ML20072Q775

Final Deficiency Rept Re Threaded Studs W/Insufficient Threaded Engagement Into Embedded Strip Plates.Initially Reported on 811013.All Deficient Plates Marked W/Stickers. Site Work Procedures Revised

ML20072Q775
Person / Time
Site:	Harris
Issue date:	03/29/1983
From:	Parsons R CAROLINA POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
CON-NRC-49 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8304050317
Download: ML20072Q775 (4)

Text

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-f' Cp&L Carolina Power & Light ce.spany h

P. O. Box 101, New Hill,-N. C.

27562 9@k (d

March 29, 1983 1

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.e Mr. James P. O'Reilly NRC-49 Pp United States Nuclear Regulatory Commission Region II 101 Marietta Street, Northwest (Suite 3100)

Atlanta, Georgia-30303 CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT 1986 900,000 KW - UNITS 1 & 2 THREADED STUDS WITH~ INSUFFICIENT THREADED ENGAGEMENT INTO EMBEDDED STRIP PLATES, ITEM 63

Dear Mr. O'Reilly:

Attached is the final 10CFR50.55(e) report on the subject deficiency which describes the problem and the corrective action taken to accomplish resolu-tion. With this report, Carolina Power and Light Company considers this matter closed.

If you have any questions regarding this matter, please do not hesitate to contact me.

Yours very truly, g W : =&

R. M. Parsons Project General Manager Shearon Harris Nuclear Power Plant RMP/sh Attachment cc:

Mr. G. Maxwell (NRC-SHNPP)

.Mr. V. Stello (NRC)

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i CAROLINA POWER & LIGHT COMPANY-SHEARON HARRIS NUCLEAR POWER PLANT f

i UNITS NO. 1 AND 2 FINAL REPORT March 29, 1983 ITEM 63' s

THREADED STUDS WITH INSUFFICIENT THREADED ENGAGEMENT INTO EMBEDDED STRIP PLATES.

Reportable Under 10CFR50.55(e) J 4

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SUBJECT:

Shearon Harris Nuclear Power Plant / Units No. l' and 2 10CFR50.55(e),. reportable deficiency.-

l Thread, engagement of threaded studs into embedded strip. plates.

ITEM:

Improperly installdd threaded studs.on embedded i

strip plates. These tapped strip plates and

- I threaded studs have been used'in many cases in.

lieu of strip plates with welded-on Nelson headed 4

studs.

" SUPPLIED BY:-

Not a supplier-related. deficiency. The studs and strip plates.were assembled'in the field.

-NATURE OF: DEFICIENCY:

The deficiency involves SeismicfCategory I embedded; strip plates with' screwed-in studs that have.

insufficient thread engagement.- - These screwed-in studs are used in' lieu of welded-on Nelson headed I

studs.-'The d.eficie'nt! plates / studs were found after concrete placements and acceptance of the I-placements.

DATE PROBLEM WAS CONFIRMED TO EXIST:

October 13, 1981.

I DATE PROBLEM-REPORTED:

. October.13, 1981, Mr. N. J. Chiangi. notified the

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e NRC, Region II (Mr. R.. Butcher),.that the item l

was potentially reportable. -November 10, 1981,

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I Mr. N. J. Chiangi--. notifie'd the NRCi Region II.

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(Mr..-R. Butcher), that this item was' reportable per the provision of 10CFR50.55(e).-

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SCOPE OF PROBLEM:~

Approximately 1300 of the strip plates to be used with screwed-in studs have.been ordered.-zTo'date, r

all inspection has been completed in-the contain -

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ment, fuel handling, reactor auxiliarys reactor

. auxiliary-common,Mdiesel' generator, diesel fuel

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oil storage. tank, tank l'and-2l buildings,< intake'

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and screening ~ structures..A-large' number.of1 plates that have threaded studs'with improper

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thread engagement;have.been found. :Also, hangers

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have been foundEwelded'to plates that hav.ejthreaded:

studsnwith imprope.r thre63: engagement.

j' SAFETY-IMPLICATION:.

-Pipei' cable tray, and HVAC. hangers,.as;well'asi

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. other miscellaneous items, attach to these plates.,

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= Plates lwith studs not'having properf thread engage-

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ment will possibly;beloverstressedtin normal i.

operation or during afseismic: event.-

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~ REASON DEFICIENCY cIS REPORTABLE:

EReportable-due to.the magnitudeLofLthe problemt v

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,plus.the extensive' evaluation and/orirework required.1 J.

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• CORRECTIVE ACTION:

Appropriate site work procedures have been

' revised requiring notification ~of-site engi-neering personnel prior to attaching any item to an embedded plate with screwed-in studs.

In addition, all plates having insufficient thread engagement have been marked with stickers

• identifying them.. Plates having attachments have been identified and all have been evaluated by the' engineer using test data provided to them on shear resistance.- 'All eight plates previously identified as requiring corrective action have been reworked or accepted "as is".by a permanent waiver (PW).,To control attachments to these plates once-the plant becomes-operational, operations personnel have agreed to implement-inspection of the plates in their procedures prior to making any attachments.

• Note on sticker reads:

CAUTION Anchor studs for this plate have reduced thread engagement. Evaluate plate load limits prior to making any attachments.

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