ML20080P741
| ML20080P741 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 09/19/1983 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Sternberg D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, ANPP-27836-BSK, DEF-83-34, DER-83-34, NUDOCS 8310070339 | |
| Download: ML20080P741 (4) | |
Text
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Arizona Public Service Corppany PHOENIX. art 2'ON'k 88Ch 28 p;; p, ;
PO. BOX 21666 +
SeptemSEhd9,1983 ANPP-27836-BSK/RQT U. S. Nuclear Regulatory Commission Region V Creekside Oaks Office Park 1450 Maria Lane - Suite 210 Walnut Creek, CA 94596-5368 Attention: Mr. D. M. Sternberg, Chief Reactor Projects Branch 1
Subject:
Final Report - DER 83-34 A 50.55(e) Report Relating To Instrument Racks In Unit 2 Containment Have Surface Cracks On Various Welds to Embed Plates File: 83-019-026; D.4.33.2
Reference:
(A) Telephone Conversation between T. Young and J. Cook on May 27,1983 (B) ANPP-24179, dated June 27, 1983 (Interim Report)
Dear Sir:
Attached is our final written report of the deficiency referenced above, which has been determined to be Not Reportable under the requirements of 10CFR50.55(e).
Very truly yours, OL.c ( _
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E. E. Van Brunt, Jr.
APS Vice President, Nuclear Projects Management ANPP Project Director EEVB/RQT:sn Attachment cc: See Attached Page 2 r310070339 830919 1
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8-Mr. D. M. Sternberg DER 83-34 Page 2 cc:
Richard DeYoung, Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 T. G. Woods, Jr.
G. C. Andognini J. A. Roedel D. B. Fasnacht A. C. Rogers B. S. Kaplan W. E. Ide J. Vorees J. R. Bynum D. D. Green /P.'P. Klute A. C.'Gehr W. J. Stubblefield W. G. Bingham R. L. Patterson R. W. Welcher R. M. Grant D. R. Hawkinson L. E. Vorderbrueggen -
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A'. Fiorelli S. R. Frost J. Self D. Canady Records Center Institute of Nuclear Power _ Operations 1100 circle 75 Parkway - Suite 1500 Atlanta, Georgia - 30339 i
s FINAL REPORT - DER 83-34 DEFICIENCY EVALUATION 50.55(e)
ARIZONA PUBLIC SERVICE COMPANY (APS)
PVNGS UNIT 2 I.
CONDITION DESCRIPTION Post acceptance surveillance inspection of instrumentation racks, supplied by Combustion Engineering (C-E), and installed by Bechtel Power Corporation (BPC), within Unit No. 2 Containment Building revealed various surface cracks in the weld areas. The instrument racks were identified by the following tag numbers Z CE-A05 SBB-A02 SBA-A01 SBA-A02 SBB-A01 SBC-A04 SBB-A03 SBD-A01 SB D-A03 SGE-A01 Welding was performed in accordance with the specified AWS D.1.1 Code on the C-E drawings. Unit No. 2 instrument racks welding was performed using the Gas Tungsten Arc-Weld (GTAW) process.
Instrument racks on Unit No. 1 were welded using the Shielded Metal Arc-Weld (SMAW) process. The Unit No. 1 instrument racks exhibited no cracking during post surveillance inspection. Both processes are acceptable under the Code for joining dissimilar metals (stainless vs carbon steel).
II.
ANALYSIS OF SAFETY IMPLICATIONS The preliminary investigation of Unit 2 installation revealed that a few surface cracks (hot cracking) developed after welding inspection was performed.
In addition, it was determined that the cracks were in ef fect fissures. This condition was attributed to a combination of operator technique and the unique configuration of the weld joints for the GTAW process.
C-E drawing E-14273-510-001, Rev. 4, specified that no linear indications or cracks were permitted in the weld. Accordingly, the racks may not have had sufficient weld strength to withstand an SSE.
The condition was corrected by removing the defective welds and rewelding using the SMAW process.
This condition is evaluated as not reportable under 10CFR50.55(e) since extensive repair was not necessary and the cracks were found prior to release from Constructions's control.
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Final Report DER-83 Page 2 III. CORRECTIVE ACTION 1.
NCR WC-746 has been dispositioned to repair the defective welds as described in Part II.
2.
A copy of this report.will.be transmitted to the Bechtel Construction Manager to preclude recurrence on the. Unit 3 installation.
3.
A copy of this. report will be transmitted to C-E for their information.
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