ML20062L741
| ML20062L741 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 02/13/1981 |
| From: | Anderson O, Jackie Cook, Curtis L BECHTEL GROUP, INC., BECHTEL POWER CORP., CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 11190, 81-01-#1, 81-1-#1, 81-1-1, MCAR-46, NUDOCS 8102180623 | |
| Download: ML20062L741 (24) | |
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Vice PressJent - Projects, Engsneenng and Construction oeneral Offices: 1945 West Parnali Road, Jackson. MI 49201 * (517) 788-0453 81-01 #1 February 13, 1981 Mr J G Keppler, Regional Director 9
US Nuclear Regulatory Co::: mission S
Region III Q
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799 Roosevelt Road g
17 Glen Ellyn, IL 60137
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MIDLAND PROJECT -
%/W DOCKET NOS 50-329, 50-330
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UNDERRATED TERMINAL STRIPS CH LIMITORQUE VALVE OPERATORS
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FILE:
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73*10*01, 40*10 SERIAL:
11190 This letter confirms the 50.55(e) item concerning the teminal strip voltage ratings on Limitorque valve operators. This was reported by telephone call to R Sutphin and R Knop of USURC Region III, Glen Ellyn, IL, on January lb, 1981. provides a description of the condition and the planned corrective action.
Another report, either interim or final, vill be sent on or before April 2h, 1981.
L w W &sf WRB/lr
Enclosure:
(1) MCAR-h6, Interi= Report #1 (February 5,1981) - Underrated Terminal Strips on Limitorque Valve Operators CC: Directcr of Office of Inspection & Enforcement Att Mr Victor Stello, USURC (15)
Director, Office of Management Information & Program Control, USNRC (1)
RCook, USNRC Resident Inspector Midland Nuclear Plant (1) 8.t 02188 (tJ3
.. g Serial 11190 1-l 1
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CC:
CBechhoefer, ASLB Panle GALinenberger, ASLB Panel f
.FPCowan, ASLB Panel -
AS&L Appeal Panel.
I M4 Cherry, Esq MSinclair l
CRStephens, USNRC i
. WDPaton, Esq, USNRC I
FJKelly, Esq, Attorney General t
3 ShTreeman, Esq, Asst Attorney General GTTaylor, Esq, Asst Attorney General j
WHMarshall l
GJMerritt, Esq, TNK&J
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l Serial 11190 Bechtel Associates Professional Corporation i
SUBJECT:
MCAR 46 (issued 1/15/81)
Underrated Terminal Strips on Limitorque Valve Operators INTERIM REPORT 1 DATE:
February 5,1981 PROJECT:
Consumers Power Company Midland Plant Units 1 and 2 Bechtel Job 7220 Introduction Description of Deficiency In the process of ordering a replacement for a cracked terminal block, Bechtel determined that some terminal blocks in Limitorque valve cpera-tors may have been underrated for their intended function. The manuf ac-turer's name is the only identification on the terminal blocks; thus, they were measured and compared with terminal blocks listed in Marathon Catalog 10M79. This comparison led to the suspicion that the terminal blocks used for the termination of the leads from the valve operator 460-volt motor were rated less than 460 V.
Eighteen Limitorque operators on Bechtel P.O. 7220-M-132-AC were inspected 1
and eight had underrated tenminal blocks. The subject P.O. is with Henry Pratt Company for the supply of nuclear service butterfly valves.
Potential Safety Implications Seven of the eight valve operators having underrated terminal blocks are located in the component cooling water and service water systems and are used on safe ty-related valves. These must function on an emergency core cooling actuation signal. The potential exists for a short circuit /flashover which could render the valves inoperative.
Inve s tiga tion Investigation by Bechtel revealed that 8 of the 18 Limitorque operators have Marathon Series 100, Cinch Jones Series 140, or Beau Products temminal blocks having similar dimensions which are underrated for 460 V se rvice. The other 10 operators inspected had Marathon Series 300 blocks which were initially rated by Marathon for 600-Volt service and 4
have subsequently been derated to 300 volts by Marathon in their catalog 10M79. Representatives f rom Limitorque (J. Arnold) and Henry Pratt i
(B. Cummin's) visited the Midland jobsite on January 13, 1981; after inspecting the terminal blocks, they confirmed the results of Bechtel's inves tiga tion.
i l
Bechtel Associates Professional Corporation f
MCAR 46 Interim Report 1 i
Page 2 f
Limitorque, in its letter of January 21, 1981, (Attachment 1), has explained the circumstances which led to this derating of the Marathon Series 300 terminal blocks. Limitorque's states that the Marathon 4
300 Series terminal blocks are suitable for 600-volt service based on a manufacturer's test for 600-volt service (using a line-to-line breakdown voltage of 9,000 volts and a line-to ground breakdown voltage of 11,200 volts.) Bechtel is further investigating Limitorque's statement.
