ML20023D303

Interim Deficiency Rept Re Improper Installation Design of Class IE Electrical Control Cabinet/Panels.Initially Reported on 830211.Drawings Will Be Revised.Next Rept Will Be Submitted by 830819.Bechtel Rept Encl

ML20023D303
Person / Time
Site:	Midland
Issue date:	05/16/1983
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, 22189, 83-02-#2, 83-2-#2, NUDOCS 8305200349
Download: ML20023D303 (12)

Text

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Censumers Power f

i Pr sil - Projects, Engineering and Construction General offices: 1945 West Parnell Fload, Jackson, MI 49201 * (517) 788 0453 May 16, 1983 83-02 #2 Mr J G Keppler, Regional Administrator

-US Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND NUCLEAR C0 GENERATION PLANT -

DOCKET NOS 50-329 AND 50-330 NSSS AND BOP INSTRUMENT CABINT.TS FILE:

0.4.9.74 SERIAL:

22189

Reference:

J W Cook letter to J G Keppler, Serial 20697, dated February 11, 1983 This letter, as was 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 August 19, 1983 JWC/WRB/cd Attachments:

1)

MCAR 67, Interim Report 2, dated April 25, 1983.

CC Document Control Desk, NRC Washington, DC RJCook, NRC Resident Inspector Midland Nuclear Plant 8305200349 830516 PDR ADOCK 05000329 S

PDR

-Ltd]

OC0483-0037A-MP01 MAY 1 M983 l

l

2 Serial-22189 CC: CBechhoefer, ASLB Panel FPCowan, ASLB Panel JHarbour, ASLB Panel i

AS&L Appeal Panel MMCherry, Esq 3

MSinclair BStamiris CRStephens, USNRC WDPaton, Esq USNRC FJKelley, Esq, Attorney General SHFreeman Esq, Asst Attorney General WHMarshall GJMerritt, Esq, TNK8J 3-INPO Records Center

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4 OC0483-0037A-MP01 i

y Attach:nent 1 Bechtel Associates Professional Corporation li2S62 Is3Ilg

SUBJECT:

MCAR 67. Rev 1, issued January 13, 1983 Electrical Control Cabinet / Panel Clearances INTERIM REPORT 2 DATE:

Apell 25, 1983 FROJECT:

Consumers Power Company Midland Plant Units 1 and 2 Bechtel Job 7220 Introduction This report addresses the installation design of certain class 1E 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.

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 anaintain 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.

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Bechtel Associates Professional Corporation I i 3179. cia 67 Ii2962 Interim Report 2 April 25, 1983 j

Page 2 Historical Backaround and Susatary of Investiaation Modifications to the plant's design resulted in addition of Class 1E l

cabinets / pans 1s in the Midland plant. Review of the installation design of these cabinets /pancis 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 investigation of all Class 1E cabinets / panels was undertaken 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 guideline of BC-TOP-4A.

Further investigation is required to determine if a problem exists. There are a total of 254 Class 1E cabinets / panels

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of which 41 have been identified as hnving 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, do not clearly identify clearances to walls / cabinets.

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 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.

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Bechtel Associates ProfessionalCorporation

ii31JcAg, Ii2962 Interim Report 2 April 25, 1983 Page 3 Probable Cause The probable cause for these problems was the failure to identify the potential for interaction between Class 1E cabinets / panels and adjacent 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.

Corrective Action 1.

Determine the method of resolution using one of the following methods (see the attached table for preliminary status of all Class 1E panels / cabinets).

Moving the cabinets / panels to achieve the desired seismic l

a.

envelope b.

Providing additional support to the cabinet / panel to make it seismically rigid or adequate for existing qualification l

l Reanalyzing the existing ecafiguration considering the possible c.

impact loads.

(This action is being taken by Consumers Power Company.)

2.

Appropriate design drawings will be revised to reflect minimum clearances.

3.

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

a.

Revise the Midland Final Safety Analysis Report to clarify the requirements for clearance around Class 13/ Seismic Category I equipment.

b.

Notify all disciplines of criteria in the FSAR.

(It would then i

be covered by design requirements verification checklist completion.)

Revise project general seismic requirement specifications to c.

add a statement requiring suppliers to specify a clearance envelope around their Class 1E/ Seismic Category I equipment.

The method of resolution for all proximity problems covered by this MCAR will be selected and described in the next interim report by July 19, 1983.

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Bechtel Associates Professional Corporation Ii3179 meAns, Ii2962 Interim Report 2 April 25, 1983 Page 4 Reportabill_t1 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 qualification may no longer be valid. Thus, this condition, if uncorrected, could have a potentially adverse effect on the safety of operations in the event of an earthquake at the Midland plant. This condition is considered to be potentially reportable under the criteria of the Code of Federal Regulations, 10 CFR 50.55(e).

