ML20234C894

Affidavit of Jn Esposito on North Anna Tube Rupture.* Discusses Tube Rupture Event,Including Mechanism Which Led to Event & Shows Dissimilarities W/Steam Generators at Plant.Related Info Encl

ML20234C894
Person / Time
Site:	Seabrook
Issue date:	11/20/1987
From:	Esposito J WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML20234C672	List: ML20234C670 ML20234C720 ML20234C827 ML20234C848 ML20234C869 ML20234C872 ML20234C894 ML20234C912 ML20234C996 ML20234D014
References
OL, OL-1, NUDOCS 8801060364
Download: ML20234C894 (3)

Text

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Ihted November 20, 1987 UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION before the ATOMIC SAFETY AND LICENSING BOARD l

In the Matter of: )

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PUBLIC SERVICE COMPANY OF ) Ibcket Nos. 50 443-OL NEW HAMPSHIRE, et al. ) Ibcket Nos. 50-444-OL

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Seabrook Station, Units ) On-site Dnergency Planning 1 and 2) ) and Safety Issues AFFIDAVIT OF JOHN N. ESPOSITO ON THE NORTH ANNA TUBE RUPTURE EVENT I, John N. Esposito, being duly sworn, depose and state:

1. I am employed by Westinghouse Electric Corporation as Manager of Technology Development in the Service Technology Division of l the Power Systems Business Unit.

2. My professional qualifications are attached hereto and marked "A".

3 The purpose of my affidavit is to provide a discussion of the North Anna tube rupture event including the mechanism which led to the event and show that it is not applicable to the steam generators installed at Seabrook Units 1 and 2. 1

4. On July 15, 1987, a steam generator tube rupture occurred at  !

North Anna Unit 1. The ruptured tube was located in Row 9, Column 51, in steam generator C. The leakage location was found to be at the top tube support plate on the cold leg side.

8801060364 880104~4 PDR C ADDCK 05000443 PDR

. 5 The cause of the tube rupture was high cycle fatigue. The source of the loads was a combination of a mean stress level in the tube and a superimposed alternating stress. The mean stress was produced by denting of the tube at the top tube support plate and the alternating stress was due to out-of-plane deflection of the tube above the top tube support caused by flow induced vibration.

6. Denting at the tube support plates is a phenomenon which experience has shown has only occurred with carbon steel material.

7. The steam generators installed in the Seabrook nuclear steam supply system are Model F steam generators which utilize stainless steel support plates, not carbon steel.

8. A steam generator tube rupture event of the type that occurred at North Anna will not occur in the Seabrook nuclear steam supply system becat.se the requisite dented condition, will not occur because stainless steel support plates are used.

Fu 'W aff%nt sayeth not John N. Espto 1

SUBSCRIBED AND SW RN to before me this g f day o g7hrfm/, 1987. /

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i John N. Esposito

Py name is John ti. Espesite. My business address is F.C. Box 355, Pittsburgn, PA.,

i5235.- I w: emp1vywd by Westinghsose Elcotria C0rporatien as >> cage ,

Technc10gy Devel0pment, Service Techno1cgy Divisien.

I graduate: frot-Youngstewn University, Yeangstown, Ohio with a B.S. Degree i .

Chemistry in 196C. :n 1966, I received a Ph.0. in Chemistry from Case ins:1 ute of Teut.:rsicey, Cle. 16. 4, Ohio. : aise opont : pertien er 1961 3 2 1962 in service with the United States Army.

n late 1965, after cc p;etion of all the requirements for the granting of the Ph.D. degree, I began employmer.t with the Westinghouse Electric Corporation at the Centrai ?esearch Laboratories in Pittsburgh, PA. I was continually employed at those laboratories until November cf 1976. At that time I transferred ir.to the commercial nuclear power division. My initial positi n was Manager, Chemistry Technology. The responsibilities of this pcsitiet.

included investigation of corrosien and other forms of degradation for Westinghouse steam generators. I have been involved with steam generator related activities to the present time. My present managerial duties include activities related to evaluatien of steam generator inspection data, steam generator caterials, and checistry technology studies related to steam generators.-

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