ML20106G427
| ML20106G427 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 06/14/1982 |
| From: | Chandler M BROWN & ROOT, INC. (SUBS. OF HALLIBURTON CO.) |
| To: | |
| Shared Package | |
| ML20106G425 | List: |
| References | |
| NUDOCS 8410310198 | |
| Download: ML20106G427 (3) | |
Text
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-m of sovaral faults in the electrical phase of construction at Comanche Pmk cs of January 11, 1980. Having been employed as a journey: an electricize b;r Bron & Root, Inc. dtring the latter pa-t of-1979 until January 11, 1980 t,t Counchs Peak, I verked in the electrical
- termination crew
- doing the actaal phyricd tvrmination of the viring and later on the "checkoat crey".
his latter crew checks the viring done by t% ternination crew as to c.ocaracy and proper terriioation technique.
1 uas regaired to turr, in a written and sigr.cd report on each cable checkei by me.
So ne, if not all or these faults can be verifiec snd located through these reports.
'e bese faults include luproper lug sising and actual physical alteration of lugs, splicing cf ci,als, patchinC of dancoc cables, improper pin setting on " canon" type plugs, fculty grounding, viring not properly protected-froa abrasion, wire tonsins tr>c high, and imprcper protection of cables curing thermal welding.
Luce are a viring device thct attach te the encs of viree or ceblos nz en aid to terrtination and come in a variety or etyles and sizes. The "rin.
type" used at Courche Peak has a hole in its tongue to accept screws frca terminal blockr.. These bolos can be of varying size dependent upon what diaceter or stud site ecrew the terminal block is engineered for. A etud size six is smaller in dinneter in both the threaded portioc and the i4 :f the screw than a stud site 8 or 10.
Th t. lu.:s for theat, it order to fit the iiifferent torr.inal blockr anc' screw r,i.ze ant-at ti.e rame tim maintaia the superage canacity they ar e rated for, are nanuf actured with a different sL. ped tongus.
For example, #12 copper wire has an rnpera ;e rating of 20 r ps, en:1 a lug designed to accept the vire nust have the rane or larger t.mpacity. The rating of the wire is determined by the diameter of the copper conductor. The rating of a lug is determined by the size a!d shape of the tongua. It amst have a specific arts of its surface in cont act with the terminal block or its a:qmcity will be leesened.
A lug..ith its tongue designed f or a p10 scrow has a hole in its tonice ihat is larrcr than the hole in one deeigned for a f6 or pS sorev. The toccue is also vider and thinner.
If a lur designed for a fl0 screw is useJ on a terminal clock designed f or uns with #6 screws, its creacity is leesoned becaupe a $b ecrev having a smaller head eir,e only applies peasaure to tbo inner ring of the lu; tongue causin; a " belling" effect. It cassas the outor odges of the tongue to curl outward, also less area under the screw head is in contact with the terninal L.wck because of its la.rger hole. There ete m.any instances vtare this :ms happened at Corurebe Peak. Sate of theos are s 1.
krriliary Dailding Reactor 41---14 desi rned for r.n approximats screw aise of 3/8" var used on a terninal block assigned for fl0 acreva. Thin tras demo with the aid of a steel vasher with at the uso of contact aid to provost ales-tro]psis between tbo two dissimilar metals.
8410310198 841123 PDR ADOCK 05000445 d
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Several lucs designed for 1/h* screws were need cc t.
Switchcoar Roca.
terminal blocks denigr.ed for /D nerovs.
Thm two instances stand out in z.y nind but there are many nore in partinniar cancerning W circulating wate'r systen a::d fire control; h verar, hoverer without reforeco natorials I cannot be note epocific.
thers in et los.st mra lastatoo I can recall-in fact for which I r.a at locat pertially re.rpcanible.
This is the terninntica af a 1c40 rc cabla that was drilled to accept the larger cable with the uso c( a 750 liCH lu It was cono after prctest by both myself and Dennis Noaves, enohr nin2.
Drilling W 14 jenrnnyms ucrking as ry partner on W teraination crew.one, it reduced the c.acntut c c.ffectr4 its c:prcity in two nannsrs:
to ceAet als,etricity and it was a bolt typs nochanien1 lu, re,ing that h lug v..a oscursd to W er.blo by moans of a bolt or not screw in its body.
the lug body had the offect of lessening the nunber of threvis to Dr4114 7 wt nora Wu three or to:4r for the set screw to be screwed into. This uns in J.ny f ailr-m in tho n Hoter Ccatrol Centor in the Circrd.ating Water systec.
circult. ting vater nystm rhich providca coolant water for the reretor could
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posuibly cause nry pericas problema.At locat was cabla in W Annunciater Logic P roer. for Eccetor il vre apliced in the annunciator pr.nal itoolf and conrcd one with ohr viros to hida it frca sight. The cable va.s too large (it n>s asim:d) to terninnte on W fwse block to uhich it itu dasignated.
cable turninntc.d to the Upon crrtizatica of W fue block I fourri th-Es.d it bsen terrinated on the correct air.e tb
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rarcag side.cf it.
ombLs tuuld havo fit. The aplice was made on the orders of Frank Platt, the Gamen1 Toruna.n over t1rnination.
also in tbs Annunciatcr panels thces in which the rins vere not seated prcp cly.
ware savaral " Canon" typa p1vga This e-n cause the connector pins to be pushec back into the bocy of the The innunciater Logic plug c asing the pin or pins to have :.cor contact. 1 functions.
My nalfunctic.4 Pasale gin W alarn if any part of the syster. r:
in the annunciater systca can cauco no alarn to be given in any caargency to subjaot.
which W plan. nay w
Pertions of the grounding syntam for the cable trays ic the Spreader Eoon vers darsgod either by an caployee collecting copper or deliberato The conductors Stra.sde vero cut from the ca.bles in several placas.
vendalina.
tare nuver cut entirely in two but the removal of a strand of no astter what langth reduces the capacity of the conductor.
In the Contrcl Center f or Reactor #1 literally hundrecs and possibly thouands of vires were brought out of their metal raceway anc pulled aharply cnrar their ehrrp, unprotected oceae, naking ths= particularly ninerable to abreaica and vibration. Evary portion of overy system in the plant could bo.rdenrcoly c.ffocted by thio f anity procedur=.
At least ena cable in the Svitchtsar Room was danaged while being Itc insulation was nicked in coveral places and patched with heat pulled.
shrink tubing instoed of baing replacard.
In at least two inats.nor.,a wirna or caules vore too short by only a Nee vare pulled very tightly nettor of inches for propar termination.
Tb47 nec palled tight enough that thora is tM possibilly nnd toraincted.
of thir being pullod from their lu.,s.
One of those in in tbo Sp.* Rocn; wahr is in a lbtcr Ccutrol Center in tha Circulating 4ter Systen.
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" Cad welding" or ther ia'l. t.) 'in.
of _.1.:,e_ ;routdin. con uc t.orr - on '
the cable trayr-vas done after nany cables hac alresdy oee. ;ralled.
through them. f T coale not ' inspect ;ror ca:r.oge, out the only protection'-
used on tha cables war e.n anbestos blanket that,arotected only t:.e cables in tne inaudiate vicinity or the.seld.
I ars necessari.Ly vague on whien ;artic' alar cabinet or panel or.
even systen te which 'I refer dae to tirmo elep;:ad an. the.-large nanber of systans on which I workec. dith refereace naterial:. the location of these-faulte could oe raach. core closely identified a= could others not centionec specifically herein.
N Signerd this
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day of Jano'1962 afjg g yp.g g g g.
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i13chael Chandler.
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