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{{#Wiki_filter:pl05/08/2014 U.S. Nuclear Regulatory Commission Operations Center Event Report Page IPart 21 (PAR) Event # 50096Rep Org: SCIENTECH Notification Date I Time: 05/08/2014 14:57 (EDT)Supplier:
{{#Wiki_filter:pl 05/08/2014 U.S. Nuclear Regulatory Commission Operations Center Event Report Page I Part 21 (PAR) Event # 50096 Rep Org: SCIENTECH Notification Date I Time: 05/08/2014 14:57 (EDT)Supplier:
SCIENTECH Event Date I Time: 05/07/2014 (MDT)Last Modification:
SCIENTECH Event Date I Time: 05/07/2014 (MDT)Last Modification:
05/08/2014 Region: 4 Docket #:City: IDAHO FALLS Agreement State: NoCounty: License #:State: IDNRC Notified by: VINCENT CHERMAK Notifications:
05/08/2014 Region: 4 Docket #: City: IDAHO FALLS Agreement State: No County: License #: State: ID NRC Notified by: VINCENT CHERMAK Notifications:
JOHNATHAN LILLIENDAHL RIDOHQ Ops Officer:
JOHNATHAN LILLIENDAHL RIDO HQ Ops Officer: STEVE SANDIN KENNETH RIEMER R3DO Emergency Class: NON EMERGENCY JACK WHITTEN R4DO 10 CFR Section: NRR PART 21 EMAIL 21.21 (d)(3)(i)
STEVE SANDIN KENNETH RIEMER R3DOEmergency Class: NON EMERGENCY JACK WHITTEN R4DO10 CFR Section:
DEFECTS AND NONCOMPLIANCE PART 21 -POTENTIAL DEFECT IN NUS-710DU TRIP UNIT TO PRODUCE A VALID TRIP OUTPUT SIGNAL The following summary was provided by Curtiss-Wright Flow Control Corporation: "In certain operating configurations, NUS-710DU Trip Units could fail to produce a valid trip output signal."Transistor Q8 on the referenced units uses a TO-66 package and is flush mounted on the component side of the PCB. The TO-66 package, based on JDEC drawing TO-213 does not specify the size of the glass-sealed holes in the case (collector) around the base and emitter leads. Random samples measure approximately 0.11" in diameter.
NRR PART 21 EMAIL21.21 (d)(3)(i)
The PCB includes standard 0.100" solder pads on both non-component and component sides. During manufacture, Q8 is secured using screws and nuts with leads centered in the through-holes, so no direct solder pad to case contact is possible.
DEFECTS AND NONCOMPLIANCE PART 21 -POTENTIAL DEFECT IN NUS-710DU TRIP UNIT TO PRODUCE A VALID TRIP OUTPUT SIGNALThe following summary was provided by Curtiss-Wright Flow Control Corporation:
However, the presence of the pad on the component side could facilitate, under certain conditions, excessive solder flow, creating a close proximity, or in the extreme case bridging, between solder on the emitter or base solder pad and the Q8 case. Permanent bridging would be detected during acceptance testing. However, in at least one case, with the trip unit mounted in the trip unit chassis via an extender card, the proximity was close enough to create contact when the board was slightly flexed."The trip units have two modes of operation, NORM and REV, selectable by switch S2, and four operating configurations:  
"In certain operating configurations, NUS-710DU Trip Units could fail to produce a valid trip output signal."Transistor Q8 on the referenced units uses a TO-66 package and is flush mounted on the component side of thePCB. The TO-66 package, based on JDEC drawing TO-213 does not specify the size of the glass-sealed holes inthe case (collector) around the base and emitter leads. Random samples measure approximately 0.11" indiameter.
(1) NORM mode, rising trip, energize on trip, (2) REV mode, falling trip, energize on trip, (3) NORM mode, falling trip, de-energize on trip and (4) REV mode, rising trip, de-energize on trip."In configuration (1), the set point is applied to the negative terminal of a comparator and the input is applied to the positive terminal.
The PCB includes standard 0.100" solder pads on both non-component and component sides. Duringmanufacture, Q8 is secured using screws and nuts with leads centered in the through-holes, so no direct solderpad to case contact is possible.  
When the input rises above the set point, the output of the comparator goes to the positive rail, turning on Q7. When Q7 turns on, it pulls the base of Q8 low, causing Q8 to turn on. When Q8 turns on, the trip output goes to approximately  
: However, the presence of the pad on the component side could facilitate, undercertain conditions, excessive solder flow, creating a close proximity, or in the extreme case bridging, betweensolder on the emitter or base solder pad and the Q8 case. Permanent bridging would be detected duringacceptance testing.  
: However, in at least one case, with the trip unit mounted in the trip unit chassis via an extendercard, the proximity was close enough to create contact when the board was slightly flexed."The trip units have two modes of operation, NORM and REV, selectable by switch S2, and four operating configurations:  
