ML20080P310
| ML20080P310 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 02/03/1984 |
| From: | Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 28001, 84-01-#1, 84-1-#1, NUDOCS 8402220504 | |
| Download: ML20080P310 (8) | |
Text
P COIISumBIS is F POW 8r (3 pppy James W Cook Uw5MyU5e1 Vice President - Projects, Engineering and Construction Geneial offices: 1945 Wet + Parnait Road, Jeckson, MI 49201 e (517) 788-0453 February 3, 1984 84-01 #1 i
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Mr J G Keppler, Regional Administrator PRINC'iPAL STAFF US Nuclear Regulatory Commission SN
\\ OPRP Region III b/RA 7
799 Roocievelt Road fi/Re
/TPMSF Glen Ellyn, IL 60137 40
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$63 MIDLAND ENERGY CENTER PROJECT SGA/
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DOCKET NOS 50-329 AND 50-330 5[L _ ___ [ ' $
EXCESSIVE VOLTAGE DROP -
AUXILIARY FEEDWATER VALVE ACTUATORS FILE:
0.4.9.88 SERIAL:
28001 On January 6, 1984 Consumers Power Company notified your staff of a potential 10CFR50.55(e) condition involving excessive voltage drop in power cables supiilying auxiliary feedwater system DC valve actuators.
This letter is an interim 10CFR50.55(e) report. The attachments to this letter describe the concern and summarize the investigation and corrective action taking place.
Another report, either interim or final, will be sent on or before April 13, 1984 JWC/cd Attachments:
(1) MCAR-1, Report 80, Revision 1, dated January 23, 1984 (2) MCAR-80, Interim Report 1, Revision 1, dated January 31, 1984 CC: Docunent Control Desk, NRC Washington, DC RJCook, NRC Resident Inspector Midland Nuclear Plant DSHood, USNRC Office of NRR INPO Records Center 8402220504 040203 PDR ADOCK 05000329 S
PDR OC0184-Ooooa-rrut FEB 151984 1
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2 Serial 28001 84-01 #1 OM/0L SERVICE LIST Mr Frank J Kelley Atomic Safety & Licensing Attorney General of the Appeal Board State of Michigan U 3 Nuclear Regulatory Commission Ms Carole Steinberg, Esq Washington, DC 20555 Assistant Attorney General Environmental Protection Division Mr C R Stephens (3) 720 Law Building Chief, Docketing & Services Lansing, MI 48913 U S Nuclear Regulatory Commission Office of the Secretary Washington, DC 20555 Mr Myron M Cherry, Esq Suite 3700 Ms Mary Sinclair Three First National Plaza 5711 Summerset Street Chicago, IL 60602 Midland, MI 48640 Mr Wendell H Marshall Mr William D Paton, Esq RFD 10 Counsel for the NRC Staff Midland, MI 48640 U S Nuclear Regulatory Commission Washington, DC 20555 Mr Charles Bechhoefer, Esq Atomic Safety & Licensing Atomic Safety & Licensing Board Panel Board Panel U S Nuclear Regulatory Commission U S Nuclear Regulatory Commission Washington, DC 20555 Washington, DC 20555 Dr Frederick P Cowan Ms Barbara Stamiris 6152 N Verde Trail 5795 North River Road Apt B-125 Rt 3 Boca Raton, FL 33433 Freeland, MI 48623 Mr Fred C Williams Dr Jerry Harbour Isham, Lincoln & Beale Atomic Safety & Licensing 1120 Connecticut Ave, NW, Suite 325 Board Panel Washington, DC 20036 U S Nuclear Regulatory Commission Washinhton, DC 20555 Mr James E Brunner, Esq Mr M I Miller, Esq Consumers Power Company Isham, Lincoln & Beale 212 West Michigan Avenue Three First National Plaza Jackson, MI 49201 52nd Floor Chicago, IL 60602 Mr D F Judd Mr John Demeester, Esq Babcock & Wilcox Dow Chemical Building PO Box 1260 Michigan Division Lynchburg, VA 24505 Midland, MI 48640 Mr Steve Cadler, Esq Ms Lynne Bernabei 2120 Carter Avenue Government Accountability Project St Paul, MN 55108 1901 Q Street, NW Washington, DC 20009 September 6, 1983 OC0184-0066A-MP01
l40586 Serial 28001 00-01 #1 OUAUTY ASSURANCE PROGRAM i
MANAGEMENT CORRECTIVE ACTION REPORT MCAR-1 REPORT NO. 80 Rev.1 gg JOB NO. 7220 Q NO.
