ML20086D923

AO 73-30:on 731005,fuel Channel Insp Begun,Due to Discovery of Condition at Another Bwr.Initial Results Indicate of Seven Channels Inspected,Five Exhibit Signs of through-wall- Wear.Program for Ultimate Resolution Developed

ML20086D923
Person / Time
Site:	Vermont Yankee
Issue date:	10/12/1973
From:	Riley B VERMONT YANKEE NUCLEAR POWER CORP.
To:	US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20086D919	List: ML20086D923 ML20086D926
References
AO-73-30, VYV-3053, NUDOCS 8312050668
Download: ML20086D923 (1)

Text

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. _ tf VMnMO'NT YANKElc NUCLEAR POWER COR PORATION A

ScVENTY SEVEN OROVC GTRECT R11TLAND, VEltMONT OG701 REPLY TO:

VYV-3053 e. o. nox 157 VERNON. VERMONT o5354

! October 12, 1973 Director N/

Directorate of Licensing 8 \\

p-N United States Atomic Energy Commission i Washington, D.C. 20545 g I

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REFERENCE:

Operating License DPR-28 -

OCT 151973 "

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Docket No. 50-271 g U.S. Atamic tamy 7

Abnormal Occurrence No. A0-73-30 CommiWan Requb wy ,

j Gentlemen: Cd g

AsdefinedbyTechnicalSpecificationsfortheVermo7'tebe I Nuclear Power Station, Section 6.7.B.1, we are reporting the following nnnrmu. ..ccu,,r.n.e m. ,u,-,.,.,u. .,

As a result of a condition discovered at another boiling water l reactor, an inspection of fuel channels was begun on October 5,1973.

1 Initial results indicate that of a total of 7 inspected- to date, 5  ;

exhibit signs of "through-wall-wear" . This incident is interpreted .]

to be reportable as' defined by Section 1. A.4 of the Technical '

!]

Specifications. The fuel channels provide a barrier to separate two- j parallel flow paths - one to cool the fuel bundles and the other to i cool the bypass region between channels. This discovered wear pattern . j

]

is a partial impairment of channel flow.

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As of 0800 on October 12, 1973, a total of 105 channels have been  !

j inspected. Of this number, 28 have been observed to exhibit visible defects. Of these,10 have defects that completely penetrate the channel and the remainf ug 18 have visible defects which do not perforate-the channel, but f ail tc meet the acceptance criteria.

At this time, a precise program dedicated to ultimate. resolution of this problem is being developed. We will advise your office relative to

our total program as soon as final development is completed.

i 8312050668 731012 Very truly yours, PDR ADOCK 05000271 l

' PDR VERMONT YANKEE NUCLEAR POWER t0RPORAT10N 7 vgi 3 "

Bradford W. Riley i Plant Superintendent WFC/kbd  :/D83-COPY SEyr nrmog_ ,

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