(1) NORM mode, rising trip, energize on trip, (2) REV mode, falling trip, energize on trip, (3) NORMmode, falling trip, de-energize on trip and (4) REV mode, rising trip, de-energize on trip."In configuration (1), the set point is applied to the negative terminal of a comparator and the input is applied to thepositive terminal.
When the input rises above the set point, the output of the comparator goes to the positive rail,turning on Q7. When Q7 turns on, it pulls the base of Q8 low, causing Q8 to turn on. When Q8 turns on, the tripoutput goes to approximately  
+24V.
+24V.
w05/08/2014 U.S. Nuclear Regulatory Commission Operations Center Event Report Page 2"In configuration (2), the set point is applied to the positive terminal of the comparator and the input is applied to thenegative terminal.
w 05/08/2014 U.S. Nuclear Regulatory Commission Operations Center Event Report Page 2"In configuration (2), the set point is applied to the positive terminal of the comparator and the input is applied to the negative terminal.
When the input drops below the set point, the output of the comparator goes to the positive railand turns on Q8, resulting in a trip output of approximately  
When the input drops below the set point, the output of the comparator goes to the positive rail and turns on Q8, resulting in a trip output of approximately  
+24V."In configurations (1) and (2), bridging at Q8 would cause an output trip signal."In configuration (3), when the input drops below the reset point, the output of the comparator goes to the negativerail, which causes Q8 to turn off. When Q8 turns off, the trip output goes to approximately zero volts."In configuration (4), when the input rises above the reset point, the output of the comparator goes to the negativerail and turns off Q8, de-energizing the unit output."In configurations (3) and (4), bridging at Q8 would prevent a valid trip signal from being generated by keeping theoutput at logic high."Plant: Limerick/Part Number: NUS-710DUOTS/Quantity:
+24V."In configurations (1) and (2), bridging at Q8 would cause an output trip signal."In configuration (3), when the input drops below the reset point, the output of the comparator goes to the negative rail, which causes Q8 to turn off. When Q8 turns off, the trip output goes to approximately zero volts."In configuration (4), when the input rises above the reset point, the output of the comparator goes to the negative rail and turns off Q8, de-energizing the unit output."In configurations (3) and (4), bridging at Q8 would prevent a valid trip signal from being generated by keeping the output at logic high."Plant: Limerick/Part Number: NUS-710DUOTS/Quantity:
2/Serial Numbers:
2/Serial Numbers: 1303582, 1303583"Plant: Limerick/Part Number: NUS-710DUOTT27000/Quantity:
: 1303582, 1303583"Plant: Limerick/Part Number: NUS-710DUOTT27000/Quantity:
6/Serial Numbers: 1304197, 1304198,1304199, 1304200,1304201,1304202"Plant: Columbia/Part Number: NUS-710DUOTT45059/Quantity:
6/Serial Numbers:
5/Serial Numbers: 1303632, 1303633, 1303634, 1303635,1303636"Plant: Grand Gulf/Part Number: NUS-710DUOTT27000/Quantity:
: 1304197, 1304198,1304199, 1304200,1304201,1304202 "Plant: Columbia/Part Number: NUS-710DUOTT45059/Quantity:
3/Serial Numbers: 1303672, 1303673, 1303674"Plant: Perry/Part Number: NUS-710DUOTT27000/Quantity:
5/Serial Numbers:
33/Serial Numbers: 1304219, 1304220, 1304221, 1304222, 1304223, 1304224, 1304225,1304226,1304227,1304228,1304229,1304230,1304231, 1304232, 1304233, 1304234,1304235,1304236,1304237, 1304238, 1304239, 1304240,1304241, 1304242, 1304243, 1304244,1304245,1304246,1304247,1304248,1304249,1304250, 1304251."Should you have any questions regarding this matter, please contact Robert Queenan, Division Manager, Scientech/Instrumentation and Controls, at (208) 524-9311."
: 1303632, 1303633, 1303634,1303635,1303636 "Plant: Grand Gulf/Part Number: NUS-710DUOTT27000/Quantity:
3/Serial Numbers:
: 1303672, 1303673, 1303674"Plant: Perry/Part Number: NUS-710DUOTT27000/Quantity:
33/Serial Numbers:
: 1304219, 1304220, 1304221,1304222,  
: 1304223, 1304224, 1304225,1304226,1304227,1304228,1304229,1304230,1304231, 1304232,1304233, 1304234,1304235,1304236,1304237,  
: 1304238, 1304239, 1304240,1304241,  
: 1304242, 1304243,1304244,1304245,1304246,1304247,1304248,1304249,1304250, 1304251."Should you have any questions regarding this matter, please contact Robert Queenan, Division Manager,Scientech/Instrumentation and Controls, at (208) 524-9311."
Inslnimentation  
Inslnimentation  
& Controls DivisionCU R 200 S. Woodruff Ave.RIGIdaho Falls, ID 83401(208) 529-1000May 8"' 2014 Letter Number: AVC-14-005 Attn: Document Control DeskU.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001
& Controls Division CU R 200 S. Woodruff Ave.RIGIdaho Falls, ID 83401 (208) 529-1000 May 8"' 2014 Letter Number: AVC-14-005 Attn: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001


