ML20050A008

RO Re Steam Generator Tube Plugging as Specified in Tech Spec 4.4.5.1.4.Degradation Resulting in Tube Plugging Is Characterized by Localized Areas of Small Pits on Tube Outside Diameter.Investigation of Corrosion Cause Continues

ML20050A008
Person / Time
Site:	Millstone
Issue date:	03/18/1982
From:	Mroczka E NORTHEAST NUCLEAR ENERGY CO.
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
MP-2-5096, NUDOCS 8203290537
Download: ML20050A008 (1)

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March 18, 1982 a -

MP-2-5096 .' .

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e-Mr. Ronald C. Haynes f D, f > Regional Administrator, Relion I '

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- Office.of Inspection and , Enforcement E .-rer-e g D $

'U'.S. Nuclear Regulatory Commission a """ -

631 Park Avenue ' 5 . .g Gj982W -10

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. King,of. Prussia, Pennsylvania 19406 -

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be Referencef Facility Operating License No. DPR-65.  ;

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Dock'et No.' 50-336-r .

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De'ar Mr. Haynes: ,

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. This letier is submitted pursuant to Millstone Unit 2 Appendix A

, 'g , Te'chnicai Specification Section 4.4.5.1.5.A, Report of Steam Generator Tube Pl.ugging. ^

Re'Ni' min accordance ewith Technical Specification Section 4.4.5.T.4, all-steam u generator stubes with degradation'in excess of the plugging limit were

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. remobed ,froni service by plygging. Four tubes in Steam Generator No.1

'were removed from seFvice because:they were cut to allow removal of tube samples for investigation of the cause of degradation. Four tubes would no pass a 0.540 inch diameter e y current probe'. A total of j 425 tube s (were plugged in., Steam Genera @ tor No. I and 284 tubes in Steam

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-Generator No72: ,

The degradation which,r'sulted in tube plugging is chgracterized by

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localizqdareasofsmQ1pitsonthetubeoutsidediameter. Investigation of the causes of this corrosion is continuing. A final report of the

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results of this investigation.and the , corrective actions proceeding from it will be provid'i.

Yours truly, NOR HEAST NUCLEAR ENERGY COMPANY

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IJ.Mroczka'l Station Superintendent Millstone Nuclear Power Station D

EJM/JJK:mo cc: Director, Office of Inspection and Enforcement Washington, D.C.

0203290537 020310 f6gp PDH ADOCK 03000336 0 PDH

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