ML20203M931
| ML20203M931 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 09/03/1986 |
| From: | Bateman R, Lynskey R, Rose J TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20203M897 | List: |
| References | |
| WP-11-SQN, WP-11-SQN-R01, WP-11-SQN-R1, NUDOCS 8609050185 | |
| Download: ML20203M931 (5) | |
Text
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r WELDING PROJECT l' GENERIC EMPLOYEE CONCERN a EVALUATION REPORT REPORT NUMBER: WP-11-SON R1
^ ~
DATE 08-26-86
SUBJECT:
SURFACE GRINDING OF WELDS CONCERNS CONSIDERED: IN-85-282-002 IN-85-271-001 PREPARED BY . . [k) I 25 & I
, OC, WP
([' #' REVIEWED BY .b. cma > YN84p , OC, WP REVIEWED BY s
. ML d!1f
' /
85 , QA, WP REVIEWED B -
/SM , CEG-H, WELDING r.Q //
/ '/ , PROGRAM MANAGER APPROVED BY (/
\ J c l
Revision 1 expanded the discussion on the removal of non-relevant indications and surface conditioning to incorporate the Senior Review Panel comments on 8/19/86. (: 00300
i
, GENERIC EMPLOYEE CONCERN
SUMMARY
SHEET Report Number: WP-11-SON R1 Report
Title:
SURFACE GRINDING OF WELDS I. CONCERNS CONSIDERED: IN-85-282-00 IN-85-271-001 II. ISSUE INVOLVED
- 1. Grinding of weld (surfaces) may mask surface defects.
III. STATEMENT OF CONCERN / ISSUE VALIDITY Validity: Y ,N X , Substantiated: Y ,N I . IV. EFFECT ON HARDWARE AND/OR PROGRAM None V. JUSTIFICATION b' Grinding is an acceptable method of surface conditioning for welds. VI. RECONMENDATION AND/OR CORRECTIVE ACTION NEEDED None VII. REINSPECTION NEEdr.D: Y ,N X . VIII. ISSUE CLOSURE By this report. , IX. ATTACHMENT i 1. Text of The Employee Concerns Page 1 of 1 ( 00300
. i +
GENERIC EMPLOYEE CONCERN r.- ( Report Number: WP-11-SON R1 s Report
Title:
SURFACE GRINDING OF WELDS I. SCOPE OF EVALUATION This engineering analysis covers the following WBN concerns determined to'have possible generic implications to SQN: IN-85-282-002 ' IN-85-271-001 II. ISSUES ADDRESSED BY THE CONCERNS The concerns were analyzed to determine the issue voiced by the concerned individuals. This issue is as follows: , Grinding of welds may mask surface defects. III. CONCERN VALIDITY OR SUBSTANTIATION The ASME B&PV Code, AWS, and ANSI Codes which govern the installation of welded features of nuclear plants contain provisions for weld
,,,, repair. These codes and standards were reviewed to determine if I"' grinding of welds is acceptable.
The AWS D.1.1 Structural Welding Code, Section III, Subsection NB, ASME B&PV Code, and ANSI B31.7, " Nuclear Power Piping," were reviewed. In all cases, grinding or mechanical means (a term which . implies grinding) are specifically referenced as acceptable methods for defect removal. ASME Section V, " Nondestructive Examination," also mandates the use of conditioning methods ( a. term which implies grinding) as a preparatory step for radiographic aad ultrasonic inspection. Additionally, Section V directly specifies grinding as an acceptable surfacs preparatory step for magnetic particle and liquid penetrant inspection. Surface conditioning and/or cosmetic grinding is frequently performed l so subsequent NDE inspections will be simpler and make subsequent ' l evaluations easier to interpret. For surface indications that are of l a minor nature, it is more expedient to perform cosmetic grinding or lR1 surface conditioning to remove the indications than to perform l evaluations to determine if the indications are non relevant. l In summary, the issue considered in this concern is not substantiated due to the fact that grinding is an acceptable practice. This issue is closed based on this report. (" Page 1 of 1 00300
Attrchment 1 CONCERNS) Page 1 of 1 CEMPLOYEE "jd4/02/SS PROBLEM l
- 17:31:27 -QTC- PPP CFR INSP TC ------CONCERN-------
ID STATUS RESP --' ---- -- i". LOC---- -- --- ---- ----- IN-85-282-OO2 WCMCU l SR ERT
- (f '
X: W Y: C 2: N - l'
's_7WORDS: INSPECTION PROGRAM CRITERIA SUR PR UNTIL RECENTLY, TVA WELD INSPECTORS REQUIRED ALL PIPE WELDS TO BE SU GROUND TO A SMOOTH FINISH. THE CONCERN IS THAT SMOOT t' MASK A SURFACE DEFECT WHICH WOULD OTHERWISE BE DETE -
WERE AVAILABLE. TECHNICAL COMMENTARY: 5 ISSUE CONSIDERED: SURFACE GRINDING OF WELDS. TC ------CONCERN------- PROBLEM RESP -QTC- PPP CFR INSP ID LOC STATUS --- --- ---- -- SR IN-85-271-001 WCDPW ERT XO X: W Y: C 'Z: N XEYWORDS: INSPECTION PROGRAM CRITERIA SUR PR WELDS BEING GROUND DOWN THROUGHOUT UNIT II TO SATISFY PRIMARY CONCERN AT THE PRESENT TIME IS FOR THE WELDS T SPECIFIC LOCATION GIVEN.
-- TECHNICAL COMMENTARY:
I ISSUE CONSIDERED:. SURFACE GRINDING OF WELDS.
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