==Subject:==
==Subject:==
 
10 CFR Part 21 Report Notification, NUS71 ODU Trip Units  
10 CFR Part 21 Report Notification, NUS71 ODU Trip Units


==Dear Sir or Madam:==
==Dear Sir or Madam:==
The purpose of this letter is to notify the Nuclear Regulatory Commission of a defect. In certain operating configurations, NUS-7 1 ODU Trip Units could fail to produce a valid trip output signal. Details of the defect areprovided below.I-l" IL ( ! R Al 12 ( 1(O ) : I wrIIIlc t cIquil C V thitIlls paril. aph ,hal incltudc.
The purpose of this letter is to notify the Nuclear Regulatory Commission of a defect. In certain operating configurations, NUS-7 1 ODU Trip Units could fail to produce a valid trip output signal. Details of the defect are provided below.I-l" IL ( ! R Al 12 ( 1(O ) : I wrIIIlc t cIquil C V thitIlls paril. aph ,hal incltudc.
but lit:cd mit hc hililtcd to.II( (I.iloýý Ilt\ 1 ['Ornlatin, to til. -a eNtc\ lm kllo\\ 1(I0 N'1 1 t d Im l c fII. c I Ih i uh, , i r m Idi, 6dual , 1 in hw 1i1g, 1hc (0h111i.1.,1i0o  
but lit:cd mit hc hililtcd to.II( (I.iloýý Ilt\ 1 ['Ornlatin, to til. -a eNtc\ lm kllo\\ 1 (I0 N'1 1 t d Im l c fII. c I Ih i uh, , i r m Idi, 6dual , 1 in hw 1i1g, 1hc (0h111i.1.,1i0o  
.AV ChermakQuality ManagerScientech, a business unit of Curtiss-Wright Flow Control Corporation 200 S Woodruff AvenueIdaho Falls, Idaho 83401Dan MeilsGeneral ManagerScientech, a business unit of Curtiss-Wright Flow Control Corporation 29399 US Hwy 19 North, Suite 320Clearwater, FL 33761(it) idctiillcallon ac h :ila , 1t1 JClmmti 01 .cmr Cl111 1)asic c 1mpc 0c 1. suppiliCd olw such (hcility Or such 3cti )it'\% itl111 11 1C I i >,ir h ý, J > ,i xIch hmiý;S hi cc1i111)In N (w coin lwti1i a dIccfciNUS-7 10DUOTT; A Master Trip Unit manufactured by Scientech.
.AV Chermak Quality Manager Scientech, a business unit of Curtiss-Wright Flow Control Corporation 200 S Woodruff Avenue Idaho Falls, Idaho 83401 Dan Meils General Manager Scientech, a business unit of Curtiss-Wright Flow Control Corporation 29399 US Hwy 19 North, Suite 320 Clearwater, FL 33761 (it) idctiillcallon ac h :ila , 1t1 JClmmti 01 .cmr Cl111 1)asic c 1mpc 0c 1. suppiliCd olw such (hcility Or such 3cti )it'\% itl111 11 1C I i >,ir h ý, J > ,i xIch hmiý;S hi cc1i111)In N (w coin lwti1i a dIccfci NUS-7 10DUOTT; A Master Trip Unit manufactured by Scientech.
NUS-7 1 ODUOTS; A Slave Trip Unit manufactured by Scientech.
NUS-7 1 ODUOTS; A Slave Trip Unit manufactured by Scientech.
liii) hint'ilcaic;on i* Ir firm coin iract inu, fhic lalcihii3 c suppiyvinigI h1c basic collin)olcflt w hich tails to comply oiScientech, a business unit of Curtiss-Wright Flow Control Corporation 200 S Woodruff AvenueIdaho Falls, ID 83401 Instrumentation  
liii) hint'ilcaic;on i* Ir firm coin iract inu, fhic lalcihii3 c suppiyvinigI h1c basic collin)olcflt w hich tails to comply oi Scientech, a business unit of Curtiss-Wright Flow Control Corporation 200 S Woodruff Avenue Idaho Falls, ID 83401 Instrumentation  
& Controls DivisionCURTISS200 S. Woodruff Ave.Idaho Falls, ID 83401WRIGHT ,(208) 529-1000{iv) N;itult ot'flic dcicclt or Iailure to (oniply aild lhc salctI haard which is crcalcd or could bK cr-catled bY stluchIailurc, 'ouilv/t.
& Controls Division CURTISS200 S. Woodruff Ave.Idaho Falls, ID 83401 WRIGHT , (208) 529-1000{iv) N;itult ot'flic dcicclt or Iailure to (oniply aild lhc salctI haard which is crcalcd or could bK cr-catled bY stluchIailurc, 'ouilv/t.In certain operating configurations, NUS-710DU Trip Units could fail to produce a valid trip output signal.E Glass seal around lead S Thru hole for solder fiow Transistor Q8 on the referenced units uses a TO-66 package and is flush mounted on the component side of the PCB. The TO-66 package, based on JDEC drawing TO-213 does not specify the size of the glass-sealed holes in the case (collector) around the base and emitter leads. Random samples measure approximately 0.11" in diameter.The PCB includes standard 0.100" solder pads on both non-component and component sides. During manufacture, Q8 is secured using screws and nuts with leads centered in the through-holes, so no direct solder pad to case contact is possible.
In certain operating configurations, NUS-710DU Trip Units could fail to produce a valid trip output signal.E Glass seal around leadS Thru hole for solder fiowTransistor Q8 on the referenced units uses a TO-66 package and is flush mounted on the component side of thePCB. The TO-66 package, based on JDEC drawing TO-213 does not specify the size of the glass-sealed holes inthe case (collector) around the base and emitter leads. Random samples measure approximately 0.11" in diameter.
