ML20079R677

Part 21 Evaluation Rept 83-07 Re Improperly Sized Overcurrent Fuses in Dc Motor Feeders.Initially Reported on 830603.Fuses Sized for 225% of Full Load Current Will Be Provided for Jogging Pump

ML20079R677
Person / Time
Site:	Columbia
Issue date:	06/06/1983
From:	Vanderber J BURNS & ROE CO.
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
REF-PT21-83-904-000 BRGO-83-003, PT21-83-904-000, NUDOCS 8306240191
Download: ML20079R677 (16)

Text

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Burns and Roe,Inc.

-185 Crossways Park Drive a Woodbury, New York 11797 a Telephone (516) 677-4000

- TWX 510-2212195 a Cable BURNS ROE WC3Y W.O. 3900/4000 Main office

Subject:

__ Washington Public Power Supply System 550 Kinderkamack Road Oradell, NewJersey 07849 WP-2 #N ^*

Defect and Noncompliance Evaluation Report No. 83-07 Improperly Sized Overcurrent Devices hob June 6, 1983 BR"A-8 3-0 03 U. S. Nuclear Regulatory Commission Region IV 611 Ryan. Plaza Drive Suite 1000

' Arlington, Texas 76011 Attention: Mr. J. P. Collins, Regional Administrator Gentlemen:

Burns and Roe, Inc. reported a condition to D. Fox of' your region on June 3,;1983 which was determined to.be reportable under the guidelines set forth~in 10CFR21. The condition involves improperly sized overcurrent devices and_is documented in_our Defect-and Noncompliance Evaluation Report No. 83-07. A copy of the report is attached.

If you have any_ questions regarding this condition, please contact Burns and Roe,'Inc.

Very truly yours,

-JJV/JMB/es J n J. Verderber Att._ Pro'e t Engineering Manager CC: Mr. R. T. Johnson --WPPSS -1 w/l Director, Office of Inspection and Enforcement - 1 w/3 U. S. Nuclear Regulatory. Commission Washington,-D.C.~ 20555 8306240191 830606 PDR ADOCK 05000397 S PDR [k'

-u o svaluaElon moport Wo. 83-07 l

Paga,1 of 3 '

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DEFECT AND NONCOMPLIANCE EVALUATION REPORT l BURNS AND ROE, INC.

185 Crossways Park Drive Woodbury, New York Project WNP-2 Evaluation Report # 83-07 Work Order 3900 Date 4/11/83 Specific Area of Concern Improperly sized overcurrent devices outside Contractor' Involved (if any) None

1. Description of Potential Defect or Noncompliance Improperly sized overcurrent devices (fuses on WNP-2) in the feeders for DC motors may not be properly sized to allow for starting and/or plugging currents'. These currents may cause the fuses to begin to melt and eventually fail after several cycles.

2. Date and Method of Discovery Burns and Roe, Inc. was advised of four potential problems discovered in the design by Supply System letter, WPBR-F 0333, dated 12/1/82. It was determined that a problem relating to overcurrent device sizing could be applicable to the WNP-2 Project. This potential problem was submitted for evaluation of reportability under 10CFR21 and potential reportability

• under 10CFR50.55e on 2/25/83.

3. Analysis-of Safety Implication Fuses for 125 and 250 VDC, Class lE, pump and valve operator motors were sized between 125 and 150% of motor full load

, current. This meets the requirements of the National Electric l

Code (NEC), Section 430-52 and Table 450-152, which limits fuse sizing to 150.% of motor full load current. Exception l 2b of NEC Section 430-52, permits fuse sizing to be increased l

to 225% of full load current, where 150% is not adequate to permit motor operation. This exception was not used in initial fuse sizing.

l Jogging pumps and throttling valve operator motors fused at 150% or below of full load current could fail due to repetitive inrush current heating of the fuse and eventually causing melting of the fuse. Continuous duty across-line-starting valve operator motors and one continuous duty reduced voltage starting valve operator motor fused at 150% are not adequately fused to permit motor starting. See Attachment for the detail evaluation of this WNP-2 pump and valve operator problem (Problem No. II.d).

Certific

. . Evaluntion R: port No.~83-07 o

~

6 Pagn 2 of 3, Emr,1 The WNP-2 pumps and valves which could be affected by this potential deviation are listed in Table 1. In order to determine if the fuses for these valves and pump motors could melt under their operating conditions, a study would be required to determine the frequency of energization of each valve and pump motor. With this information, the probability of fuse melting could be evaluated and the impact of any loss of ' these valves or pump on their safety system could be determined. However, during abnormal plant operations, the frequency of energization of these items would require extensive analysis and such an analysis still may not be definitive. Therefore, this deviation is con-sidered to be reportable under 10CFR21 and potentially reportable under 10CFR50.55e.