In Attachment 2, Limitorque states that they do not stock Marathon 100 series terminal blocks. However, Limitorque believes that when their field service engineer visited the Midland jobsite in November 1977 to modify the terminal blocks in 66 operators (on the Henry Pratt or-der), he may have procured the subject terminal blocks locally. The Limitorque letter further explaine that an additional 20 terminal blocks (140 series) manufactured by Cinch Jones were shipped to Midland. These blocks are equivalent to harathon Series 100 blocks and may have been used to terminate the 460-volt motor leads by the Limitorque service engineer. The source of terminal blocks manufactured by Beau Products has not been determined. Seventy-one operators have been purchased on P.O. 7220-M-132-AC.
Corrective Action 1.
Check all operators on P. O. 7220-M-132-AC and replace underrated terminal blocks.
2.
Contact all suppliers of the Limitorque operators for all valve orders by February 16, 1981. Advise suppliers of the identified problem and request an evaluation of the correct rating of their terminal blocks. All suppliers will be reminded of their 10 CFR 21 commitment responsibility.
3.
Develop a limited inspection program for other orders. If underrated blocks are then found, check all Limitorque operators for underrated terminal blocks and replace all underrated terminal blocks.
Reportability Based on the potential safety concerns, this item was considered report-able. This deficiency was reported by Consumers Power Company on January 14, 1981, to R. Sutfin, R. Cook, and R. Knop of the Office of Inspection and Enforcement, Region III, U.S. Nuclear Regulatory Commis-sion, as a reportable deficiency for !!idland Plant Units 1 and 2 in accordance with 10 CFR 50.55e.
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Bechtel Associates Professional Corporation 021508 MCAR 46 Interim Report 1 Page 3 Forecast Data for Investigation and corrective Action The next interim report is scheduled for April 10, 1981.
Attachments:
1.
Letter, Limitorque to Henry Pratt, 1/21/81 2.
Letter, Limitorque to Henry Pratt, 1/21 81 Submitted by:
W Approved by: 6S r.
i a e.n,,
Concurrence by
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LIMITORQUE CORPORATION g.4 5114 Woodall Road P. O. Box 11318 Lynchburg, Virginia 24506
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Telephone-804-528-4400 Telex-82-9448 A'TTAC H - L January 21, 1981 Henry Pratt Company 401 South Highland Avenue Aurora, IL 60507 l
Attention: Mr. K. Wilson l
Gentlemen:
Subject:
Marathon 300 Terminal Strips Lir.itorque has successfully used the Marathon 300 series teminal blocks for 600 volt service for over 10 years. These teminal strips were originally rated for 600 volt service based upon the breakdown voltage. Attached is a copy of a Marathon catalog cut dated July 15, 1974, which shows the Marathon 300 series rated at 600 volts.
Approximately 2 years ago, Marathon completed an Underwriter's Laboratory approval on the Marathon 300 series terminal strips.
The Underwriter's Laboratory approval specified that the terminal strip was to be rated based upon dimensional requirements and not on breakdown voltage. The 300 series teminal block dimensionally meets the Underwriter's Laboratory specifications for a 300 volt rating. Enclosed is a copy from a 1979 Marathon catalog which shows that presently this terminal strip carries a UL rating of 300 volts.
We have also attached an article from the April 7,1977, issue of Machine Design that explains the differences in rating methods.
Please note this article states that most manufacturers rate teminal strips at 1/3 of the breakdown voltage. A copy of a Marathon teminal strip rating sheet is attached which shows the actual breakdown voltage for the 300 series block. The line to line break-down voltage is 9,000 volts and the line to ground breakdown voltage AutorTwted Valve Oper etor s and Jacks for Industr y
1*
l-UMITORQUE CORPORATION Sheet No. 2 Mr. K. Wilsen 0 2 l 5 0 9)anuary 21, usi l
1s 11.200 volts. These actual breakdown voltages are at least l
15 times the 600 volt rating used by Marathon prior to the UL approval.
