ML20004A414
| ML20004A414 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek, Callaway  |
| Issue date: | 05/11/1981 |
| From: | Petrick N STANDARDIZED NUCLEAR UNIT POWER PLANT SYSTEM |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| SLNRC-81-29, NUDOCS 8105150214 | |
| Download: ML20004A414 (6) | |
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,_._.4-SNUPPJ i
Standardised Nuciaer Unit Power Mont Sntem 5 Choke Chwry Road Nicholas A. Petrick mekvirls. Marytend 20e50 Exocutive Director (301) 7 8 8010 May 11, 1981
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SLhRC 81 29 fit.E : 0278.1 SUBJ: Request for Use of ASME Section III Code Case N-271 l
Mr. Harold R. Denton, Director Office'of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washingcon, D. C.
20555 L farences : STN 50-482, STN 50-483, STN 50-486
Dear Mr,
. Denton:
This letter is submitted on behalf of Kansas Gas and Electric Company, Kansas City Power & Light Company and Union Electric Company to request the concur-rence of the Nuclear Regulatory Commission to use the following ASME Secthn III Code Case on the referenced SNUPPS Projects:
Code Case H-275 Entitled " Repair of WeldsSection III Division 1" Altncugh not currently listed in Re5Jlatory Guides 1.84 and 1.85 as an applicable code case revision, the subject ruling has teen prepared and issued to provide clarification where the full thickness of the weld is removed and the back side of the weld joint assembly is not accessible for removal of examination materials.
IIRC concurrence is requested for SNUPPS use of Code Case N-275.
VeryNruly :4trs,
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~ Nicholas A. Petrick N
CWH/srz Attachments cc:
J. K. Bryan UE G. L. Koester KGE D. T. McPhee KCPL
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DANIEL CONSTRUCTION COMPANY j
CALLawAv PLANT
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March 9, 1981 DLUC - 6207 Required Response Date - 3/23/81 1
Union Electric Company P. O. Box 149 (Code 470)
St. Louis, M0 63166 ATTENTION:
W. H. Weber Manager, Nuclear Construction
SUBJECT:
REFERENCE:
ASME Section III NB/NC/ND/NE/NF/NG-4453.1
Dear Walt:
The subject Code Case provides clarification for examination of areas prepared for weld repair when the full thickness of the weld is removed and the back side of the weld joint assembly is not accessible for removal of examination materials.
It has not been Daniel's practice at the Callaway/ Wolf Creek Projects to PT/MT examine excavated creas of full penetration butt welds when the excavation is performed to remove defects detected by RT and the excavation removes the full thickness of the weld, thus re-establishing a root gap.
l ASME Section III addresses NDE requiremeilts for weld excavations prior to repair in ASME Section Ul, paragraph NB/NC/ND/NE/NF/NG-4453.1. The applicability of this requirement to welds that are excavated through the root was the subject of an inquiry made to ASME on September 8,1980. A copy of the inquiry is attached.
A formal response to the inquiry was not received; however, the DIC Corporate Manager of Technical Services did receive an explanation from i
F.1. Moschini, ASME Chairman - Subgroup on Fabrication and Examination (Sec. III), via telephone. Mr. Moschini stated that an ASME Code Case i
(N-275) now specifically addresses the requirement for NDE of the repair excavations in question.
It was Mr. Moschini's opinion that paragraph NB/NC/ND/NE/NF/NG-4453.1 was not initially intended to be applicable to excavations extending through the weld root and since there is now aJddenEL Case clearly estab'oishing the requirement pertaining to thes
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l a formal response to the aforementioned inquiry would not bel
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nto 'a-(y. 2% j Mr. Moschini indicated that Code Case N-275 would be incor l
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later addenda of the code.
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' Page 2-w, DUIC - E207 1
March 9,1981 4
.x Based on the above information, DIC requests Bechtel and Westinghouse i
i concurrence of the following action relative to repair excavations extending through the root of weld joint assemblies.
1.
Code Case N-275 should be adhered to on future repairs. Since the Code Case clearly establishes the rule for excavations through the root pass, DIC would begin to implement the Code CAM *. Ton Bechtel and Westinghouse approval.
2.
Code Case N-275 should be incorpe, rat.d into the applicable design specificatiory. This would clearly establish project rec.airements for repair excavations extending throegh the root pass.
