ML20098G635
| ML20098G635 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 09/18/1984 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Bishop T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| REF-PT21-84-472-000 ANPP-30551-TDS, DER-84-38, PT21-84-472, PT21-84-472-000, NUDOCS 8410050255 | |
| Download: ML20098G635 (6) | |
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RSCEIVED l120 Arizona Public Service Company 1984 SEP 21 F. 3: 45 2
September 18, 1984 EE G 0 M 'I M' ANPP-30551-TDS/TRB U. S. Nuclear Regulatory Commission Region V Creekside Oaks Office. Park 1450 Maria Lane - Suite 210 Walnut Creek, California 94596-5368 Attention: Mr. T. W. Bishop, Director
~ Division of Resident Reactor Projects and Engineering Programs
Subject:
Final Report - DER 84-38 A 50.55(e) Reportable Condition Relating To Improperly Welded Flange In Unit 2.
File: 84-019-026; D.4.33.2
Reference:
A) Telephone Conversation between P. Narbut and T. Bradish on
-May 25; 1984 B) ANPP-29814, dated June 25, 1984 (Interim Report)
C) ANPP-30307, dated August 23,1984 (Time Extension)
~
Dear Sir:
Attached is.our final written report of the Reportable Deficiency under
- 10CFR50.55(e), referenced above.
Very truly yours, l
b
(
Cm E.- E. Van B runt, Jr.
APS Vice President Nuclear Production-ANPP Project Director-EEVB/TRB/nj
~ Attachment cc: See Page Two 8410050255 84091s 1'.
PDR ADOCK 05000529
_. 8 PDR I
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Mr. T. W. Bishop DER ' 84-38 Page Two' cc:
_ Richard DeYoung, Director Office.of Inspection and Enf orcement U. S. Nuclear Regulatory Commission Washington, D. C.
20555 T. G. Woods, Jr.
D. B. Karner W. E. Ide D. B. Fasnacht A. C. Rogers L. A. Souza D. E. Fowler--
T. D; Shriver C. N. Russo J. Vorees J. R. Bynum J. - M. ' Allen J. A. Brand D. N. Stover A. C. Gehr W. J. Stubblefield.
W. G. Bingham R. L..Patterson -
-R. W. Welcher H. D. Foster D. R. Hawkinson L. E. Vorderbrueggen R. P. Zimmerman S. R. Frost t
l L. Clyd:-
M. Woods
.T.- J. Bloom Records Center Institute of Nuclear Power Operations l.
1100 circle 75 Parkway, Suite 1500
' Atlanta, GA 30339 L
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FINAL REPORT - DER 84-38 DEFICIENCY EVALUATION 50.55(e)
ARIZONA PUBLIC SERVICE COMPANY (APS)
PVNGS UNIT 2 I.
Description of Deficiency Pipe support #13-AF-005-H-007, Rev.1, was installed and accepted in Unit 2 by Field Engineering and Quality Control in November of 1981. The existing documentation required the miscellaneous steel-(Item A) to be installed at an evaluation of 85'-0 3/4" and the beam attachment of sway strut (Item 61) to be velded to Item A on the north and south sides (see Figure 1). Documentation was prepared in March of 1984 to partially disassemble tids support for piping rework. Upon completion of the piping work and reassembly of the support, two discrepancies in the original installation were noted in NCR PC-8250:
- 1. The miscellaneous steel (Item A) is installed at elevation 85'-3".
- 2. The rear bracket (of Item 61) is welded on the east and west sides.
The root causes of the deficiency described herein are (a) the craf tsman did not install the pipe support per design drawings and (b) the field engineer and the quality control inspector approved the incorrect installation. A recent investigation revealed that none of the people responsible for this deficiency are presently employed at the PVNGS jobsite.
The results of the inspection conducted in III.B, and the surveillances conducted in accordance with III.E.2 below, did not identify any other similar conditions. Theref ore, it has been determined that this is an isolated incident.
II.
