ML20055D486
| ML20055D486 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 07/02/1990 |
| From: | Hairston W ALABAMA POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9007090008 | |
| Download: ML20055D486 (3) | |
Text
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' Alabama Power Company 40 inverness C:nt:t Parkway.
Post Office Box 1295 Birmingham. Alabama 35201 Telephone 205 868-5581 W. G. Hairston, lil Senior Vice President uiear operanons Alabama Power July 2, 1990-msmern ercsnrern 10CFR50.55a i
-Docket Nos. 50-348
=i 50-364 l
U.S. Nuclear Regulatory Commission
.l i
ATTN:
Document Control Desk Washington, D.C.
20555 Gentlement Joseph M. Farley Nuclear. Plant ASME Code Case N-395, Laser Velding 1
Alabama Power Company is currently developing contingency plans for. steam generator maintenance for Farley Unit 2.. The Unit--2 refueling outage is.
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scheduled to start in mid-October:1990.
Dependent on the steam generator tube eddy current testing results, tube sleeving may be required.
As presented at a meeting with the NRC Staff oniJune 7, 1990,.Vestinghouse is developing a laser velded steam generator tube sleeve for'use in the Fall' j
of 1990.
ASME Boiler and Pressure Vessel Code Case N-395, Laser Velding (attached),
l has not been' authorized for use by;the.NRC-Staff in accordance with L
10CFR50.55a, footnote 6.
In that this code case-provides guidance for use of the laser velding process, the NRC Staff ~is requested:to review Code l
Case N-395 and-authorize its-use at Parley Nuclear Plant'for the sleeving process described above by October'1990.
y i
If you have any questions, please advise.
-j Respectfully u
- nitted,
,i V. G. Ilairston, III
-l VGil,III/ REM:mgd 21.28 Attachment cci Mr. S. D. Ebneter f
Mr.'S. T. Hoffman 081 I
.Mr. G. F. Maxwell-9007090000 900702 i-PDR -ADOCK 05000348 I
P PDC k,
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r CASE N-395 1
CASES OF ASME BOILER AND PRESSURE YESSEL CODE Approval Dess: February 30,1984 See Numerica!Inden hw espiretten end any reetfirmation deten.
Case N 396 wire feed,'or prior weld metal buttering of one or both Laser Welding joint faces.
Section lil, Division 1 (d) Postweld Rest Treatment i
(a) the addition or deletion of postweld heat j
treatment;
' Inquiry:.May laser welding be ned under Section (6) a change in the postweld heat treatment III, Division '1, to join P Nos. 8,10G,41,42,43, and 44 temperature and time nonge, materials not exceeding */4 in,in thicknem?
(5) Ces (a) a change from a single shielding gm to any Reply: It is the opinion of the Committee that leer' other single shielding' gas or to a mixture of shielding i
welding may be used under Section Ill, Division 1, to gases, or a change in specified percentage composition of '
join P.Nos. 8,10G, 41,42,43, and 44 materials not shielding gas mixture; i
4 exceeding */4 in. In thickness, provided that:
(6) the addition or deletion of one or more of 4
L (a) a Welding Procedure Specification shall be p:e.
the following: shielding gas, trailing shielding gas, back.
i pared and qualified in accordance with the require.
ing gas, or plasma removing gas; ments of Section IX; the following essential variables (c) a change of more than 5% in the flow rate shall apply:
of one or more of the following: shielding gas, trailer.-
- (1) Joints shielding gas, backing gas, and plasma-removing gas;
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(a) a change in the type of groove; (d) any change of environment shielding, such (6) the addition or deletion of a backing; as from vacuum to an inert gas or vice+ersa;
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- (e) an increase in the qualified fit up gap.
(e) a change in the position or_ orientation of (2) Base Metals _
coaxial transverse to beam).
plasma removing gas jet relative to the workpiece_(e.g.,
r (a) a change in base metal P. Number, type,or grade. When joints are to be made between base metals (6) Dectrical Characteristics,
from two different P-Numbers (and two different (a) any change in the beam pulsing frequency-i '
groups), a procedure quali6 cation must be made for the and pulse duration from that quali6ed; s
applicable combination of base metals even thaugh pro-(6) a change in one or more of the following:
cedure qualification tests have been made for each of the lens focal length, focal distance, and spot aise; -
two bue metals welded to itself.
(c) a change in mode of operation from pulsed I
. (6) Where the measurement of penetration can to continuous or vice versa;c i
be made by visual or mechanical means, requalification (d) a change in the wattage of more than 12%
is required where the base metal thicknem differs by from that quali6ed; 20% from that of the test coupon thickness. Where the (e) a change in energy distribution'across the measurement of penetration cannot be made, requalifi-beam (i.e., multimode or gaussian);
cation is required where the base metal thickness differs (f) a change in energy received by the work,
i by 10% from that of the test coupon.
piece.
(3) FillerMetals (7) Technique
- (e) the deletion or addition of filler metals;,
(a) the addition or ddetion of beam oscilla-(6) for filler metal additions, any change from tion; the nominal specified anasysis of the filler metal quali-(6) a change in width, frequency, or dwell time
- Sed; of beam oscillation; (c) any change in the method by which filler (c) a change from single to multiple pass or metal is added, such as preplaced shim, top strip, wire, vice versa;:
685 a
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CASE (continued).
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' N-395 CASES OF ASME BOILER AND PRESSURE VESSEL CODE t
l (d) a change in the type or model of the laser (i) the addition of a wash pass, welding equipment; (6) Requalification is required for any changes of j
(e) a change in welding speed of more than the essential variables from those quali6ed.
12%, or lens to work distance of more than 15%, from (c) The performance qualification for laaer weld.
those qualified; ing operators shall duplicate the test coupons, test speci.
- (f) a change from the melt.in technique to,
mens, and requirements of the Welding Procedure the keyhole technique of welding, or vicewems; Specification.
(g) a change from welding from one side to (d) This Case number shall be shown on the Data welding from both sides or vice verse; Report Form.
(h) a change in the method ofinitial and inter-paw cleaning; i
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