ML17353A614: Difference between revisions

From kanterella
Jump to navigation Jump to search
(Created page by program invented by StriderTol)
 
(Created page by program invented by StriderTol)
 
(2 intermediate revisions by the same user not shown)
Line 3: Line 3:
| issue date = 02/28/1996
| issue date = 02/28/1996
| title = Part 21 Rept 10CFR21-0073 Re Defect W/Voltage Adjust Potentiometer Mfg by Chicago Telephone Supply Used on NEI Peebles (Portec) Voltage Regulators at Plant.Util Updating Voltage Regulators W/Maury Instrument Corp Potentiometer
| title = Part 21 Rept 10CFR21-0073 Re Defect W/Voltage Adjust Potentiometer Mfg by Chicago Telephone Supply Used on NEI Peebles (Portec) Voltage Regulators at Plant.Util Updating Voltage Regulators W/Maury Instrument Corp Potentiometer
| author name = NUDING M
| author name = Nuding M
| author affiliation = MKW POWER SYSTEMS, INC.
| author affiliation = MKW POWER SYSTEMS, INC.
| addressee name = HODGE V
| addressee name = Hodge V
| addressee affiliation = NRC
| addressee affiliation = NRC
| docket = 05000250, 05000251
| docket = 05000250, 05000251
Line 17: Line 17:


=Text=
=Text=
{{#Wiki_filter:CATEGORY 1 REGULATOR'TNFORMRTION DISTRIBUTION
{{#Wiki_filter:CATEGORY 1 REGULATOR'TNFORMRTION DISTRIBUTION %STEM. (RIDE)
%STEM.(RIDE)ACt.F;4SIO>'BR:9603270295 DOC.DATE: 96/02/28 NOTARIZED:
ACt.F;4SIO>'BR:9603270295           DOC.DATE: 96/02/28     NOTARIZED: NO         DOCKET &#xb9; FA('!L.:<," 250 Turkey   Point Plant, Unit 3, Florida         Power and Light   C 05000250 50--251 Turkey Point Plant, Unit 4, Florida         Power and Light   C 05000251 AU"1'H.NAME           AUTHOR AFFILIATION NUDING,M.             MKW Power Systems,     Inc.
NO DOCKET&#xb9;FA('!L.:<," 250 Turkey Point Plant, Unit 3, Florida Power and Light C 05000250 50--251 Turkey Point Plant, Unit 4, Florida Power and Light C 05000251 AU"1'H.NAME AUTHOR AFFILIATION NUDING,M.MKW Power Systems, Inc.REClk.NAME RECIPIENT AFFILIATION HODGE,V.NRC-No Detailed Affiliation Given SUBJECT;Part 21 rept 10CFR21-0073 re defect w/voltage adjust potentiometer mfg by Chicago Telephone Supply used on NEI Peebles (Portec)voltage regulators at plant.Util updating voltage regulators w/Maury Instrument Corp potentiometer.
REClk.NAME           RECIPIENT AFFILIATION HODGE,V.               NRC No   Detailed Affiliation Given SUBJECT;     Part 21 rept 10CFR21-0073 re defect w/voltage adjust potentiometer mfg by Chicago Telephone Supply used on NEI Peebles (Portec) voltage regulators at plant. Util updating voltage regulators w/Maury Instrument Corp potentiometer.
-~DISTRIBUTION CODE: IE19T COPIES RECEIVED:LTR
                                                            -~
\ENCL i SIZE: TITLE: Part 21 Rept (50 DKT)NOTES: INTERN RECIPIENT ID CODE/NAME PD FILE CENTE 1 PM PECB RES/DSIR/EIB RGN2 RGN4 COPIES LTTR ENCL 1 1 1 1 2 2 1 1 1 1 1 1 RECIPIENT ID CODE/NAME CROTEAU,R NRR/DRCH/HQMB PDR WARD, M.RGNl RGN3 COPIES LTTR ENCL 1 1 1 1 1 1 1 1 1 1 EXTERNAL: INPO RECORD CTR NRC PDR 1 1 1 1 NOAC SILVERFE NUDOCS FUI L TXT 1.1 1 1 D 0 NOTE TO ALL"RZDS" RECZPXENTS(PLEASE HELP,US TO REDUCE WASTEI CONTACT THE DOCUMENT CONTROL DESK(ROOM OWFN 5D"5(EXTe 415-2083)TO ELZMZNATE YOUR NAME FROM DXSTRXBUTZON LZSTS FOR DOCUMENTS YOU DON'T NEED!",~isoocus ggse~~gscQ~<I FULL~EXT'ONVERSION R EQUIRED TOTA: NUMBER OF COP"".S R!"QUJ RED: LTTR 16 ENCL 16 MKW-o t jbz9o pgzl~QlCI10 NOITrt C 28 February, 1996 Vern Hodge USNRC Mail Stop 0-llA1 Washington, DC 20555  
DISTRIBUTION CODE:       IE19T COPIES RECEIVED:LTR \           ENCL i   SIZE:
TITLE:   Part   21 Rept (50 DKT)
NOTES:
RECIPIENT            COPIES            RECIPIENT           COPIES ID CODE/NAME         LTTR ENCL      ID CODE/NAME        LTTR ENCL PD                        1     1     CROTEAU,R                1     1 INTERN        FILE  CENTE      1       1     1     NRR/DRCH/HQMB           1      1 PM PECB          2    2    PDR WARD, M.             1      1 RES/DSIR/EIB              1     1     RGNl                    1     1 RGN2                      1     1     RGN3                    1     1 RGN4                      1     1 EXTERNAL: INPO RECORD CTR             1    1    NOAC SILVERFE            1    . 1 NRC PDR                   1     1     NUDOCS FUI L TXT         1     1             D 0
                                                                            ",  ~isoocus gscQ~<
ggse~~
NOTE TO ALL "RZDS" RECZPXENTS(
PLEASE HELP,US TO REDUCE WASTEI CONTACT THE DOCUMENT CONTROL DESK(
ROOM OWFN 5D"5(EXTe 415-2083) TO ELZMZNATE YOUR NAME FROM DXSTRXBUTZON LZSTS FOR DOCUMENTS YOU DON'T NEED!
