ML20031D517
| ML20031D517 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 03/08/1978 |
| From: | C.N. FLAGG & CO., INC. |
| To: | |
| Shared Package | |
| ML20031D456 | List:
|
| References | |
| RTR-NUREG-0619, RTR-NUREG-619 CNF-FF, NUDOCS 8110130408 | |
| Download: ML20031D517 (6) | |
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AL1, C. N. FLAGG & CO., INC.
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MILLSTONE UNIT I PROJECTS PROCEDURE NO:
CNF-FF ISSUE:
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General Procedure for Post Weld Heat Treatment PROCEDURE TITLE:
APPROVALS
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APP.
PAGE 1 OF 5 PAGES MTF APP CENERAL PROCEDURE FOR POST WELD HEAY TREATMENT REY.
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DATE APP FF-1 SCOPE: The purpose of this section is to state the general requirements of post veld heat treatment operations that are to be conducted in accordance with Section III, Class 1, 2 or 3 of 1.he ASME Code. These requirements are applicable, regardless of the specific method selected.
rF-2 METHODS:
Post weld heat treatment operations shall be conducted with a meth-od which is not injurious to the base or weld metal.
The method shall be capable of maintaining and controlling the predetemined heating and cool-ing rates, the metal holding temperature level and the proper metal tem-perature uniformity. Refer to the following specific procedures for the 3
acceptable methods of post weld heat treatment:
PROCEDURE METHOD FFA Furnace FFB Electric resistance (local)
FFC Electric induction (local)
FFD Propane or natural gas (local).
FF-3 POST WELD HEAT TREATMENT REQUIREMENTS: The post weld heat treatment require-ments of Section III, C1.sss 1, 2, or 3 of the ASME Code shall be adhered to (see Supplements I and II). These requirements may be augmented by Project Specifications. The heat treatment requirements of each welded joint under the jurisdic. tion of the Code shall be stipulated on the ap-plicable Traveler Drawing.
FF-4 EXEMPTIONS TO POST WELD HEAT TREATMENT REQUIREMENTS:
In accordance with Section III of the ASME Code., the various categories of welds sted in Supplement III and the following are exempted from the post weld heat
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PAGE 2 OF 5 PAGES REV..
APP.
DATE APP GENERAL PROCEDURE FOR POST WELD HEAT TREATMENT yp, DATE APP treatment requirements of this procedure.
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A) Non-ferrous metals B) Welds subjected to temperatures above the post weld heat treatment temperature range specified in the above referenced table, provided the welding procedure is qualified in t.ccordance with Section IX of the Code and the base metal and deposit weld metal of the filler material has been heat treated at the higher tempa.rature.
FF-5 RECORDS OF POST WELD HEAT TREATMENT: Time and temperature recordings shall be made for each post weld heat treatment operation. These recordings shall have the welds, assembly, items and/or components identification
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numbers, date, and procedure number permanently imprinted on them.
FF-5.1 REVIEW OF RECORDINGS:
The Quality Assurance Supervisor shall review and approve all time and temperature recordings and zhall maintain them as part of the Quality Assurance Pmject File. All time and temperature recordings shall be made avail-able to the Authorized Nuclear ~nspector.
FF-6 HEATING AND COOLING RATES: Regardless of the method used, the heating or cooling rate at ' temperatures above 800 F. shall not exceed 400 F. per hour divided by the maximum thickness in inches of the material being heat treated. But, in no case, shall the heating or cooling rate above 800 F. per hour exceed 400 F. per hour.
During the heating and cooling period, there shall not be a greater varia-f tion in temperature than 250 F. In any 15 foot interval of veld length.
s The following exemptions are pmvided:
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APP.
GENERAL PROCEDURE FOR POST WELD HEAT T APP DATE_
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APP _
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APP DATE_
ASME P-No. 6 materials may be cooled in air from the post weld heat A) his treatment holding temperature specified in Supplement I of t Section.
