ML20053E032
| ML20053E032 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 05/13/1982 |
| From: | Spencer W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-SSINS-6820 275, IEB-80-08, IEB-80-8, NUDOCS 8206070545 | |
| Download: ML20053E032 (5) | |
Text
USNRC REGION "
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May 13, 1982 v..
Mr. James P. O'Reilly Serial No. 275 Regional Administrator PSE&C/TAE:bw U.S. Nuclear Regulatory Comission Region II 101 Marietta Street, Suite 3100 Docket No. 50-404 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
IE BULLETIN 80-08 EXAMINATION OF CONTAINENT LINER PENETRATION WELDS NORTH ANNA UNIT 3 This letter is intended to meet the mquimments of the IE Bulletin 80-08, as it pertains to North Anna Unit 3.
This letter also supersedes letter Serial No. 347/040780 dated May 28, 1980, in which Vepco stated that review of this Bulletin was suspended pending the feasibility study of North Anna Units 3 and 4.
Listed below are the three actions mquired of the licensee and the Vepco response for each one:
Item 1:
Detennine if your facility contains the flued head design for penetration connections, or other designs with containment boundary butt weld (s) between the penetration sleeve and process piping as illustrated in Figure NE 1120-1, Winter 1975 Addenda to the 1974 edition of the ASME B&PY Code.
Response: The design of the connection between the flued head and the sleeve is shown in Attachment 1.
Although the flued heads are not of the integral forging type, the butt welds in question are similar to those shown in Figure NE 1120-1, Winter 1975 Addenda to the 1974 ASME B&PV Code.
Item 2:
If an affinnative answer is mached for Item 1, detennine the following:
Item 2a.
Applicability of the ASME Code including year and addenda and/or Regulatory Guide 1.19.
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Response: The North Anna Power Station Unit 3 complies with positions C.2a and C.2b of Regulatory Guide 1.19,
" Nondestructive Examination of Primary Containment Liner Wel d s".
References to the ASE Code in Regulatory Guide 1.19 are general. The ASME code in effect and used for North Anna 3 design is the 1971 ASE Code including 1972 Sumer Addenda.
Item 2b: Type of nondestructive examinations perfomed during construction.
Response: The welds, as described in question 1, were all shop fabricated. Nondestructive examination of the welds consisted of 100 percent isotope radiographic examination.
I Item 2c: Type of weld joint (including pipe material and size) and whether or not backing bars were used.
Re sponse: The weld joints consist of full penetration butt welds with backing bars as shown in Attachment 1.
The pipe materials and sizes are listed in Table 1 (Attachment 2).
Item 2d: Results of construction nondestructive examination, i.e.,
if repairs were required, this should be identified including extent of repairs and description of defects encountemd during repair, if known.
Response: Upon review of the vendor's radiographic examination reports, 8 of the 22 installed sleeved penetrations showed at least one unacceptable radiograph. All of the listed defects were categorized as gas, slag, or porosity type defects.
Each unacceptable weld was repaired and reradiographed verifying acceptability of the weld.
Item 3:
For those facilities committed during construction to perfom volumetric examination of such penetrations thmugh SAR commitments which have not perfomed radiography, justify not perfoming radiography or submit plans and schedules for perfoming radiographic examinations.
Response: The North Anna 3 Power Station has radiographed the welds in question as reflected in the response i.o Item 2b.
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In sumary, all welds of the type addressed in this Bulletin 4
i received 100 percent isotope radiographic examination during fabrication and were reradiographed after any rework.
Very truly yours, jp$ }lb l
W. C Spencer 2
cc: Mr. Robert L. Tedesco Division of Licensing 1
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TABLE 1 VEPCO-NORTH ANNA NUCLEAR POWER STATION UNIT NO. 3 INSTALLED SLEEVED PENETRATl'ONS'
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Penetration Sleeve Pipe No.
Size Schedule Material Size Schedule Material Notes 1
50" 7/8" TP.304SST.
33" 1 1/2" C.S.
2 50" 7/8" TP.304SST 33" 1,1/2" C.S.
3 50" 7/8" TP.304SST 33" 1 1/2" C.S.
4 50" 7/8" TP.304SST 33" 1 1/2" C.S.
5
. 34" 3/4" TP.30'SST 18" 100 C.S.
6 34" 3/4" TP.304SST 18" 100 C.S.
7 22" 1/2" TP.304SST 6"
80 C.S.
8 22" 1/2" TP.304SST 6"
80 C.S.
27 24" 1/2" TP.304SST 10" 160 TP.316SST' 28 24" 1/2" TP.304SST 10" 160 TP.316SST
.29 26" 1/2" TP.304SST.
12" 405 TP.304SST 49 8"
40 C.S.
1/4",1/4",1/4",1/4" 805
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50 8"
40
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1/4",1/4",1",1" 805/80 TP.316SST/C.S. Multiple 51 10" 40
40 C.S.
80 14" 3/8" TP.304SST 2"
160 TP.316SST
.94 8"
40 C.S.
3/4",3/4",3/4",3/4" 160 TP.316SST Multiple (2 Spares l 96 14" 3/8" TP.304SST Spare Sleeve Only 100 8"
40 C.S.
1/4",1/4",1/4",1/4" E03 TP.316SST Multiple (3 Spares l i
108 18" 3/8" TP.304SST Spare Sleeve Only 112 14" 3/8" TP.304SST Spare Sleeve Only 126 26" 1/2" TP.304SST 12" 405 TP.304SST l
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