ML20080C844

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Interim Deficiency Rept Re Bechtel Installation/Design of Certain Class IE Cabinets/Panels.Initially Reported on 830211.General Seismic Requirement Specs Revised.Next Rept Expected by 831102
ML20080C844
Person / Time
Site: Midland
Issue date: 08/19/1983
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, 83-02-#3, 83-2-#3, NUDOCS 8308290344
Download: ML20080C844 (13)
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hGlf, and Construction General Officos: 1945 West Parnali Road, Jackson, MI 49201 e (517) 788 0453 August 19, 1983 83-02 #3 fC-3Y 3,. 560 Mr J G Keppler, Regional Administrator US Nuclear Regulatory Commission Region III 799 Roo'evelt Road Glen Ellyn, IL 60137 MIDLAND NUCLEAR COCENERATION PLANT -

DOCKET NOS 50-329 AND 50-330 NSSS AND BOP INSTRUMENT CABINETS FILE:

0.4.9.74 SERIAL:

23768

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 This letter, as were the referenced letter, is an interim 50.55(e) report concerning deficiencies in the installation design of certain Class 1E cabinets / panels. The attachment to this letter provides a description of the deficiencies and the corrective actions being taken to resolve this problem.

Another report, either interim or final, will be sent on or before November 2, 1983 a

JWC/WRB/cd

Attachment:

1)

MCAR 67, Rev 1, Interim Report 3, dated July 18, 1983.

CC Document Control Desk, NRC Washington, DC RJCook, NRC Resident Inspector Midland Nuclear Plant c&7, OC0883-0009A-MP01 8308290344 030819 PDR ADOCK 05000329

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Serial 23768 83-02 #3 CC: C3echhoefer, ASLB Panel LBernabei, CAP FPCowan, ASLB Panel JHarbour, ASLB Panel AS&L Appeal Panel MMCherry, Esq MSinclair BStamiris CRStephens, USNRC WDPaton, Esq, USNRC FJKelley, Esq, Attorney General-SHFreeman, Esq. Asst Attorney General WHMarshall GJMerritt, Esq. TNK&J INPO Records Center a

OC0883-0009A-MP01

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12.2289 Bechtel Associates Professional Corporation i22381 EUBJECT:

NCAR 67, Rev 1, issued January 13, 1983 Electrical Control Cabinet / Panel Clearances INTERIM REPORT 3 DATE:

July 18,1983 PROJECT:

Consumers Power Company Midland Plant Units 1 and 2 Bechtel Job 7220 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, and motor control centers. The installation design of Class 1E switchgear, power distribution panels, load centers, transformers, battery chargers, 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 are designed to withstand the appropriate seismic loads... and other applicable loads without loss of function.

l To conform to these criteria, Class 1E 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 problems subject to additional evaluation.

Historical Background and Summary of Investination Modifications to the plant's design resulted in addition of Class 1E cabinats/ panels in the Midland plant. Review of the installation design i

l of these cabineta/ panels indicated that clearances should be maintained i

between the Class 1E cabinets /canels to be consistent with the seismic qualification of the cabinets / panels. An evaluation was performed and an investigation of all Class 1E cabinets / panels was undertaken 651%bn

1222BS Bechtel Associates Professiona! Corporation i2238i MCAR 67 Interim Report 3 July MI, 1983 Page 2 utilizing BC-TOP-4A (Topical Report, Seismic Analysis of Structures and 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 1E panels / cabinets and to preliminarily measure panel natural frequencies by in situ testing, review of seismic qualification documents, and calculation of required clearances for Class 1E cabinets / panels. This investigation identified those cabinets / panels with insufficient clearances in accordance with the l/h(

guidelins of BC-TOP-4A.

There are a total of 254 Class 1E cabinets / panels of which 41 have been identified as having insufficient clearance with an adjacent cabinet / panel or building wall. An additional 26 of these Class 1E cabinets / panels, which have not yet been installed, did not clearly identify tiearances to walls / cabinets.

l 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 qualification program that demonstrates their ability to function during 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 impoet 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 probable cause for these problems was the failure to identify the potential for interaction between Class 1E cabinets / panels and adjacent l

cabinets / panels or building walls during a seismic event. In summary, the methods for determining the minimum allowable clearances between Class 1E panels and panels or walls were not clearly defined.