For ASME P-No. 7 materials, the coo'.ing rate at temperatures above 1200 T. shall not exceed 100 T. per hour, after which the rate of B) cooling shall be sufficiently rapid to prevent a6cittlement.
f The holding time at temperature as specified by the Code i
FT-7 HOLDING TIME:
It may be an accumula-(Supplement I, Table I) need not be continuous.
j tion of the time of multiple post weld heat treated cycles.
Weld When stipulated by the W.P.S. the post weld heat treatment of the Procedure Qualification coupon (s) shall be (as a minimum) 80% of lication imum time to be applied to the weld metal in the production app The cooldown rate from the timed holding temp-requiring heat treatment.
h ld metal p
erature shall be of the same order as that applicable to t e we in the component.
i its be ex-Only with prior Q/A Manager approval shall time / temperature l m ceeded.
i ts of A holding time at a temperature higher than the minimum requ remen tested Table I (Supplement I) may be used, provided that specimens are II of the ASME in accordance with the applicable sub-sections of Section I Code.
, The " nominal thickness" which controls the post weld ials MATERIAL THICKNESS:
heat treatment time at temperature requirements of the various FT-8 i l or listed is the thickness of the veld, the pressure retaining mater a is less.
the thinner of the sections being joined whichever The fillet welds, the " nominal thickness" is the throat thickness.
" nominal The partial penetration welds and material repair welds, the i
thickness" is the depth of the weld groove or preparat on.
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PAGE 4 op 5 PAGES REY. _
APP.
DATF APP GENERAL PROCEDURE FOR POST WELD HEAT TREATMENT DATE APP-FF PRECAUTIONS DURING HEAT TREATMENT: At no time during post veld h'at treat-e ment operations 2han any water or cooling medium be anowed to come into contact with the metal being treated unless permitted by applicahie material specification. Direct flame impingement is prohibited in furn-ace beat treatment. All heating and cooling must be performed in still air.
FT-10 SUPPORT DURING HEAT TREATMENT: Regardless of method, the piping on butn sides of any joint shan be adequately supported during heat treatment opemtions. Where a joint is subject to cold spring during these opera-tions, the adjacent piping shall be suitably restrained so as to prevent straining of the weld.
FF-n REQUIRD(ENTS FOR DISSIMILAR MATERIALS: When pressure retaining materials of two different P-Number groups are joined by telding, the applicable post l
weld heat treatment shall be that specified for the material requiring the higher PWirr temperature range.
Joints made between austenitic stainless steel and other materials and which require post weld heat treatment shall be stress relieved by special procedures issued by the Quality Assurance Department.
TT-12 REQUIRD(ENTS FOR DISSIMILAR SERVICE CONDITIONS: When non-pressure retaining materials are welded to pressure retaining materials, the heat treatment temperature range of the pressure retaining waterial shall control.
TF-13 SPECIAL REQUIREMENTS FOR ALLOY STEELS: Alloy steels containing 5 to 9 per-cent chromium shall generally be stress relieved insnediately after welding p
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or forming without allowing the weld or adjacent material to cool below I
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ISSUE 5/26/76 W
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APP.
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APP.
GENERAL PROCEDURE FOR POST WELD HEAT TREATMENT DATE APP the prescribed preheat temperature.
If immediate full stress relief is impractical, the material shall be given a partial stress relief by gradual heating to 1325 F. + 25. This temperature shall be held for one hour, after which the material shall be allowed to slowly cool in still air while being covered with a suitable insulation blanket. This partial stress relief shall be applied after welding or forming and be-fare the weld or adjacent material has fallen below the preheat tempera-ture. After the partial stress relief, the material must be given a full post weld heat treatment commensurate with the alloy. All partial stress relief operations must be approved in advance by the Quality As-surance Department.
FF-1t+ CHANGES TO EEAT TREATMENT PROCEDURES: No changes shall be made to the general or specific heat treatment procedures unless approved by the Quality Assurance Department.
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