ML20072Q775
| 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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Carolina Power & Light ce .spany h , .
P. O. Box 101, New Hill,-N. C. 27562 #
March 29, 1983 9@k (d
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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 e
DATE PROBLEM-REPORTED: . October.13, 1981, Mr. N. J. Chiangi. notified the
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. NRC, Region II (Mr. R.. Butcher),.that the item -
l was potentially reportable. -November 10, 1981, ~
I Mr. N. J. Chiangi--. notifie'd the NRCi Region II . ,
} (Mr..-R. Butcher), that this item was' reportable per the provision of 10CFR50.55(e).- ~
SCOPE OF PROBLEM:~ Approximately 1300 of the strip plates to be used r
with screwed-in studs have.been ordered.-zTo'date, '
- - 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' 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:
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studsnwith imprope.r thre63: engagement. .
j' SAFETY-IMPLICATION: . -Pipei' cable tray, and HVAC. hangers,.as;well'asi
? . other miscellaneous items, attach to these plates., .
it = Plates lwith studs not'having properf thread engage-
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- ment will possibly;beloverstressedtin normal
- i. operation or during afseismic: event.- -
h ~ REASON DEFICIENCY v cIS REPORTABLE: EReportable-due to.the magnitudeLofLthe problemt ' *
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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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