DATE 1/23/84 l* DESCRIPTION (including references):
The voltage drop in the power cables for the auxiliary feedwater system de reverting motors for valves (see page 2) is actually greater than the value considered when sizing the cables for this application. The voltage drop has now been calculated [ Calculation QPE-18(Q) approved December 21, 1983], and results indicate that voltage at the associated motor operated valves is below the allowable limits for proper operation.
(continued on page 2)
- RECOMMENDED ACTION (Optional) 1)
Determine root cause of the design deficiency and provide corrective action to prevent recurrence.
2)
Determine the extent of review necessary to identify similar voltage drop deficiencies for all Class lE circuits, g
(continued on page 2)
REFERRED TO DE ENGINEERING O CONSTRUCTION O QA MANAGEMENT O
L/N O PROCUREMENT ISSUED BY
- This deficiency was reported to the NRO by the client Prcp:t OA Engineer [
Date as potentially reportable under 10CFR 50.55(e) on 1/6/81 ll REPORTABLE DEFICIENCY NOT IE 8I O NO
- Si! YES
/
ProjectManager [
/ date l
Ill CAUSE l
CORRECTIVE ACTION TAKEN AUTHORIZED BY Date STANDARD DtSTRIBUTON ADDITONAL DISTROUTON AS APPROPRIATE DIVISON CA MANAGER ENGINEERING MANAGER FORMAL REPORTTO CUENT Date MANAGER OF OA BPC PROJECT ENGINEER (If Section11 Applies)
GPD - QA MANAGER QE SUPERVISOR CONSTRUCTON MANAGER PD OA MANAG R FROJ SUPT /PROJ CONSTR MANAGER PROJECT MANAGER CHIEF CONSTR OC ENGINEER CUENT CORRECTIVE ACTION IMPLEMENTED DMSON PROCURENT MGR PROJ OROCUREMENT MGR PROCUREMENT SUPPUER QUAUTY MGR AND DN SUPPUER QUALITY MGR VERIFIED BY Project GA Engineer Date
'Desenbe in space provided and atteen reference document.
AAPD-0161
MCAR 80, Rev.1 Page 2 140586 DESCRIPTION continued:
The Class lE redundant safety de valve actuator motors may fail to operate under anticipated plant conditions because of insufficient voltage. The net result could be loss of feedwater to the steam generators and the inability to safely cool down the reactor coolant system.
If this deficiency were to remain uncorrected, it could have adversely affected the safety of operations at the Midland plant.
Cable Number Local Control Cable Number Dist Panel To Station Number Loc.
.etion To Valve Number Local Station (Starter)
Actuator Motor IM03177A IBD2114 A INM03177A IBFWO81 R,S,T,U IM03177B IBD2115 A INM03177B IBFWO82 R,S,T,U 2M03277A 2BD2114 A 2NM03277A 2BFWO81 R,S,T,U 2M03277B 2BD2115 A 2NM03277B 2BFWO82 R,S,T,U IM03865A 1ADlll4 A INM03865A 1AFWO82 AG,H IM03865B IBD2116 A INM03865B IBFWO83 AG,H 2M03965A 2ADlll4 A 2NM03965A 2AFWO82 AG,H 2M03965B 2BD2116 A 2NM03965B 2BFWO83 AG,H IM03831(ING05) IBD2117 A IC266 IBFWO88 AC,AF 2M03931(2NG05) 2BD2117 A 2C266 2BFWO88 AC,AF NOTE: IM03177A through 2M03965B (Dwg. E-158(Q)) are steam generator auxiliary feedwater isolation valves. IM03831 and 2M03931 (Dwg. E-153(Q)) are auxiliary feedwater turbine 1/2G05 stop valves.
RECOMMENDED ACTION continued:
3)
Perform a detailed review as determined from (2) above and document results.
4)
Provide remedial corrective action for the discrepant cables listed herein and for any other deficiencies noted from investigative review; initiate NCRs and safety evaluations as required.
5)
Issue first report, interim or final, by 1/20/84.
Serial 28001 141453 BechtelNb$ciates Professional Corporation
SUBJECT:
MCAR 80 Rev 1 (issued January 24, 1984)
Auxiliary Feedwater DC Reversing Valve Actuator Excessive Power Cable Voltage Drop INTgRIM REPOCT 1 DATg:
January 31, 1984 PROJECT:
Consumers Power Company Midland Plant Units 1 and 2
- echtel Job 7220 Introduction This report provides the interim status and course of corrective action required pursuant to MCAR 80.
l Description of Deficiency The voltage drop in the power cables for the auxiliary feedwater system de reversing valve actuator motors is greater than the value l
considered when the cables were sized. The voltage drop has now been calculated [ Calculation QPE-18(Q), approved December 21, 1983), and the results indicate that voltage at the associated motor-operated valves is below the allowable limits for proper operation.
