ML20002A105
| ML20002A105 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 03/30/1979 |
| From: | Moody D VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-79-03, IEB-79-3, WVY 79-36, WVY-79-36, NUDOCS 7905070693 | |
| Download: ML20002A105 (1) | |
Text
6 t A FEZi L
L VERMONT YANKEE NUCLEAR POWER CORPORATION SEVENTY SCVEN OROVE STRCCT B.4.2.1 Ru rtAxo, VennoNT osvon REPLY TO:
ENGINEERING OFFICE TURNPIKE ROAD WEsTBORO. M ASS ACHUSETTS 01581 TELEPHON E $ 17.3 66.9018 WY 79-36 March 30, 1979 United States Euclear Regulatory Co= mission Inspection and Enforcement' Office Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 Attention:
Boyce H. Grier, Directior
References:
(a) License No. DPR-28 (Docket No. 50-271)
(b)
I&E letter to VYNPC dated March 12, 1979 -
I&E Bulletin No. 79-03
Dear Sir:
Subject:
Response to I&E Bulletin 79-03 The Ver=ont Yankee Nuclear Power Station piping systems were designed and fabricated in accordance with the requirements of ANSI B31.1 Power Piping Code. The B31.1 Code specifies che use of ASTM material grades (i.e. A312 vice SA 312). The B31.1 Code also requires reduced stress allowables for welded pipe, rather than the ASME Code approach of increased allowables coupled with non-destructive evaluation.
- Thus, r
1.
there vac no Code requirement to inspect rolled and welded type A312 pipe for this plant; 2.
the design Code required a reduced stress allowable to compensate for the seam weld; 3.
the requirement for the inspection of'the seam weld is an ASME section III requirement, not a requirement of ASME Section II, SA 312 caterial specification, so only plants that were designed and fabricated under the rules of ASME Section III would be affected.
For,these reasons, we believe no further action is necessary in res-ponse to Reference (b).
L'e trust this information will be satisfactory.
If you have any ques-tiens, please feel free to contact us.
^
Very truly yours, NERMONT YANKEE NUCLEAR P0k'ER CORPORATION 7905070673 M
Manager of Operations L
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