It is Limitorque's position based upon past experience and the actual breakdown voltages that the Marathon 300 series terminal strip is suitable for 600 volt service.
Please contact me if we can be of further assistance.
Very truly yours, LIMITORQUE CORPORATION d) d 3 W Daniel S. Warsing Technical Manager jhb Attachments cc:
F. K. Denham P. G. McQuillan Vajay Shah /Bechtel Power Corp.
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l MEDIUM DUTY TERMlftAL Bl.OCKS
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TERMINAL BLOCKS '.
PRICE LIST SECTION:
9110 100,200,300 AND 400 SERIES -STANDARD SCREW TERMINAL PAGE:
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SUPERSEDES
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JANUARY 3, h.j 4
DATE:
ph SE R1ES 100 - 15 A.150V S4 RIES 290 - 20A 300V SERIES 300 - 30A,800V SERIES 400 - 55A,000V No.Of Part Lbs.
- List Part Lbs.
- List Part Lbs.
- List fart Lbs.
- Oa Term.
No.
C pcs.
Each No.
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S.44 0301081 6
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36 0136081 16 5 73 STANDARD SCREWS AR E NICKEL PLATED STEAL. BINDER HE AD STYLE. CLASS 2 THREADS.
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BR ASS BINDER HEAD SCREWS ARE AVAILABLE ON. REQUEST. SUBSTITUTE 001 FOR 081 IN THE LAST THREE D108T5 ON THE PART NO.*SCR 100 AND 200 SERIES. ADO S.02 PER LINE TO THE LIST PRICE A80VE. FOR 300 AND 400jEBIES. ADD S.04 PER LINE TO THE LIST PRICES ABOVE.
I LIST PRICES SUBJECT TO STANDARD DISCOUNTS.
PRICES SUBJECT TO CH ANGE WITHOUT NOTICE.
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zhfewBULLETIN 4.4 MARATHON
@ special products 021509 300 Series e nef e,,o Eviletin 4.0 for i
Terminol strr, TERMINAL BLOCK - DOUBLE ROW Rotings and Standards.
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4 300 VOLTS 30 AMPS
- 1-24 TERMINALS 1
GENERALINFORfAATION APPtlCATION CON 5TRUCTION l
Designed for electrical and electronic termirkstion of wire.
Terminois - Sross. teckel pkited with or wnthout use of a termino 1 connection. for low volto9e so,e
_ General purpose phonolic and omperoge requirements.
,,,ed 150*C closed back Screws
-8 32 tinder head j
ELECTRICAL RATING I
,100 Volt *
-30 Amps
- STANDARDS
-Will accommodate lugs for wire sizes AWG #16 to #10 U.L. Recognized F'le No. E62906 i
-9/16" Centers C.S.A. Certified File No.19766 j
F CATALOG NUMBER 7
NO. OF CAT.
NO.OF CAT.
NO. OF CAT.
i f f tM.
NO.
TERM.
NO.
TERM.
No.
1 301 10 310 19 319 2
302 11 311 20 320 3
303 12 312 21 321 4
304 13 313 22 322 3
305 14 314 23 323 306 15 315 24 324 7
307 14 316 l
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3 300 17 317 l
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STANDARD MODIFICATIONS DEFINITIONS
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FI F2 F3 5
HS HFI HF2 HF3 L
LWW SP SPSE i
All 300 series standard modifications will take o.250" fast-on Fl = Full quick connect (0* flot)
H5 =Holf solder (one side)
L
= Feed thru solder connector F2 = Full eu ck connect (45* bend)
HFl = Half quick connect (0* flat)
LWW= Feed thru wire wrop F3= Full qu ck connect (90* bend)
HF2= Holf quick connect (45* bend)
SP = Sems pressure soddle screw 5 = Full solder (both sides)
HF3= Half quick connect (90* bend)
(8-32 steel. nickel plated) i
$PSE = Sems pressure soddle screw I
with outernal tooth lock washer (8-32 steel. nickel plated) j ORDERING CODE F., wie.ith medaicatie,,s.
s.. abe,. ced. 4,pis.: t.
se,ie,_3eo some medaicetiens sii lines.
