ML20078R452
| ML20078R452 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 10/31/1983 |
| From: | Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 23829, 83-04-#4, 83-4-#4, MCAR-67, NUDOCS 8311150118 | |
| Download: ML20078R452 (13) | |
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l Vice President - Projects, Engineering asJ Constrwction oeneret offices: 1945 West Parnell Road, Jackson, MI 49201 * (517) 78& o453
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October 31, 1983 83-02 #4 Mr J G Keppler, Regional Administrator US Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND ENERGY CENTER PROJECT DOCKET NOS 50-329 AND 50-330 NSSS AND BOP INSTRUMENT CABINETS FILE:
0.4.9.74 SERIAL:
23829
References:
J W Cook letters to J G Keppler, same subject (1) Serial 20697, dated February 11, 1983 (2) Serial 22189, dated May 16, 1983 (3) Serial 23768, dated August 19, 1983 This letter, as were the referenced letters, is an interim 10 CFR_50.55(e) report concerning deficiencies in the installation design of certain Class lE cabinets and panels. As discussed in the attachment, equipment location changes and modifications are being translated into revised design documents.
In those cases where the need for design change has yet to be confirmed, testing has been scheduled with the equipment supplier. All affected equipment has been identified and is being tracked under the Midland Project nonconformance reporting system.
Consumers Power Company will submit another report, either interim or final, by April 27, 1984.
8311150118 831031 PDR ADOCK 05000329 S
PDR JWC/AHB/lr
Attachment:
1)
MCAR 67, Rev 1, Final Report, dated October 19, 1983.
CC Document Control Desk, NRC D Hood, NRC Office of NRR Washington, DC INPO Records Center RJCook, NRC Resident Inspector Midland Nuclear Plant OC1083-0025A-MP01 8
NOV 4 1983
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2 Serial 23829 83-02 #4 OM/0L SERVICE LIST Mr Frank J Kelley Atomic Safety & Licensing Attorney General of the Appeal Board State of Michigan U S 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 Ssite 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 Mr Jerry Harbour Isham, Tincoln & Beale Atomic Safety & Licensing 1120 Connecticut Ave, NW, Suite 325 Board Panel Washington, DC 20036 U S Nuclear Regulatory Commission Washington, DC 20555 Mr James E Brunner, Esq Mr M I Miller, Esq Censumers 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 Gadler, Esq Ms Lynne Bernebei 2120 Carter Avenue Government Accountability Project St Paul, MN 55108 1901 Q Street, NW Washington, DC 20009 September 6, 1983 OC1083-0025A-MP01
Attachment to Serial 23829 83-02 Sh Bechtel Associates Professional Corporation t32012 IkhkkOth MCAR 67 Rev 1, issued January 13, 1983 Electrical control Cabinet / Panel Clearances I
FINAL REPORT DATE:
October 19, 1983 PROJECT:
Consumers Power Company Midland Plant Units 1 and 2 Bechtel Job 7220 j
l Introduction This report addresses the installation design of certain Class IE cabinets / panels in the Midland plant. The installation design for these Class 1E cabinets / panels did not provide sufficient clearances between adjacent cabinets / panels or building walls to account for deflections during a seismic event. The Class 1E cabinets / panels involved are control panels, instrumentation cabinets, relay cabinets, motor control centers, and breaker cabinets. The installation design of Class IE switchgear, power distribution panels, load centers, transformers, battery chargers, batteries, inverters, disconnect switches, and lighting panels was reviewed and found acceptable.
Description of Deficiency Midland FSAR Subsection 3.2.1.1.1 states:
Seismic Category I structures, components, and systems j
are designed to withstand the appropriate seismic loads... and other applicable loads without loss of function.
To conform to these criteria, Class II electrical control cabinets / panels that are not meant to be physically attached to each other and are seismically qualified independently should not interact with each other or adjacent structures during seismic events to maintain the existing seismic qualification. If there were interaction, the existing seismic qualification could be invalidated and the panel's ability to perform its required safety function rendered indeterminate during and after a seismic event. Those cabinets / panels with existing clearance less than that calculated are considered to pose possible safety / qualification pr-blems subject to additional evaluation.