However, the presence of the pad on the component side could facilitate, under certain conditions, excessive solder flow, creating a close proximity, or in the extreme case bridging, between solder on the emitter or base solder pad and the Q8 case. Permanent bridging would be detected during acceptance testing.However, in at least one case, with the trip unit mounted in the trip unit chassis via an extender card, the proximity was close enough to create contact when the board was slightly flexed.The trip units have two modes of operation, NORM and REV, selectable by switch S2, and four operating configurations:  
The PCB includes standard 0.100" solder pads on both non-component and component sides. Duringmanufacture, Q8 is secured using screws and nuts with leads centered in the through-holes, so no direct solder padto case contact is possible.  
(1) NORM mode, rising trip, energize on trip, (2) REV mode, falling trip, energize on trip, (3)NORM mode, falling trip, de-energize on trip and (4) REV mode, rising trip, de-energize on trip.In configuration (1), the set point is applied to the negative terminal of a comparator and the input is applied to the positive terminal.
: However, the presence of the pad on the component side could facilitate, under certainconditions, excessive solder flow, creating a close proximity, or in the extreme case bridging, between solder onthe emitter or base solder pad and the Q8 case. Permanent bridging would be detected during acceptance testing.However, in at least one case, with the trip unit mounted in the trip unit chassis via an extender card, theproximity was close enough to create contact when the board was slightly flexed.The trip units have two modes of operation, NORM and REV, selectable by switch S2, and four operating configurations:  
When the input rises above the set point, the output of the comparator goes to the positive rail, turning on Q7. When Q7 turns on, it pulls the base of Q8 low, causing Q8 to turn on. When Q8 turns on, the trip output goes to approximately  
(1) NORM mode, rising trip, energize on trip, (2) REV mode, falling trip, energize on trip, (3)NORM mode, falling trip, de-energize on trip and (4) REV mode, rising trip, de-energize on trip.In configuration (1), the set point is applied to the negative terminal of a comparator and the input is applied to thepositive terminal.
+24V.In configuration (2), the set point is applied to the positive terminal of the comparator and the input is applied to the negative terminal.
When the input rises above the set point, the output of the comparator goes to the positive rail,turning on Q7. When Q7 turns on, it pulls the base of Q8 low, causing Q8 to turn on. When Q8 turns on, the tripoutput goes to approximately  
When the input drops below the set point, the output of the comparator goes to the positive rail and turns on Q8, resulting in a trip output of approximately  
+24V.In configuration (2), the set point is applied to the positive terminal of the comparator and the input is applied tothe negative terminal.
+24V.In configurations (1) and (2), bridging at Q8 would cause an output trip signal.In configuration (3), when the input drops below the reset point, the output of the comparator goes to the negative rail, which causes Q8 to turn off. When Q8 turns off, the trip output goes to approximately zero volts.In configuration (4), when the input rises above the reset point, the output of the comparator goes to the negative rail and turns off Q8, de-energizing the unit output.
When the input drops below the set point, the output of the comparator goes to the positiverail and turns on Q8, resulting in a trip output of approximately  
CURTISS -WRIGHT Instrumentation
+24V.In configurations (1) and (2), bridging at Q8 would cause an output trip signal.In configuration (3), when the input drops below the reset point, the output of the comparator goes to the negativerail, which causes Q8 to turn off. When Q8 turns off, the trip output goes to approximately zero volts.In configuration (4), when the input rises above the reset point, the output of the comparator goes to the negativerail and turns off Q8, de-energizing the unit output.
& Controls Division 200 S. Woodruff Ave.Idaho Falls, ID 83401 (208) 529-1000 In configurations (3) and (4), bridging at Q8 would prevent a valid trip signal from being generated by keeping the output at logic high.Submitted for evaluation 4/29/2014.
CURTISS -WRIGHTInstrumentation
The evaluation was completed on 5/7/2014 In ti h ~.c 1 1 a .mý 1/4nOl U 10 11 ~ k% 1 CII cuilidlnm, dol"Cct 01 fkýIjIS h c ni tI)C illItIM-c dilid oa I OCA ci li 01 OW III tl~c ilt. .uIpphc (I0ic., KiI¶ sippiicdI fl. )I- ltiiv hI' stippj)I 1d 0r, 1t1antiliactille~d.
& Controls Division200 S. Woodruff Ave.Idaho Falls, ID 83401(208) 529-1000In configurations (3) and (4), bridging at Q8 would prevent a valid trip signal from being generated by keepingthe output at logic high.Submitted for evaluation 4/29/2014.
