ML18030A154: Difference between revisions

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| issue date = 10/20/1980
| issue date = 10/20/1980
| title = Interim Deficiency Rept Re Excessive Voltage Drops in Ac Motor Operated Valve Controls Circuits Er 100450 & Er 100508.Caused by Sizeable Resistance of Small Control Cable Long Lengths.Alternatives Being Evaluated
| title = Interim Deficiency Rept Re Excessive Voltage Drops in Ac Motor Operated Valve Controls Circuits Er 100450 & Er 100508.Caused by Sizeable Resistance of Small Control Cable Long Lengths.Alternatives Being Evaluated
| author name = CURTIS N W
| author name = Curtis N
| author affiliation = PENNSYLVANIA POWER & LIGHT CO.
| author affiliation = PENNSYLVANIA POWER & LIGHT CO.
| addressee name = GRIER B H
| addressee name = Grier B
| addressee affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
| addressee affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
| docket = 05000387, 05000388
| docket = 05000387, 05000388
Line 17: Line 17:
=Text=
=Text=
{{#Wiki_filter:REGULATORY,
{{#Wiki_filter:REGULATORY,
%FORMATION DISTRIBUTION SYEM(RIOS)ACCESSION NBR:8010200056 OOCi'DATEt80/10/20NOTARIZED:
%FORMATION DISTRIBUTION SY EM (RIOS)
NODOCKETFACIL!50387Susquehanna Stea~ElectricStationgUnitirPennsy'Iva 50388Susquehanna SteamElectricStationiUnit2rPennsylv050003AUTH,NAMEAUTHORAFFILIATION CURTIS'~H~Pennsylvania Poser8LightCo,RECIP~NAMERKCIPIKNTAFFILIATION
ACCESSION NBR: 8010200056 OOC i'DATEt 80/10/20 NOTARIZED:
,IliGRIERgB,H,RegioniiPhiladelphiar OfficeoftheDirector
NO DOCKET FACIL!50 387 Susquehanna Stea~ Electric Stationg Unit ir Pennsy'Iva 50 388 Susquehanna Steam Electric Stationi Unit 2r Pennsylv 050003 AUTH,NAME AUTHOR AFFILIATION CURTIS'
~ H ~
Pennsylvania Poser 8 Light Co, REC IP ~ NAME RKCIPIKNT AFFILIATION
,I li GRIERg B,H, Region ii Philadelphiar Office of the Director


==SUBJECT:==
==SUBJECT:==
Interimdeficiency reptreexcessive vo,ltagedropsinacmotor.operatedvalvecontrolscircuitsKR1004508ER100508;Caused bysizeableresistance ofsmallcontrolcablelonglengths.Alternatives beingevaluated>
Interim deficiency rept re excessive vo,ltage drops in ac motor. operated valve controls circuits KR 100450 8
DISTRIBUTION CODE:B019SCOPIESRKCEIVKDeLTR ENCLSIZE:I,6TITLE:Construction Deficiency Report-(10CFR50.55E)
ER 100508;Caused by sizeable resistance of small control cable long lengths.Alternatives being evaluated>
NOTES:Send I8K3copiesFSAR8allamends.SendILE;3copiesFSARLallamends.0500038705000388RECIPIENT IOCODE/NA>41K ACTION+A/DLICENSNG04RUSHBROOKgM,'6 INTERNAL~AD/RCI/IE17ASLBP/J~HARDEDOLSTAFF19HYD/GEOBR22LICQUAL-BR12NRCPOR'2REV13REGFI01DRDSDEV21COPIES.L'iTTR*ENCL11111111RECIPIENT'O CODKiNAME YOUNGBLOOOzB 05STARKER,'7AEOD,18D/DIRHUMFAC15EQUIPQUAL,BRi1ILE09MPA20OELD21QABR10RUTHKRFOROeH
DISTRIBUTION CODE:
~IECOPIESLTTRENCL'1XTKRNAL:ACRSNSIC1608161LPDR03OCT2V1980TOTALNUMBEROFCOPIESREQUIRED; LTTR39ENCL
B019S COPIES RKCEIVKDeLTR ENCL SIZE:
/~ikj3'lggIIPl'>lQ)Ar+A TWONORTHNINTHSTREET,.PP8,L..~.IALLENTOWN,
I, 6
'PA:18101PHONEs(215)821~5151NORMANW.CURTISVicePresident-Engineering ILConairuction-Nuclear 821-5381October20,1980Mr.BoyceH.GrierDirector, RegionIU.S.NuclearRegulatory Commission 631ParkAvenueKingofPrussia,Pennsylvania 19406SUSQUEHANNA STEAMELECTRICSTATIONINTERIMREPORTOFADEFICIENCY ONEXCESSIVE VOLTAGEDROPSINACMOTOROPERATEDVALVECONTROLCIRCUITSERs100450/100508 FILE840-4PLA-560
TITLE: Construction Deficiency Report- (10CFR50.55E)
NOTES:Send I8K 3 copies FSAR 8 all amends.
Send ILE; 3 copies FSAR L all amends.
05000387 05000388 RECIPIENT IO CODE/NA>41K ACTION+
A/D LICENSNG 04 RUSHBROOKgM,'6 INTERNAL~
AD/RCI/IE 17 ASLBP/J ~ HARD EDO L STAFF 19 HYD/GEO BR 22 LIC QUAL-BR 12 NRC POR '2 REV 13 REG FI 01 DRDS DE V 21 COPIES
.L'iTTR
* ENCL 1
1 1
1 1
1 1
1 RECIPIENT'O CODKiNAME YOUNGBLOOOzB 05 STARKER, '7
: AEOD, 18 D/DIR HUM FAC15 EQUIP QUAL, BR i 1 ILE 09 MPA 20 OELD 21 QA BR 10 RUTHKRFOROeH ~ IE COPIES LTTR ENCL' 1
XTKRNAL: ACRS NSIC 16 08 16 1
LPDR 03 OCT 2V 1980 TOTAL NUMBER OF COPIES REQUIRED; LTTR 39 ENCL


