ML19316B112
| ML19316B112 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 06/06/1980 |
| From: | Parker W DUKE POWER CO. |
| To: | Harold Denton, Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8006110327 | |
| Download: ML19316B112 (4) | |
Text
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DUKE POWER COMPANY Powra Buttntxo 422 Sourn Cucacu SrazzT, CHARLOTTz, N. C. 28242 W I LLI AM O PA R M E R. J R.
s.en p.cocc~v June 6, 1980 TrigswoNE: AREA 704 Set.
peooscrio%
y 3_ e.3 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Cormaission Washington, DC 20555 Attention:
Mr. B. J. Youngblood, Chief Licensing Branch No. 1
Subject:
McGuire Nuclear Station Docket Nos. 50-369 and 50-370
Dear Mr. Denton:
As requested by Mr. B. J. Youngblood's letter of May 12, 1980, please find attached information on the reactor vessel nozzles at McGuire Nuclear Station Units 1 and 2.
Very truly yours, Villiam O. Parker, Jr.
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McGuire Nuclear Station Response to May 12, 1980 NRC Request for Information On Reactor Vessel Nozzles McGuire Unit 1 Question: Nozzle base metal material specification type and grade.
Response: The base material of all nozzles in the McGuire Unit I reactor vessel is ASTM A-508 Class 2.
Question: Clad process type, electrode size and number of clad layers.
Response: Nozzle Bore - Three clad layers using the automatic gas metal are welding process with oscillation and a single 1/16" diameter wire.
Nozzle Radii and Prolongations - Either two or three clad layers using the shielded metal are welding process with 5/32" diameter electrodes for all layers.
Question: Heat Input (amps, volts, speed) for each clad layer.
Response: Nozzle Bore First Layer: amps = 250; volts = 29-30; speed = 6 inch / minute Remaining Layers: amps = 275; volts = 29-30; speed = 7 inch / minute Nozzle Radii and Prolongations Flat First Layer; amps = 140; volts = 23-24; speed = %8 inch / minute Remaining Layers; amps = 115-145; volts = 23-24; speed = N8 inch / minute Horizontal = First Layer; amps =115; volts =22-23; speed =%8 inch / minute Remaining Layers; amps =110-140; volts =22-23; speedas8 inch / minute Question: Clad pre-and post-heat treatment and interpass temperature for each clad layer.
Response: Nozzle Bore - Pre-heat temperature was 250 F minimum and held until all cladding and a post-weld heat treatment (PWHT) was completed.
The interpass temgerature was 350 F maximum and the post-heat tem-perature was 1150 F i 25 F.
Nozzle Radii and Prolongations - Pre-heat temperature was 250 F minimum and held until all cladding and a post-weld heat treatment (PWHT) was completed. The interpass temperature was 350 F maximum and the post-heat temperature was 1150 F i 25 F.
Question: Vessel stress relief treatment.
Response: Nozzle Bore, Radii and Prolongations Intermediate PWHT = 1100" - 1150"F held for 15 minutes.
Final PWHT = 1150 1 25 F held for one hour per inch of weld thickness.
l 1
. Question: Manufacturer or subcontracter who fabricated vessel and applied nozzle cladding.
Response: The reactor vessel was manufactured and the nozzles clad by Combustion Engineering at Chattanooga, Tennessee.
McGuire Unit 2 Question: Nozzle base metal material specification type and grade.
4 ReIponse: The base material of all nozzles in the McGuire Unit 2 reactor vessel is ASTM A-508 Class 2.
Question: Clad process type, electrode size and number of clad layers.
Response: Nozzle Bore - Two clad layers using submerged arc strip process using a 60mm x 0.5mm strip.
Nozzle Radii (Inlet Nozzle) - Two clad layers using shielded metal are cladding with 4mm diameter electrodes for first layer and 3.25mm, 4mm, or 5mm diameter electrodes for second layer.
Nozzle Projection (Outlet Nozzle) - More than two clad layers (thickness 17mm) using shielded metal are cladding with 4mm diameter electrodes for first layer and 3.25mm, 4mm, or 5mm diameter electrodes for subsequent layers.
Question: Heat input (amps, volts, speed) for each layer.
Response: Nozzle Bore First Layer: amps =600-630; volts =28-32; speed =15-16 cm/ minute Second Layer: amps =600-650; volts =29-33; speed =10-12 cm/ minute Nozzle Radii and Projections First Layer: amps =90-135; volts =%22-24, speed =s18 cm/ minute Subsequent Layers: Elect. Dia.
Amps Volts Speed 3.25 70-110 s22-24 s18 cm/ minute 4
90-150 E22-24 518 cm/ minute 5
130-220 522-24 518cm/ minute i
Question: C1cd pre-and post-heat temperature and interpass temperature for each clad layer.
Response: Nozzle Bore - Pre-heat temperature of 40 C for first lager, no pre-heat on second layer.
Interpass temperature of 100 C maximum for first layer and 125 C maximum for second layer. Post-heat temperature of 210 C - 220 C for two hours af ter welding of first 1ayer.
Nozzle Radii and Projections - Pre-heat temperature of 100 C -
150"C for first layer, no preheat on subsequent layers. Interpass k
_ __..._~ __...
. _. ~.
~
. remgerature of 175 C maximum. Post-heat temperature of 210 C -
220 C for two hours after welding of first layer.
Question: Vessel stress relief treatment.
Response: Nozzle Bore, Radii and Projections Intermediate PWHT = 210 C - 220 C.for two hours after welding of first layer.
Final PWHT = 595 - 635 C held for a minimum of one hour per inch of weld thickness.
Question: Manufactorer o'r subcontractor who f abricated vessel and applied.
nozzle cladding.
Response: The reactor vessel was manufactured and the nozzles clad by.
Rotterdam Nuclear of the Netherlands.
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