ML20090H059

Interim Potential Deficiency Rept 55-84-12 Re Installation of Concrete Expansion Anchors in Floors W/Finishing Slabs. Initially Reported on 840604.Investigation Planned to Determine Extent of Problem

ML20090H059
Person / Time
Site:	Clinton
Issue date:	07/13/1984
From:	Hall D ILLINOIS POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
55-84-12, U-10177, NUDOCS 8407260085
Download: ML20090H059 (3)

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l 1605-L l lLLIN018 POWER COMPANY U-10177 CLINTON POWER STATION, P.O. BOX 678, CLINTON, ILLINOIS 61727 July 13, 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

Subject:

Potential 10CFR50.55(e) Deficiency 55-84-12:

Installation of Concrete Expansion Anchors in Floors with Finishing Slabs

Dear Mr. Keppler:

On June 4, 1984, Illinois Power Company notified Mr. D. .

Keating, NRC Region III, (Ref: IP Memorandom Y-20647 dated June 4, 1984) of a potentially reportable deficiency concerning the installation of concrete expansion anchors in floors with finish-ing slabs. 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 Baldwin Associates Resident Engineering (BARE) provided (IPC) with a list, identifying supports

- Illinois installedPower Company / topping slabs. The concern expressed that on finishing the installation of the concrete expansion anchors for these supports may not meet the embedment length as required by the-Sargent & Lundy (S & L) Specification.

Background

In February, 1984, Baldwin Associates Resident Engineering (BARE) provided Illinois Power Com3any with a-listing of supports installed on finishing / topping slais. This listing: identified the support, the length of the installed anchor, the thickness of the finishing / topping slab, and the amount of. anchor-installed.in rough concrete. Several of the expansion anchors' identified have an effective embedment length of zero (0) inches ~(i.e., if the i

thicknese-of the finishing / topping slab is subtracted from the required effective embedment length).

Specification.K-2944 requires the effective'embedment length of concrete expansion anchors.to be-determined from the.surfsce

of'the rough concrete.

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W lh 6~ [G. J iKepplerz . -

July 13,gl984

.NRC. -

I w :111'inois Power Company'(IPC): requested that'S'& L evaluate' 1

.forladequacyfthe~ mechanical component supports identified by i

LBARE. : Based on.the: data submitted, S & L has stated that none off F .; , ithe~ expansion anchors associated with the identified' mechanical:

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supports' met the specification requirement..

1 S'& L evaluated 58 installed supports for adequacy to design  ;

p, c . loads'. Of-the 58 supports evaluated, 14 were evaluated as

inadequate-for design loads.

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} Investigation Results/ Corrective-Action  ;

L Illinois. Power has prepared and is implementing an inves-tigacion plan-to' determine the extent of this problem at CPS.

The' investigation. plan' includes:

l 1. A review of construction' procedures governing the installa- -

tion / inspection.of concrete expansion. anchors.will be made- '!

g to determine adequacy and compliance.

I p 2. Based on the. rough as-built drawings already generatad, a

, complete. listing of all potentially affected equip-ment / components will be compiled.

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3. A complete set of composite as-built

drawings will be '

[j- generated which identifies all equipment / components-in ..

stalled on> finishing / topping-slabs which utilize concrete T expansion anchors for installation, b

4. The equipment / components identified bytthe. listing" generated l in item 2, will be entered into the computer in a search"

for all documentation'(i.e., NCR, FCR, etc.~) that may.have addressed these components.. . The documents identified by.the" l " search" will be reviewed toLidentifygthose do~cuments which address the problem of expansion' anchor embedment.

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5. All components'with expansion anchors that'violatelthe

effective embedment criteria and do.not'have prior? approval-documentation , 'will be'. documented - on Nonconformance :: Reports '

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(NCRs) and dispositioned per site procedure.

I The corrective action taken on-this issueito'date includes:.

-1. -Baldwin; Associates (BA).has--issued Memo MA'-31-84,. dated June

'6, 1984, remindingssupervisory personnel of-theTre~quirement-to instaillexpansion, anchors.into'the! structural slab in.

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order to achievef full embedment per S;&LL' Specification. ,

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K-2944,l Form CPS-1-CEA.

2.- . Procedure lBAP 2.16,.; Concrete? Expansion Anchor Work,.is being; ,

. revised co clarify the requirement thatoexpansion anchors'

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1 mast be installed in rough, concrete.' , _

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.l J -a Mr.cJ.1G. Keppler - -

-3 ' July 13, 1984 NRC.

~3. Instructions IPQAI 710-11, Concrete Expansion Anchor Overin-

-spection Checklist, and BAQI 190-1, Concrete Expansion Anchor-Field Verification, are in the process of being revised to provide the requirement to verify that expansion anchors installed in finishing slabs have full effective embedment.

Safety Implication / Significance Illinois Power Company's investigation of this potentially reportable deficiency is continuing. The safety implications and significance of the issue will be assessed after further back-ground information is evaluated. It is anticipated that approxi-mately six (6) months vill be-required to complete our inves-tigation and file a final report on the matter. Illinois Power Company. intends to provide you an update on the investigation in approximately ninety (90) days.

We trust that this interim report provides you sufficient background information to perform a general assessment of this potenticily repcrtable deficiency and adequately described our overall approach to. resolve this issue.

Sincerel yours,

. . Hall 4 Vice President RLC/skt cc: NRC Office Director, Office of I & E, USNRC, Washington, DC 20555 Illinois Department of Nuclear Safety INPO Records Center 4

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