==DearMr.Grier:==
/~i k
Thisletterservestoconfirminformation providedbytelephone toNRCRegionIInspector Mr.J.DurrbyMr.R.A.SchwanofPPGLonSeptember 18,1980.Duringthatconversation Mr.Durr.:wasadvisedthatthesubjectcon-ditionwasunderevaluation forreportability undertheprovisions of10CFR50.55(e).
j3
Thedeficiency involvesexcessive voltagedropsinthecontrolcircuitry ofthemotorstartersforsomemotoroperatedvalves(MOVs).(Motorstartersaredeviceswhichprovidethecontrolofpowertomotors.)ForACpoweredMOVsrthemotorstarteroperating coilsaresuppliedviaacontroltransformer tappedofftheMOVpowersupply.MultipleswitchesandrelaycontactsarewiredinthiscontrolcircuittomakeupthecontrollogicfortheMOV.AtSusquehanna SES,excessive voltagedropsoccurinmotorstartercontrolcableswhensize2,orlarger,startersformotoroperatedvalvesareenergized.
'lg g
Thesevoltagedrops,whicharesevereenoughtopreventmotorstarteroperation, arecausedbythesizeableresistance (severalohms)oflonglengths(severalthousandEeet)ofsmall(114cu)controlcable.Twenty-two (22)size2orlargermotorstartersarelocatedinClasslEsafetysystemssuchasReactorRecirculation andResidualHeatRemovalandmustbecheckedtodetermine ifexcessive voltaged'ropsoccur.Sincethesevalvesarerequiredtooperatetomitigateadesignbasisevent,theaforementioned failuretooperaterepresents asignificant deficiency indesign.Therefore, thedeficiency isdeemedreportable under10CFR50.55(e).
II Pl
Further,sincethedetailsofthisreportprovide."
'>l Q)
information relevanttothereporting requirements of10CFR21,thiscorrespondence isconsidered toalsodischarge anyformalresponsibility PPGLmayhaveforreporting incompliance thereto.Ao('galSI0$0g40PENNSYLVANIA POWEREsLIGHTCOMPANY
A r+
\:Mr.Boy'ce'.5.
A
GrierOctober20,1980PPGLEngineering isintheprocessofevaluating severalalternatives inordertodetermine anoptimumcourseofaction.Wecurrently estimatethatafinalreportof'hedeficiency andthecorrective actiontakenwillbetransmitted toyouinJanuary,1981.Verytrulyyours,N.W.CurtisVicePresident-Engineering aConstruction-Nuclear FLW:mcbcc:Mr.VictorStello(15)Director-Office ofInspection 6Enforcement U.S.NuclearRegulatory Commission Washington, D.C.20555<Mr.G;--McDonald,-
 