Of 'Plant Part Number Quantity Serial Numbers NUS-710DUOTS 2 1303582, 1303583 Limerick NUS-710DUOTT27000 6 1304197, 1304198, 1304199, 1304200, 1304201, 1304202 Columbia NUS-710DUOTT45059 5 1303632, 1303633, 1303634, 1303635, 1303636 Grand Gulf NUS-7 I ODUOTT27000 3 1303672, 1303673, 1303674 1304219, 1304220, 1304221, 1304222, 1304223, 1304224, 1304225, 1304226, 1304227, 1304228, 1304229, 1304230, 1304231, 1304232, 1304233, Perry NUS-710DUOTT27000 33 1304234, 1304235, 1304236, 1304237, 1304238, 1304239, 1304240, 1304241, 1304242, 1304243, 1304244, 1304245, 1304246, 1304247, 1304248, 1304249, 1304250, 1304251 ( I I Ih 1CcI I I (l : t I)i I x i%\ h Ih I 1; 1x bcct 'I 1.1 I' I IIsiO w h I I I kbe ta n ,ld Wic o t hei in ilid uni I(m orI ;) lflh 111iOll 101-~K i u 16c1 lcflol. ;111(1 ht leIgth l 11111c,~ that ha~s hccni Or W~ill be t.akn io conipilei ilhe act ion.1. Scientech has identified a design change that corrects the problem. The correction is to install spacers under Q8 to provide clearance from the board. The Design Change Notice was complete May 7, 2014.2. Scientech has placed a hold on all affected in-house modules, and will incorporate the design change prior to ship.3. Scientech will notify the plants listed per 21.21(d)(4)(vi) above, and offer to correct the affected units at Scientech's facility by close of business May 8, 2014.
The evaluation was completed on 5/7/2014In ti h ~.c 1 1 a .mý 1/4nOl U 10 11 ~ k% 1 CII cuilidlnm, dol"Cct 01 fkýIjIS h c ni tI)C illItIM-c dilid oa I OCA ci li 01 OWIII tl~c ilt. .uIpphc (I0ic., KiI¶ sippiicdI fl. )I- ltiiv hI' stippj)I 1d 0r, 1t1antiliactille~d.
CURTISS -WRIGHT Instrumentation
Of 'Plant Part Number Quantity Serial NumbersNUS-710DUOTS 2 1303582, 1303583LimerickNUS-710DUOTT27000 6 1304197,  
& Controls Division 200 S. Woodruff Ave.Idaho Falls, ID 83401 (208) 529-1000 1% iii) Any advice reiated to the defect or lhilure to comply about tlie rtcility.
: 1304198, 1304199,  
actli Iy. or basic Component dhat has hecin, is hci,, or will bc givei to ptrc hasers or licensees.
: 1304200, 1304201,1304202Columbia NUS-710DUOTT45059 5 1303632,  
: 1303633, 1303634,  
: 1303635, 1303636Grand Gulf NUS-7 I ODUOTT27000 3 1303672,  
: 1303673, 13036741304219,  
: 1304220, 1304221,  
: 1304222, 1304223,1304224,  
: 1304225, 1304226,  
: 1304227, 1304228,1304229,  
: 1304230, 1304231,  
: 1304232, 1304233,Perry NUS-710DUOTT27000 33 1304234,  
: 1304235, 1304236,  
: 1304237, 1304238,1304239,  
: 1304240, 1304241,  
: 1304242, 1304243,1304244,  
: 1304245, 1304246,  
: 1304247, 1304248,1304249,  
: 1304250, 1304251( I I Ih 1CcI I I (l : t I)i I x i%\ h Ih I 1; 1x bcct 'I 1.1 I' I IIsiO w h I I I kbe ta n ,ld Wic o t hei in ilid uni I(m orI ;) lflh 111iOll101-~K i u 16c1 lcflol. ;111(1 ht leIgth l 11111c,~
that ha~s hccni Or W~ill be t.akn io conipilei ilhe act ion.1. Scientech has identified a design change that corrects the problem.
The correction is to install spacersunder Q8 to provide clearance from the board. The Design Change Notice was complete May 7, 2014.2. Scientech has placed a hold on all affected in-house  
: modules, and will incorporate the design change priorto ship.3. Scientech will notify the plants listed per 21.21(d)(4)(vi) above, and offer to correct the affected units atScientech's facility by close of business May 8, 2014.
CURTISS -WRIGHTInstrumentation
& Controls Division200 S. Woodruff Ave.Idaho Falls, ID 83401(208) 529-10001% iii) Any advice reiated to the defect or lhilure to comply about tlie rtcility.
actli Iy. or basic Component dhat hashecin, is hci,, or will bc givei to ptrc hasers or licensees.
None.(ix) III thC case okan1 earls site permit. the entities lo whom an Carly siic permit wa,, transte'rrcd Not applicable.
None.(ix) III thC case okan1 earls site permit. the entities lo whom an Carly siic permit wa,, transte'rrcd Not applicable.
Should you have any questions regarding this matter, please contact Robert Queenan, Division Manager,Scientech/Instrumentation and Controls, at (208) 524-9311.
Should you have any questions regarding this matter, please contact Robert Queenan, Division Manager, Scientech/Instrumentation and Controls, at (208) 524-9311.A Vincent Chermak, SSBB, PMP Quality Assurance Manager I&C Division Scientech, a business unit of Curtiss-Wright Flow Control Company Office (208) 524-9202 1 Fax (208) 524-9238 Cc: Dan Meils Robert Queenan John McGimpsey Michael Weinstein QA File}}
A Vincent Chermak, SSBB, PMPQuality Assurance ManagerI&C DivisionScientech, a business unit of Curtiss-Wright Flow Control CompanyOffice (208) 524-9202 1 Fax (208) 524-9238Cc: Dan MeilsRobert QueenanJohn McGimpsey Michael Weinstein QA File}}

