ML20086H384
| ML20086H384 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 01/09/1973 |
| From: | Minnick L VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20086H382 | List: |
| References | |
| NUDOCS 8401170086 | |
| Download: ML20086H384 (1) | |
Text
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') VERMONT YANKEE NUCLEAR POWER CORPORATION b2-a SEVENTY SCVEN OROVE STREET m
RuTi.Axo, VEltMONT OG701 3
REPLY TO:
ENGINEERING OFFICE
-i TURNPIKE ROAD WESTOORO. MASSACHUSETTS 01581 h
January 9, 1973 a
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United States Atomic Energy Commissicn a
Directorate of Regulatory Operations, Region I Q
970 Broad Street g
Newark, New Jersey 07102 3
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REFERENCES:
a) Operating License No. DPR-28 (Docket No. 50-271)
F b) USAEC Letter to Vermont Yankee dated June 22, 1972
-w c) Vermont Yankee Letter to USAEC dated July 21, 1972 g
w Gentlemen:
1 We wish to inform you that we have completed the wall thickness T
verification program for the valves in the reactor coolant pressure bound-ary at Vermont Yankee. The results of this verification program may be t
summarized briefly as follows:
7 M
The wall thicknesses of eighty-two (82) valves were ultra-sonically measured and the measurements indicated that core 7
shift had not occurred in any of these valves.
- However, ultrasonic neasurements of six (6) valves indicated areas of the valve wall which were below the requirements of Code
'E ANSI B 16.$.
Five ($) of these valves were found to be ac-ceptable under the provision of Reference (b) which allows C
a reduction in the wall thickness if the mechanical proper-5 ties of the meterial exceed the specification minimum by an amount, sufficient to compensate for the measured reduction F
in wall thickness. The remaining valve was accepted after E
an engineering evaluation indicated that the uall thickness A
was adequate for the service conditions and, if ordered today, would exceed the requirements of ASME Section III.
J._
e Engineering review of the documentation package for the valve g
verification program was completed by Yankee nuclear Servicca Division on December 1, 1972 and was foraarded to the plant site on December Ib, 1972.
Very truly yours, 9401170086 730206
{DRADOCK05000 VEP.MONT YANKEE NUCLEAR FOWER CORPORATION
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/ [ b t Lau; C-s L. E. Minnick, f
Vice President f
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