I FULL ~EXT'ONVERSION         R EQUIRED TOTA: NUMBER OF COP" ".S R!"QUJ RED: LTTR         16   ENCL     16
 
t MKW- o                                                                 pgzl     ~ jbz9o C
QlCI10 NOITrt 28 February, 1996 Vern Hodge USNRC Mail Stop 0-llA1 Washington,       DC     20555


==Reference:==
==Reference:==
Report No. 10CFR21-0073
==Subject:==
Reportable defect. with NEI voltage regulator voltage adjust potentiometer r
==Dear Mr. Hodge:==


Report No.10CFR21-0073
MKW  Power    Systems'eport                10CFR21-0073 is attached which addzesses      a 10CFR21          reportable. defect with the voltage, adjust potentiometer used on the NEI Peebles (Portec) voltage regulators. This was brought to our attention by FP6L - Turkey Point and we immediately began an investigation to determine the impact on other users of the same/similar ecpxipment. Our investigation was completed on 2/26/96.
Yours very      truly, MKW POWER      SYSTEMS,        INC.
~i'        Muo~g Michael Nuding General Manager            Quality          Assurance MN  dg Enclosure 9603270295 960228 PDR  AOOC(4, OSOOO2SOi S                      PDR lp('I Post Office Box 1928 ~ Rocky Mount, North Carolina 27802-1928 ~ Phone: (919) 9 -2720 TWX: (510) 929-0725 ~ FAX: (919) 446-3830


==Subject:==
0 1
Reportable defect.with NEI voltage regulator voltage adjust potentiometer r
I
 
Report No. 10CFR21-0073 FEBRUARY 27~            1996 10CFR21 REPORTING OF DEFECTS AND NON-COMPLIANCE COMPONENT:        Chicago Telephone Supply (CTS), p/n 115R251A Voltage Ad)ust Potentiometer SYSTEM:            Diesel Generator control systems with NEI Peebles (Portec) Voltage Regulators CONCLUSION:        Defect      is  Reportable          in    Accordance          with      10CFR21 PREPARED BY:                                                                          DATE:        ~ +/+~
Donald      D    Galeazzi Engineering Manager REVIENED BY                                                                          DATE:
Michael Nudi g General Manager, Quality Assurance Post Office Box 1928 ~ Rocky Mount, North Carolina 27802-1928  ~ Phone: (919) 977-2720 TWX: (510) 929-0725 ~ FAX: (919) 446-3830


==Dear Mr.Hodge:==
0 0 REPORT NO. 10CFR21-0073 PAGE   1 OF 5 MKW Power Systems witnessed   repair and testing of a voltage regulator foz   FPEL Turkey Point at NEI Peebles on 2/10/96 and 2/11/96. NEI manufactured many of the voltage regulators utilized in MKW's safety related diesel generators. Voltage instability was observed and was determined to be caused by foreign material on the stationary wiper portion of the R4 voltage adjust potentiometer. The potentiometer is 250 ohm, 2wg manufactured by Chicago Telephone Supply (CTS), p/n 115R251A and had been used by NEI for over twenty years for this application.
MKW Power Systems'eport 10CFR21-0073 is attached which addzesses a 10CFR21 reportable.