4. Corrective Action Revise the design to incorporate the proper fuse sizes in accordance with the following:

Pumps -

Provide jogging pump motors, if any; with fuses sized for 225% of full load current.

Valve Operators - Provide throttling valve operator motors with fuses' sized for 225% of full load current.

Provide across-line-starting valve operator motors with fuses sized for 175%, minimum, of full load current. Increase fuse size to 200% of full load current for RCIC-V-22.

Advise the Supply System of the methodology to be used by their Test and Start-up Group to evaluate the adequacy of the fuse size for the motors identified above during their test and start-up operations.

5. Required Review and Individual Determination:

Not Engineering Signature /Date Reportable Reportable Study Required

' Cog. Eng'g. Mgr.  !

.Proj. QA Grp. Sup J V Cog. Grp. Supv. -

/f3 -

Lic:ncing Supv. u M7/d /

Initiating Employee /V, N - h g(n.,m,

Evaluction Raport No. 83-07 Pega 3 of 3

6. Evaluation of Vice President of Engineering and Design:

(If required) _.

a. Further Review Required: Engineering Study to be Completed by:

NRC to be informed of a Potential Deviation Not currently considered a Potential Deviation Signature Date NRC Notified by Date Time

b. Defect or Noncompliance is:

^h Not Reportable: Report Check as Appropriate:

FR21 tential 10CFR50.55 (e)

c. Other Facilities which may be affected.

Comments: YO & O f cu l M W h A<tdj$t a. edm.!(t:MbWtE7$444

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R4A+HfAb Signature

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Time

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.8.*34. /2YD N censing Supervisor Signature 'Dafe Tihe

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Evaluation Report No. 83- 07

.,- . Attachmont 1

.Page 1 of 9 ,

~ PROBLEM NO. II.d ,

STATEMENT: .

Improperly Sized Overcurrent Davices (Fuses on WNP-2) - Fuses in the feeders 'for DC motors may not be properly sized to allow for starting cnd/or plugging currents. These currents may cause the fuses to .begin to melt and eventually fail af ter several cycles. ,

FINDING: .

Improperly Sized overcurrent Devices - The DC motor control center fuse ratings are shown on drawing E528, sheets 43 to 4 6. It appears that the fuses are sized to meet National Electric Code (NEC) table 430 - 152 which allows fuses to be rated a maximum of 150% of the full load current of the motor. NEC Section 430-52 exception 2b allows the rating to be increased to 225% to' allow for starting or plugging

. currents. ' oversized fuses have not been specified at WNP-2 and may be necessary.

INVESTIGATION SUGGESTED: *

Improperly Sized overcurrent Devices - Control circuits should be l investigated to determine if plugging or frequent starting of lo' ads is nossible. Fuse, melt characteristics should be checked to verify that inrush currents from starting. or plugging do not damage the fuses.

POSSIBLE. CHANGES:

l Improperly Sized overcurrent Devices - Change the size of the over-l current devices or modify the ' control circuitry as necessary.

MISCELLANEOUS:

Utilize Chase SIawmut 3 fuse melt time curves, not Busman fuse' clearing e time curves.**

~

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, 9 ..

• WPBR-83-0026 Comment 1 .

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! . Rev. 1 4/7/83

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Attachment 1

. Pag @ 2 of 9 PROBLEM NO. II.d

Response

Contract No. 218 Specification-(Section 16A-3.4.11) requires Contractor to install starter fuses " . . . . . .as required by NEC for hor-sepower of motor protected". Contractor was also directed to provide dual-element (time delay) fuses.

In accordance with direction contained in NEC Section 430-52 and Table 430-152, de motor control center fuses may be set at a maximum of 150%. Exception 2b to NEC Section 430-52 permits the maximum fuse size to be increased to 225%. However, it is not the intent of the NEC that fuse sizi*ng be increased above 150% on a generic basis. Fu se sizing should be increased only if the 150% maximum is not sufficient to permit motor starting or operation.

Technical Memorandum No. 1229 recommended that fuses for Class 1E MOV's be selected to allow operation of MOV's for a minimum of two

~. ~m inutes at 200% o ull load current. The recommendations of protec-

, tion requirement formed to satisfy NRC Regulatory Guide 1.106 cri-

,pung .teria. The 200% or two minutes level was determined to be adequate

,4 to permit MOV operation at maximum expected current for the maximum time without motor burnout. The intent is to size overloads and fuses ggpd large enough to assure that operators will attenpt operation for the 3 case of overloads, but not so large as to permit motor burnout.

