ML20151Y929
| ML20151Y929 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 04/25/1988 |
| From: | Esposito J PUBLIC SERVICE CO. OF NEW HAMPSHIRE, WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | |
| Shared Package | |
| ML20151Y818 | List: |
| References | |
| OL-1, NUDOCS 8805050149 | |
| Download: ML20151Y929 (3) | |
Text
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Dated April 25, 1988 UNITED STATES CF AMERICA NUCLEAR BEGULATORY CCF.MISSICN before the ATCNIC SAFETY AND LICENSING BOABD In the Matter of:
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PUBLIC SERVICE CCNPANY OF
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Ibcket Nos. 50-443-OL NEW HAMPSHIRE, et al.
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Docket Nos. 50-444-CL
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Seabrook Station, Units
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On-site &.ergency Planning 1 and 2)
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and Safety Issues AFFICAVIT CF JOHN N. ESPOSITO ON THE NCRTH ANNA TUBE RUPTURE EVENT I, John N. Esposito, being duly sworn, depose and state:
1.
I am employed by 'n'estinghouse Electric Corporation as Manager of Technology Development in the Service Technology Division of 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 Seacrook Units 1 and 2.
4 On July 15, 1987, a steam generator tube rupture occurred at North Anna Unit 1 De ruptured tube was located in Pow 9, Colu a 51, in steam generator C.
ne leakage location was found to be at the top tube support plate on the cold leg side.
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5.
The cause of the tube rupture was high cycle fatigue. The source of the loads.was a ccebination 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.
Centing at the tube support plates is a phenccenon 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 I
at North Anna will not occur in the Seabrook nuclear steam supply system because the requisite dented condition, will not 1
l occur because stainless steel support plates are used.
I Further affiant sayeth not i
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Jchr7 N. Esposito SUBSCRIIED AND SWOP to before c.e this 14 day of /-vil
, 1988.,,
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NOTAftY PUBLIC '
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'. er.n N. Espesite My name is.'cht. N. Ispesite. My cusiness address is P.O. 5:x 355, Fitts':urgr.,
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I w: ecs1vy,) ty 'destis.ghause E.0ctrio Cer;cratier, as 9asgea, Te:rt.ei:gy : eve'.:;r ent, Servi:e To:P.nclegy Civisier..
graduate:.? : Your.gsteht. University, Y angstev., @ic witn a !.S. Cagree t.
Cr.emistry in 196C.
- n '966, I received a Ph.. in 2.e.istry free Case
.nstnute et Twt.:rsigy, C;..14. 4, Chis.
- aise opent : p:rt ier. ef '9M ma?
1962 in service with the '.51:ed States Amy.
- n late 1965, after ec=p;etion :f all the requirerants for ths granting of the Fn.D. degree, I began er;1cyu.; with the 'destinghouse Electric Cer;crati n at the Cer. ra'. ?esearch Laborateries in Pit shurgni PA. I was continually
- e. ployed at those laboratorias until Novat:er cf '9?6.
At that ti?.e I transferred it.to the cer:tercial nuc'. ear pcwer civision. W 1ritial pcsiti:a was Manager, Cher.istry 7e:rt.cicqy. The responsibilities of this ;csitier included investigation of corrosien and 0:P.er fems of deg.ada:1:n f:r
'destinghouse steac generators. I have been involved witn steam generater related a:tivities to the preser.t ties. My present nAr.ageria; duties ir.:.'uce activities related te evaluatien Of stes:: ger.erator inspectice, data, stea-ger.erater r.aterials, and chemistry tecer.:legy studies re;ated to steam generators.
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