Because of availability problems, NEI replaced the CTS potentiometer with Mauzy Instrument Corporation p/n 50-M123-251 in 8/94). This is an enclosed precision wirewound potentiometer, 250 ohm, 1.5w, with a shaft locking nut. According to NEI, applied burden is 0.06w. When compared to the CTS component, the Mauzy is an upgrade in quality and appears to be less susceptible to contamination on the wiper surface. The FPEL zegulatoz had the R4 potentiometer replaced with the Mauxy part while at NEI and the voltage instability was corrected.
defect with the voltage, adjust potentiometer used on the NEI Peebles (Portec)voltage regulators.
The purpose of the R4 potentiometer is to adjust generator voltage to rated value after installation of the remote voltage adjust motor operated potentiometer. This is normally a one-time adjustment which occurs during initial installation/startup of the EDG and is applicable to the automatic and manual (if used) voltage regulators.
This was brought to our attention by FP6L-Turkey Point and we immediately began an investigation to determine the impact on other users of the same/similar ecpxipment.
MKW has been supplying NEI voltage regulators foz safety related EDG control systems since 1972. This incident and one prior in 1994 (FPEL EDG 4A and 4B respectively) are the only reported problems of this type; therefore,     it is difficult to interpret this occurrence as a defect. In addition, because R4 is normally a one-time adjustment, any foreign material which develops/
Our investigation was completed on 2/26/96.Yours very truly, MKW POWER SYSTEMS, INC.~i'Muo~g Michael Nuding General Manager-Quality Assurance MN dg Enclosure 9603270295 960228 PDR AOOC(4, OSOOO2SOi S PDR lp('I Post Office Box 1928~Rocky Mount, North Carolina 27802-1928
accumulates on the wiper surface will not affect voltage regulator operation because     it will not interfere with the wiper surface to wiper axm interface. It is recognized that this could cause problems   if field adjustment of R4 is required; therefore, MKW Power Systems will notify all customers with NEI voltage regulators about this potential condition.
~Phone: (919)9-2720 TWX: (510)929-0725~FAX: (919)446-3830 0 , 1 I Report No.10CFR21-0073 FEBRUARY 27~1996 10CFR21 REPORTING OF DEFECTS AND NON-COMPLIANCE COMPONENT:
Chicago Telephone Supply (CTS), p/n 115R251A Voltage Ad)ust Potentiometer SYSTEM: Diesel Generator control systems with NEI Peebles (Portec)Voltage Regulators CONCLUSION:
Defect is Reportable in Accordance with 10CFR21 PREPARED BY: Donald D Galeazzi Engineering Manager DATE:~+/+~REVIENED BY DATE: Michael Nudi g General Manager, Quality Assurance Post Office Box 1928~Rocky Mount, North Carolina 27802-1928
~Phone: (919)977-2720 TWX: (510)929-0725~FAX: (919)446-3830 0 0 REPORT NO.10CFR21-0073 PAGE 1 OF 5 MKW Power Systems witnessed repair and testing of a voltage regulator foz FPEL Turkey Point at NEI Peebles on 2/10/96 and 2/11/96.NEI manufactured many of the voltage regulators utilized in MKW's safety related diesel generators.
Voltage instability was observed and was determined to be caused by foreign material on the stationary wiper portion of the R4 voltage adjust potentiometer.
The potentiometer is 250 ohm, 2wg manufactured by Chicago Telephone Supply (CTS), p/n 115R251A and had been used by NEI for over twenty years for this application.
Because of availability problems, NEI replaced the CTS potentiometer with Mauzy Instrument Corporation p/n 50-M123-251 in 8/94).This is an enclosed precision wirewound potentiometer, 250 ohm, 1.5w, with a shaft locking nut.According to NEI, applied burden is 0.06w.When compared to the CTS component, the Mauzy is an upgrade in quality and appears to be less susceptible to contamination on the wiper surface.The FPEL zegulatoz had the R4 potentiometer replaced with the Mauxy part while at NEI and the voltage instability was corrected.
The purpose of the R4 potentiometer is to adjust generator voltage to rated value after installation of the remote voltage adjust motor operated potentiometer.
This is normally a one-time adjustment which occurs during initial installation/startup of the EDG and is applicable to the automatic and manual (if used)voltage regulators.
MKW has been supplying NEI voltage regulators foz safety related EDG control systems since 1972.This incident and one prior in 1994 (FPEL EDG 4A and 4B respectively) are the only reported problems of this type;therefore, it is difficult to interpret this occurrence as a defect.In addition, because R4 is normally a one-time adjustment, any foreign material which develops/accumulates on the wiper surface will not affect voltage regulator operation because it will not interfere with the wiper surface to wiper axm interface.
It is recognized that this could cause problems if field adjustment of R4 is required;therefore, MKW Power Systems will notify all customers with NEI voltage regulators about this potential condition.
Chicago Telephone Supply (CTS), p/n 115R251A (NEI p/n 01068).
Chicago Telephone Supply (CTS), p/n 115R251A (NEI p/n 01068).
