ML20002E148
| ML20002E148 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 01/09/1981 |
| From: | Parker W DUKE POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, NUDOCS 8101260513 | |
| Download: ML20002E148 (3) | |
Text
D
~
.uma ?D '
DUKE POWER COMPANY Powza Bunntwo 84-04 4 ' Wa2 socra caunca s=zr.camom\\{.ca 5 86- 019- 03J,"
33M\\
m uu. o.maansa.sa.
January 9, 1981 Vict PetssetNT TELEP=ont:AmEA 704 Srtaae Poonucnon 373-4083 Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 Re: McGuire Nuclear Station Unit Nos. 1 and 2 Docket Nos. 50-369 and 50-370 t
Dear Mr. O'Reilly:
Pursuantto10CFR550./SepleasefindattachedSupplementNo.ItoSignificant Deficiency Report SD 369/80-21, and 370/80-16.
Very truly yours, WJ
/
William O. Parker, Jr.
THH:ses Attachment cc: Director T. J. Donat U. S. Nuclear Regulatory Commission NRC Resident Inspector Office of Inspection and Enforcement McGuire Nuclear Station
(
Washington, D. C.
20555 303 s
//
- FFICIAL COPY 610 2 e c 0543 g
l a-
,e-D 'P# D
~@ N SJY A d}
"3 Md a
muE noctEna STnT1m UNITS 1 & 2 IEPWT No: SD-369/80-21, 370/80-16 (Supplement 1 of 1) 1 REPORP DME: January 9, 1981 INITIAL NuralucIm DME: n,,amhar 17, 1980 EACILITY: M-mim Nuclear Staticn, Units 1 & 2 IDEhraluCIN & DEFICIE2CY: CanF=4= ant Vessel (CV) Dynamic Ihsmits Due
~
to Postulated Ioss of Coolant Accidant (IOCA)
Not Properly Cm sidered in Analysis of Criteria -
Analyzed Piping DESCRIPTIN T DEFTFT7NCY:
'Ihis report describes an increase in scope of a daficiancy in piping analysis Aar.u.Limi on Nuv=M 26, 1980 in Report No. SD-369/80-21, 370/80-16. 'Ihat daficiancy cmsisted of not eaideing ICCA effects in analysis of piping systems, apac4 fic=11y, pressure effects cm ha11r=-type E==-i.a.aticms.
In resolving that daficiancy it was hudned that Or*=inmant vaanal dynamic movements due to IOCA were not properly ea4dared in certain criteria - analyzed piping. Criteria-analyzed piping is 4-inch di=s=i.=. and less, icw tm+rai.ure, low pressure, =4 =ic piping which is analyzed by pipe span and support an= ring rules dafinad_ by Speci-fic=+ 4 m.
'Ihe cmly dynamic input to which the criteria are applicable is a seismic event. 9 hen M m"M the analysis originally, analysts assmed that applicable IOCA effects were static cnly.
Porticms of piping affected by this daficiancy are required either to ensure Cn*=4nnent integrity (between isolaticn valves) and/or to perform necessary functicms during or after a postulated IOCA. Eleven (11) piping analysis math wvlala require partial or total reanalysis for IOCA effects. Frm these math nrrlala, t;c hundred and seventee (217) support / restraints require design review /
revisim with sme hardware ch=w expected. Most support / restraint load changes l
are eaE= tial to be minor.
ANALYSIS T SAFETI IMPLICATIm Worst case safety ccnsequenm is that piping which either penetrates Centainment and/or is required to functicn during and/or after a postulated IOCA is not qualifiad_
for the Faulted Ccoditicn including IOCA effects. Support / restraints for this piping uny not be adequate for worst case inada and piping integrity for either require-ment cannot be assured ass ming inadequate support / restraint designs.
CORREITIVE ACTIm An analysis and design review pi+= has been initiated to ccmplete the following:
(1) Review the scope of criteria-analyzed piping inside of Ccntainment and identify those math =vlala ccx?=4ning piping which satisfies all of the following:
g January 9, 1981 h fl D
- D 7 ]A Page 2 J 4e L
1 j
g a) Pipe integrity is required to ensure Ccntainment isolation or_ pipe integrity is required to allow pipe to perform necessary fura.icn(s) during or after a postulated IOCA b) Pipe support / restraint (s) attach to the Ccntaiment Vessel (2) Perform rigorous (cmputeriTed) stress analysis of piping associated with Itan (1) to include IOCA dynamic effects pwi.e.u:ly. A pipe stress and support / restraint load factoring approach which was identifiad during initial nctific=*4m of this daficiancy was used -initially but was cmfimad by E -A ming the more accurate rigorous analysis cn all affected piping. Ccnfim adequacy of existing piping and define, as naca===ry, revised support / restraint locaticms and loads and revised 1maings cn structures to which the piping a**=chaa.
Ccnfim adequacy of structures to which the piping or support / restraints attach for any revised 1maima. Review and revise support / restraint designs as necessary to assure adequacy for any revised 1maings and locaticns.
(3) Make =ca===ry hardware changes to affected items.
(4) Revise the smc4f4c=ticn for criteria-analyzed piping to nere clearly dafina analysis requirements for postulated IOCA cmditicns and to avmnd the existing exclusicn of the criteria app 14c=h414ty to IOCA to require transfer to rigorous analysis scxpe analysis of piping subject to dynamic input due to IOCA or any other dynamic event other than =4=4c.
W'les for capleticn of the above Anx.i.ive actim items are as follows:
Corrective Acticn Item Ccepleticn Date Unit 1 Unit 2
- 1) Define Affected Piping Scope Ca plete 6/I/81 j
- 2) Piping and Support / Restraint Cm plete Per Unit 2 Analysis and Design Review /
Ccnstruction Revisicn Sc+adula
- 3) Hardware N nga=
1/28/81*
Per Unit 2 Ccnstruction W 31e 4)
MiF4caticn Revisicn 2/1/81
- Due to restricticns asscciated with Ccntaiment cleaning activities, scue support / restraints not required to assure integrity of systems which support -
Fuel Icad will be cmpleted shortly after this date.
l
.