ML20039A165
| ML20039A165 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 12/04/1981 |
| From: | Woolever E DUQUESNE LIGHT CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 81-03, 81-3, NUDOCS 8112160295 | |
| Download: ML20039A165 (4) | |
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4 DEC 41981 (412) 456-6000 435 Sam Avenue 0",ya# "'
mm 4376 United States Nuclear Regulatory Commission
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OEgj g 1981 ATTENTION:
Mr. Boyce H. Grier, DJrector
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SUBJECT:
BEAVER VALLEY POWER STATION - UNIT NO. 2 Docket No. 50-412
,D Pipe Support
__am Attachment - Significant
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Deficiency Report 81-03 s
Gentlemen:
This Letter is Interim Report Number 1 concerning significant Deficiency 81-03.
On November 5,1981, a significant deficiency concerning the reduction of the load carrying capability of a beam attachment used in pipe support assemblies was reported to your Mr. Greenman.
The detailed evaluation of the pipe supports involved is in progress. A more thorough statement concerning this matter is attached.
A second interim report will be submitted on February 5,1982.
The date for the final report will be identified in the February 5 submittal.
DUQUESNE LIGHT COMPANY By 9
'/ E."J. Woolever Vice President Attachment cc:
Mr. V. Stello (15)
Director of Inspection and Enforcement Ms. Jane Grant Licensing Mr. G. Walton NRC Resident Inspector
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PDR ADOCK 05000412
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o Mr. Boyce H. Grier, Director Page December 3, 1981 WWF/mbj bec: R. J. Washabaugh H. A. VanWassen T.
D. Jones D. H. Williams E. J. Woolever A. J. Zelesnak J. J. Carey R. J. Swiderski l
H. P. Williams J. A. Werling F.
Salmon R. Coupland C. R. Bishop P.
RaySircar J. Pedro (NUS)
C. N. Dunn C.
E. Ewing J. E. Walsh BV-2 Licensing File (KAT)
References:
- 1) 2DLS-12848 of 12/1/81 " Welded Type Beam Attachments Potential De-ficiency"
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INTERIM REPORT OF WELDED TYPE BEAM ATTACHMENTS AT BEAVER VALLEY POWER STATION - UNIT NO. 2 1.0
SUMMARY
Power Piping Company (PPCO), BVPS-2 pipe support vendor, has supplied HS-142 welded type beam attachments for rigid sway strut sizes 25, 40, 50, 60 and 80 which when loaded at application angles other than vertical, have reduced load ratir.qs which were not originally indicated.
Approximately 800 rigid sway struts (pipe supports designated PSST or PSR) utilizing the HS-142 beam attaenment exist on BVPS-2.
j 2.0 IMMEDIATE ACTION TAKEN An investigation was begun to identify the pipe supports involved.
3.0 DEFICIENCY PPCO's original design calculations for the HS-142 beaqn attachment con-sidered the direction of loading in a vertical
(" Straight Down ")
orien-tation only. However, the beam attachments were used at various angles of application as permitted by the PPCO catalog data. PPCO has determined that the allowable beam attachment load rating at various angles may be less than the full rated loads indicated by the catalog and by the original calculations. PPCO has also determined that the weld between the baseplate and pin plates of the beam attachment is the cause of the possible deficiency.
This weld may fail when the beam _ attachment angle of application is other than vertical and the applied axial load on the strut assembly exceeds the derated load for the specific angle of application.
4.0 ANALYSIS OF SAFETY IMPLICATIONS Analysis of ' safety implications will be provided in the final report.
I 5.0 CORRECTIVE ACTION i
l PPCO has performed and furnished the results of an analysis to determine
_ reduced load ratings of HS-142 beam attachments. Results of this analysis are in the form of charts for each size of beam attachments used on BVPS-2.
The charts provide derated loads at various angles of application.
Load ratings are indicated for beam' attachments as -they exist and for beam-attachments w!th increased weld sizes.
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PPCO has also provided an initial evaluation of pipe supports identified as PSST's.
The initial evaluation covers 330 supports.
PPCO's evaluation of 330 PSST's reveals that, with one exception, design loads for these struts are lower than derated loads. One overloaded strut was redesigned for other reasons. This is currently being verified.
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Crsluation of the remaining 470 supports (identified as PSR's) is in prr4 ress.
,s In the event a support is found with design loads which exceed derated loads,-as furnished by PPCO, further action will be taken to correct the deficiency by either redesigning the support to eliminate the strut assembly or providing an adequately sized strut.
6.0 FINAL REPORT A second interim repor t will be submitted by February 5, 1982.
It is anticipated that the extent of reanalysis will be known at that time and that the required modifications will be identified. A date for submittal of the final report will be established at that time.
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