ML17250A542
| ML17250A542 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 08/05/1980 |
| From: | White L ROCHESTER GAS & ELECTRIC CORP. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-79-03A, IEB-79-3A, NUDOCS 8009110485 | |
| Download: ML17250A542 (4) | |
Text
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S9 EAST AVENUE, ROCHESTER, N.Y. 14649 LEON D. WHITE. JR.
VICE PRESI CENT TELEPHONE ASST COOS Tia 546-P.700 August 5, 1980 Mr. Boyce H. Grier, Director U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region I 631 Park Avenue King of Prussia, Pennsylvania 19406
Subject:
IE Bulletin No.79-03A, Longitudinal Weld Defects in ASME SA-312, Type 304 Stainless Steel Pipe R. E. GinnaMuclear Power Plant, Unit Ol Docket
- o. 50-24'4
Dear Mr. Grier:
As stated in our response to NRC IE Bulletin 79-03 dated April 6, 1979, Ginna Station does not utilize ASME SA-312 Type 304 Stainless Steel Pipe with longitudinal seam welds manufactured by Youngstown Welding and Engineering Company nor by any other piping manufacturers.
Ginna Station's Class 2 piping was originally designed to ASA-B36.19 and B36.10 with refer-ence to ASTM A-312 Type 304 Stainless Steel Seamless Pipe.
Due to the NRC's concern that the CLP (centerline lack of penetra-tion) problem is a significant deficiency which could result in repair or replacement of pipe and/or fittings, a further review of our safety-related stainless steel system has been completed.
One fitting with longitudinal seam welds has been identified in our plant.
The following information regards the fitting identified:
1.
System 2.
Location 3.
Code 4.
Design Pressure 5.
Design Temperature 6.
Nominal Size 7.
Nominal Wall 8.
Material';
Allowable Stress 10.
Calculated minimum wall thickness for internal pressure Residual Heat Removal Containment Vessel Basement USAS B31.1.0-1.967 2485 psig 650 P 10 inch 1.000 inches A403 WP 316 (automatically welded) 16,000 psi 0.898 inches 3009110485
ROCHESTER GAS AHD ELECT.
CORP.
DATE August 5, 1980 Mr. Boyce H. Grier, Director SHEET HO.
2 11.
Actual wall thickness 12.
Manufacturer
- 1. 10 inches Flowline Corporation The elbow in question received 100% radiography of the longitudinal weld joint during original fabrication.
Therefore, a weld joint efficiency factor of 1.0 can be used rather than 0.85.
For this reason, the calculated minimum wall thickness shown is based on 100% of the code allowable stress.
The calculation did include a factor of 0.875 to account for manu-facturing tolerance.
In 1971 Inservice Inspection utilizing the ultrasonic method in accordance with ASME Code Section XI was performed on these longitudinal seam welds with no recordable indications.
Pleasenote that this elbow is isolated from the Reactor Coolant System during normal operation and only operates at 400 psig and 350 F during RHR System operation.
Very truly yours, L. D. Whi e, Jr.
cc:
U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Division of Reactor Construction Inspection Washington, D. C.
20555
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