$/8 Detailed study of some (A.C.) valves determined that for some valves the fuse rather than the overload provides the overcurrent protection for moderate overloads. Fuses should not be oversized unnecessarily.

A review of Burns and Roe Drawing E528, Sheets 43 through 46 indicates the following:

1. Non-Class 1E motor fuses are sized between 125% and 140% .

2. Class 1E motor fuses are sized at approximately 140%.

Valve (all Class 1E) fuses are sized between 125% and 150%.

~

3.

Sizes selected permit operation at 200% for two minutes j minimum.

Mr. A. Richards of Limitorque has indicated the following relative to 125VDC and 250VDC operators : -

a. Small operator locked rotor currents are approximately 6X.

b. Large operator (3-5 H.P.) locked rotor ' currents are approxi-mately 8-9X.

c. Inrush current decays within approximately 1/4 second. The inrush is caused by unseating the valve not by attempting to generate significant valve motion.

4

. Revision 1 4/7/83 4 e

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Evaluation Raport No. 83-07 Attachmnnt 1

,, Paga 3 of 9 d '. Throttling valves and jogging pumps probably require fuse sizing above 150%.

Mr. T. P. Lauless of Bussman has indicated that fuses for throttling valves or jogging pumps may have to be sized with larger than NEC ,

standard 150% setting fuses.- This type of selection will provide

}* locked rotor and short circuit protection only. Bussman has no method for calculating the best fuse size selection since there are too many variables. He indicated that the final fuse selection is normally determined by trial-and-error testing during Startup.

Modification of control circuitry is not considered a viable option.

The DC MCC's are provided with across-the-line starters for 125VDC valves and small 250VDC valves. Reduced voltage starters are provided for 125VDC and 250VDC pumps and 250VDC valves above 4 H.P.

Marked-up copies of Bussman fuse fault clearing time curves are attached. The markings show the present design for a range of valves and motors. Reduced voltage starter inrush is assumed at 6X. Full load currents are based on Burns and Roe Drawing E528. Although it is technically correct that Chase Shawmut fuses have been utilized in MCC's and that fuse melt curves are a more accurate indication of fuse damage, the use of Bussman clearing time curves is considered accep-table. Rationale for acceptance is as follows:

1. Fuses of the same type have similar characteristics, regardless of manuf acturer. The study performed was a general study.

i .

2. Clearing time curves are normally used in general studies and analyses of coordination, etc. There is no significant dif-ference in the results obtained.

Review of the marked-up fuse curves indicates that fuse sizing for '

small across-the-line valve starters and one reduced voltage starter sho ld be increased to accommodate starting currents. 7; Recommendat' ions: , ,,.

A. Pumps: 1. Provide jogging pump motors with 225% protection.

~

2. Continuous duty motors fuse sizing is adequate as originally provided.

b. Valves: 1. Provide throttling valve motors with 225% fuses.

l

2. Reduced voltage starting motor fuse sizing is adequate as originally provided, except fo r RCIC-V-22 which requires a 25A fuse.

Revision 1 4/7/83

apptoni --

Attachm:nt 1 Pago 4 of 9

3. Across-the-line starting motor fuse sizing is marginal for motors 1/2 H.P. and below. Increase fuse sizing to 175% minimum for all across-line-starting valve motors (Note: 175% permits motor starting gives better motor overload protection than 225% and fulfills the intent of T.M. 1229).

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Revision 1 4/7/83

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1A21-9002 .

. Throttling valve MC-S2--1 A W/E 51-C002.  : ,

250 VDC IM21A-10' Non-throttling valve 1M21A-20 MC-S2-1A RHR-V Throttling valve 250 VDC MC-S2-1A - RH R-V-23 .

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250 VDC IM21A-40 Non-throttling valve .

IM21A-70 . .MC-S2-1A RWCU-V-4 '

250 VDC

.RCIC-V-13 Non-throttling valve 250 VDC IM21A-120 MC-S2-1A

• Non-throttling valve - -

IM21A-130. MC-S2-1A RCIC-V-19 -

250 VDC '

RCIC-V-22 Throttling valve 250 VDC IM21A-140 MC-S2-1A

'RCIC-V-59 Non-throttling valve -

250 VDC 1M21A-150 MC-S2-1A 'N'on-throttling valve -

1M21A-160 . MC-S2-1A *3 RCIC-V-64 250 VDC .

RCIC-V-45 Non-throttling valve 250 VDC 1M21A-170 MC-S2-1A .

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1M21A-180 MC-S2-1 A ** RCIC-P-2 Seals in -

250 VOC .

MC-S2 1A'. RCIC-P-4 Operates based on vacuum tank 250 VDC 1M21A-190 "

- pressure ..