Revision as of 15:54, 9 July 2018

Part 21 - Potential Defect in NUS-710DU Trip Unit to Produce a Valid Trip Output Signal
ML14134A079
Person / Time
Site: Perry, Grand Gulf, Columbia, Limerick  Constellation icon.png
Issue date: 05/08/2014
From: Chermak V
Curtiss-Wright Flow Control Corp, SCIENTECH
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
AVC-14-005
Download: ML14134A079 (6)
v • d • e


Text

pl 05/08/2014 U.S. Nuclear Regulatory Commission Operations Center Event Report Page I Part 21 (PAR) Event # 50096 Rep Org: SCIENTECH Notification Date I Time: 05/08/2014 14:57 (EDT)Supplier:

SCIENTECH Event Date I Time: 05/07/2014 (MDT)Last Modification:

05/08/2014 Region: 4 Docket #: City: IDAHO FALLS Agreement State: No County: License #: State: ID NRC Notified by: VINCENT CHERMAK Notifications:

JOHNATHAN LILLIENDAHL RIDO HQ Ops Officer: STEVE SANDIN KENNETH RIEMER R3DO Emergency Class: NON EMERGENCY JACK WHITTEN R4DO 10 CFR Section: NRR PART 21 EMAIL 21.21 (d)(3)(i)

DEFECTS AND NONCOMPLIANCE PART 21 -POTENTIAL DEFECT IN NUS-710DU TRIP UNIT TO PRODUCE A VALID TRIP OUTPUT SIGNAL The following summary was provided by Curtiss-Wright Flow Control Corporation: "In certain operating configurations, NUS-710DU Trip Units could fail to produce a valid trip output signal."Transistor Q8 on the referenced units uses a TO-66 package and is flush mounted on the component side of the PCB. The TO-66 package, based on JDEC drawing TO-213 does not specify the size of the glass-sealed holes in the case (collector) around the base and emitter leads. Random samples measure approximately 0.11" in diameter.

The PCB includes standard 0.100" solder pads on both non-component and component sides. During manufacture, Q8 is secured using screws and nuts with leads centered in the through-holes, so no direct solder pad to case contact is possible.

However, the presence of the pad on the component side could facilitate, under certain conditions, excessive solder flow, creating a close proximity, or in the extreme case bridging, between solder on the emitter or base solder pad and the Q8 case. Permanent bridging would be detected during acceptance testing. However, in at least one case, with the trip unit mounted in the trip unit chassis via an extender card, the proximity was close enough to create contact when the board was slightly flexed."The trip units have two modes of operation, NORM and REV, selectable by switch S2, and four operating configurations:

(1) NORM mode, rising trip, energize on trip, (2) REV mode, falling trip, energize on trip, (3) NORM mode, falling trip, de-energize on trip and (4) REV mode, rising trip, de-energize on trip."In configuration (1), the set point is applied to the negative terminal of a comparator and the input is applied to the positive terminal.

When the input rises above the set point, the output of the comparator goes to the positive rail, turning on Q7. When Q7 turns on, it pulls the base of Q8 low, causing Q8 to turn on. When Q8 turns on, the trip output goes to approximately

+24V.

w 05/08/2014 U.S. Nuclear Regulatory Commission Operations Center Event Report Page 2"In configuration (2), the set point is applied to the positive terminal of the comparator and the input is applied to the negative terminal.

