ML20212J590
| ML20212J590 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 01/14/1987 |
| From: | Jordan A, Russell J, Violette J TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20212J485 | List: |
| References | |
| 222.6(B), 222.6(B)-R01, 222.6(B)-R1, NUDOCS 8701280244 | |
| Download: ML20212J590 (10) | |
Text
.
TVA EMPLOYEE CONCERNS REPORT NUMBER: 222.6(B)
SPECIAL PROGRAM REPORT TYPE:
SEQUOYAH ELEMENT REVISION NUMBER:
1
'~
TITLE:
PIPE SUPPORT WELD DESIGN AISC Minimum Weld Criteria PAGE 1 0F 9 REASON FOR REVISION:
1.
To incorporate comments by SRP, TAS, and TVA; to include TVA's corrective action plan information (see Section 10); and to comply with current format.
PREPARATION PREPARED BY:
wc1./ @
a-u-as
/ M GNATURE DATE REVIEWS REV EW COMMITT hV1/v
/2 - 2f'04
'~ MIGNATURE DATE
'~
f 4
/-lI~69 j'foi i/o/87 SIGNATURE DATE CONCURRENCES
^
"'O l
Y B7hD h h o]jgjj27 o
CEG-H:
dN k'6-17 PDR SRP: k w N. 73 sad [
N 'l ~ 87 SIGNATURE DATE SIGNATURE
- DATE APPROVED BY:.-y MI2/64]n
/-/?'-Tj uin ECSP MANAG8A DATE MANAGER OF NUCLEAR POWER DATE
- SRP Secretary's signature denotes
> concurrences are in files.
TVA EMPLOYEE CONCERNS REPORT _ NUMBER: 222.6(B)
SPECIAL PROGRAM REVISION NUMBER:
1 j
PAGE 2 0F 9 1.
CHARACTERIZATION OF ISSUE (S):
Concern:
Issue:
IN-85-109-003 American Institute of Steel "AISC Minimum Weld Criteria is Construction (AISC) minimum weld violated by Memo E440ll-01.
criteria were not always followed.
l Names are known."
2.
HAVE ISSUE (S) BEEN IDENTIFIED IN ANOTHER SYSTEMATIC ANALYSIS? YES X NO Identified by Watts Bar Nuclear i tant (WBNP)
[
Date 12/01/81 Documentation Identifiers:
Nonconformance Report (NCR) No. WBNYCP 8101/R1 (SWP 81 1201003) l
~
3.
DOCUMENT NOS., TAG NOS., LOCATIONS OR OTHER SPECIFIC DESCRIPTIVE IDENTIFICATIONS STATED IN ELEMENT.
Specific memo E44011-01 cited in the concern is the memo from J. A.
Raulston to J. L. Standifer,
Subject:
" Clarification of Welding Requirements," (App. A, 5.e).
4.
INTERVIEW FILES REVIEWED:
Review of interview files for concern IN-85-109-003 s hows t he following information:
Employee concern assignment request (K-form) o o
Form "D" o
Form "GA" 5.
DOCUMENTS REVIfWED RELATED TO THE ELEMENT:
See Appendix A.
6.
WHAT REGULATIONS, LICENSING COMMITMENTS, DESIGN REQUIREMENTS OR OTHER APPLY OR CONTROL IN THIS AREA?
See Appendix A.
0972d (12/24/86)
TVA EMPLOYEE CONCERNS REPORT NUMBER: 222.6 (B)
SPECIAL PROGRAM REVISION NUMBER:
1
.(
PAGE 3 0F 9 7.
LIST REQUESTS FOR INFORMATION, MEETINGS, TELEPHONE CALLS, AND OTHER DISCUSSIONS RELATED TO ELEMENT.
See Appendix A.'
8.
EVALUATION PROCESS:
a.
Reviewed Sequoyah (SQN) Pipe Support Design Criteria and l
Licensing Commitments regarding AISC minimum weld requirements.
I b.
Reviewed applicable codes.
c.
