ML20099C388
| ML20099C388 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 11/15/1984 |
| From: | Tucker H DUKE POWER CO. |
| To: | Adensam E, Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8411190512 | |
| Download: ML20099C388 (7) | |
Text
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DUKE POWER GOMPANY e.o. nox aatso CHARLOTTE, N.C. 28242 HALH. TUCKER m rentoxe voca camminest (yo.3) ayum3g mixassa emonoxvion November 15, 1984 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commissicn Washington, D. C. 20555 Attention:
Ms. E. G. Adensam, Chief Licensing Branch No. 4 Re: Catawba Nuclear Station Unit 2 Docket No. 50-414 Preservice Inspection Program
Dear Mr. Denton:
Please find attached a request for relief from a requirement of the ASME Code for certain Class 2 circumferential butt welds for the Catawba Unit 2 Preservice Inspection Program.
Very truly yours, g6 /h.
Hal B. Tucker RWO/mj f Attachment cc:
Mr. James P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 NRC Resident Inspector Catawba Nuclear Station Mr. Jesse L. Riley Carolina Environmental Study Group 854 Henley Place Charlotte, North Carolina 28207 Mr. Robert Guild, Esq.
Attorney-at-Law h0{
P. O. Box 12097 0
Charleston, South Carolina 29412
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8411190512 841115 gDRADOCK 05000414 PDR
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Mr. Harold R. Denton, Dirzetor November 15, 1984 Page -Two-cc: Palmetto Alliance 2135 Devine Street Columbia, South Carolina 29205
Serial No. CN-1-005 Page 1 of 2 DUKE POWER COMPANY Request For Relief From inservice inspection Requirement Station: Catawba Nuclear Station Unit: #2 Reference Code: ASME Boiler and Pressure Vessel Code Section XI 1974 Edit. ion including Addenda through Summer 1975.
1.
Component for which exemption is requested:
a.
Name and identification Number:
thin Steam Piping See Attachment 1 for complete list of assemblies and welds b.
Function:
Main Steam Pressure Boundary c.
ASME Section lil Code Class:
Class 2 d.
Valve Category:
N/A
- 11. Reference Code Requirement that has been determined to be impractical:
Table IWC-2600 Item #C2.1 requires volumetric examination for circumferential butt welds. Table IWC-2520 examination category C-G requires that the area of interest include the weld metal and base metal for one wall thickness beyond the edge of weld. One wall thickness beyond the edge of weld cannot be maintained on all radiographs due to accessibility of the welds.
Ill. Basis for Requesting Relief:
The Inservice Inspection Plan will be written to the ASME Boiler and Pressure Vessel Code Section XI 1980 Edition including Addenda through Winter 1980 or later.
The examination area required by this code is the weld plus 1/4 inch on each side, as shown in Figure IWC-2500-7.
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Because of limited accessibility due to guard pipe covering these welds, the volumetric examination of the full 1 "T" required by the Summer 1975 Code cannot be accomplished. Adequate assurance of the weld integrity can be provided by meeting the volumetric requirements of the Winter 1980 Code.
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SarIal-No. CN-1-005 Page 2 of 2
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Basis for Requesting Relief (cont.)
J l-IV.
Alternate Examination:
Radiography will be performed in accordance with the volumetric examination j
requirements shown in Figure IWC-2500-7 welds in piping,'of the 1980 Edition of ASME XI, including Addenda through Winter 1980.
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Implementation Schedule:
For Preservice Inspection these Class 2 welds will be radiographed to the l
Winter 1980 Code to be used for the baseline data.
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Request for Relief m-1-005
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Attachment #1 The following is a list of circumferential butt welds which the volunetric examination (Radiography) may not cover the base metal for onewallthickness beyond the edge of weld, for each Radiographic interval:
Assetbly Weld No.
Geometric Configuration
' Size Steam Generator A W-SM-1A-F Pipe to Elbow 32" Main Steam CW-SM-1A-I Elbow to Reducer 32" G-SM-1A-K Reducer to Pipe 34" Steam Generator B CW-SM-1B-F Pipe to Elbow 32" Main Steam CW-SM-1B-I Elbow to Reducer 32" CW-SM-1B-K Raducer to Pipe 34" Steam Generator C CN-SM-1C-F Pipe to Elbow 32" Main Steam CW-SM-lC-I Elbow to Reducer 32" CN-SM-lC-K Reducer to Pipe 34" Steam Generator D CW-SM-lD-F Pipe to Elbow 32" Main Steam CN-SM-lD-I Elbow to Reducer 32" CW-SM-lD-K Reducer to Pipe 34" 1
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~l-V cd-j coS REQUIREMENTS FOR CLASS 2 COMPONENTS Fig. IWC-2500 7 E xam. surf.
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FIG.TlWC-2500-7 WELDS.IN PIPING l
129
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