ML20086H384

Informs That Verification Program for Wall Thickness of RCPB Valves Completed.Valves Acceptable

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: ML20086H384 ML20086H390
References
NUDOCS 8401170086
Download: ML20086H384 (1)

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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 &

TURNPIKE ROAD ' -i WESTOORO. MASSACHUSETTS 01581 h January 9, 1973 voto,soso.,,.3....o,,

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United States Atomic Energy Commissicn a Directorate of Regulatory Operations, Region I 970 Broad Street Q

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

• was adequate for the service conditions and, if ordered today, A 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; L. E. Minnick, f Vice President f

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