Reviewed pipe supports and calculations to ascertain if the l
code requirements and commitments are met.
9.
DISCUSSION, FINDINGS AND CONCLUSIONS Chronology:
Early 1940s: The minimum weld consideration was developed by American Welding Society (AWS) to minimize the possibility of underbead cracking.
Early 1970s: American Society of Mechanical Engineers (ASME) code recognized the need for minimum weld size.
12/01/81:
NCR No. WBNYCP 8101/R1 issued by WBNP 04/22/83:
SQN Pipe Support Design Manual, Section 7.15 for AISC minimum fillet weld requirements issued 01/20/84:
Memorandum from J. A. Raulston to J. C. Standifer,
Subject:
Clarification of Welding Requirements 02/14/85:
AStiE code case N-413 for minimum size of fillet welds issued 05/15/85:
TVA receives the employee concern Early 1986:
TVA Welaing Project Review Plan issued k.
0972d (12/24/86) 1
~
.TVA EMPLOYEE CONCERNS REPOP,T NUMBER: 222.6 (B)
~ SPECIAL PROGRAM REVISION NUMBER:
1 PAGE 4 0F 9 Discussion:
The CI has indicated that AISC minimum weld criteria are violated.
I SQN through its Pipe Support Design Manual, Section 7.15, paragraph 7.15.3 and FSAR paragraph 3.8.4.5.2 is committed to meet-AISC requirements for minimum weld size based'on the thickness of the parts being-joined.
AISC references AWS D1.1 as the welding code to be used for structural welding. Minimum weld sizes shown in Table 2.7 of AWS Dl.1 apply when prequalified welding is performed. This provision is intended to ensure sufficient heat input to reduce the possibility of cracking. The fillet weld sizes are related to the welding heat input and the base material's ability to dissipate heat. This minimum weld consideration.was developed in the early 1940s basically to minimize the possibility of underbead cracking.
However, the use of low hydrogen electrodes, now common-in the industry, minimizes the possibility of underbead cracking and therefore does not require adherence to the minimum weld size requirements.-
2 The ASME code similarly recognized the need for a minimum weld size in the early 1970s.
It adopted a minimum weld size requirement which was based on the AWS requirements.
Because of lack of relevance between this historical weld size requirement and the current technical requirements, ASME issued code case N-413.
The ASME code case N-413 " minimum size of fillet welds for subsection NF linear type supports" also permits fillet and partial penetration weld sizes smaller than the sizes listed in Section l
III, Division I, Subsection NF, provided that the allowable limits of Table NF-3324.5(a)(1) are met and weld size is specified on the
. design drawings.
TVA has performed qualification tests (App. A, 5.e) to the requirements of AWS Dl.1 code, which serve to qualify the use of fillet weld smaller than the minimum size. TVA has also verified through the Welding Project Review Plan ( App. A, 5.k) that the actual welding and welding inspection were accomplished by controlled procedures and proper documentation.
On the basis of the qualification tests, welding program observations, and in accordance with code case N-413, fillet welds of any size capable of carrying calculated loads may be used for joining materials listed in group 1, Table 4.1.1 of AWS Dl.1 code.
i 0972d (12/24/86) w
TVA EMPLOYEE CONCERNS REPORT NUMBER: 222.6(B)
- s SPECIAL PROGRAM REVISION NUMBER:
1 PAGE 5 0F 9 To independently ascertain if SQN did violate the AISC minimum weld I
requirements, 34 pipe supports (listed in App. A, 5.d) selected from the following systems were reviewed:
o Main steam o
Fuel pool cleaning o
Safety injection o
Condensate o
Upper head injection o
Blow down o
Chemical volume control Twelve supports (listed with asterisk "*" in App. A, 5.d) do not meet minimum weld requirements.
This indicates that SQN did, in some cases, violate AISC/FSAR commitment for minimum weld ~
requirements.
However, ASME code case N-413 as discussed above permits weld size smaller than AISC minimum weld provided design load and allowable stress limits are properly considered in the weld design.