Analysis of Safety Implications The change 'in elevation of miscellaneous steel (Item A) also -
lengthened the overall dimension from beam bracket to centerline of pipe of sway strut (Item 61) from 2'-8 3/4" to 2'-11".
' This causes no additf onal loading or induced stresses in Item A and the existing sway strut length is still within vendor requirements for the design loading condition so the structural integrity.: the pipe support is not degraded.
s:
Mr. T. W. Bishop -
DER. 84-3 8
' Page Two' However, with the beam attachment welded on the east and west sides, the bottom flange of Item A will not induce loads to the structural member as intended. This results in exceeding the' structural capacity of.the bottom flange during a DBE.
L 0nce the capacity of - the' support has been exceeded, piping
- stresses will reach unacceptable levels. Based upon the a bove, this condition is evaluated as reportable under the requirements of -10CFR50.55(e); since, if lef t uncorrected, it would. be a significant safety hazard.
This deficiency is evaluated as not reportable under the requirements of.10CFR Part 21, since this piping system had not been released f rom Bechtel control.
. III.
Corrective Action A. NCR PC-8290 will be dispositioned repair to add additional weld on the north and south sides of the' beam attachment.
B. As part of she corrective action identified in the response -
to the NRC Enforcement Letter and Notice of Violations, dated.12/12/83 (Violations II.B.3 and II.B.4), Bechtel Construction initiated a comprehensive reinspection program established under WPP/QCI 543.0 This reinspection program included 2199 pipe suports and pipe racks in Unit 1 All
-nonconf orming conditions noted during the reinspection program were documented on NCRs PX-7370 and PA-7313. The "as-built" calculations indicate that the Installed conditions of all-welding nonconformances are sufficient to carry the project design loads. Therefore. the installed
- pipe supports were found to be acceptable without repair.
lC.' To provide a similar reinspection program for Units. 2 and 3, Bechtel Construction has initiated WPP/QCI 555.0 - PCN 1 L
and -WPP/QCI 556.0 - PCN 1. - This reinspection program will.
include 1209 pipe supports:per Unit, and. will 'specifically verify all weld locations, sizes, and lengths. Any nonconformance found will cross-reference this DER for reportability. disposition..
D..To improve inspection standards in Units 1, 2, and 3, the '
.following training sessions including ~ spec alized training i
by Bechtel's. Material and' Quality Services (M&QS) on s
inspection techniques have been conducted with QC and Field Engineering personnel:
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. DER 84-38:
Page Three
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'l. October 10, 1983^- Instruction of Pipe Support and Welding QCEs' by Bechtel M&QS on proper use of fillet weld gauges and on visual weld inspection criteria?
- 2. October 17,.1983 - Instruction of Pipe Support and Welding QCEs and Weldicg FEs by Bechtel M&QS on proper use of M&QS weld gauge for skewed fillet welds.
- 3. December 7,1983 - Reinstruction of Pipe Support and Walding QCEs -by PFQCE on weld reinspection acceptance criteria.
- 4. December 14,~1983 - Reinstruction of Pipe Support and Welding QCEs by Lead Welding QCE-on pipe support i
accept / reject criteria.
' E. To preclude recurrence of identified conditions and improve and direct the Quality Assurance activity relative to the -
installation and QC ' acceptance of pipe supports.and other key construction activities, the following Quality
~
1 Assurance program improvements are being implemented.
- 1. ' A Corrective Action Reverification Program has been established. by Bechtel Jobsite QA. The purpose of this program is to reverify the' effectiveness of previous corrective actions taken for selected quality problems which:
- a. Were serious enough to have been reported to the NRC (DERs).
. b. Have. a history of recurrence
( t rends / audit / surveillance, CARS).
- c. May. be generic (Bechtel Power Civision's CIDS computer program).
2:. The Field QA Surveillance Program has been upgraded to include a selective sampling of QC-accepted installations on a monthly basis to continually assess effectiveness of the inspection program in vital areas of : pipe supports.
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