REPORT NO.10CFR21-0073 PAGE: 2 OF 5 U.ST Duke Power-Oconee FPRL-St.Lucie&#xb9;2 FPEL-Turkey Point Grand Gulf Knolls Atomic-Kesselring Portland G.E.-Trogan PPEL-Susquehanna SMUD TVA-Watts Bar TVA-Watts Bar/Sequoyah Wisconsin Elec-Pt Beach Foreign Almaraz-Spain CNV/G.E.-Spain Cofrentes/G.E.
-Spain Korea Elec-Kori II KRSKO-Slovenia Kuo Sheng/G.E.
Laguna Verde (HPCS)Laguna Verde-Units 1R2 Phillippines Zorita-Spain&#xb9;72-13000-100
&#xb9;72-05000-100
&#xb9;72-13000-100
<<72-03200-100
&#xb9;72-05000-100
&#xb9;72-00101-100
&#xb9;72-08300-100
&#xb9;72-05000-100
&#xb9;72-06204-100
&#xb9;72-06204-100
&#xb9;72-05000-100
&#xb9;72-05000-100
&#xb9;72-05000-100
&#xb9;72-05000-100
&#xb9;72-05000-100
&#xb9;72-05000-100
&#xb9;72-05000-100
&#xb9;72-01200-201S
&#xb9;72-05000-100
&#xb9;72-05000-100
&#xb9;72-05000-100
&#xb9;72-05100-100
&#xb9;72-13200-100
&#xb9;72-03100-100
&#xb9;72-05100-100
&#xb9;72-08400-100
&#xb9;72-05100-100
&#xb9;72>>05100-100
&#xb9;72-05100-100
&#xb9;72-05100-100
&#xb9;72-05100-100
&#xb9;72-05100-100
&#xb9;72-05100-100
&#xb9;72-05100-100
&#xb9;72-05100-100
&#xb9;72-01200-101
&#xb9;72-05100<<100
&#xb9;72-05100-100
&#xb9;72-05100-100 DRZ1KT Microscopic examination of the potentiometer showed foreign material on the surface and edge of the stationary slip-ring under the wiper arm collar.The material on the edge was translucent/white-ish and appeared to be a lubricant.
The material on the surface was blackish with some white flakes.It is postulated that the lubricate accumulated contaminants and/or dried on the surface.The total amount of foreign material is very small.
REPORT NO.10CFR21-0073 PAGE 3 OF 5 1)FP&L is in the process of updating their voltage regulators with the Maury potentiometer.
Other users should be aware of this possible problem and monitor their EDG output voltage for unstable output during routine testing.Replacement of the potentiometer is dependent upon monitoring/testing.
Immediate response to this notification does not appear to be necessary as the majority of the in-service voltage regulatozs have been operating without incident for approximately 15-20 years.2)The potentiometer is soldered to a circuit board within the voltage regulator assembly;therefore, field modification is not recommended.
For replacement of the potentiometer, it is recommended that the regulator be returned to NEI (either directly or through MKW Power Systems)where proper testing can be performed before the regulator is returned to the customer.Contact.MKW Parts Department for assistance.
If a regulator is to upgraded, we would also recommend replacement of the R5 (stability) potentiometer which is the same type as the R4 potentiometer except it is 100 ohms.The R5 potentiometer is CTS p/n 115R101A (NEI p/n 01070)and its replacement is Maury p/n 50-M123-101.


REPORT NO.10CFR21-0073 PAGE: 4 OF 5 EXHIBIT 1 (1 page attached)VOLTAGE ADJUST POTENTIOMETER"R4" NEI DRAWING A-01068 CHICAGO TELEPHONE COMPANY POTENTIOMETER 4115R251A  
REPORT NO. 10CFR21-0073 PAGE: 2 OF 5 U.ST Duke Power  Oconee          &#xb9;72-13000-100 FPRL  St. Lucie &#xb9;2          &#xb9;72-05000-100        &#xb9;72-05100-100 FPEL  Turkey Point          &#xb9;72-13000-100        &#xb9;72-13200-100 Grand Gulf                    <<72-03200-100        &#xb9;72-03100-100 Knolls Atomic - Kesselring    &#xb9;72-05000-100        &#xb9;72-05100-100 Portland G.E. Trogan        &#xb9;72-00101-100 PPEL  Susquehanna            &#xb9;72-08300-100        &#xb9;72-08400-100 SMUD                          &#xb9;72-05000-100        &#xb9;72-05100-100 TVA  - Watts Bar              &#xb9;72-06204-100        &#xb9;72>>05100-100 TVA  Watts Bar/Sequoyah      &#xb9;72-06204-100        &#xb9;72-05100-100 Wisconsin Elec  - Pt Beach  &#xb9;72-05000-100        &#xb9;72-05100-100 Foreign Almaraz  - Spain              &#xb9;72-05000-100        &#xb9;72-05100-100 CNV/G.E. Spain            &#xb9;72-05000-100        &#xb9;72-05100-100 Cofrentes/G.E. Spain        &#xb9;72-05000-100        &#xb9;72-05100-100 Korea Elec  Kori II          &#xb9;72-05000-100        &#xb9;72-05100-100 KRSKO  Slovenia              &#xb9;72-05000-100 Kuo Sheng/G.E.                &#xb9;72-05000-100        &#xb9;72-05100-100 Laguna Verde (HPCS)          &#xb9;72-01200-201S      &#xb9;72-01200-101 Laguna Verde  Units 1R2      &#xb9;72-05000-100        &#xb9;72-05100<<100 Phillippines                  &#xb9;72-05000-100        &#xb9;72-05100-100 Zorita - Spain                &#xb9;72-05000-100        &#xb9;72-05100-100 DRZ1KT Microscopic examination of the potentiometer showed foreign material on the surface and edge of the stationary slip-ring under the wiper arm collar. The material on the edge was translucent/white-ish and appeared to be a lubricant. The material on the surface was blackish with some white flakes. It is postulated that the lubricate accumulated contaminants and/or dried on the surface. The total amount of foreign material is very small.