To verify the above requirement, calculations for 4 out of 12 pipe supports were selected. The review team was unable to obtain these calculations as they were not available in SQN records.
An analytical verification for the supports identified with an asterisk in App. A, 5.d. should demonstrate compliance to ASME code case N-413.
On the basis of the results of the qualification tests performed by TVA, the evaluation team is of the opinion that the weld sizes smaller than AISC minimum weld size would be of adequate strength. Therefore, this verification can be completed post startup of SON.
The conflict between the practice.and the procedural / licensing commitment of adherence to AISC minimum weld requirement can be resolved with revision to the subject commitments.
Findings:
a.
SQN did not, in all cases, meet the AISC minimum weld requirements as committed to the design criteria and FSAR.
b.
Pipe support calculations were not available for review to determine if ASME code case N-413 can be applied.
l l
l l
0972d (12/24/86) 1
TVA EMPLOYEE CONCERNS REPORT NUMBER: 222.6(B)
SPECIAL PROGRAM REVISION NUMBER:
1
(
PAGE 6 0F 9
==
Conclusion:==
The concern is valid as SQN did not, in all cases, meet the AISC minimum weld requirements.
However, ASME code case N-413 permits weld size smaller than the minimum size required per AISC provided appropriate design loads and_ allowable stresses are considered in the weld design.
10.
CORRECTIVE ACTION:
In its corrective action plan (CAP) (App. A, 5.1), TVA commits to revise applicable FSAR sections and design criteria, and perform analytical verification of twelve supports whose welds do not meet minimum sizes. The evaluation team concurs with the CAP.
d
+
' [
0972d (12/24/86)
.TVA. EMPLOYEE CONCERNS REPORT NUMBER:
222.6(B)
SPECIAL-PROGRAM REVISION NUMBER:
1 PAGE 7 0F 9 APPENDIX A 5.
DOCUMEN1S REVIEWED RELATED TO THE ELEMENT:
a.
General Construction Specification, G-29C, Rev. 7, (12/21/81) b.
SQN FSAR Section 3.8.4.5.2, Paragraph 1, Rev. 2; Section 3.8-29, Paragraph 4, Rev. 2; and Section 3.5-54, Paragraph 5, Rev. 2 c.
SQN Pipe-Support Design Manual (PSDM), Section 7-15, Rev. O, (04/22/83) d.
SQN Pipe Support Drawings 1-MSH-77(H1-17)/R2 2-CCH-372(2-H10-372)/R2 4
1-MSH-130(H1-77,78)/R1 2-CCH-374(2-H10-374)/R1 1-MSH-165(H1-120)/R4 1-CSH-44(1-H21-44)/R904 1-MSH-300(1-H1-300)/R905 2-CSH-14(2-H21-14)/R906 1-MSH-301(1-H1-301)/R906
- 2-CSH-15(2-H21-i5)/R905
- l-MSH-357(1-H1-357)/R905 1-FPCH-505(H50-505)/R901
('
l-MSH-503(H1-503)/R4 1-FPCH-527(H50-527)/R2 1-AFDH270A(H3-280A)/R5
- 1-RCH-134(1-H36-134)/R905 1-AFDH-369(H3424)/R906
- l-RCH-136(1-H36-136)/R4 l-F0H-45(H4-43)/R1
. l-RCH-138(1-H36-138)/R1 1-FDH-201(1-H4-201)/R1
- 2-RCH-242(2-H36-242)/R903 2-UHIH-144(2-H45-144)/R02 1-SIH-365(1-SIH-365)/R2
- 2-UHIH-145(2-H45-145)/R905 1-CH-78(H6-78)/R2
- 2-SGBH-70(2-H47-70)/R1 2-CVCH-614(2-H34-614)/R904
- 2-SGBH-72(2-H47-72)/R1
- 2-CVCH-615(2-H34-615)/R4 2-H10-352(2-H10-352)/R1 2-CVCH-806(2-H34-806)/R902
- 2-CCH-367(2-H10-367)/R1
- 2-CVCH-813(2-H34-813)/R0 Pipe support drawings with an asterisk do not meet AISC minimum weld criteria.
e.
