beacli syst'e(n shows L'liat tl!e service experience on these riibher nsul; tcd rabies inst:allcd b(.ginning in the 1940's has been excellenL.
he have reviewed FPL cable fri.ilurc records and interviewed the supervisors, splicers
'ind engineers in th(iL distri( t and have found that t?iere has never been an elect.rical dctcrioraLinn failure of any kind on these cables or, the
- plices as. ociatcd witli them.
These cables operate in all degrees of wet, dry and alternately wet an(l dry, 'is well as, in both sea and fresh water situations without'!oblens.
This vast: Fpl In sit:ii experience has qualified butyl insulation Cor a wet, or. dry, or iltcrnately wet and dry environment:.
- New, Improved insulating materials h;ive taken t:he place of butyl. for such appli<<ations, e.g;,
rrossll,nl;ed polyetliyl(!ne and ethylene propylene (EPR).
The need t:1!en is to show how t.liese maL(.ri:ils wi.ll perform in an environment siniilar to tiarni Beach.
A('(:(iluraL"d tests ri I 1(iw <ine 1 o <<omlia rc oiiu nia Luria i with other ma t rials.
tine I:vpic:!I exon lil(! of sii<<li.( 'est ln il.iustratcd by Figure 1.
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been de~<eloped by onc of Lhe suppi.icrs nf Lhe SL. l.ucie Unit 1 cables.
'I Note L.>at tl e cable sampl.cs are short and have very small conductor:
The thin 'walls of insulat:ion magnify thu effects of moisture.
The 90 C water i" <<nother accclcrat:or.
I'ower fact. or is a term <ised by cable engineers to dcsrril>e the amount of electrical,leakage through acable insu1atlon.
The crosslinkcd poiyethylene has t'hc. lovesL and most stable value.
From this, and large quant:ities of similar. evaluations, crosslinkecl polyethylene is rated as:> superior cabi.e insul.at:ion Cor usc in a wct environment.
The EPR is ai>o stat>lc and has other properties that make it very acceptable.
It mu t be noLed L'hat L'his is a very severe laboratory test since butyl has proven to be complc,tely satisi:uctory in act:ual service, but "failed" this test in a short time.
Thc point
(:o l!e made by the accelerctted L'csting is t:hat the cable insulations FVL h-s sl>c.cil icd, purcha. <<d
<<n<l install<<d at St.
Lucie Unit 1 are among the be:,'. that are obtainable anywhere in t:he world for electrical stabili.ty undecvet:,
or dry, or tlternaLely veL'nd dry conditions.
From the standpoint of:> cable engineer, t'hese cables are positively qualified for the environment of: St. Lucic ancl can be. expected to perform as designated for the service life of the p'lant.
FPI. has b<.en conducti.ng insulaL'ion resistance (meggar) an<i high volLage dc tests at SL. Lucie Unit 1 since 1978.
The cables have te'sted and worked perfertly.
'r!e revi<<weel t:he tesL dat t and sav, a rather vide range, of leakage current cl<<ring the dc t<>sts of t:lte 5 kV cables.
They have varied from 0.0 to.i7 mi<;roamper'es over the 4 year period.
On <larch 25, 1982, circuit -887 that had Lhc
.17 microan>p reacling in 1981 vas retested.
Careful'leaning of thc porcclains yielclcd a>>c.v net.
I.c.alcnge was 0. l5 microamps after 10 minute'lcmonst.raLing Lhat Lhe.lealcnge was duc Lo dirty connections and not due to deterioration oC t:he <:lc<.t'rical, insulation.
The te. t levels of all cable.s aru
'3 to 10,000 times I!<<t't.cr t)>an L'he required level.
He bel.ic <e LhaL th<i'i, Hiatni lluach c:xpur i< nce coupled with the cable manu:act<
l <'.r s lab'>ratory
< <<sL in;; q<<al iC ies the SL'.
L<tc ie cable for a wet, or dry, or niLernatcly wet and <lry <>nvironmcnt'.
Th<.s Tccltnical Specifications 4-8."..1.3.b 6
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STAT" OF FLOR1DA
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E. A. Adomat being irst duly sworn, deposes and says:
Tha-he is Executive Vice-President Lignt Company, the licensee herein; of Florida Power That he has executed the foregoing document; that the state-ments made in 'this said document are tru and correct to the best of his knowledge, information, and bel"'ef, and that he is authorized to execute the document on behalf o said
'0 E. A. Adomat Sub cribed and sworn to before me this day of I
19 NOTARY. PUBLIC, in and for the County of Dade, Stat of Florida Ny commission expires:
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