~gr/v C.IIt Ivrr.r5~+<<4(5 r rrv TAIS.,IhI g i'TA A'74 Icrr;-i/Se.IS/g Cgrrw dirr4.TISSU XI IP+IS fib/m/>r, y.~g/rgb zi//-'.AS rpvATIAI.Pr/cr d.Cat IS'rr.I.r~~iJ~C.ortt IvrDp',rr+
 
I///i+Ii/hf III'ico.~/C+t iS/it SII.-.St<<Wu's/)SS+mPITIVrCO CTICCVIr Par/C:C Itrd 7 ES':/uwc,urr>gnrrdGI z5 A.zp/c carr Z.Ar rZCTuea Peer: 'WICABO rrC$ghOr/E@Vrouw.Y/rs/CZ$I 4 8./=vis.i zwcc.ossa I ousraucripr/'/IP$
REPORT NO. 10CFR21-0073 PAGE  3 OF 5
/P (Nlf~CS.C, OudCIC)Iw f/4 psstv At ATs.r g tcif~lccuNAc.y Al<<n'!CTTr Zz$ISroA'.I/nerrret.C', u/roc&run/O, 2$oA.~IATCIIIAL AI'I'I~~A~TITIOV DQ.ttOT.5CAlE.AI.I.DINSNSIONS ARC Itl IHOHIISo'Tht,CHANCE UNI CSS OTHCRWISC,SIICCIITHIDI DATC~T PIIATD~T', DATC CIICCACD~T P TC JIS.,//-Z/.fa: POBTEC.inc.Elsctrrc Prortucts'Controls Div.I VCD~T A~PAATIAC AVPCCA oroce ICACC ACV REPORT NO.10CFR21-0073 PAGE: 5 OF 5 EXHIBIT 2 (1 page attached)"R4" REPLACEMENT MAURY f50-M-123-251  
: 1) FP&L is in the process of updating their voltage regulators with the Maury potentiometer. Other users should be aware of this possible problem and monitor their EDG output voltage for unstable output during routine testing. Replacement of the potentiometer is dependent upon monitoring/testing.
~~~~~I~~~~~la~~
Immediate response to this notification does not appear to be necessary as the majority of the in-service voltage regulatozs have been operating without incident for approximately 15-20 years.
II If~I}}
: 2) The potentiometer is soldered to a circuit board within the voltage regulator assembly; therefore, field modification is not recommended. For replacement of the potentiometer, recommended that the regulator be returned to NEI (either it is directly or through MKW Power Systems) where proper testing can be performed before the regulator is returned to the customer. Contact. MKW Parts Department for assistance.
If a regulator is to upgraded, we would also recommend replacement of the R5 (stability) potentiometer which is the same type as the R4 potentiometer except  it is 100 ohms.
The R5 potentiometer is  CTS p/n  115R101A (NEI p/n 01070) and its replacement  is Maury p/n 50-M123-101.
 
REPORT NO. 10CFR21-0073 PAGE:  4 OF 5 EXHIBIT 1 (1 page attached)
VOLTAGE ADJUST POTENTIOMETER "R4" NEI DRAWING A-01068 CHICAGO TELEPHONE COMPANY POTENTIOMETER 4115R251A
 
XI
~
gr/v C.IIt Ivrr.
r5 ~ + <<4(5 r         Pr/cr d.Cat IS'rr.
                                                                                . r~~iJ~C .ortt IvrDp',rr+                             I///i+
III'ico.
I.TISSU Ii/hf
                                                                                                                                                                                            ~/C+
t Icrr; iS/it SII.-. St IS/
fib/
                                                                                                                                                                                                <<Wu's/)SS
                                -i/Se.                      g Cgrrw                        IS
                                                                                                                                      +   mPITIVrCO CTICCVIr Par/C:C dirr4            IP+              m/>r, y.