Memorandum from J. A. Raulston to J. C. Standifer,
Subject:
Clarification of Welding Requirements, (01/20/84)
(NEB 840120 275)
I
.f.
American Institute of Steel Construction Manual, 7th Edition 9
Structural Welding Code - Steel, AWS D1.1, (1984) h.
Final Report of Nuclear Performance Plan (NPP), Volume II, Rev.1, (07/14/86) k 0972d (12/24/86)
TVA EMPLOYEE CONCERNS REPORT NUMBER: 222.6(B)
SPECIAL PROGRAM REVISION NUMBER:
1 f
PAGE 8 0F 9 APPENDIX A (cont'd) 1.
EN DES-EPl.14,~
Title:
" Engineering Records - Retention and Storage," Rev. 10,(05/13/83) k.
TVA Welding Project Review Plan 1.
TCAB-005(11/07/86) and TCAB-042 (12/24/86), corrective action plans (CAPS) for Element 222.6(B) 4 6.
WHAT REGULATIONS, LICENSING COMMITMENTS, DESIGN REQUIREMENTS OR OTHER APPLY OR CONTROL IN THIS AREA?
a.
SQN FSAR Section 3.8.4.5.2, paragraph 1, Rev. 2; Section 3.8-39, paragraph 4, Rev. 2; and Section 3.8-54, paragraph 5, Rev. 2 b.
SQN Design Criteria SQN-DC-V-24.1, Rev. O, (consolidation of pipe support design criteria), (06/23/86) c.
SQN Pipe Support Design Manual, Section 7.15, Rev. O, (04/22/83) 7.
LIST REQUESTS FOR INFORMATION, MEETINGS, TELEPHONE CALLS, AND OTHER DISCUSSIONS RELATED TO ELEMENT.
a.
RFI #SQN-515, (08/24/86) r b.
RFI #SQN-607, (10/02/86) c.
TVA Transmittal No. 102,(08/29/86) 0972d (12/24/86)
TVA EMPLOYEE CONCERNS REPORT NUMBER: 222.6(B)
.t:
SPECIAL PROGRAM REVISION NUMBER:- 1
(
PAGE 9 0F 9 CATD LIST The following CATDs identify and provide corrective action for the findings included in this report:
222 06 SQN 01 (11/20/86) 222 06 SQN 02 (11/04/86) y l
l i
i 0972d(12/24/86) l-
f' z;.
a ni 4;
~)
REFERENCE ECPSI20J-ECPS121C TENNESSEE VALLEY AUTHORITY PAGE 105 FREQUENCY
- REQUEST OFFICE OF NUCLEAR POWER RUN TIME - 12:57:19 ONP - ISSS - Rl!M EMPLOYEE CONCERN PROGRAM SYSTEM (ECPS)
RUN DATE - 12/02/86 LIST OF EMPLOYEE CONCERN INFORMATION CATEGORY: EN DES PROCESS & OUTPUT SUCCATEGORY: 22206 AISC MINIMUM HELD CRITERIA I
S GENERIC KEYHORD A H
APPL QTC/NSRS P
KEYWORD B CONCERN SUB R PLT BBSH INVESTIGATION S
CONCERN KEYWORD C HUMBER CAT CAT D LOC FLQB REPORT R
DESCRIPTION KEYHORD D 3
IN 109-003 EN 22206 N HBN YYYY SR AISC MINIMUM HELD CRITERIA IS VIOLAT HELDING 150082 REPORT ED BY MEMO E44011-01. NAMES ARE KND NONCONFORMANCE HN.
HELDING s'
HELDS.
1 CONCERNS FOR CATEGORY EN SUBCATEGORY 22206
)
)
.)
)
)
)
f
)
~
. _ - _