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i 122289 Bechtel Associates Professional Corporation i 2 2 3 8 i = Interim Report 3

'7 July 18, 1983 Page 3 Corrective Action 1.

The methods of resolution for the various proximity problems with Class 1E cabinets / panels are provided in Items a through d below.

(Refer to the attached table for the method of resolution selected for each cabinet / panel.)

a.

Relocate the cabinets.

I b.

Cechtel is awaiting the results of the study from the equipment vendor. Additional evaluation with possible testing may be necessary, c.

Minor structural modifications are planned. The existing configuration will be reanalyzed and structural modifications will be made using the cabinets' existing bolt holes wherever possible. The cabinets and internal devices will be regualified for this configuration. Consumers Power Company's consultant is responsible for the requalification and will issue detailed design drawings for the modification to Consumers Power Company.

d.

B&W is evaluating axisting test data and will perform an h

analysis that should resolve the proximity problem.

2.

Equipment location drawings were revised to add minimum clearances.

(DCN 11 to Drawing 7220-M-5(Q) and DCN 12 to Drawing 7220-E-7(Q),

Sh 2 were issued May 5, 1983].

3.

To preclude recurrence of these problems, the following has been or will be done:

a.

Project general seismic-requirements specifications have been j

revised to add a statement requiring suppliers to specify a 1

clearance envelope around their Class 1R seismic Category I equipment.

(Specifications 7220-C-6(Q), Rev 9 G-7(Q), Rev 11; G-29(Q), Rev 7; and G-30(Q), Rev 6 have been issued.]

b.

All disciplines will be notified of the proximity guidelines.

]

c.

Because of the actions noted in Items 3a and 3b above, it has been determined unnecessary to revise the Midland Final Safety Analysis Report.

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122289 Bechtel Associates Professional Corporation 122381 i

MCAR 67 Interim Report 3 July 18, 1983 l

Page 4 Reportability Because the seismic qualification of Class 1E cabinets / panels with less than the required clearances is indeterminate, we take the conservative position that the original seismic qualificatic. may no longer be valid. Thus, this condition, if uncorrected, e ild have a potentially adverse effect on the safety of operations in i.no event of an earthquake 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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122289 Bechtel Associates Professional Corporation 12238I MCAR 67 Interim Report 3 July 18,1983 Page 5 Submitted by:

G. singh Control Systems Group Supervisor MCA Approvedby:[.

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.M. Hughes f

Project Engineer Concurrence by:

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E.A. 9* Hare Control Systems Chief Engineer

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Concurrence by:

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ith Engi ering Man r

Concurrence by:

k f3,- M.A. Dietric Project Qual ty Assurance Engineer

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Attschment: Table - MCAR 67 Panel / Cabinet Proximity Status l

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Attcchmext t3 NCAR 67 Intcrin R port 3 i

122289 MCAR 67 PANEL / CABINET PROIIKITT STATUS 122381 lA Proximity Problem Equipment With other Number Panel / Cabinet With Wall Resolution (l)

IC30 1C35 Block wall 1.c 2C30 2C35 Block wall 1.c 1C35 1C30, IC452 Block wall 1.c 2C35 2C30, 2C452 Block wall 1.c 1C43 1C42 MA 1.a(2)

A 2C43 2C42 MA 1.a(2) lbl 1C46 1C452 Block wall 1.c 2C46 2C452 Block wall 1.c 1C47 MA Block and poured walls 1.c 1C452 1C35, IC46 Block wall 1.c 2C452 2C35, 2C46 Block wall 1.c 2824 2856 MA 1.b 2B56 2B24 MA 1.b 1B53 MA Poured wall 1.b 1B54 MA Poured wall 1.b 1B23 1855 MA 1.b 1B55 1823 MA 1.b 1B24 1B56 MA 1.b 1B56 IB24 MA 1.b 2B23 2855 MA 1.b 2B55 2B23 MA 1.b IB63 OB69 MA 1.b 1B64 0868 MA 1.b 2863 0869 MA 1.b 2B64 0868 MA 1.b OB65 MA Poured wall 1.b 0866 MA Poured wall 1.b OB68 1B64, 2B64 MA 1.b 0869 1863, 2B63 MA 1.b 2B53 MA Poured wall 1.b 2B54 MA Poured wall 1.b 1C42 1C43 MA 1.a 2C42 2C43 MA 1.a 1891A 1B91C MA 1.d 2891A 2B91C MA 1.d IB91C IB91A NA 1.d 2B91C 2B91A NA 1.d IB92B 1B92D MA 1.d 2B928 2B92D MA 1.d IB92D 1B92B MA 1.d 2B92D 2892B MA 1.d i