(
Probable Cause I
1 Voltage drop resulting from the total circuit length between the starter and actuator motor was not considered in the design.
i Summary of Investimation and Historical Background The investigation into the adequacy of de reversing valve actuator j
circuits was initiated as a result of TPO Problem Alert 82-02, j
Revision 0 (DC Power Circuit Starters and Sizes of Cables for Motors and Valse Actuator Motors). The problem alert identified a voltage deficiency in these types of circuits at the Susquehanna Steam Electric Station, Units 1 and 2.
During the investigation, 10 de reversing valve actuators in the auxiliary feedwater system have been identified that will have voltage below the allowable limits for j
proper operation (see the attachment). Nonconformance Report (NCR)
D-00007 has been written on the Midland project as a result of this i
investigation to ident.*.fy and track the corrective action.
Ana1Ysis of Safety Impilcations The power cable voltage drop concerns associated with this NCAR have been analyzed for impact on the safety of operations at the Midland i
plant. If this deficiency were to remain uncorrected, it could have adversely affected the safety of operations at the Midland plant.
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I4l468 I41453 Bechtel Associates Professional Corporation NCAR 80 Interim Report 1 page 2 Corrective Action The following corrective actions have been or will be initiated.
1.
A design calculation has been issued to provide the criteria for sizing power cables for de reversing motor-operated valves (NOVs). All future designs including rework will use these criteria for cable sizing. All design personnel in the electrical group have been instructed regarding this requirement.
2.
A detailed review of Class 1E power and control circuits at the various plant voltage levels will be performed to confirm circuit adequacy with regard to voltage drop. The voltage levels to be reviewed are as follows:
a.
Medium Voltage 1) 4.16 kV feeds 2) 4.16 kV motors b.
Low-Voltage Power 1) 480 V load center feeds
- 2) 460 V motor control center feeds
- 3) Distribution panels feeds (120 V ac and 125 V de) 4)
120 V ac electrohydraulic valve actuators c.
Low-Voltage Control l
1) 120 V ac from motor control transformers
- 2) 125 V de control As a result of this review, additional NCRs will be initiated to identify and track any nonconformances found, and appropriate process corrective action will be implemented to preclude recurrence. The scope and schedule for the review will be provided in the next report.
All Class 1E de valve actuators have been reviewed (reference Calculation QPE-18(Q)]. There are no additional de valve actuators other than the 10 identified in the MCAR.
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I4I468 14.l'453 Bechtel Associates Professional Corporation MCAR 80 Interim Report 1 Page 3 3.
To correct the insufficient voltage condition for the de valve actuators, the power cables will be replaced with larger cables, and/or the starter will be relocated closer to the motors. This will raduce the voltage drop within acceptable limits as defined in Calculation QPE-18(Q). The forecast date for issuance of the design is March 16, 1984.
Reportability This deficiency was reported to the NRC by Consumers Power Company as potentially reportable on January 6, 1984.
l Submitted by:
h-
\\
Jj, E.B. Poser Project Engineering l
Manager I
Approved by-R.L. 5 sticberry' hlectrical Chief Engineer D.H.
Smith \\
/
[
Engineering Manager Concurrence by:
[
,for M.I. Dietrig Project Quality Assurance Engineer
Attachment:
List of DC Valve Actuators with Excessive Voltage Drop l
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Attachment to MCAR 80 Int rin R; port 1 LIST OF DC VALVE ACTUATORS WITH EXCESSIVE VOLTAGE DROP t ;e
~
Cable Number Local Control Cable Number Dist. Panel to Station Number Local Station To
'41468 vaive Number toca1 Station
< Starter)
Actuator Motor IM03177A 1BD2114A INM03177A IBFWO81 R, S, T, U IM03177B 1BD2115A INM03177B IBFWO82 R, S. T. U 2M03277A 2BD2114A 2NM03277A 2BFWO81 R S, T U 2M03277B 2BD2115A 2NM03277B 2BFWO82 R, S. T, U i
l IM03865A 1AD1114A INM03865A 1AFWO82 AG, H IM03865B IBD2116A INM03865B IBFWOS3 AG, H 2M03965A 2AD1114A 2NM03965A 2AFWO82 AG, H 2M03965B 2BD2116A 2NM03965B 2BFWO83 AG, H 1M03831 (1NG05)
IBD2117A 1C266 IBFWO88 AC, AF 2M03931 (2NG05) 2BD2117A 2C266 2BFWO88 AC, AF NOTES:
1.
1M03177A-2M03965B [E-158(Q)] are steam generator auxiliary feeduater isolation valves.
t 2.
IM03831-2M03931 [E-153(Q)] are auxiliary feedwater turbine 1/2G05 stop valves.
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