ML040440473
| ML040440473 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 11/04/2002 |
| From: | Gray B, Robert Lewis Entergy Operations |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| 32-5021539-00, 51-5012728-03 86-E-0074-160, Rev 0, 86-E-0074-161, Rev 0 | |
| Download: ML040440473 (10) | |
Text
ENCLOSURE 3 CNRO-2002-00054 ANO CALCULATIONS 86-E-0074-160 & 86-E-0074-161 (FRAMATOME DOCUMENTS 51-5012728-03 & 32-5021539-00)
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^.o~~~~~~~~~~~~~~~ _ ar D. 91 ARKANSAS NUICLIAR Ujml P'ane E-DOC NO. CHANGE NO.
' . ; CALCULATION SUBMITTAL SHEET I 5010.01-ATT-5 002-00-0 This Document Contains I Page(s)
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CALCULATION SUBMITTAL SHEET TO: ADMINISTRATIVE SERVICES DATE: 111412002 FROM: Ryan Linebarger CALCULATION NO.: 86-E-0074-160 ~ I` ' '
REV. NO.: 0
[The purpose of this submittal Is to Identify the status of the I ralculation as of this date. . I STATUS: A Remarks: Thanks!
Status Codes P (Pending) - Not Currently Installed, awaiting a Technical Specification change or design change Implementation A - (Active) - Qualified Existing Installed Condition H (Historical) - Historical Record, not replaced with a revised or new calculation and can be used as a reference.
Provide remarks if classification of the calculation Into one of these status codes needs further clarification. Also, for status of P provide remarks that Identify when calculation status is expected to change (I.e. what actions are planned-design change package number, Condition Report and Action item number etc.). It should be understood that any schedule information provided will be preliminary.
cc: Calc File
ARKANSAS NUCLEAR ONE Pao I E-DOCTITLE;: E4DOC NO. CHANGE NO.
CALCULATION COVER AND REVISION SHEET 5010.01 5-ATT-2 002.00 ARKANSAS NUCLEAR ONE
-CALCULATION COVER SHEET CsIc. No.: 8-0074-160 Rev. No.: 0 Cabc.
Title:
B&WIFTI UWeld Anomaly - Unit: I Category Q Considerutlons In the B&W CRDM DTemper System(s): RCS Bead Weld Repair" Cale. Type: BW Components: Topic(s): STRU Comp Tag Sufft Comp Code Pit Area: Bldg. 1RB EIev. 37' R-1 Vessel Room - Wall
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Config.Checidlt(por501D.04)coneted? YE No Document Commnnt/Resolution Fonn completed? Y D N Q I
Abstract (Included Purposo/Results):
This document provides th e description and the assumptions associated with the presumed existence of a weld anomaly Inthe CRDM nozzle IDTemper Bead Weld Repair.
Pages Revised and/or Added:
AD new 1-3 Purpose of Revision:
Initial Issue Intliating Document Resulting Document Key Design Input Document ER-ANO-2001 0230-020 Framatome Calc: 51-5012728-03 Verification Method: Design Review X Altsmate Calculation Qualification Testing Amends Calc(s): None Supersedes Calc(s) I CRN (a): None Computer Software Used: None - _,d Preparer. Fri I J lOl4/01 Reviewer: 4~n Gray )b7 63C&- 11/9/02%
Vendor Raviewr:
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Chock If Additional Revisions: Q
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20440-8 (1/2001) 1'R~t^ATOM£ ANP ENGINEERING INFORMATION RECORD Document Idntfier 51- 5012728-03 Tite Weld Anomaly Consdeations In the CRDM ID Temper Bead Weld Repair PREPARED BY: REVIEWED BY:
Name J.R. Dorman, Jr. Name H. W. Behnke Signabure Date 10128101 Signature _ Date 10M201 Technical Manager Statemen: Initials Review Is Independent Remarks:
This document provides a description and the assumptions associated with the presumed existence of a weld anomaly In the CRDM nozzle D Temper Bead Weld Repair. The description and assumptions will be considered for service suitability in a separate F-ANP calculation package.
Initial Issue Revision 1 - Mnor editorial changes. Additional descriptlon of anomaly Including void considerabons.
Revision 2- Editorial revisions to delete direct reference to associated calculation packages. This document was an Input to the packae and not associated with the calculation results.
Revision 3- Removed B&W from tte and text since the EIR Ispertinent to alJ FRA.ANP IDtemper bead repairs performed on CRDMs.
Document 88E-0074-160 Page of 3 Number RevO Page _ 1OF 3 _
- Document -E-0074 - 8D Number R 0.
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515012728-3 Page 2 of 3 An arMact of the 360-degree temper bead weld repairs of Control Rod Drive Mechanism nozzles Is an anomaly In the weld at the triple point The triple point is the juncture of Fte low alloy head, the alloy 600 nozzle and possibly a previously applied alloy 52 weld bead. The previous weld bead possibility arises from the variation in depth of the machined bore. The first weld layer Is on the low alloy steel bore and may not actually weld on the triple point. The second layer would then be the te-in at the triple point. Due to a combination of factors, this area of the weld has crack-like indications that could be 360 degrees around the nozzle. The crack-like Indication extends from the existing crevice Into the weld at angles from 0 to 90 degrees, where 90 degrees Is In the through-thickness direction of the nozzle and zero degrees is along the low alloy fusion line. Mock-up testing has verified that the anomalies are common and do not exceed .1 Inch In length. The typical length Is closer to .05 Inches. The anomaly may consist of a void with a crack-like indication extending from the void. The combined Indication Is still less than .1 Inch. The void Is principally a lack of fusion to the low alloy steel at the triple point. The anomaly Is a crack-like Indication extending Into the weld and Is not a lack of fusion to the nozzle wall. It Is assumed for conservatism that a .1 Inch Indication could exist In the through-thickness direction of the nozzle. Indications of this conservatively large size have not been observed. Due to its crack-like configuration, this ndication is analytically treated as a flaw.