Combination of modifications.
No. of Terminels censult factory.
(
Typical Cat. Number: Stenderd.313 Stenderd Meditied.313.F3 j
MARATHON SPECIAL PRODUCTS DIVISION OF MARATHON ELECTRIC U
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'W N'Nd I' O sOwtisocaf(N.OHa0 43402 I I bll I M IIII N IIIId h'IIN O v v -. u v a ua o ua m
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Makina sense out of "reco"nized standard for deter-S i= "a a"* 8 "atia"*"r a
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021509 rnining terminal block voltage ahd current ratingsI Because TERMINAL inanyTerminal block manufac-turers use their own methods, l
BLOCK RATINGS theuserisoftenfacedw i
, a e g - - >i, iden example, most terminal block Terminal blocks are perhaps the simplest devices in manufacturers base operating-gs on one 0r o
an electrical circuit. Yet, selection is often difficult
,"rit im bre, wn, 9tg,
because of nonstandardized rating methods. Here's tests er terminal spacing. But how various manufacturers rate their blocks and operating-voltage raungs based what the ratings really mean.
on breakdown-voltage tests l
may be two to three times i'
higher than those based on ter-russell J. VAN DER ELsEN minal spacing. Current ratings Curtis industries Inc.
are equally difficult to assess
{
Milwaukee, wis.
because in many cases they are i
based on inconclusive data and 1emperature ratings of wire in-i sulation types now seldom used in industry. Thus, competitsve l
Int <. ands of termonal bl0Ch tyoss are made by over 35 manufaugurers do often assrgn wrCefy differung ratsngs t0 Vortually l
rdentrCal bl0Cks. Io effectively Compare and select the devrCes.
you must know how the voltage and Current ratungs were determined L.I 3
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" termin:1 block d tn m:y not b2 directly comparable.
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g Agincies such as Underwrit-T Crs Laboratories (UL) and the Creepnge and clearance are terminal block distances used by UL and NEMA to N tional Electrical Manufac-determine voltage ratings. cr'aepage is between-terminai and turers Association (NEMA) are terrnnal-to-ground spacirq measured along the surface of the irautation This cttempting to standardize ter-
"h*******'"**"""Y"""'"8'h**"****^***"'
durmg breakdown Clearance as the shortest through-air distance between min:1 block rstings. For exam-
,,,n,n,,,,na,,,, t,,n,n,,no ground. ounng bresadown. inis current path pl7, NEMA Standard IS 41968 is she arternst,,e,o inar oorsned by creepage.
is beidupMted to agree with tfi3 voltage rating'sji,i_s U,L Stan'd-
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ard 1059.
Creepage Clearance Op:rcting Voltage
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A terminal block voltage rat-ingindicates how much voltage 4 t'Q.? i 2'm 1
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n:Is without danger Yd$MC0 I Nt'A T
ever (arcing betwee.
an-nsis). Most terminal block m nufacturers establish volt-cge retings according to ei$her breakdown voltage or terminal spacing; hi-pot raethod of determining UL does not presently accept Breakdown voltage of the operating voltage rating is the this method of determining terminal block is determined by hi-pot test itself. An: accurate terminal biock voltage rating, c hi-pot thigh. potential) test in high-voltage source is another good indication of g
which the voltage difference be-required-usually 5,000 to hi pot testing is the absence of twr.en adjacent terrrinals is in-10,000 Vrms-and test c mdi.
any mention of UL recognition creisrd until current flashes tions such as moisture, surface in advertising or product litera-betwnn terininals or between a contamination, and air quality ture. To be sure, however, con-terminal and ground. The must be carefuhy control:ed to tact the manufacturer. A ter-cperating voltage rating is then obtain repeatable results. But minal block may be recognized cctab!ished as a fraction of the even with carefully controlled but may only meet spacing re-brz kdown voltage. Moat man-test conditions the resultant quirements for specific applica-ufreturers use one third break-rated voltage is for a specific set tions.
down poten'tial as the of environmental conditions The terminal-spacing method cpirating-voltage rating for that cannot be controlled in ap-of determining terminal block blocks rated below 600 Vrms.