When the input drops below the set point, the output of the comparator goes to the positive rail and turns on Q8, resulting in a trip output of approximately

+24V."In configurations (1) and (2), bridging at Q8 would cause an output trip signal."In configuration (3), when the input drops below the reset point, the output of the comparator goes to the negative rail, which causes Q8 to turn off. When Q8 turns off, the trip output goes to approximately zero volts."In configuration (4), when the input rises above the reset point, the output of the comparator goes to the negative rail and turns off Q8, de-energizing the unit output."In configurations (3) and (4), bridging at Q8 would prevent a valid trip signal from being generated by keeping the output at logic high."Plant: Limerick/Part Number: NUS-710DUOTS/Quantity:

2/Serial Numbers: 1303582, 1303583"Plant: Limerick/Part Number: NUS-710DUOTT27000/Quantity:

6/Serial Numbers: 1304197, 1304198,1304199, 1304200,1304201,1304202"Plant: Columbia/Part Number: NUS-710DUOTT45059/Quantity:

5/Serial Numbers: 1303632, 1303633, 1303634, 1303635,1303636"Plant: Grand Gulf/Part Number: NUS-710DUOTT27000/Quantity:

3/Serial Numbers: 1303672, 1303673, 1303674"Plant: Perry/Part Number: NUS-710DUOTT27000/Quantity:

33/Serial Numbers: 1304219, 1304220, 1304221, 1304222, 1304223, 1304224, 1304225,1304226,1304227,1304228,1304229,1304230,1304231, 1304232, 1304233, 1304234,1304235,1304236,1304237, 1304238, 1304239, 1304240,1304241, 1304242, 1304243, 1304244,1304245,1304246,1304247,1304248,1304249,1304250, 1304251."Should you have any questions regarding this matter, please contact Robert Queenan, Division Manager, Scientech/Instrumentation and Controls, at (208) 524-9311."

Inslnimentation

& Controls Division CU R 200 S. Woodruff Ave.RIGIdaho Falls, ID 83401 (208) 529-1000 May 8"' 2014 Letter Number: AVC-14-005 Attn: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001

Subject:

10 CFR Part 21 Report Notification, NUS71 ODU Trip Units

Dear Sir or Madam:

The purpose of this letter is to notify the Nuclear Regulatory Commission of a defect. In certain operating configurations, NUS-7 1 ODU Trip Units could fail to produce a valid trip output signal. Details of the defect are provided below.I-l" IL ( ! R Al 12 ( 1(O ) : I wrIIIlc t cIquil C V thitIlls paril. aph ,hal incltudc.

but lit:cd mit hc hililtcd to.II( (I.iloýý Ilt\ 1 ['Ornlatin, to til. -a eNtc\ lm kllo\\ 1 (I0 N'1 1 t d Im l c fII. c I Ih i uh, , i r m Idi, 6dual , 1 in hw 1i1g, 1hc (0h111i.1.,1i0o

.AV Chermak Quality Manager Scientech, a business unit of Curtiss-Wright Flow Control Corporation 200 S Woodruff Avenue Idaho Falls, Idaho 83401 Dan Meils General Manager Scientech, a business unit of Curtiss-Wright Flow Control Corporation 29399 US Hwy 19 North, Suite 320 Clearwater, FL 33761 (it) idctiillcallon ac h :ila , 1t1 JClmmti 01 .cmr Cl111 1)asic c 1mpc 0c 1. suppiliCd olw such (hcility Or such 3cti )it'\% itl111 11 1C I i >,ir h ý, J > ,i xIch hmiý;S hi cc1i111)In N (w coin lwti1i a dIccfci NUS-7 10DUOTT; A Master Trip Unit manufactured by Scientech.

NUS-7 1 ODUOTS; A Slave Trip Unit manufactured by Scientech.

liii) hint'ilcaic;on i* Ir firm coin iract inu, fhic lalcihii3 c suppiyvinigI h1c basic collin)olcflt w hich tails to comply oi Scientech, a business unit of Curtiss-Wright Flow Control Corporation 200 S Woodruff Avenue Idaho Falls, ID 83401 Instrumentation

& Controls Division CURTISS200 S. Woodruff Ave.Idaho Falls, ID 83401 WRIGHT , (208) 529-1000{iv) N;itult ot'flic dcicclt or Iailure to (oniply aild lhc salctI haard which is crcalcd or could bK cr-catled bY stluchIailurc, 'ouilv/t.In certain operating configurations, NUS-710DU Trip Units could fail to produce a valid trip output signal.E Glass seal around lead S Thru hole for solder fiow Transistor Q8 on the referenced units uses a TO-66 package and is flush mounted on the component side of the PCB. The TO-66 package, based on JDEC drawing TO-213 does not specify the size of the glass-sealed holes in the case (collector) around the base and emitter leads. Random samples measure approximately 0.11" in diameter.The PCB includes standard 0.100" solder pads on both non-component and component sides. During manufacture, Q8 is secured using screws and nuts with leads centered in the through-holes, so no direct solder pad to case contact is possible.

