ML20094D830

Interim Deficiency Rept 55-84-15 Re Installation of Skewed Auxiliary Steel Connections W/O Required Approved Design Details.Initially Reported on 840629.Investigation Plan Will Be Implemented to Determine Extent of Problem

ML20094D830
Person / Time
Site:	Clinton
Issue date:	07/26/1984
From:	Hall D ILLINOIS POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
55-84-15, U-10183, NUDOCS 8408080540
Download: ML20094D830 (2)

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- /LLIN0/8 POWER COMPANY U-10183 CLINTON POWER STATION, P.O. BOX 678, CLINTON, ILLINOIS 61727 July 26, 1984

Docket No. 50-461 Mr. James G. Keppler-Regional Administrator Region III U.S. Nuclear Regulatory Commission

'799 Roosevelt Road

" Glen Ellyn, IL 60137

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Subject:

Potential 10CFR50.55(c) Deficiency 55-84-15:

Skewed Auxiliary Steel Connections b-

Dear Mr'. Keppler:

-On June 29, 1984, Illinois Pnwer Conpany notified Mr. F.

?Jablonski,ENRC. Region III,-(Ref:

IP Memorandum Y-20708 dated

' June 29, 1984) of a potentially reportable deficiency concerning theLfabrication and installation of skewed auxiliary steel connections without the required approved design details.

Our

investigation of this issue is continuing, and this letter is submitted as an interim report in accordance with the requirements of 10CFR50.55(e) (3).

-Statement of Potentially Reportable Deficiency / Background The Clinton, Power Station (CPS) Constructor generated 13 LField Change Requests (FCRs) which indicate that 37 cable tray h_

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support and~221 conduit support hangers were installed in Seismic I areas utilizing skewed auxiliary steel connections.

LCategory wed auxiliary steel connections were' fabricated and (These'see

-installed without approved design details.

The Constructor used La. standard ~90*,

double angle connection detail from Sargent &

Lundy (S&L) drawing E05-1912 as a guide in bending the clip angles tolthe angle required.co suit the configuration of the auxiliary steel in the field.

The final as-built skewed connection,:neither conforms to approved design details, nor to

-standard suggested skewed connection details of the AISC Manual.

Investigation Results/ Corrective Action Illinois Power has prepared and is implementing an

investigation plan.to determine the extent of this problem at L CPS. - The investigation plan includes

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A~ review will be performed to identify all conduit and cable

tray supports, utilizing skewed auxiliary steel connections that were installed-without approved design details.

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Mr.iJcmes1G. Keppler

. Page 2 July 26, 1984 m

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Nonconformance. Reports-(NCRs) will be generated to document da Ethose nonconforming or. indeterminate connections identified 1

lbyLitem #1.

These NCRs will be resolved:in accordance with

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approved. site. procedures.

1' 13.

(S&Lwillianalyze'andevaluateeachas-builtconnection, f

. identified'in item fl, for adequacy.to carry design loads.

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Baldwin Associates Quality Assurance Group will evaluate "thisipotential problem with respect to similar skewed connections which may have been installed by other l

disciplines.

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. Corrective action taken on this issue to date includes the tissuing of Field Engineering Change Notice l(FECN) No. 4986 covering generic skewed.connectionLdetails.that will be. utilized 2

>for;all future installations of cable tray supports.

S&L-is also f

(preparing another generic 1FECN covering skewed connection details

.for. future installation-of. conduit-supports.

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? Safety Implica'tions/ Significance Illinois-Power Company's-investigation of this potentially

" reportable deficiency is continuing.

The safety implications and

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significance.of the' issue.will be assessed after further ibackground;information.is: evaluated._ It is anticipated that

tapproximatelyfninety;(90) days'will be necessary toicomplete our w-

. 1 investigation and to file a final' report on the matter.

MWe trust ~that thisLinterim' report _provides you sufficient

. background information.to perform-a general assessment of this potentially'. reportable deficiency and~ adequately describes our overall'approachcto resolve the problem.

Sincerely yours, x

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P. Hall Vice President f'

!.RLC/cah-Lc'c: ~ NRC; Resident Office-

. Director, Office ofDI&E,-US NRC, Washington, DC 20555 Illinois Department of. Nuclear Safety

.INPO Records Center.

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