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Att chment to MCAR 67 1

~Interia Caport 3 122289 rag 2 2

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Prosialty Problem

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Equipment With other bbI Mumber Panel / Cabinet With Wall Resolution (l) 8 3-IC172A Location drawing did not specify clearances 2

1C1728 Location drawing did not specify clearances 2

2C172A Location drawing did not specify clearances 2

2C172B Location drawing did not specify clearances 2

1C171A1 Location drawing did not specify clearances 2

1C171A2 Location drawing did not specify clearances 2

1C17151 Location drawing did not specify clearances 2

1C17182 Location drawing did not specify clearances 2

2C171A1 Location drawing did not specify clearances 2

2C171A2 Location drawing did not specify clearances 2

Lo'ation drawing did not specify clearances 2

2C171B1 c

h 2C17182 Location drawing did not specify clearances 2

IC171C Location drawing did not specify clearances 2

2C171C Location drawing did not specify clearances 2

1C171D Location drawing did not specify clearances 2

2C171D Location drawing did not specify clearances 2

0C398A Location drawing did not specify clearances 2

OC3988 Location drawing did not specify clearances 2

OC398C Location drawlog did not specify clearances 2

OC398D Location drawing did not specify clearances 2

1C184A Location drawl:;; did not specify clearances 2

1C184B Location drawing did not specify clearances 2

1C161A 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

OC10 MA NA MA OC20 MA NA NA 1C11 MA MA NA IC21 MA NA NA 2C11 MA MA NA 2C21 MA MA NA IC12 MA NA NA 1C22 MA NA NA 2C12 MA NA MA 2C22 MA NA MA 1C13 MA NA NA 1C23 MA NA NA 2C13 MA MA MA 2C23 MA NA NA 1C14 MA NA NA 1C24 MA NA NA 2C14 MA NA NA 2C24 MA NA NA 1C15 MA NA NA 1C25 MA NA MA i

2C15 NA NA MA 2C25 MA MA MA 0344u 1,.,,

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Attcchaeat to HCAR 67 Interic Ccport 3

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Proximity Problem i 2238i Mqu paent W th ther Number Panel / Cabinet With Wall Resolution (I)

OC29 MA NA MA 1C31 MA NA NA 2C31 MA NA MA 1C44 MA MA NA 2C44 MA NA MA 2C47 MA NA MA 1C114 MA MA MA 2C114 MA MA MA 1C150 MA NA MA 2C150 MA MA MA OC151 MA MA MA IC166 MA MA MA 2C166 MA NA MA 1C175A MA NA NA 1C175B MA NA NA 2C175A MA NA NA 2C175B MA MA MA OC180 MA NA MA IC447A MA MA MA 1C447B MA NA MA 1C447C MA MA MA 1C447D MA NA MA 1C468 NA NA NA 2C468 MA NA MA 2C447A MA NA NA 2C447B MA NA NA 2C447C MA MA NA 2C447D MA NA NA IC453 MA NA MA 2C453 NA NA NA 1C454 MA MA MA 2C454 MA NA MA OC398 MA NA MA IC445A NA NA NA 1C445B MA MA MA 2C445A NA MA NA 2C445B MA NA NA 1Y11 MA MA NA 1Y31 MA NA NA 1Y32 MA NA MA 1Y13 MA MA NA OY33 MA NA NA OY34 MA NA NA IC32 MA NA MA 2C32 MA NA NA IB43 MA NA MA 1B89 MA NA NA 1I55 idA MA NA II51 MA NA NA 1X53 MA NA NA 0344u w-ne ara w-w u,qw ='Mrpp-W~acuy ~- :5;'5 ~9.- 3-5 -- }