3.
Repairs made pr ^vious ts this date have' been in
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conformance with Code Case N-275 with the excep-tion that excavations extending through the root of joints with the back side accessible for removal of examination ma.erials have not been examined by PT/MT. Previously completed and accepted repairs should be considered acceptable without an attempt to retrofit this part of the Code Case.
The following justification is provided for acceptance:
A.
The requirement to treat excavations of weld joints with accessible internal surfaces differently from i
joints with inaccessible internal surfaces does not become a requirement until completion of recommended action : tem No. 2 at,0ve.
It is nrt established by the present requirement of NB/NC/ND/NE/NF/NG-4453.1 that they be treated differently.
B.
Excavations and repairs with accessible interr.ai surfaces have been inspected, at minimum, to the same extent as repairs and excavations with in-accessible internal surfaces.
Concurrence of the Auu.orized Inspection Agency (HSBI & I Co.) Special Inspection Services Reg onal Representative has been obtained from DIC Corporate rianager, Tech. ical Services for Item No. 3 above.
By direct copy of this DLUC, we request Bechtel and Westinghouse to expedite their review and approval of the above items.
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DLUC'- 6207 March 9, 1981 l
l If you have any questions concernir.i the above, or additionti information is required, please advise, Very truly yours, m.. 3.-- - - - -
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H. J. Starr J
Project Manager HJS:
- 3[:pse Attachment CC:
W. L. Petrie J
J. H. Smith-i D. F. Schnell J. A. Holland S. fiartinez D. Schofield J. J. Long File. ( A11.56)
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ENCLOSURE NO. 2 8M. r/.
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CASE N-275 Q
CASES OF ASME D0ll'R AND PRESSURE VESSEL CODE hiteting of.11urch 7,1900 Approved by Council,.11ay I5, !900 i
This Case shall expire on.11ay 15,1983 unless previously annulled or reaffirmed.
snents of Nil /NC/ND/NF1NF/NG.4453.1 for Section !!!,
l Case N.275
- Repair of Welds Division I construction:
Sectior. til, Division 1 (1) Unacceptahic indica
- ions shall be removed by O
mechanied means or by thermal gou;:ing methods.
laguiry: What alternat.ive tules rney be used for the (2) The arca prepared for repair thd! be examined hv examination of the area prepared for repair of welds a the liquid penetrant or ma:nctic particle method in j
lieu of the requirements of NL/NC/ND/NT/NF/NG.
accordance with FB/NC/ND/NE/NF/NG.5110 and shall 4453.1 for Sretion !!!, D, won 1 construction where mect ec acceptance standardsof NB/NC/NDINE/NF/NG.
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the fall thickness of the wcld is removed and where the 5300 except that the examinatio i is not required where back side of the wcld joint assembly is not accessible for the full thickness of the weld is removed and s.here the remaval of e amination materials?
back side of the weld joint assembly is not accessible for Reply: It is the opinion of the Committer that the removal of examination materials, followin; rules for the examination of the area prepared (3) The completed wc!d repair shall be examined in accordance with ND/NC/ND/NE/NF/NG.4453.4.
for repair of welds may be used in lieu of the require.
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DANIEL CONSTRUCTION COMPANY oA m ri,suito wo GREENVILLC. SOUTH CAROLINA 20602 teose tes.asoo Sept. 8, 1980 ASME United Ent;ineering Center 345 East 47th Street New York, N. Y.
10017 Attention:
Mr. J. Millman Secretary Subcommittee on Nuclear Power
Dear Sir:
Your respense to the following inquiry is requested.
Do the examination requirements of ASME Section III paragraph NB-4453.1 apply when the excavation of a defect detected by RT of a full penetration circum-fer :ntial pipe butt weld made without backing results in the weld being re-me,.ed through its full thickness in the area of the defect thus reestablishing a root gap at this location? Other conditions applicable to the jnint in question are:
- 1) The inside surface of the weld, adjacent to the excavation is inaccessible.
- 2) The repaired arca will be extmined by RT.
A /
Y L. E.'Harttell Manager, Technical Services LEH/1s cc:
J. Roach g Clark j
L. Pardi f
J. Long O
P00R ORIG NAL J