ML20071H893

Forwards Addl Info Requested Per 830512 Telcon Re Util Decision to Replace Existing Control Power Transformers w/encapsulated-tube Transformers Per 10CFR50,App R. Implementation Planned During Third Refueling Outage

ML20071H893
Person / Time
Site:	Beaver Valley
Issue date:	05/20/1983
From:	Carey J DUQUESNE LIGHT CO.
To:	Varga S Office of Nuclear Reactor Regulation
References
TAC-51572, NUDOCS 8305250516
Download: ML20071H893 (5)

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Telephone (412) 4564000 Nuclear Division P.O. Box 4 Shippingport, PA 150776 Director of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Attn:

Mr. Steven A. Varga, Chief Operating Reactors Branch No. 1 Division of Licensing Washington, DC 20555

Reference:

Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 Appendix R to 10 CFR 50 DLC letter to NRC dated. April 18, 1983 Gentlemen:

Enclosed is the additional information you requested per our telephone conversation of May 12, 1983 with reference to our April 18, 1983 letter and our decision to replace the existing control power trans-formers (CPTs) with new encapsulated-type transformers vs. installing fuses due to the unavailability of environmentally qualified fuse holders for the old type transformers and other reasons noted in our April 18 letter. The old type CPTs were open core-and-coil type transformers made of paper and varnish. To preclude a possible ignition source from a sec-ondary short circuit, we propose to replace these transformers in our 480 volt Emergency Motor Control Centers with new CPTs of an encapsulated design.

The attached information from the manufacturer provides material properties and characteristics of the transformers. As noted in the manufacturer's Technical Bulletin (9B74), the " Molded Noryl Shall" of the transformer and its characteristics are described.

In addition to the listed information, the manufacturer has informed us that the material has passed a flanmability test (U.L. #94,1980), and that the potential for ignition due to hot shorts is not possible due to the low wattage, high impedence characteristics of these transformers.

The implementation schedule for change-out of the CPTs is during our third refueling outage, which is tentatively to begin June 11, 1983 and projected to be complete September 6,1983.

In order to accomplish this task on schedule, we would need to' procure and expedite these trans-formers no later than May 31, 1983. Unless otherwise directed, we will proceed as scheduled.

OC)b Please contact us if additional information or clarification is necessary.

Very truly yours, b,

f 8305250516 830520 PDR ADOCK 05000334

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P PDR J. Car Vice President, Nuclear L

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Beav r Vallsy Power Stcticn, Unit Na.1 D:ck3t Ns. 50-334, Lic;nsa Na. DPR-66 Appendix R to 10 CFR 50

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Enclosures:

' SHr. W. M. Troskoski, Resident Inspector cc:

U. S. Nuclear Regulatory Commission

' Beaver Valley Power Station

'Shippingport, PA 15077 U. S. Nuclear. Regulatory Commission

~ c/o Document Management Branch Washington, DC 20555 U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Attn:.

J. M. Allen, Acting Regional Administrator Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406 U. S. !!uclear Regulatory Commission Division of Licensing Attn:

D. G. Eisenhut, Director Washington, DC 20555 f

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Barrier Terminals - 3 Ways Better ImperviTron potented barrier terminals are uniove among machine tool control transformers. and off er three special advantages:

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300*;, more terminal contact crea is provided, resulting in low. loss connections.

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3.Thee eep barriers minimize lookoge and reduce the chance of shorts from froyed 3 J, [ )*f,.,,.,

leads or car wiring.

Molded Noryl '" Shell-3 Unique Benefits.

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[.M its sturdy impact-resistant shell of GE Noryl. Here are three additional 4ir benefits it offers:

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1. Foilures due to domoge from careless installation (i.e. broken

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terminals and abroded coils) are practically eliminated.

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2. In conjunction with the cost epoxy filler. heat conduction is provided which results in a cooler. running transformer.

3. The transformer coil is completely protected against moisture. dust.

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A Few Words About Noryl'*

%eit eatinguishmg with high heat resestonce and low creep Noryl es ry on ideal complement to Mecron s impervoiron Norve g

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escellent performance over the euceptional t-mperature range of Imperv.Tran Qga

-450C to over 121oC. The lmperviTron housing uses Noryl SEl-GFN3 b

GEssoughest variety w hic h has a UL contmuous use 'emperatu,e Delivery --- Weeks Not Mo' nths!

rating of 1050C. o 3aoC tens le strength of 17 000 pse and on trod

.mpact strength of 2 3 foot pounds ench of notch of room tem-SpeCiol ratings Con be made up.in evoluotion quantities on short perature No wonder Micron offers the best machme tool control notice, typically 4-6 weeks ARO. Any required combination of transformer worronty in the industry 8 primary and secondary voltages and power ratings is available, with

' var,# '* * **t s'e<*e sesoe *o** oe c.a.cos r ecec ce most popular combinations corried in stock (see page 3).