Director.
TWO NORTH NINTH STREET,
OfficeofManagement Information 6Program-Control U.S.NuclearRegulatory Commission Washington, D.C.20555Mr.RobertM.GalloU.S.NuclearRegulatory Commission P.O.Box52Shickshinny, Pennsylvania 18655}}
. PP8,L..
~
I ALLENTOWN,'PA: 18101 PHONEs (215) 821 ~ 5151 NORMAN W. CURTIS Vice President-Engineering IL Conairuction-Nuclear 821-5381 October 20, 1980 Mr. Boyce H. Grier Director, Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406 SUSQUEHANNA STEAM ELECTRIC STATION INTERIM REPORT OF A DEFICIENCY ON EXCESSIVE VOLTAGE DROPS IN AC MOTOR OPERATED VALVE CONTROL CIRCUITS ERs 100450/100508 FILE 840-4 PLA-560
 
==Dear Mr. Grier:==
This letter serves to confirm information provided by telephone to NRC Region I Inspector Mr. J. Durr by Mr. R. A. Schwan of PPGL on September 18, 1980.
During that conversation Mr. Durr.:was advised that the subject con-dition was under evaluation for reportability under the provisions of 10CFR50.55(e).
The deficiency involves excessive voltage drops in the control circuitry of the motor starters for some motor operated valves (MOVs).
(Motor starters are devices which provide the control of power to motors.)
For AC powered MOVsr the motor starter operating coils are supplied via a control transformer tapped off the MOV power supply.
Multiple switches and relay contacts are wired in this control circuit to make up the control logic for the MOV.
At Susquehanna
: SES, excessive voltage drops occur in motor starter control cables when size 2, or larger, starters for motor operated valves are energized.
These voltage drops, which are severe enough to prevent motor starter operation, are caused by the sizeable resistance (several ohms) of long lengths (several thousand Eeet) of small (114 cu) control cable.
Twenty-two (22) size 2 or larger motor starters are located in Class lE safety systems such as Reactor Recirculation and Residual Heat Removal and must be checked to determine if excessive voltage d'rops occur.
Since these valves are required to operate to mitigate a design basis
: event, the aforementioned failure to operate represents a significant deficiency in design.
Therefore, the deficiency is deemed reportable under 10CFR50.55(e).
: Further, since the details of this report provide." information relevant to the reporting requirements of 10CFR21, this correspondence is considered to also discharge any formal responsibility PPGL may have for reporting in compliance thereto.
Ao(
'gal SI0$0g40 PENNSYLVANIA POWER Es LIGHT COMPANY
 
\\
:Mr. Boy'ce'.5. Grier October 20, 1980 PPGL Engineering is in the process of evaluating several alternatives in order to determine an optimum course of action.
We currently estimate that a final report of'he deficiency and the corrective action taken will be transmitted to you in January, 1981.
Very truly yours, N.
W. Curtis Vice President-Engineering a Construction-Nuclear FLW:mcb cc:
Mr. Victor Stello (15)
Director-Office of Inspection 6 Enforcement U. S. Nuclear Regulatory Commission Washington, D.C.
20555
<Mr. G;--McDonald,Director.
Office of Management Information 6 Program-Control U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Mr. Robert M. Gallo U. S. Nuclear Regulatory Commission P.
O. Box 52 Shickshinny, Pennsylvania 18655}}

Latest revision as of 03:22, 7 January 2025

Interim Deficiency Rept Re Excessive Voltage Drops in Ac Motor Operated Valve Controls Circuits Er 100450 & Er 100508.Caused by Sizeable Resistance of Small Control Cable Long Lengths.Alternatives Being Evaluated
ML18030A154
Person / Time
Site: Susquehanna  
Issue date: 10/20/1980
From: Curtis N
PENNSYLVANIA POWER & LIGHT CO.
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
10CFR-050.55E, 10CFR-50.55E, PLA-560, NUDOCS 8010240456
Download: ML18030A154 (4)
v • d • e


Text

REGULATORY,

%FORMATION DISTRIBUTION SY EM (RIOS)

ACCESSION NBR: 8010200056 OOC i'DATEt 80/10/20 NOTARIZED:

NO DOCKET FACIL!50 387 Susquehanna Stea~ Electric Stationg Unit ir Pennsy'Iva 50 388 Susquehanna Steam Electric Stationi Unit 2r Pennsylv 050003 AUTH,NAME AUTHOR AFFILIATION CURTIS'

~ H ~

Pennsylvania Poser 8 Light Co, REC IP ~ NAME RKCIPIKNT AFFILIATION

,I li GRIERg B,H, Region ii Philadelphiar Office of the Director

SUBJECT:

Interim deficiency rept re excessive vo,ltage drops in ac motor. operated valve controls circuits KR 100450 8

ER 100508;Caused by sizeable resistance of small control cable long lengths.Alternatives being evaluated>

DISTRIBUTION CODE:

B019S COPIES RKCEIVKDeLTR ENCL SIZE:

I, 6

TITLE: Construction Deficiency Report- (10CFR50.55E)

NOTES:Send I8K 3 copies FSAR 8 all amends.