                                                                                    ~g/rgb zi//
Itrd 7 ES':
A'74                                                                          / uwc,urr     > gnrrdGI     z5 A.                       zp /     c       carr rrv TAIS.                        '. AS                                                        Z. Ar rZCTuea             Peer:
rpvATIAI.                                                                          rrC$ghOr/E 'WICABO
                                                                                                                                                                                  @Vrouw.Y
                        ,IhI
                                                                                                                                    /rs/CZ$ I 4 g
: 8. /=vis.i zwcc.ossa I                       ousraucripr/'/IP$
                                                                                                                                                /P i'TA
( Nlf ~     CS. C, OudCIC)
Iw   f/4     psstv At ATs.r g Al<<n'!CTTr tcif~ lccuNAc.y Zz$ ISroA'. I/nerrret.C', u/roc&run/O, 2$oA.
                                                                                    ~ IATCIIIAL PIIATD ~ T    ',    DATC    CIICCACD ~ T    P TC          VCD ~ T                        A ~        ICACC JIS.,          //-Z/.fa PAATIAC AVPCCA                                            ACV AI'I'I~ ~                             TITIOV                          DATC    ~T POBTEC A~
:                            .inc.
DQ. ttOT. 5CAlE. AI.I. DINSNSIONS Tht,CHANCE UNI ARC CSS OTHCRWISC,SIICCIITHIDI Itl  IHOHIISo' Elsctrrc Prortucts'Controls Div.I oroce
 
REPORT NO. 10CFR21-0073 PAGE: 5 OF 5 EXHIBIT 2 (1 page attached)
  "R4 " REPLACEMENT MAURY   f50-M-123-251
 
        ~ ~   ~
    ~ ~     I ~
~ ~                 ~ ~
la ~ ~
 
II If
  ~ I}}

Latest revision as of 21:23, 3 February 2020

Part 21 Rept 10CFR21-0073 Re Defect W/Voltage Adjust Potentiometer Mfg by Chicago Telephone Supply Used on NEI Peebles (Portec) Voltage Regulators at Plant.Util Updating Voltage Regulators W/Maury Instrument Corp Potentiometer
ML17353A614
Person / Time
Site: Turkey Point  NextEra Energy icon.png
Issue date: 02/28/1996
From: Nuding M
MKW POWER SYSTEMS, INC.
To: Hodge V
NRC
References
REF-PT21-96 10CFR21-0073, 10CFR21-73, NUDOCS 9603270295
Download: ML17353A614 (14)
v • d • e


Text

CATEGORY 1 REGULATOR'TNFORMRTION DISTRIBUTION %STEM. (RIDE)

ACt.F;4SIO>'BR:9603270295 DOC.DATE: 96/02/28 NOTARIZED: NO DOCKET ¹ FA('!L.:<," 250 Turkey Point Plant, Unit 3, Florida Power and Light C 05000250 50--251 Turkey Point Plant, Unit 4, Florida Power and Light C 05000251 AU"1'H.NAME AUTHOR AFFILIATION NUDING,M. MKW Power Systems, Inc.

REClk.NAME RECIPIENT AFFILIATION HODGE,V. NRC No Detailed Affiliation Given SUBJECT; Part 21 rept 10CFR21-0073 re defect w/voltage adjust potentiometer mfg by Chicago Telephone Supply used on NEI Peebles (Portec) voltage regulators at plant. Util updating voltage regulators w/Maury Instrument Corp potentiometer.

-~

DISTRIBUTION CODE: IE19T COPIES RECEIVED:LTR \ ENCL i SIZE:

TITLE: Part 21 Rept (50 DKT)

NOTES:

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD 1 1 CROTEAU,R 1 1 INTERN FILE CENTE 1 1 1 NRR/DRCH/HQMB 1 1 PM PECB 2 2 PDR WARD, M. 1 1 RES/DSIR/EIB 1 1 RGNl 1 1 RGN2 1 1 RGN3 1 1 RGN4 1 1 EXTERNAL: INPO RECORD CTR 1 1 NOAC SILVERFE 1 . 1 NRC PDR 1 1 NUDOCS FUI L TXT 1 1 D 0

", ~isoocus gscQ~<

ggse~~

NOTE TO ALL "RZDS" RECZPXENTS(

PLEASE HELP,US TO REDUCE WASTEI CONTACT THE DOCUMENT CONTROL DESK(

ROOM OWFN 5D"5(EXTe 415-2083) TO ELZMZNATE YOUR NAME FROM DXSTRXBUTZON LZSTS FOR DOCUMENTS YOU DON'T NEED!