The Section III analysis Is not affected and consideration of the flaw is made In the flaw evaluation.
An evaluation will be prepared to Justify the as-left condition including te indications up to .1 Inch. The evaluation also Includes a hypothetical planar flaw normal to the circumferential stress. This flaw will be assumed to be a 24o-I elliptical flaw with the minor axis equal to .1 Inch. This type of flaw Is not expected but is Included for completeness since the circumferential stresses are the largest stresses present In the weld area. This evaluation will be prepared In accordance with ASME Section XI and will demonstrate that for the intended service life of the repair, the fatigue crack growth is acceptable and the crack-ike indications remain stable. These two findings will satisfy the Section Xl criteria but will not Include considerations of stress corrosion cracking such as primary water stress corrosion cracking (PWSCC) or residual stresses.
Since the crack-ike defects are not exposed to the primary coolant and the air environment Is benign for the materials at the triple point, the time-dependent crack growth rates from PWSCC are not applicable regardless of residual stresses.
Residual stresses may also require consideration for ductile tearing when operating stresses are superimposed. The residual stress field by itself cannot promote ductile tearing or It would not be stable during welding. The anomalies have been shown to be stable by welding mock-ups simulating the actual geometry and materials. Even though the residual stresses for this type of weld would be very complex, it Is apparent that by the size of the weld and the nature of the restraint that the residual stresses would have limited effect on driving a crack. The weld residual stresses are not like piping thermal expansion stresses where there may be considerable stored energy In long runs of pipe. The weld residual stresses are Imposed by the Inability of the weld bead to shrink to a nominal strain condition upon cooling. The attachment of the weld to the surrounding material generally pmmotes tensile stresses In the bead upon cooling. However even though the stresses are
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51-501Z728-03 PaVo 3 of 3 generally at the yield strength, the accompanying strains are not large due to the limited size of the beads and in this case the total size of the weld.
It is concluded that the residual stress field will produce minimal ductile tearing The NiCrFe materials are extremely crack-tolerant when not in an aggressive environment and the ASME Section Xi evaluation performed for fatigue growth and net section failure will be adequate. Residual stresses need not be considered because PWSCC effects are not applicable, and the geometry Is not conducive to sustained ductile tearing.
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I-ENCLOSURE 4 CNRO-2002-00054 AFFIDAVIT FOR WITHHOLDING INFORMATION FROM PUBLIC DISCLOSURE
I AFFIDAVIT COMMONWEALTH OF VIRGINIA )
) ss.
CITY OF LYNCHBURG )
- 1. My name is James F. Mallay. I am Director, Regulatory Affairs, for Framatome ANP ("FRA-ANP"), and as such I am authorized to execute this Affidavit
- 2. I am familiar with the criteria applied by FRA-ANP to determine whether certain FRA-ANP information Is proprietary. I am familiar with the policies established by FRA-ANP to ensure the proper application of these criteria.
- 3. I am familiar with the Information contained in two attachments to a letter from Entergy Operations to the NRC (Letter No CNRO-2002-00054). These two attachments are calculation summary sheets (designated 32-5021538 and 32-5021539) that address the flaw evaluation of certain CRDM nozzle welds and are referred to herein as wDocuments." Information contained in these Documents has been classified by FRA-ANP as proprietary in accordance with the policies established by FRA-ANP for the control and protection of proprietary and confidential information.
- 4. These Documents contain information of a proprietary and confidential nature and is of the type customarily held in confidence by FRA-ANP and not made available to the public. Based on my experience, I am aware that other companies regard information of the kind contained in these Documents as proprietary and confidential.
- 5. These Documents have been made available to the U.S. Nuclear Regulatory Commission in confidence with the request that the information contained Inthe Documents be withheld from public disclosure.
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- 6. The following criteria are customarily applied by FRA-ANP to determine whether information should be classified as proprietary:
(a) The nformation reveals details of FRA-ANP's research and development plans and programs or their results.
(b) Use of the information by a competitor would permit the competitor to significantly reduce Its expenditures, In time or resources, to design, produce, or market a similar product or service.
(c) The information includes test data or analytical techniques concerning a process, methodology, or component. the application of which results in a competitive advantage for FRA-ANP.
(d) The information reveals certain distinguishing aspects of a process, methodology, or component, the exclusive use of which provides a competitive advantage for FRA-ANP in product optimization or marketability.
(e) The information is vital to a competitive advantage held by FRA-ANP, would be helpful to competitors to FRA-ANP, and would likely cause substantial harm to the competitive position of FRA-ANP.
- 7. In accordance with FRA-ANP's policies governing the protection and control of information, proprietary Information contained in these Documents have been made available, on a limited basis, to others outside FRA-ANP only as required and under suitable agreement providing for nondisclosure and limited use of the nformation.
- 8. FRA-ANP policy requires that proprietary information be kept In a secured file or area and distributed on a need-to-know basis.
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- 9. The foregoing statements are true and correct to the best of my knowledge, information, and belief.
4' SUBSCRIBED before me this
-7 day of crJ . 2002.
Danita R.Kidd NOTARY PUBLIC, STATE OF VIRGINIA MY COMMISSION EXPIRES: 12131104