ML18127A522
| ML18127A522 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 12/06/1977 |
| From: | Robert E. Uhrig Florida Power & Light Co |
| To: | Kniel K Office of Nuclear Reactor Regulation |
| References | |
| Download: ML18127A522 (11) | |
Text
U.S NUCL,EAR REGULATORY C IISSI NRCPQRM 195 0-75 I NRC DISTRIBUTION FoR PART 50 DOCKET MATERIAL QOCKET NUMBER FII,E NUMBER PSAR/FSAR AIIDT DIST.
~
i TO.
Mr. Karl Kniel FROM:
Florida Power
& Light Company Miami, Florida Robert ED Uhrig OATS OF OOCUMENT 12/06/77 OATS RECEIVED 12/12/77 LETTER ORIGINAL ClcoP Y QESCRIPTION ONOTORIZED
&SICLASS IF I E0 PROP INPUT FORM ENCI.OSU RE NUMBER OF COPIES RECEIVED Concerns the use of Kerite Insulated Cable for Sti Lucie Unit No 2 ~ ~ ~ ~ ~ ~ ~
(1-P)
(5-P)
PLANT NRK:
St ~ Lucie Unit No, 2
I
'JL 12/12/77 I
I ASSIGiVED AD:
LTR BRANCH CHIEF:
PROJECT K4VAGER:
C S 'R FOR ACTION/INFORMATION IRC PDR LAINAS IPPOLITO INTERNAL0 ISTR IBUTION ICE P.
COLLINS FOUSTON HELTEiiES CASE LTR)
NIPC LTR)
IQfIGHT LTR BOSNAK SEHWEIL PANLICKI ROSS LTR)
NOVAK ROSZTOCZY CHECK TEDESCO LTR BENAROYA LPDR:
TIC NSIC ACRS 16 CYS SFNT CATEG F.
ROSA GAIMILL 2 )
VOLLiIER (LTR)
BUNCH J.
COLLINS KREGER EXTERNAL0 ISTR IBUT)ON CONTROL NUMBER
~7$46000y
~
~
~
~
i P.N BOX 013100, MIAMI, FL 3310'I
.~i'I'g$ Q >
Q Ilg il
/8
/h a
'FLORIOA POWER & LIGHTCOMPANY
%i k
December 6,
1977 L-77-363 Mr. Karl Kniel, Chief Light, Water Reactors, Branch g2 Division of Project Management U.
S. Nuclear Regulatory Commission Washington, D.C.
20555
Dear Mr. Kniel:
l Dg AQ 11 Re:
Use of Kerite Insulated Cable for St. Lucie Unit No.
2 Docket No. 50-389 In Supplement No.
1 to the Safety Evaluation Report for St. Lucie Unit No. 2, your staff determined that the use of cross-linked polyethylene (CPLE) insulated cable identical to that of St.
Lucie Unit No.
1 was acceptable in the underground duct banks at
. St. Lucie 2.
The Unit 2 PSAR further states (Section 8.3.1.1.9) that use of any other insulating material will not be implemented without prior NRC staff approval.
Florida Power 6 Light Company proposes to improve on CLPE cable performance by using Kerite insulated cable for 600 V power and signal cables.
Kerite insulation maintains the dry/wet/alternately wet and dry properties of CLPE while offering greatly enhanced fire retardancy capabilities.
Current schedules call for the cable to be on-site by November 1978 with an ordering date of early summer 1978.
Bases for staff review and approval of the Kerite cable are contained in the attachment to this letter.
We request your approval of this cable and that you review the attachment as expeditiously as possible to support the above schedule.
We will be pleased to meet with your staff to discuss the matter further.
Very truly yours, Robert E. Uhrig Vice President REU/MV:ltm Attachment 773460007 cc:
Robert Lowenstein, Esq.
PEOPLE... SERVING PEOPLE
I 1
J
~
~
~
ATTACIIhIENT KERITI'. XNSULATI'.D'ABLE s
- l. 0 lhITI<ODuC.r.'%~i
,The Staff in Supplement f/1 t:o its Safet:y Evaluat;ion Report: at Section 8.3.1, datecl 3 Harch 1976, discusses the qualification program for Class XE c'able in ti>e underground duct banlc syst: em. This program demonstrates t.he suitability of cable fox'peration in a vet, dry, and alt:ernat:ely vet and dry,environment:.
Subsequent guidance on cable insulati.on properties has been provided by the Staff: in RG's 1.120 and 3.131.
These. RG's indi.cat:e that cable in.,ulations shoulcl" comply with the fire retardancy requirement:s of XEEE-383-197f'>.
To be responsive to tl>e Staff "s most recc:nt guidance on cable insulation an evaluation vas conducted-to determine if a single cable insulation can provide suitable fZze retardancy and vet/dzy/a3.t:ernatety wet and dry properLies.
The results indicate thaL Keziie cables can accept:ably accomnoclate both requirements.
Accordingly Kezite insulat.ed cable, in lieu of cross-linlced polyethylene, wi31 be urilised for 600'Y poser and signal nable.