I FULL ~EXT'ONVERSION R EQUIRED TOTA: NUMBER OF COP" ".S R!"QUJ RED: LTTR 16 ENCL 16

t MKW- o pgzl ~ jbz9o C

QlCI10 NOITrt 28 February, 1996 Vern Hodge USNRC Mail Stop 0-llA1 Washington, DC 20555

Reference:

Report No. 10CFR21-0073

Subject:

Reportable defect. with NEI voltage regulator voltage adjust potentiometer r

Dear Mr. Hodge:

MKW Power Systems'eport 10CFR21-0073 is attached which addzesses a 10CFR21 reportable. defect with the voltage, adjust potentiometer used on the NEI Peebles (Portec) voltage regulators. This was brought to our attention by FP6L - Turkey Point and we immediately began an investigation to determine the impact on other users of the same/similar ecpxipment. Our investigation was completed on 2/26/96.

Yours very truly, MKW POWER SYSTEMS, INC.

~i' Muo~g Michael Nuding General Manager Quality Assurance MN dg Enclosure 9603270295 960228 PDR AOOC(4, OSOOO2SOi S PDR lp('I Post Office Box 1928 ~ Rocky Mount, North Carolina 27802-1928 ~ Phone: (919) 9 -2720 TWX: (510) 929-0725 ~ FAX: (919) 446-3830

0 1

I

Report No. 10CFR21-0073 FEBRUARY 27~ 1996 10CFR21 REPORTING OF DEFECTS AND NON-COMPLIANCE COMPONENT: Chicago Telephone Supply (CTS), p/n 115R251A Voltage Ad)ust Potentiometer SYSTEM: Diesel Generator control systems with NEI Peebles (Portec) Voltage Regulators CONCLUSION: Defect is Reportable in Accordance with 10CFR21 PREPARED BY: DATE: ~ +/+~

Donald D Galeazzi Engineering Manager REVIENED BY DATE:

Michael Nudi g General Manager, Quality Assurance Post Office Box 1928 ~ Rocky Mount, North Carolina 27802-1928 ~ Phone: (919) 977-2720 TWX: (510) 929-0725 ~ FAX: (919) 446-3830

0 0 REPORT NO. 10CFR21-0073 PAGE 1 OF 5 MKW Power Systems witnessed repair and testing of a voltage regulator foz FPEL Turkey Point at NEI Peebles on 2/10/96 and 2/11/96. NEI manufactured many of the voltage regulators utilized in MKW's safety related diesel generators. Voltage instability was observed and was determined to be caused by foreign material on the stationary wiper portion of the R4 voltage adjust potentiometer. The potentiometer is 250 ohm, 2wg manufactured by Chicago Telephone Supply (CTS), p/n 115R251A and had been used by NEI for over twenty years for this application.

Because of availability problems, NEI replaced the CTS potentiometer with Mauzy Instrument Corporation p/n 50-M123-251 in 8/94). This is an enclosed precision wirewound potentiometer, 250 ohm, 1.5w, with a shaft locking nut. According to NEI, applied burden is 0.06w. When compared to the CTS component, the Mauzy is an upgrade in quality and appears to be less susceptible to contamination on the wiper surface. The FPEL zegulatoz had the R4 potentiometer replaced with the Mauxy part while at NEI and the voltage instability was corrected.

The purpose of the R4 potentiometer is to adjust generator voltage to rated value after installation of the remote voltage adjust motor operated potentiometer. This is normally a one-time adjustment which occurs during initial installation/startup of the EDG and is applicable to the automatic and manual (if used) voltage regulators.

MKW has been supplying NEI voltage regulators foz safety related EDG control systems since 1972. This incident and one prior in 1994 (FPEL EDG 4A and 4B respectively) are the only reported problems of this type; therefore, it is difficult to interpret this occurrence as a defect. In addition, because R4 is normally a one-time adjustment, any foreign material which develops/

accumulates on the wiper surface will not affect voltage regulator operation because it will not interfere with the wiper surface to wiper axm interface. It is recognized that this could cause problems if field adjustment of R4 is required; therefore, MKW Power Systems will notify all customers with NEI voltage regulators about this potential condition.

Chicago Telephone Supply (CTS), p/n 115R251A (NEI p/n 01068).

