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
.
-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
9.
gv
.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)
N A
sho4osoa d 85o329 T i
$ku_
^
C
- N a
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
2
'I s
+, ' '
p 4
g
+. -
,-.m-y
+.a e
g y
g ye
.~
J f
^-1-.
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
~
e 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 with screwed-in studs have.been ordered.-zTo'date, r
all inspection has been completed in-the contain -
~
ment, fuel handling, reactor auxiliarys reactor
. auxiliary-common,Mdiesel' generator, diesel fuel
^
[
oil storage. tank, tank l'and-2l buildings,< intake'
=
and screening ~ structures..A-large' number.of1 plates that have threaded studs'with improper
~
thread engagement;have.been found. :Also, hangers
~
~
[.
~
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
?
. other miscellaneous items, attach to these plates.,
it
= Plates lwith studs not'having properf thread engage-
+
- ment will possibly;beloverstressedtin normal i.
operation or during afseismic: event.-
h
~ REASON DEFICIENCY cIS REPORTABLE:
EReportable-due to.the magnitudeLofLthe problemt v
[-
,plus.the extensive' evaluation and/orirework required.1 J.
^
pt L
y 6
^h
'T E
p' xy ilb f);
. E.
t
..., ~
, :.\\ '
- 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.
n i
b