The base're provided infra.
2.0 HISIORICR1. HACRGROO."H)
In the 1860's the. compound I'crit:e vas developed, which resulted in the first: succc.ssfully deve3.ope<1 insulated wire i.n t:his country.
By 1868 at:
least 200 Keri.te cable
'i.nst tllations had been made in t:he United States,
- Canacla, Panama and Egypt..
3.n November.
- 1868, Dr.
S.
1.'foxse st:at:ecl with regard t:o Kerite cable. that "Xt appears to me that you have discovered t:he most perfect as yet of all insulating substances for submarine cable..." In 1869, I'@rite insu3ated cable v s installed under the Chicago River and by 1871 Kerite insu3aLed cab3,e vas furnishing submarine service for the rivers near'ev Yorlc Ci.ty.
A 1,000,000 circular mill Kezite insulat:ed power transmission submarine cable va.'.aid 'in the Govanus Canal in 1898.
Xn
'J.883 Kerit:e:insulated cables vere first installed on t:he New York City elevated railroads.
Insulation
.t:e t:s on cable removed from t:he 6th Avenue ei.evatecl structure after 50 years of service indicated no appreciable electrical <letezioration.
In 1908 Kerit:e insulated cable vas placed alongside the Panama Canal and
- in 1916 30 mi3,es of tlte cable were submerged i.n Gatun I alee upon. completion of the canal.
Part of: t:his cable vas still in service 60 years later having..urvived t:he sevexest condit::ions of the hot lxumid jungles of tI'>e tropics.
A railroad cable Itas been in continuous service for 70 years and t:wo underground cables in Chicago for around 80 years.
The Kerite Company developed and manufactured 16 nev Kerit:e insulated cable designs for the Hanhatt.an Project at Oak Ridge.
hIore than one million feet: of cable vere supplied and over ten thousand higlt-vo1tage connections made.
~,, ~
Kerite 'insulht;ed cable has a 100 years plus history,'of providing reliable service in all types of environmental conditions.
'A'consistent outstanding performance of t:he insulation is assured by the Kerite Company's quality assurance crit.eria.
Hhenever a new ingredient is added to Kerite to achieve an itnprovement in insulation performance, the insulaLion is subjected to a qualification test program.
Xnsulation performance must b
equal t:o or. exceed the relevant performance in all respect:s of the original Kcritc.
High te)nperttture Kerite was introduced 10 t:o 12 years ago and fire ret:ardant Kerite about 9 years ago.
These cables retain the important properties of Kerite while achieving the ability to comply with XEEE-383 fire retardancy requirements.
Power, single and multi-conduct. or cont:rol cables all pass the XEPI'.-383 ribbon burner t:est.
'IIistory to date indicates t:hat: Kerite insulated cable has demonstrat:ed thro,"; h con.,iderable in situ experience its abil;ity to accommodate all typ.
- m~ironmental conditions and has demonstrated its fire retardancy ca!>>"..'y passing the XEI',H-383 t
- est.
Specific test data relating to fir:-
.Iancy and wet/dry/alternately wet: and dry conditions. are prov:. , 'low.
- 3. 0 gfJAI,lPXCATXON TESTS Tests were run to insure that the current Kerite formulations are equivalent to the prior, Kerit:e in a, wet environment.
Xn addition, cyclic.wet: and dry.test:s were run t:o compare these insulation formulations in a cyclic wct%lry environment.
Xn all cases, the current formulation erceedee Xl:).'E-383-1974 REMA 4'C-3, or ASTII D-2633 fire the current Keritc formulation capabiliL'y, the XEEE-383-197>>'i ribbon burlap bag test, and the IPCEA S-19-81, re.,isting t:ests were run.
Cables using successfully passed t;hese tests.
/l I:
An 'evaluat.ion technique has been devel. oped by The Kerite Company to compare their current Kerite formulation t:o the prior I'crit:e insulation with it:s Lime-proven service record.
The data developed demonstrates the newer insulat:ion's superior water performance.
Alternate wet and dry cycling tests hav<. been performed which demonstraLe that alternately wet and dry cycling i" not as severe
'as continuously wet.
The ntonitoring to tlte effect of water on electrical properties showed the insulat;ion resistance was a useful paramet:er in terms of comparing the later cotnpoun<l with Kerite insulation.
The rate of change of insulation resist:ance, rat:hcr than the absolute value of insulat:ion resistance, is used.
0
'iihving identified the relevant aging factors to be time and water temperatures, the relationship between materials was selectecl to be. based on the time to reach one-half of the original in. ulation resistance level.
Other levels or paramet:ers could ltave been selected;
- howevex, the 1/2 IR point was sometlting achievable in reasonable
.time periods and represent:at:ive of actual cable performance paxameters.
(It must be not:ed that achieving t.he 1/2 IR point: <loes not constitute loss of cable function, it is mc,rely a convenient test parameter, commonly used for this type of comparative t:es ting. )
The tests were performed with the outer jacket of the cable removed in order.
to eliminat:e i,ts positive influence on t:he results:
In actual service the cable jacket wi13. aid in t:he cable's overall water performance.