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ImpervlTrant Extra Margin Bec use they aro cost with o speci lly f:rmultted high th rmti ccnductivity epoxy resin. ImperviTron windings run cocl:r f r o given load than comparable open core and coil designs. The special resin conducts the heat from the windings to the Noryl shell, which radiates it so efficiently that a typical ImperviTron will operate continuously of 20Y. overload without exceeding NEMA temperature rise standards.

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Voltage Output Vs. Load Burges Since the dynamic chorocteristics of many electrical loads include heavy U

DATA DERIVED FROM NEMA ST.I.4.1968.

initial surge (inrush) currents.11 is usual to let the inrush VA as well as the Q Fio. 4 so a 4 5ti.

steady. state (sealed) VA requirements influence the transformer size h PAGES 24 a 25 selection. The imperviTron is designed for inherent load regulation choroc.

u teristics adequate to meet the inrush requirement for almost any load for q l

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which the corresponding sealed requirements are met. The chart shows the C cvtrcurrents under which the various VA rated ImperviTrans will still k*

deliver 85% of rated terminal voltage at typical power f actors.

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f plication, first calculate the power factor and the required inrush VA "I 400 l

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i dition. Next, use the graph to determine the Percent Roted Load Current for yS 200<

en ImperviTron of that Roted Volt. Amps for that power factor and multiply g l

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l It by the imperviTron current roting (nomeplate VA/ secondary V). This l

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calculated overcurre.it times 85% of the nomeplate secondary V is the 50 f5 10 0 200 300 500 750 1000 1500 ImperviTron calculated inrush copobility with that specific load. It should RATED Vol.T AMPS cxceed the requiredinrush VA previously calculated.

IlCRON CATALOG IIUMBEll$ CROSS REFERENCED TO STANDARD TERMINAL TYPE MACHINE TOOL TRANSFORMERS (230/460 V Primary,115 V Secondary at 50/60 Hz)

InterChangeaIBility C1 Isotsen G.L HEVI-0UTT NFFERSON AcaK 00NGAN WESTINGM00$(

25 geesetzt3 wo25 6352401 The ImperviTron and larger Micron 50 steestzt3 9T55Y42 WO50 636 2411 1A 181010 53 05 IF0890 mochine tool control transformers 75 teFISIZ13 9155Y43 WO75 636 2421 TA 81019 5307 1F0927 ore directly interchangeable with 100 310es1213 9T55V44 W100 636 2431 TA1810ll 5310 IF0906 most other manufacturers' trans.

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' 8ttestr137 9T55Y45 W150 636 2441 TA 81012 5315 IF0907 formers. The accompanying cross 200 W 9f55Y46 W200 636 2451 53 20 IF0908 reference chart should be used to 250 82988f213 9155Y47 W250 636 2461 TA 810:3 5325 IF0909 find Micron's equivalent.

300 Basesitti 9155Y48 W300 636 2471 TA 81021 53 30 iF0910 Y

M0 Baleeft13 W350 636 2481 TA 81014 53 35 iF0911 F cottons the dato required for li 500 blee8TZ13 9755Y50 W500 636 2491 TA 81015 53 50 IF0912 750 575eert13 9155Y51 w?50 636 2501 TA -81016 5375 IF0913 switching to Micron transformers without further product testing is already on file with the appropriate testing laboratories.

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.083 11 350 5 l/4 41/2 3-13/16 3-3/4 33/4 13/64 21/64

.083 14 500 53/8 5-1/4 4-7/16 41/8 4-3/8 5/16 11/16 1/8 16 SECONDARY IMPEDANCES 750 7

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25 15.88 PRIMARY volts SECONDARY volts CAT.ll0.*

ImpervlTrans are ovulloble in all UL/CSA 50 la72 220/ 440........... 110 recognized ratings from 25 750 VA. Specific l

75 7.85 230/460............ 115.............B BTZ13 rotings are listed in the interchangeability and 100 8.02 240/480............

120 mechanical specification. charts. Micron also l

150 5.5 240/ 480............ 24..............B PU7 stands ready to manufacture any non-standard

!r 200 5.17 e mbination of single or multiple voltage 5 5 0 '.".'.' $.'.' '.'.'.'.'.".' 110

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250 3.67 575.

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..B WZ13 primaries and secondorles over the range 6 30 3.56 600.............

120 600V. as well as "in-between" VA ratings over 350 31 208............. 120............. B M15 the range 25 750 VA.

• lnsert VA rating in blanks in Catalog No.

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e, ck. ia a cor..ad<.4 The above ratings are based on 50/60 Hz co *ieve.a... coa c meron e.e.edme cnw a d l

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l L Micron Industnes' Machine Tool Control Transformer Numbering System Style Profises VA Rating Primary Voltages Secondary Voitages B. imperviTran For t 999 VA ratings. insert 4gy.F 220V-N 575V W 6V 4 100VIl 240V-19 C Open Core-andtoil rating verbatim (001999).