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AttcchPnelt t2 MCAR 67 Interia R: port 3 122289 P=2 4 Proximity Problem

}2238l Equipment With other gr Number Panel / Cabinet With Wall Resolution (l) 0I57 MA NA NA II17 MA NA MA 1817 MA MA NA 1D11 MA MA NA ID12 MA NA MA in0 MA NA NA 1A05 MA MA MA In2 MA MA MA In4 MA MA MA 1B44 MA MA NA

-a 1890 MA NA MA 1I56 MA NA NA 1I52 MA MA NA 1I54 MA NA MA III8 MA NA NA 1B18 MA MA MA 1D27 MA MA NA 1D21 MA NA MA 1D22 MA NA MA ID20 MA NA MA 1Y20 MA NA NA 1A06 MA NA NA 2n1 MA NA NA 2Y31 MA MA NA 2n3 MA MA NA 2B43 MA NA NA 2B89 MA NA NA 2X55-MA NA NA 2151 MA MA MA 2I53 NA NA NA 2X17 MA MA MA 2B17 MA NA NA 2D11 NA NA NA 2D12 MA NA NA 2n0 MA NA MA 2A05 MA NA MA 2n2 MA NA MA 2Y32 MA NA MA 2n4 MA NA NA

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OY36 MA NA NA l

OY37 MA MA NA l

2B44 MA NA NA 2B90 MA NA NA 2X56 MA NA NA 2152 MA NA NA 2X54 MA NA MA 0I58 MA NA MA 2I18 MA NA NA 2B18 MA MA NA 2D27 MA NA NA i

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Proximity Problem 12 2 3 8 PSuis=ent With Other Number Panel / Cabinet

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With Wall Resolution (l) 2D21 MA MA MA 2D22 MA MA MA 2D20 MA MA MA 2Y20 MA MA MA 2A06 MA MA NA 2D25 MA NA MA 2D02 MA MA MA 2Y40 MA MA MA 2D23 MA MA MA 1D25 MA MA MA 1D02 MA MA NA 1Y40 MA NA MA 1D23 MA MA MA 2B80 MA NA MA 2L121 MA MA NA IL121 MA MA MA 1880 MA MA MA 2D01 MA MA MA 2D15 MA MA MA 2D17 MA NA MA 2D10 MA NA MA 2Y30 MA NA NA 2D13 NA NA MA 1D15 MA NA MA 1D17 MA MA NA 1D01 NA NA MA 1D10 MA MA MA 1Y30 MA NA NA 1D13 MA NA NA 1BP03 MA MA MA 1BPO4 MA MA NA 2BD03 MA NA NA 2BPO4 NA NA MA IL120 MA MA MA 1B79 MA ha MA 2L120 MA MA MA 2B79 MA MA MA 0845 MA MA MA OB46 MA MA NA OY84 NA NA NA OY85 MA NA MA OY86 MA NA MA 0X93 MA MA NA 0194 NA MA MA 0195 MA NA NA 2C184A MA NA MA 2C184B MA NA MA IC185A NA NA NA 2C185A MA NA NA IC185B MA MA MA 0344u

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Atttchaelt ts NCAR 67 IItcria Report 3 2

9 gg Pago 6 a-d Proximity Problem 5,

Equipment With Other Mumber Panel / Cabinet With Wall Resolution (l)

.2 I2238l2C185B MA MA MA 1C266 MA MA MA 2C266 MA MA MA 1C111 MA MA MA 2C111 MA MA NA 1C112 MA MA NA 2C112 MA MA MA 1C231 NA NA MA 2C231 MA NA MA IC232 MA MA MA 2C232 MA MA NA 1C41 MA MA MA 2C41 MA MA MA IC45 MA MA MA 2C45 MA NA NA Motes:

(1) Resolution item numbers refer to corrective action item numbers l

described in the MCAR Interim Report.

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(2)These panels will not be relocated. Resolution of proximity problems is accomplished with relocation of 1/2C42.

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