As st:atecl pxevious3y the current Kerite insulation was compared to Kerit:e, which ltas had an ertencled service hist:ory encompassing in excess of 100 millions of feet of many construction types in all environments, i.ncluding wet:, dxy, and alt:ernat:ely wet and dry.
The at:t:ached figure, "Comparison of 1'rior Kexite InsulaLion with the Newer. Kerite 3n ulation in 4'ater," demonstrat:es conclusively that the newer Kexitc: insulations for power as well as signal cables axc.. far superior to the pr..ior Kerite.
The results shown on this figure are very conservative when one considers that: the insulation thi.ckness tested on t:he prior Kerit:e cab3.e was 78 mil, while t:hat of the newer formulation.
was'nly 50 mi]s.
Tn addit:ion, to further. den>onstrate that the alternate wet: and dry condition is not a limiting condition, but is bounded by wet and dry performance, 3-1/2 day cycle tests were concluctcd.
The acce3,crated test consisted on one sample of cable being placed cont:inuously in 90'C
- water, ancl another sample cycled 3-1/2 days i.n 90 C water, followed by 3-1/2 days in room t:cmpexature air (approvimately 22'C).
Once again, the time it tool< '2'or the cable to reach 1/2 of its insulation resistance was used as a basi.s for. comparison.
The results were that for a 30 mil thicl<ness of insulation, the sample continuously i.n wat:er t:ook tlrirty <lays to xeach 1/2 IR, while t:he cyc3.ed cable took 58 days to reach 1/2 1R for. the signal cable insulat:ion.
Prom the above Lests and field experience, i.t can be concl<ided that the 600 volt: power an<1
. ignal cables purchased for St'.. 3.ucie 2 will perform the'ir function in wet, dry, and alternat:ely wet and dxy conditions, and that cyclic conditions are less demanding on the insulatiotx than the continuously weL condition.
3.2 I'ice Rerar~d:.na Kerite cable meets the vert:ical tray flame test requirements of IEEH 383-197~> for single and multiple conductox cable.
~
l 1
~
~
Tgst sample.. similar in construction to that to be used on St:. Lucio Unit 2 vere installed in a 12-inch wide, 3-inch deep, ll-foot high 3adder tray and exposed t:o a flame source of 1500'P placed three inches away from the test samples in accordance with IEEE 383-1974, paragraph 2.5.4.4.
At: the encl of twenty minutes, the flame souxce was shut off and the cable vas allowed to burn until it self-extinguished Temperatures vere measured by a thermocouple located 2-7/8" from the burner face.
'l'he t;est va" repeated t:hree times for reproducibility.
Test samples that: did not; se3.f-extinguish after removal of the flame source wexe a3,loved to cont:inue to burn to determine the extent that the sample burned.
Test: xesults for. all
<ged and unaged cable samp3es demonstrate that a13.
test sample vere damaged to a height less t:han 8 feet, as required by IREE 383-1974, Paragraph 2.5.4.2 and Paragraph 2.5.5.
i h single unjaclceted conductor fxom the si.gnal cable were flame-tested to clemonstrate the ability of the insulation to meet the flame-zesisting test of IPCEA 8-19-81.
Te. t results indicated no burning of the flame indi.cator.,
approximat:e3y four inches of the insulation was consumed at the point: of flam( impingement: with an additional one inch of charred insulation at: each end and t;here vas no persistence of flaming after removal of t:he burner flame.
There was no propagation of the flame.
Flame test:s on cab3.e werc also conducted, using a 24" x 24" x 9 oz.
commex'cia3. grade burlap saturated vi.th t:ransformex oil as a fixe source.
The burlap va. folded:in accordance with l.'iguxe 2 of IBHE 383-1974 and immersed in a container. of transformer oi.l for five minutes.
Xt vas allovecl t:o drain in free air. until the veight: of the oil retained vas 1GO + 5 grams.
It vas tlten fastened in place approximately t vo feet from the bott;om of the tray and ignited.
The cable shoved new evidence of propagating a fire, i'rom t:he area of t:he source.
Conclusion Based on the long st;anding tests of current:
and prior inclustry fire tests, i.t: is strikes an optimum balance dry properti.es.
perfoxmance of Kerite insulated ca'hie, compaxat:lve I'.exite formu3.ati.ons and the ability to pass concluded that the current: 14exite ioxmulation betveen fire and vet/dxy/alternately vet and
(.'O.'Ii'ARI,SON OlRlOR kl Ri.'I'}
INSVJ,A'I'lON Ls'fTII Till'. ',R Kl'.RXXI'. 7NSUI,AT7OYS 7N h~ATE.
100, 090-10,000 1,000 "v
~C>
10 J
220 290 180 160 1~~0 120 100
<'>ATER TEHPERATURE
~C (1/ K) 80 60
e k
R<<~iv.n oocur<ci<r
" '"I',lG U~~lr
.9'f/ fiEC 9 oq z i l
U