95V G 230V8 600V Y 12V-5 110V 12 277V-20 at t K Aa ns t b for H

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Y Special F age Designators A Autotransformer For Example: 1000VA becomes IKO ll5V4 380V-R 24V 7 Il8V 33 460V-23 0-Entra Barrier Terminals 1500VA becomes IK5 ll1V K 415V-D 28V-29 120V-15 480V 24 E With Fast On 120V-L 440V S 42V-31 200V 30 550V 25 (Quick Disconnect) Terminals 190V E 460V-T 48V-9 208v 16 575V-26 L-inductor 200V-C 480V U 60V 32 220V.17 600V 27 5 ThermalSensing 208V-M 550VV 95V-10 230V 18 Special-00 T TallTran(reduced

$8tfil's Z denotes Triple Rated (Rated VoltageiS%)

mounting area for given VA size)

LIJ2DS N Exemple: a SY 050 at I 131s JK W-Wire (eads

_II lumpers, no fuse clips )

I a SUFFIXE5 (JK: Type "K" Fuse clips and Jumpers) 1 SpeClal Mechanical Construction 11 No jumpers, no fuse clips i SECONDARY VOLTAGES (1318 115/230)

Y-Low Capacitance Shield II Type "K" Fusa clips, no jumpers TRIPLE-RATED Z Electrical specifications other than JK. Type "K" Fuse clips and jumpers PRIMARY VOLTAGES (BT.230/460 Volts.VA and Primary Secondary 1M Type "M" Fuse clips.no jumpers SPEC 5AL FE UR 5 ermol Sensing: Y: Low-C Shield)

Capacitance (e.g. freq.)

JM Type "M" Fuse clips and jumpers STYLE (B lMPERVITRAN) 4

$ Open Core-and-Coil Transformers As a 'ower. cost alternative to the ImperviTran in the ranga of 25-750 VA. Micron offers open core-and-coil transformers which are electrically equivalent to the imperviTrans. In addition, multi KVA (115KVA) ratings are available in the CompacTran Series which minimires size and weight while featuring the usual fast Micron delivery in both standard and non-standard voltagss.

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Other Rwailable Transformers g-The following are also available f rom Micron on a 4-8 week delivery basis. Prices will be quoted upon receipt of your specifications.

1. Autotransformer configurations with significant cost and space savings 125kVa. 2. Multiple primary and /or secondary voltages for " universal" application and inventory simplification.

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3. High-voltage primerles and /or seconderles to 20kV "Hi-Pot'*

Si rd VA pen Core-end Cell ratings. 4. Special frequency retings over the range of 25 400Hr.

Open Core-ond-Coll Typical MICRON solutions to unique transformer problems Of W

,ndustri.I Machinery Manufacturer YAsh' Applications Motor control for industrial chain hoist Problem: High failure rate due to damage caused to unprotected terminals and terminal breakage caused by lead stress. Special low. profile transformer needed due to clearance problem. Fast delivery was crucial, but competitive pricing had to be maintained because of volume.

Solution: Micrcn adopted its proprietary barrier-terminal molded transformer (ImperviTran

• p predecessor) to occommodate extra-sturdy terminals, eliminating cause of failure. Critical dimension was held to 1/8"less than maximum allowoble with appeorance rated by customer as " greatly improved." Customer also considered Micron's price and delivery "quite satistoctory."

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Problem: Controls manuf acturer Application Pilot lamp assembly A;plicoffen Highvoltage

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required a second source for a coupling transformer for

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unique precisely dimensioned molded transformer. Transformer molding Problems Produce a rollekle transformeQ: ~hathrill withstand must have through-access holes for linking push buttons with switch contacts. However. center to. center dimension for push button was 40.000 V peaks between primary and secondary despite different than that for switch, requiring that access hole be contoured mechanical abuse and a wide range of operating environments, at a precisely to permit plungers to operate freely. Second source also required reasonable price and dependoble delivery. Resonant frequency to meet special delivery needs to be acceptable.

must be maintoined within 15% of norrinal.

Solutlom Micron engineered a unique mold pin which enabled a through-a So xtion Micron deva, loped a molded high voltage trans-hole conformation that was absolutely trouble free in user's equipment.

farmer which has been used exclusively for 10 years. A different Micron performance es second source was so satisfactory that Micron has version of this transformer has now leen adopted by another now been promoted to prime source for this unusual device.

customer for a similar application with equally good results, blieree's Unigne 5 YearIgorranty

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MICRONINDUSTRIE5 1830 32nd Avenue, Stone Park. Illinois 60165 (312)345-0788 J