ML20010F185

Interim Potential Deficiency Rept Re Weld Cracks of Embed Plates at Site.Final Rept Will Be Submitted by 820120,after Evaluation of Effects of Bypassing post-weld Heat Treatment Are Completed

ML20010F185
Person / Time
Site:	Satsop
Issue date:	08/27/1981
From:	Leddick R WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Faulkenberry B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, GO3-81-2424, NUDOCS 8109090469
Download: ML20010F185 (4)

Text

50.55(e) Report

'Y* Docket Nos. 50-508/509

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Washington Public Power Supply System Box 1223 Elma, Washington 98541 (206)482 4428 August 27, 1981 G03-81-2424 Nuclear Regulatory Conrnission, Region V Suite 202, Walnut Creek Plaza ,e 1990 t' orth California Boulevard e- 4 Walnut Creek, California 94596 V

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Attention: Mr. 8. H. Faulkenberry C 6;JL i Chief, Reactor Ccrstruction Projects Branch 08 GW' $1 Gentler,an: '

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Subject:

Project NOS. 3 AND 5 00CKET NUMBERS 50-508 AND 50-509 Y'N ' ...

INTERIM REPORT OF POTENTIAL 50.55(e)

WELD CRACXS IN EMBED PLATES ,

Referenc6: 1) Letter, G03-81-2111, R. S. Leddick to B. H. Faulkenberry, dated June 12, 1981. "

, 2) Letter, G03-81-2159, R. S. Leddick to B. H. Faulkenberry, dated June 24, 1981.

Attached please find a copy of the Engineer's Interim Report of a potential 10CFR5').55(e) concerning weld cracks of embed plates at the WNP-3 and 5 Site.

The Engineer states in this interim report that the final report vill be submitted to the Supply System on January 1, 1982. We will nrovide the final report to the NRC by January 20, 1982.

Should you have any qu3stions or desire furthcr information please contact me directly Very truly yours, y

R. S. Leddick frogram Director, WNP-3/5 1 cc: J. Adams - PP&L G. S nithpeter - BPA ,

Ebasco - New York WNP-3/5 Files - Richland

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• Ir 0109090469 810827 n.3)

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{DRADOCK05000 31.91

P-WASHINGTON PUBLIC, POWER SUPPLY SYSTEM WPPSS NUCLEAR PROJECTS N0. 3 & 5 ENGINEERING INTERIM REPORT WELD CRACKS AT CORNER J07NTS OF SHEARLUGS TYPE RP PLATES AUGUST 20, 1981

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g c INTRODUCTION On April 9th,1981 Fought Steel detected some weld cracks at corner joints' of shearlugs on RP-28 embed plates at their fabrication shop in Portland, Oregon.

Cracks were found at corner joint where transverse and longitudinal shear-lugs meet. Although design does not have any requirement to weld these two plates togetner, the vendor provided a tiv.ll fillet weld at the joint where crackr were disccvered. The lug-to-plate weld is designed to be a double bevel ti.ll penetraticn weld. However, Fought Steel provided a double bevel partini penetration weld.

Since Fought provides different types of RP plates, if was necessary to in-vestigate whether this problem existed in other plates. An investigation was launched immediately. On April 10th, 1981, an NCR was generated to iden-tify the crack problem in RP-28 plates. NCRs were generated to identify and control RP-ty'e plates and weld types. May 12th, 1981, NRC was notified of the deficiencies in accordance with the provisions of 10CFR50.55(e).

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A. POTENTIAL PROBLEMS AND REFERENCE TO THE NOTIFICATION Potential problems have been identified in NCRs and the NRC had been notified of the deficiencies in accordance with the provisions of 10CFR50.55(e).

j The potential problems are discussed below:

Fought identified the problem at the shop during straightening the plate which warped due to welding shearlugs. Engineering investigation re-vealed that Fought had been following the cold-straightening procedure to currect any warpages which occurred due to welding, Fought continued the weld across the corner joint with a thin weld pass.

This created two problems:

1) possibility of crack just in vertical joint section of weld

2) possibility of crack propogating into the base metal Oue to these defects the plate would have been functionally insuffi-cient to support the loads. These plates were sent back to the fabr'-

cator.

B. APPROACH TO THE RESOLUTION OF THE PROBLEM There are one hundred and sixty-seven (167) plates of eleven (ll) RP types subject to investigation. Three (3) plates of the RP-29 type were ,

embedded in concrete, the rest were readily accessible for inspection. i An inspection plan was implemented to NDE the weld in all corners formed  !

by intet secting shearlugs and rework as directed by the Engineer if re- l quired. j

. .; , 4 l lC. STATUS OF PP0 POSED RESOLUTION L

All plates were inspected either by MT, PT or UT. Eight (8) RP-28 plates

'and two (2) RP-33 plates were found to have cracks. The remaining plates l did not have defects and were a~ccepted. To eliminate future problems, l all plates were reworked to remove the. corner weld. The three (3) em-bedded RP-29 plates showed no defects in UT examination. No other RP-29 plates had defects. On the. basis of these observations RP-29 plates l

were accepted.

D. REASON WHY THE FINAL REPORT WILL BE DELAYED

. In addition to the weld crack problem, a recent investigation revealed that the plates were not post weld heat treated as required by Specifi-cation 3240-448. Engineering requires additional time to evaluate the effects of bypassing post weld heat treatment. Upon ;orapletion of this l investigation a final report will be issued.

E. PROJECTED COMPLETION OF CORRECTIVE ACTION AND SUBMITTAL DATE OF COMPLETE REPORT l

l A comprehensive analysis and engineering evaluation of these plates will be completed by December,1981 and the final reptrt will be submitted to Supply System by January, 1982.

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