However, the presence of the pad on the component side could facilitate, under certain conditions, excessive solder flow, creating a close proximity, or in the extreme case bridging, between solder on the emitter or base solder pad and the Q8 case. Permanent bridging would be detected during acceptance testing.However, in at least one case, with the trip unit mounted in the trip unit chassis via an extender card, the proximity was close enough to create contact when the board was slightly flexed.The trip units have two modes of operation, NORM and REV, selectable by switch S2, and four operating configurations:

(1) NORM mode, rising trip, energize on trip, (2) REV mode, falling trip, energize on trip, (3)NORM mode, falling trip, de-energize on trip and (4) REV mode, rising trip, de-energize on trip.In configuration (1), the set point is applied to the negative terminal of a comparator and the input is applied to the positive terminal.

When the input rises above the set point, the output of the comparator goes to the positive rail, turning on Q7. When Q7 turns on, it pulls the base of Q8 low, causing Q8 to turn on. When Q8 turns on, the trip output goes to approximately

+24V.In configuration (2), the set point is applied to the positive terminal of the comparator and the input is applied to the negative terminal.

When the input drops below the set point, the output of the comparator goes to the positive rail and turns on Q8, resulting in a trip output of approximately

+24V.In configurations (1) and (2), bridging at Q8 would cause an output trip signal.In configuration (3), when the input drops below the reset point, the output of the comparator goes to the negative rail, which causes Q8 to turn off. When Q8 turns off, the trip output goes to approximately zero volts.In configuration (4), when the input rises above the reset point, the output of the comparator goes to the negative rail and turns off Q8, de-energizing the unit output.

CURTISS -WRIGHT Instrumentation

& Controls Division 200 S. Woodruff Ave.Idaho Falls, ID 83401 (208) 529-1000 In configurations (3) and (4), bridging at Q8 would prevent a valid trip signal from being generated by keeping the output at logic high.Submitted for evaluation 4/29/2014.

The evaluation was completed on 5/7/2014 In ti h ~.c 1 1 a .mý 1/4nOl U 10 11 ~ k% 1 CII cuilidlnm, dol"Cct 01 fkýIjIS h c ni tI)C illItIM-c dilid oa I OCA ci li 01 OW III tl~c ilt. .uIpphc (I0ic., KiI¶ sippiicdI fl. )I- ltiiv hI' stippj)I 1d 0r, 1t1antiliactille~d.

Of 'Plant Part Number Quantity Serial Numbers NUS-710DUOTS 2 1303582, 1303583 Limerick NUS-710DUOTT27000 6 1304197, 1304198, 1304199, 1304200, 1304201, 1304202 Columbia NUS-710DUOTT45059 5 1303632, 1303633, 1303634, 1303635, 1303636 Grand Gulf NUS-7 I ODUOTT27000 3 1303672, 1303673, 1303674 1304219, 1304220, 1304221, 1304222, 1304223, 1304224, 1304225, 1304226, 1304227, 1304228, 1304229, 1304230, 1304231, 1304232, 1304233, Perry NUS-710DUOTT27000 33 1304234, 1304235, 1304236, 1304237, 1304238, 1304239, 1304240, 1304241, 1304242, 1304243, 1304244, 1304245, 1304246, 1304247, 1304248, 1304249, 1304250, 1304251 ( I I Ih 1CcI I I (l : t I)i I x i%\ h Ih I 1; 1x bcct 'I 1.1 I' I IIsiO w h I I I kbe ta n ,ld Wic o t hei in ilid uni I(m orI ;) lflh 111iOll 101-~K i u 16c1 lcflol. ;111(1 ht leIgth l 11111c,~ that ha~s hccni Or W~ill be t.akn io conipilei ilhe act ion.1. Scientech has identified a design change that corrects the problem. The correction is to install spacers under Q8 to provide clearance from the board. The Design Change Notice was complete May 7, 2014.2. Scientech has placed a hold on all affected in-house modules, and will incorporate the design change prior to ship.3. Scientech will notify the plants listed per 21.21(d)(4)(vi) above, and offer to correct the affected units at Scientech's facility by close of business May 8, 2014.

CURTISS -WRIGHT Instrumentation

& Controls Division 200 S. Woodruff Ave.Idaho Falls, ID 83401 (208) 529-1000 1% iii) Any advice reiated to the defect or lhilure to comply about tlie rtcility.

actli Iy. or basic Component dhat has hecin, is hci,, or will bc givei to ptrc hasers or licensees.

None.(ix) III thC case okan1 earls site permit. the entities lo whom an Carly siic permit wa,, transte'rrcd Not applicable.

Should you have any questions regarding this matter, please contact Robert Queenan, Division Manager, Scientech/Instrumentation and Controls, at (208) 524-9311.A Vincent Chermak, SSBB, PMP Quality Assurance Manager I&C Division Scientech, a business unit of Curtiss-Wright Flow Control Company Office (208) 524-9202 1 Fax (208) 524-9238 Cc: Dan Meils Robert Queenan John McGimpsey Michael Weinstein QA File

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