I Eistorical Backaround and Summary of Investination Modifications to the plant's design resulted in addition of Class 1E cabinets / panels in the Midland plant. Review of the installation design l'
of these cabinets / panels indicated that clearances should be maintained between the class 1E cabinets / panels to be consistent with the seismic qualification of the cabinets / panels. An evaluation was performed and an investigatior, of all Class 1E cabinets / panels was undertaken l
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J32012 Bechtel Associates Professional Corporation 132097 Final Report October 19, 1963 Page 2 i
utilizing BC-TOP-4A (Topical Report Seismic Analysis of Structures and i
Equipment for Nuclear Power Plants Rev 3, November 1974), which states:
The minimum clearance between any two structures, components or equipment is maintained at twice the absolute sum of the predicted displacements of the two items under consideration.
The ensuing investigation consisted of several multidiscipline meetings, discussions with other Bechtel offices, jobsite trips to measure clearances around Class II panels / cabinets and to preliminar11y measure panel natural frequencies by in situ testing, review of seismic l
gualification documents, and calculation of required clearances for l
Class 1E cabinets / panels. This investigation identified those cabinets / panels with insufficient clearances in accordance with the guideline of BC-TOP-4A.
There are a total of 254 Class IE cabinets / panels of which 41 were identified as having insufficient clearance with an adjacent cabinet / panel or building wall.
In addition, 26 of the 254 Class 1E cabinets / panels, which had not been installed, did not have clearances to walls / cabinets clearly identified on the design drawings.
Analysis of Safety Implication The Class 1E cabinets / panels in question (including the devices mounted inside) perform required safety functions during and after a seismic event. Because of this, these' cabinets / panels are required to undergo a gus11fication program that demonstrates their ability to function during i
and after a safe shutdown earthquake at the Midland plant. However, the potential effects of the interaction with adjacent cabinets or building walls was not considered during the seismic qualification of the cabinets / panels. Therefore, installation without the minimum clearance may cause impact loads that were not considered in the original seismic qualification of these cabinets / panels. The magnitude of impact loads and their effect on the ability of these cabinets / panels to perform their safety functions is not defined and therefore could invalidate the cabinet / panel original seismic qualification.
Probable cause The root cause for these problems was the failure to identify the potential for interaction between Class IE cabinets / panels and adjacent cabinets / panels or building walls during a seismic event. As a result, the minimum allowable clearances between Class 1E panels and panels or walls were not clearly defined.
l 0155u
Bechtel Associates ProfessionalCorporation 132012132097 NCAR 67 Final Report Octcher 19, 1983 Page 3 Corrective Action j
(
l 1.
The final methods of resolution for the various proximity problems w)*h Class 1E cabinets / panels have been determined. Resolutions are t
provided in Items a through d below.
(Refer to the attached table for the method of resolution selected for each cabinet / panel.)
The equipment location drawing has been revised to specify the s.
required clearance and relocate the cabinets. Field change I
authorizations (FCAs) for the welding design are scheduled for issuance by B&W by November 14, 1983.
b.
Additional testing is scheduled for equipment back to back and equipment-to-wall configurations. The equipment vendor is scheduled to submit the test plan by March 1984. Test results are scheduled for submittal by September 1984. Test results will either qualify the equipment for the existing installation or determine if modifications are required (i.e.,
connect equipment together or to wall). If modifications are required, the design documents are forecasted to be issued within 90 days i
I from submittal of test results. Side-to-side configurations I
will be bolted together to ba consistent with the existing seismic qualification reports. A design change package (DCP) is forecasted for issuance by November 17, 1983, to provide bolting I
instructions.
Minor structural modifications will be made. Consumers Power c.