plication. However, many operating voltage ratings is The origin of this practice is not manufacturers continue to use based on distance measurement known for certain. However, it this rating method because it rather than e hi-pot test. The mty have started with the UL usually yields a higher operat.
rating depends on two mea-cnd NEC (M.utional Electrical ing voltage rating than other surements (creepage and clear-Code > requiresner.t that electri- -
methods.
ance) that represent paths that c:1 equipment withstand a hi-If the test method is not given flash-over current follows dur-pot trst of twice the rated voit-in a manufacturer's catalog, ing breakdown between adja-cge plus 1,000 Vrms for 1 inin.
there are two ways to determine cent terminals, or between ter.
Thus, a 1,000-Vrms ter ninal which method was used. If the minals and ground. Crr:epage is block can withst.md up to 3.000 operating voltage rating of one the distance along the surface of Vrms without breakdown brand of terminal block is near the insulating material, and under test conditions. For one third breakdown voltage clearance is the distance blocks rated between 601 ar4 and. at the same time,is unusu.
through the air as measured 5,000 Vrms, NL.dA Standard.
ally higher than the rating of a from terminal to terminal or ICS.1970 requires a hi-pot test competitive terminal block, from terminal to ground.
er 2% tir.es rated voltage more than likely the operating UL tables conelate creepage plus 2 000 Vrms.
voltage rating has been deter-and clearance distances within The major weakness of the mined from hi pot testing.Since terminal block operating 3olt-uwme estcu 8s N
021509
, s,.) -
5 t
cg:s f:r UL r:ctgniticn. UL comir.gincr:asingly significant with:ut cxceeding a tempers-Standard 1059 categorizes ter-in industrial equipment.
ture rise of 30' C. Current rat-minal blocks in three general At first glance, the ditTerence ings for wires are based on NEC aress according tointended use:
in rating methods may seem tables 310-16 and 310-18. Un-Class A for service equipment immaterial. In reality, the re-fortunately, terminal-block such as switch boards and panel sults are significantly different.
manufacturers' current ratings boards, Class B for commercial For example, one manufacturer have been based on 60* C insu-appliances such as business may rate his block at one third lation ratings. Thus, the cur-equipment and data processing breakdown voltage, or 1,000 rent ratings shown in many equipment and Class C for gen-Vrms, indicating the unit with-cataloge do not accurately indi.
eral industrial applications.
stood a hi pot test of 3,000 cate the true current capacity of Within each category, tsrmi-Vrms. Another manufacturer, the terminal block.
rr.1 blocks are rated sceording using the terminal spacing Accordingly, many terminal to creepage and clearance dis-method, rates anidenticalblock block manufacturers have re-tances. For example, a terminal at 300 Vrms, but specifies a moved current ratings from block rated at 240 Vrms has breakdown voltage of 5,500 their published data and refer clearance and creepage require-Vrms. If the second manufac.
only to the wire range and the ments of % in. and 1% in. re-turer follows the breakdown appropriate NEC tables. The spectively, for use in service voltage method, he could rate only limiting factor here is that equipment (Class A); 3/32 and his block at 2,250 Vrms. Thus, the temperature rating of the 3/32 in. for use in a commercial the msnufacturer using one-conductor should not exceed the appliance (Class B); and % and third breakdown voltage as the temperature rating of the ter-
% in. for use in a general indus-sole basis for voltage ratings minal block insulating mate-trial application (Class C).
may be rating his block two or rial. Otherwise, the terminal Because of the commercial three times higher than the block molding might melt at significance of UL recognition, manufacturer using the termi.
elevated temperatures. Ther-the terminal spacing method is nal spacing method.
moplastics used in terminal being used increasingly by blocks are generally rated at90*
~. manufacturers. Moreover, UL Operating Current C or greater and thermoset requires that to minalblocks be material is rated at 150* C or UL recognized in UL listed According to the revised greater. Since most wires used equipment. Because some met-NEMA Standard IS 41976, ter-in industry are rated 90* C or repolitan areas require the use minal blocks should be able to
.less, there is little chance of of UL-listed equipment, the im-carry as much current as the terminal-block melting under portance of uL recognition is be-wires they are designed for normal service.
Usually, terminal blocks can be selected solely on the basis of voltage and current ratings.
