ML20024F544
| ML20024F544 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 07/20/1983 |
| From: | Woolever E DUQUESNE LIGHT CO. |
| To: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20024F536 | List: |
| References | |
| 2NRC-3-048, 2NRC-3-48, NUDOCS 8309090466 | |
| Download: ML20024F544 (3) | |
Text
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"/ap 2NRC-3-048 (412) 787-$141 Telecopy Nuclear Construction Div!sion Robinson Plaza, Building 2, Suite 210 July 20, 1983 Pittsburgh, PA 15205 United States Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406 ATTENTION:
Mr. Richard W. Starostecki Division of Project and Res ident Programs
SUBJECT:
Beaver Valley Power Station - Unit No. 2 Docket No. 50-412 USNRC IE Inspect ion Report No. 50-412/83-07 DLC Response Letter 2NRC-3-041, dated July 12, 1983 Gentlemen:
This letter provides additional information relative to our previous response to the subject Inspection Report.
The las t paragraph of our July 12 let ter has been divided into two paragraphs and is hereby ammended to read as follows:
Beaver Valley - 2 is reanalyzing the exh au s t piping ci t ed in the infraction. This system is not representative of ASME III piping systems, since it is in fact a low pr es sur e, high t empe ra ture duct system which carries the exhaust gasses away from the di es el ge nera to r and exh au s t s them to atmosphere.
ASME III piping sys t ems are typically more complex, higher pres sure closed sys tems, that involve various other component s s uch as valves, pumps, heat exch ange rs, etc.
Therefore, it would not be ap pr opri at e to fo rm any general conc lus io ns regarding the ef fect s of increased fitting thickness on piping stress analys is fr om the result s of the anal ys is of this exh au s t system.
In reviewing the exis t ing analys is of the system, it was obse rved that the inf lue nce of the di es el generator silencer nozzle stif fnes s has much more significance than the ef fect s of the th ic knes s of the elbows and t e es.
Alt hough it sho uld have be en rec ognized that this was an unusual piping sys tem and a better es timate of silencer nozzle stif fness should have been chosen, this af fect would have been di sc ove red during the reso lut ion of the int erf ace with the ve ndo r.
The influence of elbow and tee thic knes s on this design is not c le ar at this time but is s ign if ic ant l y le s s than - the influence of the silencer nozzle s t if fn es s.
The reanalysis is expect ed to be completed by August 5, 19 83, and would be available to the Resident Inspector upon request.
8309090466 830823 PDR ADOCK 05000412 G
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United Stctes Nuclear Regulatory Commission Mr. Richard W. Staros tecki Page 2 With respect to the generic influences of heavy wall fittings, we are reviewing the ef fect s of selected NRC benchmark piping problems (Reference 2) and will report on the progress in this regard by August 20, 1983.
We would like to discuss our approach to this benchmark review program with your pe rsonnel during the week of July 25, 1983.
DUQUESNE LIGHT COMPANY By E. J. Wooleve r Vice President JS/ajs cc:
Mr. G. Walton, NRC Resident Inspector Ms. L. Lazo, Proj ect Manage r NRC Document Control Desk REFERENCES :
1.
NRC letter Docket No. 50-412 dated June 10, 1983 2.
Piping Benchmark Problem, Dynamic Analysis, NUREG-CR/1677 and BNL-NUREG-51267, Vol. L 3.
2NRC-3-041, dated July 12, 1983 COMMONWEALTH OF PENNSYLVANIA )
)
SS:
COUN'IY OF ALLEGHENY
)
On this 20 d day of 2/s,
/
b, before me, a Not ary Pub lic in at[for s id Commonwealth and County, personally appeared E.
J.
Woolever, who being duly sworn, deposed and said that (1) he is Vice President of Duquesne Light, (2) he is duly aut ho ri zed to exe cut e and file the fo regoi ng S ubmi t t al on behalf of said Compa ny, and (3) the s tat ement s set fo rt h in the Submittal are true and correct to the best of his knowledge.
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N6t ary Public ELVA G. LESONDAK, NOTARY PUBLIC ROBINSON TOWNSHIP, ALLEGHENY COUNTY MY COMMISSION EXPIRES OCTOBER 20,1986
United States Nuclear Regulatory Commission Mr. Richard W. Starostecki Page 3 JS/wjs bec: P. RaySircar (3)
J. Sutton (S&W)
NCD File C. R. Bishop C. E. Ewing T. D. Jones R. J. Swiderski J. F. Zago rski H. M. Siegel MCE REFERENCES :
1.
2DLS-17896 2.
Piping Benchnark Problem, Dynamic Analysis, NUREG-CR/1677 and BNL-NUREG-51267, Vol.1 3.
2NRC-3-041, dated July 12, 1983 4.
NRC let ter Docket No. 50-412 dated June 10, 1983 3
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