Submitted by:

4 fiXff G. #Singh Control Systems Group g)

Supervisor Approved by:

M

/- -

E.M. Hughes Project Engineer f

&wW concurrence by:

E.A.,,oure control Systems Chief Engineer

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.d Concurrence by:

E.H. Smith' Engineering Manager Concurrence by:

M M.A.'Dietrich J

Project Quality Assurance i

Engineer GS/SES/jsh*

Attachment:

Table - MCAR 67 Panel / Cabinet Proximity Status (Preliminary) 0155u mmwaren omv m m-.a._m__.mrn--rx,v - -- --

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Ath= hmalt t3 NCAR 67 IItcric R; port 2 P go 1 1i2962 NCAR 67 PANEL / CABINET PROIIMITY STATUS Ii3I79 (P =.=1NAar>

Proximity Problem Equipment With Other Number Panel / Cabinet With Wall Resolution 1C30 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 NA 1.c 2C43 2C42 NA 1.c 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 2B56 NA 1.b 2B56 2B24 NA 1.b 1853 NA Poured wall 1.b 1B54 NA Poured wall 1.b 1B23 1B55 NA 1.b 1B55 1B23 NA 1.b 1824 1B56 NA 1.b 1B56 1P24 NA 1.b 2B23 2855 NA 1.b 2B55 2B23 NA 1.b 1B63 OB69 NA 1.b 1B64 0868 NA 1.b 2B63 OB69 NA 1.b 2B64 OB68 NA 1.b OB65 MA Poured wall 1.b OB66 NA Poured wall 1.b 0868 1B64, 2B64 NA 1.b OB69 1B63, 2B63 NA 1.b l

2853 NA Poured wall 1.b l

2B54 NA Poured wall 1.b 1C42 1C43 NA 1.c 2C42 2C43 NA 1.c i

1891A 1B91C MA See Note 3 l

2B91A 2B91C NA See Note 3 1B91C 1B91A NA See Note 3 2B91C 2B91A NA See Note 3 l

1B92B 1B92D NA See Note 3 l

2B92B 2B92D NA See Note 3 l

1B92D 1B92B NA See Note 3 2B92D 2B92B NA See Note 3 j

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Attcchmelt t3 HCAR 67 I2ter12 R: port 2

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1 I 3 'I 7kulpment with Other Number Panel / Cabinet with Wall Resolution IC172A Location drawins does not specify clearances 2 1C172B 2

2C172A 2

2C172B 2

1C171A1 2

1C171A2 2

1C171B1 2

1C171B2 2

2C171A1 2

2C171A2 2

2C171B1 2

2C171B2 2

1C171C 2

2C171C 2

1C171D 2

2C17D 2

OC398A 2

OC398B 2

OC398C 2

OC398D 2

1C184A 2

1C184B 2

1C161A 2

2C161A 2

1C161B 2

2 2C161B gr OC10 NA NA NA OC20 IC11 1C21 2C11 2C21 1C12 l

IC22 l

2C12 2C22 1C13 1C23 2C13 2C23 1C14 1C24 l

2C14 2C24

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ICIS IC25 2C15 y

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Attuhmelt to MCAR 67 I2teric R: port 2 gjggg7 Pago 3 Proximity Problem ii3IdePeent With Other Number Panel / Cabinet With Wall Resolution OC29 MA NA NA 1C31 2C31 1C44 2C44 2C47 1C114 2C114 IC150 2C150 OC151 1C166 2C166 1C175A 1C175B 2C175A

,2C175B OC180 1C447A 1C447B 1C447C IC447D 1C468 2C468 2C447A 2C447B 2C447C 2C447D 1C453 2C453 1C454 2C454 OC398 1C445A 1C445B 2C445A 2C445B 1Y11 1Y31 1Y32 1Y13 0Y33 OY34 1C32 2C32 1843 IB89 1X55 1X51 1X53 r

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ggg$2 Iatcria R; port 2 Fego 4 Prozialty Problem 1i3179 Equipment With ther

-Number Panel / Cabinet With Wall Resolution 0X57 NA MA NA 1117 IB17 1D11 1D12 1Y10 1A05 1Y12 1Y14 1844 1B90 1X56 1X52 IX54 1X18 1B18 1D27 1D21 1D22 1D20 1Y20 1A06 2Y11 2Y31 2Y13 2B43 2889 2X55 2X51 2X53 2X17 2B17 2D11 2D12 2Y10 2A05 2Y12 2Y32 2Y14 OY36 OY37 2B44 2B90 2X56 2X52 2X54 0X58 2X18 2B18 v

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Att chaelt t3 MCAR 67 l.2hb2 htcri.9 Report 2 l

Pcgo 5 Proximity Problem

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_ T--%r Panel / Cabinet With Wall Resolution 2D21 MA NA MA 2D22 2D20 2Y20 2A06 2D25 2D02 2Y40 2D23 1D25 1D02 1Y40 1D23 2B80 2L121 1L121 1880 2D01 2D15 2D17 2D10 2Y30 2D13 3D15 1D17 1D01 ID10 1Y30 1D13 1BP03 1BPO4 2BD03 2BPO4 IL120 1B79 2L120 2B79 OB45 0B46 OY84 OY85 OY86 0X93 0X94 0X95 2C184A 2C184B IC185A 2C185A IC185B

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Attachmext to MCAR 67 Istcric Report 2 Pcgo 6

• t a e Broximity Problem kk9 StIrer Equipment 1,i31i9

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..n.1ec. bin.t vita v.11 R.s.1. tion 2C185B MA NA RA 1C266 2C266 1C111 2C111 1C112 2C112 1C231 2C231 1C232 2C232 1C41 2C41 1C45 2C45 v

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E91tr.:

1) Resolution item numbers refer to corrective action item numbers described in the MCAR Interim Report.

2) Ryery Item 1.a type resolution is being reviewed by Consumers Power Company for conversion to an Item 1.c type resolution.

3) Seismic qualification is being reanalyzed by the vendor.

Results of the analysis will be included in the next MCAR 67 interim report.

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