However, so:ne specialized ap-Terminal blocks used in UL. listed equipinent must be recognized in ation of other characteristics.
I accordance with the Safety Standard UL 1059. Tnis standard categorizes terminal blocks in Class A. B, or C according to tneir intended use and terminal e Sufficient mechanical spacing UL. recognition cf terminal blocks is becoming increasingly strength to withstand stress or important because of tne commercial sign.ficance et ut sistmg.
vibration.
P e Flame retardancy of the O "* ""8 V*3'*8' T*'*'"*l bPacang, sn.
insulation for most any applica-Terminal Blocis Class Rating. Vrms Clearance Creepage tion (UL requires a rating of A. Service Equipment idead.
51 to 125 1/2 3/4 94y.1 or better).
front switchboards. panel.
126 to 250 3/4 1%
I
- High dimensional stability boards. etc.i 251 to 600 1
2 B. Commercial Appliances 51 to 125 1/16 1/16 for close tolerance applicaticns (business equipment. elec.
126 to 250 3/32 3/32 where wide variations in tem-tronic data.processin,g 251 to 600 3/8 1/2 perature and humidity may l
equipment...e.'
cause physical distortion.
C. General Indwtrial (power 51 to 150 1/8 1/4
- H ghdielectricstrengthfor distribution. signal rout.
151 to 300 1/4 3/8 low-current applications where ing. etc.
301 to 600 3/8 1/2 current leakage must be minimized.
C l
A m t 7.'s77 85 I
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LIMITORQUE CORPORATION 5114 Woodait Road + P. O. Box 11318 Lynchburg. Virginia 24506 021509 T*Ph a*-8o4 5 8-ddo T*;**-82-9448 ATTA C H. - 2.
January 21, 1981 l
Henry Pratt Company 401 South Highland Avenue Aurora, IL 60507 Attention: Mr. K. Wilson Gentlemen:
Subject:
Marathon 100 Series Terminal Strips In response to the recent report from the Bechtel personnel at the Midland Power Station site, we have researched our records and found that the equipment in question was modified by a Limitorque field service engineer in November of 1977. At this time, 66 sets of terminal strips were supplied by our factory in Lynchburg for a field service engineer to change terminal strips at the jobsite. According to our records, the proper voltage rated terminal strips were shipped at this time.
After the field service engineer arrived at the jobsite, he dis-covered that some of the teminal strips shipped had been damaged.
An additional 20 teminal strips were shipped from the 1,ynchburg plant. These were 140 series teminal strips manufactured by Cinch Jones which are dimensionally the same as Marathon 100 terminal strips. These strips were to be used only in the 120 volt control circuit and not for the power connection. The field service engineer 7
that performed the required teminal strip changes was a new employee and did not know at the time that the Cinch Jones teminal strips were not adequate to be used for power connections.
At my request, Mr. Gary Warner removed terminal strips from several operators and found that the terminal strip on one unit from Automated Valve Oper etof s and Jacks for Induscr y
UMITOROUE CORPORATION Sheet N 2
Mr. K. Wilson 021509 January 21, 1981 Limitorque Order 393688-A was a Cinch Jones 140 series terminal strip. In addition, on a unit furnished on Limitorque Order 3A2337-B, Mr. Warner found a terminal strip which appeared to be a Marathon 100. In examining our records, we have found that the Marathon 100 terminal strip has never been a stock part with Limitorque nor have we found any record of having purchased any Marathon 100 series terminal strips.
Enclosed is a copy of our field service report for changing the terminal strips at the jobsite. This report includes records of the order numbers and serial numbers of the equipment worked on and shipping papers on the parts shipped from our Lynchburg plant.
After studying all the available data, we have concluded that this is an isolated incident attributable to the inexperience of a field service engineer. We have not been able to determine where the Marathon 100 terminal strips came from, but it is possible that the field service engineer obtained these strips locally at the jobsite. Limitorque will provide a field service engineer and the appropriate parts to rework the 66 units originally field modified.
Please contact me if we can be of further assistance.
Very truly yours, LIMITORQUE CORP 0 RATION sk, d & W Daniel S. Warsing Technical Manager jhb Enclosure cc:
F. K. Denham P. G. McQuillan Vajay Shab/Bechtel Power Corp.
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