Company's consultant has reanalyzed the existing configurations and submitted preliminary bracket designs. Detailed design drawings are scheduled for issuance by Consumers Power Company's consultant by November 1, 1983. Associated Bechtel design documents for brace will be issued within 4 weeks from receipt of vendor prints from Consumers Power Company's consultant.
l d.
Cabinets are acceptable as installed. NCR 6292 was dispositioned "use as is" by project engineering on October 7, 1983.
Equipment location drawings were revised to add minimum clearances.
2.
[DCN 11 to Drawing 7220-N-5(Q) and DCN 12 to Drawing 7220-N-7(Q),
i Sh 2 were issued May 5, 1983). Refer to the attached table for the associated cabinets / panels.
To preclude recurrence of these problems, the following has been i
3.
done:
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Bechtel Associates Professional Corporation 132012
" ^"
I32097 Final Report October 19, 1983 Page 4 Project general seismic requirements specifications have been a.
revised to add a statement requiring suppliers to specify a clearance envelope around their class 1E seismic Category I equipment.
[ Specifications 7220-G-6(Q), Rev 9. G-7(Q), Rev 11; C-29(Q), Rev 7; and G-30(Q), Rev 6 have been issued.]
b.
All disciplines have been notified of the proximity guidelines.
4.
Based on the above, it has been determined unnecessary to revise the Midland Final Safety Analysis Report.
Reportability Because the seismic qualification of Class 1E cabinets / panels with less than the required clearances is indeterminate, a conservative assumption was made that ti4e original seisciic qualification may no longer be valid. Thus, this condition, if uncorrected, could have an adverse effect on the safety of operations during or after a seismic event at the Midland plant. This condition was reported to the NRC on January 12, 1983, under the criteria of the Code of Federal Regulations, 10 CFR 50.55(e).
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Bechtel Associates Professional Corporation 132012 NCAR 67 Final Report l32097 October 19, 1983 Page 5 Submitted by:
pg(, 'h ont o Systems Group U
Supervisor Approved by:
E.M. Hughes Project Engineer Concurrence by:
J&""'s E.A. O' W Control Systems Chief Engineer Concurren-4y:
E(II. $t'h Engineering Manage W@
Concurrence by:
for M. A. Dietrich Project Quality Assurance Engineer GS/SES/jsh*
Attachment:
Table - MCAR 67 Panel / Cabinet Proximity Resolutions 0155u
Attcchment to NCAR 67
- 132097, riesi B: Port Page 1 MCAR 67 PANBL/ CABINET PROIINITY RBSOLUTIONS 132012 ProsimitY Problem Equipment With Other Number Panel / Cabinet With Wall Resolution (l)
IC30 1C35 Block wall 1.c 2C30 2C35 Block wall 1.c IC35 1C30, IC452 Block wall 1.c
.2C35 2C30, 2C452 Block wall 1.c 1C43 1C42 NA Note 2 2C43 2C42 NA Note 2 1C46 1C452-Block wall 1.c 2C46 2C452 Block wall 1.c 1C47 NA Block and poured walls 1.c 1C452 1C35, IC46 Block wall
'1.c 2C452 2C35, 2C46 Block wall 1.c 2B24 2856 NA 1.b r