Send ILE; 3 copies FSAR L all amends.

05000387 05000388 RECIPIENT IO CODE/NA>41K ACTION+

A/D LICENSNG 04 RUSHBROOKgM,'6 INTERNAL~

AD/RCI/IE 17 ASLBP/J ~ HARD EDO L STAFF 19 HYD/GEO BR 22 LIC QUAL-BR 12 NRC POR '2 REV 13 REG FI 01 DRDS DE V 21 COPIES

.L'iTTR

  • ENCL 1

1 1

1 1

1 1

1 RECIPIENT'O CODKiNAME YOUNGBLOOOzB 05 STARKER, '7

AEOD, 18 D/DIR HUM FAC15 EQUIP QUAL, BR i 1 ILE 09 MPA 20 OELD 21 QA BR 10 RUTHKRFOROeH ~ IE COPIES LTTR ENCL' 1

XTKRNAL: ACRS NSIC 16 08 16 1

LPDR 03 OCT 2V 1980 TOTAL NUMBER OF COPIES REQUIRED; LTTR 39 ENCL

/~i k

j3

'lg g

II Pl

'>l Q)

A r+

A

TWO NORTH NINTH STREET,

. PP8,L..

~

I ALLENTOWN,'PA: 18101 PHONEs (215) 821 ~ 5151 NORMAN W. CURTIS Vice President-Engineering IL Conairuction-Nuclear 821-5381 October 20, 1980 Mr. Boyce H. Grier Director, Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406 SUSQUEHANNA STEAM ELECTRIC STATION INTERIM REPORT OF A DEFICIENCY ON EXCESSIVE VOLTAGE DROPS IN AC MOTOR OPERATED VALVE CONTROL CIRCUITS ERs 100450/100508 FILE 840-4 PLA-560

Dear Mr. Grier:

This letter serves to confirm information provided by telephone to NRC Region I Inspector Mr. J. Durr by Mr. R. A. Schwan of PPGL on September 18, 1980.

During that conversation Mr. Durr.:was advised that the subject con-dition was under evaluation for reportability under the provisions of 10CFR50.55(e).

The deficiency involves excessive voltage drops in the control circuitry of the motor starters for some motor operated valves (MOVs).

(Motor starters are devices which provide the control of power to motors.)

For AC powered MOVsr the motor starter operating coils are supplied via a control transformer tapped off the MOV power supply.

Multiple switches and relay contacts are wired in this control circuit to make up the control logic for the MOV.

At Susquehanna

SES, excessive voltage drops occur in motor starter control cables when size 2, or larger, starters for motor operated valves are energized.

These voltage drops, which are severe enough to prevent motor starter operation, are caused by the sizeable resistance (several ohms) of long lengths (several thousand Eeet) of small (114 cu) control cable.

Twenty-two (22) size 2 or larger motor starters are located in Class lE safety systems such as Reactor Recirculation and Residual Heat Removal and must be checked to determine if excessive voltage d'rops occur.

Since these valves are required to operate to mitigate a design basis

event, the aforementioned failure to operate represents a significant deficiency in design.

Therefore, the deficiency is deemed reportable under 10CFR50.55(e).

Further, since the details of this report provide." information relevant to the reporting requirements of 10CFR21, this correspondence is considered to also discharge any formal responsibility PPGL may have for reporting in compliance thereto.

Ao(

'gal SI0$0g40 PENNSYLVANIA POWER Es LIGHT COMPANY

\\

Mr. Boy'ce'.5. Grier October 20, 1980 PPGL Engineering is in the process of evaluating several alternatives in order to determine an optimum course of action.

We currently estimate that a final report of'he deficiency and the corrective action taken will be transmitted to you in January, 1981.

Very truly yours, N.

W. Curtis Vice President-Engineering a Construction-Nuclear FLW:mcb cc:

Mr. Victor Stello (15)

Director-Office of Inspection 6 Enforcement U. S. Nuclear Regulatory Commission Washington, D.C.

20555

<Mr. G;--McDonald,Director.

Office of Management Information 6 Program-Control U. S. Nuclear Regulatory Commission Washington, D.C.

20555 Mr. Robert M. Gallo U. S. Nuclear Regulatory Commission P.

O. Box 52 Shickshinny, Pennsylvania 18655

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