ML20095E533
| ML20095E533 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 06/27/1984 |
| From: | Woolever E DUQUESNE LIGHT CO. |
| To: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 2NRC-4-092, 2NRC-4-92, NUDOCS 8408240275 | |
| Download: ML20095E533 (3) | |
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Telecopy (412) 787-2629 Nuclear Construchon Division June 27, 1984 Robinson Plaza.'Juilding 2, Suite 210 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 Resident Programs
SUBJECT:
Beaver Valley Power Station - Unit No. 2 Docket No. 50-412 USNRC IE Inspection Report No. 50-412/84-05 and Supplement II to 50-412/82-01 Violation 82-01-01 Gentlemen:
The purpose of this letter is to provide Beaver Valley Power Station Unit 2 (BVPS-2) response to the commitment identified by the NRC in NRC Inspection Report 50-412/84-05.
The following is BVPS-2's po s i-tion regarding the disposition of the 26 accessible and 177 inaccessible pipe-to-fitting welds as being acceptable in relation to NRC Violation 82-01-01.
On May 22, 1984, NRC, BVPS-2, and Stone & Webster Engineering Corporation (SWEC) representatives met to discuss NRC Violation 82 01.
Violation 82-01-01 is concerned with a notch condition on the surface of ASME III, Class 3 butt welds.
Earlier discussions on this matter resulted in ac ceptance criteria being added to speci fication 2BVS-920 (Field Fabrication and Erection of Piping) and Site Quality Control (SQC) reinspecting ASME III, Class 3 butt welds to the new specification criteria. As a result of the meeting of May 22, 1984, the NRC requested additional information in order to reach a final decision on the pipe-to-fitting welds.
The information requested by the NRC is as follows:
1.
Identify the systems and weld identification numbers for the 26 accessible welds and the 177 inaccessible welds.
2.
Identify the number of thermal cycles to which each of the welds will be subjected.
3.
Tabulate the calculated stress results (based on equations 9 and 10 of ASME III) at the location of each of the 26 acces-sible welds and compare this to the allowable stresses.
4.
Verify that the number of thermal cycles for each of the 177 inaccessible welds is "much less than" the 7,000 cycles of the fatigue curve.
8408240275 840627 PDR ADOCK 05000412 3
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Y Unit ~d St::t;; Nucirr R ictory Commionicn Mr. Richard W. Starostecki Page 2 5.
Clarify the second paragraph on page 2 (Reference 1) as requested by the NRC.
In response to Items 1, 2, 3, and 4 above, the Senior Resident NRC Inspector will be provided the information in table form by July 6, 1984. In addition to the 26 accessible pipe-to-fitting welds identified is," an additional 83 pipe-to-fitting welds on N6D-6599c as " accept as will be tabulated similar to the 26 pipe-to-fitting welds in the same manner.
These 83 welds are identified on N&D-7380 as "ac ces s ib le."
This information will also be made available to the Senior Resident NRC Inspector by August 30, 1984.
The clarification as requested by item 5 is provided:
"In support of this assessment, the existing ASME III, Class 3 criteria requires that stress intensi-fication factors (SIF) be applied to fittings but not to valves.
The SIF required by ASME III, ND/NC-3472, typically ranges between 1.3 and 4.5 for fittings adjacent to the welds in que s t ions,
thus requiring the maximum allowable moment loading to be reduced by the amount of the factor.
The reduced moment loadings, a low number of thermal cycles, and the low temperature and pressure appli-cations contribute to an overall cons e rva t ive design for the piping systems within which these welds exist. This conservative design suf ficiently offsets potential weld surface concerns expressed in Violation 82-01-01."
DUQUESNE LIGHT COMPANY By E.VJ. Woolever Vice President SDH/wjs cc: NRC Document Control Desk Mr. G. Walton, NRC Resident Inspector Mr. E. A. Licitra, Project Manager
REFERENCES:
(1) 2NRC-4-027, dated 3/14/84 (2) NRC Inspection Report 50-412/84-05, dated 6/8/84 SUBSCRIBED AND SW0y TO BEFORE ME THIS
////DAYOF (kub 1984.
2Eh 4aO lbt Notary Public ANITA ELAINE REITER, NOTARY PUBLIC ROBINSON TOWNSHIP, ALLEGHENY COUNTY MY COMMISSION EXPIRES OCTOBER 20,1986
Unitcd Stct02 Nuc1;cr R Ictcry Commicsion Mr. Richard W. Starostecki Page 3 COMMONWEALTH OF PENNSYLVANIA )
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COUNTY OF ALLEGHENY
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On this M M day of t'r,t./
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, before me, a Notary Public in and for sad 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 authorized to execute and file the foregoing Submittal on behalf of said Company, and (3) the statements set fo rth in the Submittal are true and correct to the best of his knowledge.
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Notary Public ANITA ELAINE REITER, NOTARY PUBLIC ROBINSON TOWNSHIP, ALLEGHENY COUNTY MY COMMISSION EXPIRES OCTOBER 20,1986 i
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