REPORT NO. 10CFR21-0073 PAGE: 2 OF 5 U.ST Duke Power Oconee ¹72-13000-100 FPRL St. Lucie ¹2 ¹72-05000-100 ¹72-05100-100 FPEL Turkey Point ¹72-13000-100 ¹72-13200-100 Grand Gulf <<72-03200-100 ¹72-03100-100 Knolls Atomic - Kesselring ¹72-05000-100 ¹72-05100-100 Portland G.E. Trogan ¹72-00101-100 PPEL Susquehanna ¹72-08300-100 ¹72-08400-100 SMUD ¹72-05000-100 ¹72-05100-100 TVA - Watts Bar ¹72-06204-100 ¹72>>05100-100 TVA Watts Bar/Sequoyah ¹72-06204-100 ¹72-05100-100 Wisconsin Elec - Pt Beach ¹72-05000-100 ¹72-05100-100 Foreign Almaraz - Spain ¹72-05000-100 ¹72-05100-100 CNV/G.E. Spain ¹72-05000-100 ¹72-05100-100 Cofrentes/G.E. Spain ¹72-05000-100 ¹72-05100-100 Korea Elec Kori II ¹72-05000-100 ¹72-05100-100 KRSKO Slovenia ¹72-05000-100 Kuo Sheng/G.E. ¹72-05000-100 ¹72-05100-100 Laguna Verde (HPCS) ¹72-01200-201S ¹72-01200-101 Laguna Verde Units 1R2 ¹72-05000-100 ¹72-05100<<100 Phillippines ¹72-05000-100 ¹72-05100-100 Zorita - Spain ¹72-05000-100 ¹72-05100-100 DRZ1KT Microscopic examination of the potentiometer showed foreign material on the surface and edge of the stationary slip-ring under the wiper arm collar. The material on the edge was translucent/white-ish and appeared to be a lubricant. The material on the surface was blackish with some white flakes. It is postulated that the lubricate accumulated contaminants and/or dried on the surface. The total amount of foreign material is very small.

REPORT NO. 10CFR21-0073 PAGE 3 OF 5

1) FP&L is in the process of updating their voltage regulators with the Maury potentiometer. Other users should be aware of this possible problem and monitor their EDG output voltage for unstable output during routine testing. Replacement of the potentiometer is dependent upon monitoring/testing.

Immediate response to this notification does not appear to be necessary as the majority of the in-service voltage regulatozs have been operating without incident for approximately 15-20 years.

2) The potentiometer is soldered to a circuit board within the voltage regulator assembly; therefore, field modification is not recommended. For replacement of the potentiometer, recommended that the regulator be returned to NEI (either it is directly or through MKW Power Systems) where proper testing can be performed before the regulator is returned to the customer. Contact. MKW Parts Department for assistance.

If a regulator is to upgraded, we would also recommend replacement of the R5 (stability) potentiometer which is the same type as the R4 potentiometer except it is 100 ohms.

The R5 potentiometer is CTS p/n 115R101A (NEI p/n 01070) and its replacement is Maury p/n 50-M123-101.

REPORT NO. 10CFR21-0073 PAGE: 4 OF 5 EXHIBIT 1 (1 page attached)

VOLTAGE ADJUST POTENTIOMETER "R4" NEI DRAWING A-01068 CHICAGO TELEPHONE COMPANY POTENTIOMETER 4115R251A

XI

~

gr/v C.IIt Ivrr.

r5 ~ + <<4(5 r Pr/cr d.Cat IS'rr.

. r~~iJ~C .ortt IvrDp',rr+ I///i+

III'ico.

I.TISSU Ii/hf

~/C+

t Icrr; iS/it SII.-. St IS/

fib/

<<Wu's/)SS

-i/Se. g Cgrrw IS

+ mPITIVrCO CTICCVIr Par/C:C dirr4 IP+ m/>r, y.

~g/rgb zi//

Itrd 7 ES':

A'74 / uwc,urr > gnrrdGI z5 A. zp / c carr rrv TAIS. '. AS Z. Ar rZCTuea Peer:

rpvATIAI. rrC$ghOr/E 'WICABO

@Vrouw.Y

,IhI

/rs/CZ$ I 4 g

8. /=vis.i zwcc.ossa I ousraucripr/'/IP$

/P i'TA

( Nlf ~ CS. C, OudCIC)

Iw f/4 psstv At ATs.r g Al<<n'!CTTr tcif~ lccuNAc.y Zz$ ISroA'. I/nerrret.C', u/roc&run/O, 2$oA.

~ IATCIIIAL PIIATD ~ T ', DATC CIICCACD ~ T P TC VCD ~ T A ~ ICACC JIS., //-Z/.fa PAATIAC AVPCCA ACV AI'I'I~ ~ TITIOV DATC ~T POBTEC A~

.inc.

DQ. ttOT. 5CAlE. AI.I. DINSNSIONS Tht,CHANCE UNI ARC CSS OTHCRWISC,SIICCIITHIDI Itl IHOHIISo' Elsctrrc Prortucts'Controls Div.I oroce

REPORT NO. 10CFR21-0073 PAGE: 5 OF 5 EXHIBIT 2 (1 page attached)

"R4 " REPLACEMENT MAURY f50-M-123-251

~ ~ ~

~ ~ I ~

~ ~ ~ ~

la ~ ~

II If

~ I

Retrieved from "https://kanterella.com/w/index.php?title=ML17353A614&oldid=2422637"