2B56 2B24 MA 1.b 1853 NA Poured wall 1.b 1854 NA Poured wall 1.b 1823 1855 NA' 1.b i
1855 1823 NA 1.b 1824 1856 FA 1.. b 1856 1B24 NA 1.b 2B23 2B55 NA 2.b 2855 2B23 NA 1.b 1863 0859 NA 1.b 1864 0868 NA 1.b 2863 0869 NA 1.b 2B64 0868 NA 1.b 0865 NA Poured wall 1.b 0866 NA Poured wall 1.b 0868
.1864, 2864 NA 1.b 0869 1863, 2863 NA 1.b 2B53 NA Poured wall 1.b 2B54 NA Poured wall 1.b 1C42 1C43 WA 1.a 2C42 2C43 NA 1.a 1891A 1891C MA 1.d 2891A 2891C MA 1.d 1891C 1891A NA 1.d 2891C 2891A NA 1.d IB92B 1892D MA 1.d 2B92B 2B92D MA 1.d 1892D 1892B NA 1.d 2892D 2B928 NA 1.d 0344u e--..,
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dttachment to MCAR 67 I32097 U"'2 132012 Proxistity Problem Equipment With other Number Panol/ Cabinet With Wall ResolutionII) 1C172A Location drawing did not specify clearances 2
1C172B Location drawing did not specify clearances 2
2C172A Location drawing did not specify clearances 2
L 2C172B Location drawing did not specify clearances 2
[
1C171A1 Location drawing did not specify clet. rant.es 2
5 1C171A2 Location drawing did not specify clearances 2
1C17181 Loca%1on drawing did not specify cisarances 2
IC171B2 Location drawing did not specify clearances 2
2C171A1 Location drawing did not specify clearances 2
2C171A2 Location drawing did not specify clearances 2
[
F 2C171B1 Location drawing did not specify clearances 2
h 2C17182 Location drawing did not specify clearances 2
1C171C Location drawing did not specify clearances 2
2C171C Location drawing did not specify clearances 2
IC171D Location drawing did not specify clearances 2
2C171L Location drawing did not specify clearances 2
OC398A Location drawing did not specify clearances 2
OC398B Location drawing did not specify clearances 2
OC398C Location drawing did not specify clearances 2
L OC398D Location drawing did not specify clearances 2
IC184A Location drawing did not specify clearances 2
7 1C184B Location drawing did not specify clearances 2
IC161A Location drawing did not specify clearances 2
2C161A Location drawing did not specify clearances 2
[
IC161B Location drawing did not specify clearances 2
[
2C161B Location drawing did not specify clearances 2
7 OC10 NA NA NA OC20 NA NA NA i
IC11 NA NA NA 1C21 NA NA NA
{
2C11 NA NA NA 2C21 NA NA NA i
IC12 NA NA NA f
1C22 NA NA NA 2C12 NA NA NA
{
2C22 NA NA NA IC13 NA NA NA 1C23 NA NA NA f
2C13 NA NA NA 2C23 NA NA NA f
IC14 NA NA NA L
IC24 NA NA NA I
2C14 NA.
NA NA 2C24 NA NA NA 3
1 ICIS NA NA NA h
IC25 NA NA NA 2C15 NA NA NA
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2C25 NA NA NA I
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Attcchment to NCAR 67 Final R: port 132012 132097 P*s* 2 Prozialty Problem Equipment With Other Number Panel / Cabinet With Wall Resolution (I)