Non-throttling valve 1M21A-200 MC-S2-1A RCIC-V-69 250 VDC TG-EOP-1 Runs for entire coastdown period.

250 VDC - AM218-10 . MCLS2-1B . ~

TG-ASOBP-1 Runs continuously 250 VDC AM21B-20 MC-S2-1B RFT-EOP-1A Runs on low oil pressure demarid 250 VDC AM218-30' MC-S2-1B

• Runs on low oil pressure demand AM21B-40 MC-S2-1B R ET-EOP-1 B 250 VDC .

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SUMMARY

hF LOADS AND' FEEDERS #f"a 2 o." 3 .-

DC SYSTEM FEEDER PROM TO . COMMENTS -

125 VDC 1D11-1 Batt B1-1 DP-S1-1 - -

(Div. I) ,

DP-SI-1 MC-SI-1D 125 VDC 1D11-3 ' '

(Div. I) .

125 VDC IM11D-10' MC-SI-ID RCIC-V-31 'Non-throttling valve ,

fniv. I) .

125 VDC MC-SI-1D 1M11D-20 DO-Pc3A-1 Run for only 13 sec to start D-G (Div. I) 125 VDC IM11D-30 .MC-SI-ID RCIC-V-10 ,

Non-throttling valve <

(Div. I) . . . ,

125 VDC' 1M11D-40 '

. MC-SI-1D DO-P-3A-2 , Run for only 13 sec to start D-G (Div. I) 125 VDC IM11D-50' MC-SI-ID ,RCIC-V-8*

• Throttling valve (Div. I) 125 VDC 1M11D-60 MC-SI-1D -

DLO-P-2A-1 Run for only 13 see to start D-G (Div. I) - -

125 VDC -

IM11D-70 MC-SI-ID' DLO-P-2A-2 Run for only 13 sec to start D-G -

(Div. I) '

.125 VDC IM11D-80 MC-SI-1D CAC-V-2 'Non-throttling valve -

, (Div. I) l 125 VDC 1M11D-90 MC-SI-ID CAC-V-6 ,

. Non-throttling valve (Div. I) .

! 125 VDC IM11D-100 MC-SI-1D CAC-V-4 Non-throttl'ing valve .

(Div. I) 125 VDC 1H11D-110 MC-SI-ID CAC-V-8 Non-throttling vavle (Div. I) . .

125 VDC . IM11D-120 MC-SI-ID RCIC-V-110 Non-throttling valve

. (Div. I) 125 VDC .1M11D-130 MC-SI-1D RH R-V-4 0 Throttling valve '

(Div. I) 125 VDC IM11D-140 MC-SI-1D MS-V-19 Non-throttling valve .

(Div. I) '

125 VOC IM11D-170 MC-SI-ID RCIC-V-46 Non-throttling valve (Div. I) 125 VDC AM11D-9160* MC-SI-1D RCC-V-6 Non-throttling valve -

(Div. I) ,

l *Non-Class IE motor purchased 80% starting voltage capability. ,

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SUMMARY

OF LOADS _AND _FE'EDERS - .

'y DC SYSTEM FEEDER FROM TO '

COrtMENT'S

'125 VDC 2012-1 Batt 'B1-2 ~

DP-SI-2 -

(Div. II) -

• 125 VDC 2D12-9 DP-SI-2 -

MC-SI-2D -

(Div. II)

• 125 VDC 2M12D-10 MC'-SI-2D DO-P-3 81 LDiv. II) .

, Rhn ,for only.13 sec to start D ;G 125 VDC

. 2H12D-20 MC-SI-2D DO-P-382 Run for only 13 see to start D-G

~

(Div. II)  ? - '

125 VDC 2M12D-30 e MC-SI-2D DLO-P-2B1 *

(Div. II). Run for only 13 see to start D-G 125 VDC ~ 2M12D-40 MC-S1-2D (Div. II)

DLO-P-2 B2 , Rdn for only.13' sec to start D-G

] , 125 VDC 2M12D-50 MC-SI-2D CAC-V-11 (niv. II) .

Non-throttling valve 4

125 VDC 2M12D-60 MC-SI-2D CAC-V- 15 j (Div. II) Non-throttling valve "

125 VDC 2M12D-70 MC-SI.2D CAC-V- 13 (Div. II)

Non-throt tling . valve 125 VDC 2H12D-80 MC-St-2D CAC-V-17 (Div. II) r Non-throttling valve ,

125 VDC 2M12D-90 MC-SI-2D.

RCIC-V-113, Non-throttling valve (Div. II) .

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