ML20096A430
| ML20096A430 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 08/23/1984 |
| From: | Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| REF-PT21-84-427-000 (SDR-#148), OL, PT21-84-427, PT21-84-427-000, NUDOCS 8408310110 | |
| Download: ML20096A430 (1) | |
Text
$
=
2840798540 PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET P.O. BOX 8699 1881 1981 PHILADELPHI A PA.19101 (215)841 4502 wICE PRESIDENT
- ......m.......
AUG 231984 Dr. Thcons E. Murley, Director United States Nuclear Regulatory Ca mission Office of Inspection and Enforcenent, Region I 631 Park Avenue King of Prussia, PA 19406
Subject:
Significant Deficiency Peport No. 148 Design Calculation Discrepancy on Woolley Doors Attachments:
Ictter: W.J. Woolley Canpany to the UStBC, Dated 07/05/84 File:
QUAL 2-10-2 (SDR #148)
Dear Dr.Murley:
The attached letter has brought to our attention a discrepancy in the design calculations made by the W. J. Woolley Canpany for doors specified to meet tornado-generated missile criteria.
This discrepancy has previously been reported to the USNRC by the p
W. J. Woolley Coupany under the provisions of 10CFR21.
We consider the deficiency described in the attachment as a significant deficiency per 10CFR50.55(e) and are hereby notifying you, as required.
We believe that the W. J. Woolley Caupany report subnitted under the provisions of 10CFR21 provides the information required for 10CFR50.55(e) reporting.
Therefore, we anticipate that this letter will be our only report to you on this subject.
We are currently performing a reanalysis of the missile doors in question to determine if they meet all FSAR requirem:nts.
Sincerely, WSS/drdO8218404 Ig Attachment Copy to: Director of Inspection and Enforcement United States Nuclear Regulatory Cm mission Washington,.~DC 20555 S. K. Chaudhary, Resident NRC Inspector (Limerick)
J. Wiggins, Resident NRC Inspector (Linnrick) 8408310110 840823 i
PDRADOCK05000g 6 00 I
p.
y
.w n
~...
.s
..... ~.
~.N g.-
ar i
g
,. / ~.
)
. %\\ \\r~
~.
1 % __. 1.
-- k ly5,719s'
-. /.t" - ~ <..
/ -
QA,0y.r,..; j.py;3 2840798540 Mr. J. C. Keppler, Regional Administrator U. - S. Nuclear ReEulatory Cercission Office of Inspection and Enforce ent 799 Roosevelt = Road Clen Ellyn, Illinois 60137 s
Dear Mr. Keppler:
In' accordance with the requirements of 10CFR21, I am forwarding herewit.h a copy of Surnary of Calculational Errore For Missile Doors, dated July 5,1984.
The discovery of these errors and potential
~
safety i= pact was reported by phone to your Mr. R. C. Kanop on June 29,1984.
Tbe attached su= mary provides a description of. the discovery and evaluation of the calculational errors and the 'possible impact upon the design and functional requirements for missile shield doors for the Licerick and Shearon Harris nuclear power plants.
The missile protection doors, as defined in the attached su==ary, have been designed, fabricated, delivered and partially erected for the referenced nuc1:Or pcuer plants.
Neither of the referenced power plants are presently in operation, and therefore, these errors do not presently present a possible safety hazard to the public.
An update of the evaluation of the calculational errors will be submitted on or before August 1,198'4 If there are any questions, please contact =e at our new location, 4413 Kings Run Drive, Cincinnati, Ohio 45232, telephone 513/ 641-0500.
s Very truly yours, f
MN O
~
Dwaine A. Godfrey Vice President hw enclosures:
2 copies W/ Summary bcc:
E. Rountree
- 7. Utech 9
sn~~ s.i.l,r-Ti~,~./ 4 ; s'! ' 7 '
y ce t CBN 7tt,e)n n i
,4;k. '. 'y1 c 7,,,/ * /4,v
WJ. Wooiley Co.
=
- wes 22ne siteet ca6 stooy. smeis sci 2u Te'ephone 3N 654 2700
- TWX 910 E510225 Amt er ac v.J v.COLLD C AK A 6
g b) v, A.y 0"f f r f :! r.
f
,-aw i
b
e
. Calculaticr.nl - Crrors Tor "::::le Shield Decrs 2*r. nary;o a
- ~
_ Ey W. J. Wooli cy Company '
pg4QJ$8$4O July 5, lose On June 25, 1954 a difference in the preliminary designed thickness requirements for missile shield doors for an on going project was discovered to be greater than similar_ missile shield doors'for previous projects designed by another engineering group.
This dif-Terence was reported to Mr. Dwaine Godfrey, Vice President.
Mr. Godfrey reported this difference to the President of the Company:and requested am engineering evaluation to determine if possible engineering errors existed.. A review meeting was scheduled on June 27. -During this meeting, it was concluded that apparent engineering errors were made on the previous designs and was duplicated on subsequent designs.
An
-immediate review of the design and the affected doors and plants was initiated.
The results of this review were reported by phone to Mr. R. C. Kanop of the NRC Regional Office, Chicago on June 29, 1984.
The errors are ~ associated with calculating the plastic moment resistance of a uniform rectangular plate.
The plastic moment resistance is then used to _ verify that the calculated ductility ratio is within the specified limit. A preliminary review reveals that the corrected
_ plastic moment capacity results in a ductility ratio greater than the specified limits for some of the missile shield doors.
Further redesign will be required to determine the extent of exceeding the specified design allowables.
The nuclear power plants and the related missile shield doors are summarized as follows:
I. - Limerick Generating Station, Units 1 and 2 s
Missile Shield Doors identification numbers 193, 195, 196, 205, 289, 293, 294 II. - Shearon Harris Nuclear Station fs,,'[ e
' h asile Shield Doors identification numbers 57 90, 92, 232, 250, 312, 321, 462,-463 t
r,7 The completion of the design review, redesign and corrective measures, if required, will be dependent upon establishing appropriate modifica-tions for those missile shield doors that fail to comply with the allowable design limits.
A summary update will be submitted on or
- before August 1,1984.
l i
I k-J
p-i x.
.., s.,;..a Ser.sry Of Cal culotter.a1 Errers.
'l e
'. July $;M c84-
,n Pace Two-
^
2840798540 JMissile' Shield' doors are prsvided usually at opening on safety related structures and prevent the ingress of. postulated missiles
' generated: by-;a tornado. : Su:.. a cirsile is postulated te be a 6
' telephone' pole, steel pipe, steel rod,. lumber or autcmobile.
The
-specifics are defined in the design. requirements and Safety Analysis' Report..
Neither of the above referenced plants are in operation and these.
~ design errors presently do not present a safety hazard to the-Eeneral public..
hw s.
.E i
s
- - - - - - - - - - - '