OC29 NA NA NA 1C31 MA NA NA 2C31 NA NA NA 1C44 NA NA NA 2C44 NA NA NA 2C47 NA NA NA 1C114 NA NA NA 2C114 NA NA NA IC150 NA NA NA 2C150 NA NA NA OC151 NA NA NA IC166 NA NA NA 2C166 NA NA NA 1C175A NA NA NA IC175B NA NA NA 2C175A NA NA NA 2C175B NA NA NA OC180 NA NA NA IC447A NA NA NA 1C447B NA NA NA 1C447C NA NA NA 1C447D NA NA NA 1C468 NA NA NA 2C468 NA NA NA 2C447A NA NA NA 2C447B NA NA NA 2C447C MA NA NA 2C447D NA NA NA IC453 NA NA NA 2C453 NA NA NA 1C454 NA NA NA 2C454 NA NA NA OC398 NA NA NA 1C445A NA NA NA IC445B NA NA NA 2C445A NA M
MA 2C445B NA ItA NA 1Y11 NA NA NA 1Y31 NA NA NA 1Y32 NA NA NA 1Y13 XA NA NA OY33 NA NA NA OY34 NA NA NA 1C32 NA NA NA 2C32 NA NA NA 1B43 NA NA NA 1B89 NA NA NA IISS NA NA NA 1151 NA NA NA 1X53 NA NA NA 0344u
132097 i
f.*
Attechnent to MCAR 67 Fical R: port Page 4 132012 Proximity Problem Equipment With Other Number Panel / Cabinet With Wal'1 Resolution (l) 0157 NA NA NA 1I17 NA NA NA 1817 NA NA NA 1D11 NA NA MA 1D12 NA NA NA 1Y10 NA NA NA 1A05 NA NA NA 1Y12 NA NA NA 1Y14 NA NA MA 1844 NA NA NA 1890 NA NA NA 1X56 NA NA MA 1152 NA NA NA II54 MA NA NA 1118 MA NA NA IBIS NA NA NA 1D27 NA NA NA 1D21 NA NA NA 1D22 NA NA NA 1D20 NA NA NA 1Y20 NA NA NA 1A06 NA NA NA 2Y11 NA NA NA 2Y31 NA NA NA 2Y13 NA NA NA 2843 NA NA NA 2B89 NA NA NA 2X55 NA NA NA 2151 NA NA NA 2X53 NA NA NA 2117 NA NA NA 2B17 MA NA MA 2D11 NA NA NA 2D12 NA NA NA 2Y10 NA NA NA 2A05 NA MA NA 2Y12 NA NA NA 2Y32 NA MA NA 2Y14 MA NA NA OY36 NA NA MA OY37 NA NA NA 2B44 MA NA NA 2B90 NA NA MA 2X56 NA NA NA 2152 NA NA NA 2154 NA NA NA 0158 NA NA NA 2X18 NA NA NA 2B18 NA NA NA 2D27 NA NA MA 0344u
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Attech.sent to MCAR 67 Fical R: port Page 5 132012 132097 Proximity Problem Equipsont With other Number Panel / Cabinet With Wall Resolution (II 2D21 NA NA NA 2D22 NA NA NA 2D20 NA NA NA 2Y20 NA NA NA 2A06 NA NA NA 2D25 NA NA NA 2D02 NA NA NA 2Y40 MA NA NA 2D23 NA NA NA 1D25 NA NA NA 1D02 NA NA NA 1Y40 NA NA NA 1D23 NA NA NA 2880 NA NA NA 2L121 NA NA NA IL121 NA NA NA IB80 NA NA NA 2D01 NA NA NA 2D15 NA NA NA 2D17 NA NA NA 2D10 NA NA NA 2Y30 NA NA NA 2D13 NA NA NA 1D15 NA NA NA 1D17 NA NA NA 1D01 NA NA NA 1D10 NA NA NA 1Y30 NA NA NA 1D13 NA NA NA 1BP03 NA NA NA 1BPO4 NA NA NA 2BP03 NA NA NA 2BPO4 NA NA NA 1L120 NA NA NA 1B79 NA NA NA 2L120 NA NA NA 2B79 MA NA NA 0845 NA NA NA 0B46 NA NA NA OY84 NA NA NA OY85 NA NA NA OY86 MA NA NA 0X93 NA NA NA 0X94 NA NA NA 0195 NA NA NA 2C184A NA NA NA 2C184B NA NA NA 1C185A NA NA NA 2C185A NA NA NA l
IC185B NA NA NA 1
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- 7 l32097 Attachment to NCAR 67 Final R: port Page 6 132012 Proximity Problem Equipment With Other Number Panel / Cabinet With Wall Re solut.lonI3 }
2C185B NA NA NA 1C266 NA NA NA 2C265 NA NA NA 1C111 NA NA NA 2C111 NA NA NA j
1C112 NA NA NA i
2C112 NA NA NA 1C231 NA NA NA I
2C231 NA NA NA IC232 NA NA NA 2C232 NA NA NA f
IC41 NA NA NA I
2C41 NA NA NA l
1C45 NA NA NA l
2C45 NA NA NA Notes:
(1) Resolution item numbers refer to corrective action item numbers descrioed in the NCAR final report.
(2)These panels will not be relocated. Resolution of proximity problems is accomplished with relocation of 1/2C42.
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