ML19319E138

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Forwards AEC to B&W Re Vibration Analysis & Test Program for Prototype Reactor Internals
ML19319E138
Person / Time
Site: Rancho Seco
Issue date: 08/29/1972
From: Deyoung R
US ATOMIC ENERGY COMMISSION (AEC)
To: Davis E
SACRAMENTO MUNICIPAL UTILITY DISTRICT
References
NUDOCS 8003310657
Download: ML19319E138 (1)
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, ATOMIC' ENERGY C%iMiSSION

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AUG 2 S W2 Mr.~ Jades?F. Mallay-(Manager, Licensing

.Nucicar" Power-Generation BabcockT& Wilcox P.30.iBox'1260.

Lynchburg, Virginia 24550-

Dear Mr.:

Mallay::

iWe have been advised that Babcock & Wilcox (B&W) is preparing topical. reports concerning-(1) the assessment of damage to the Oconee Unit i reactor internals-due to flow induced vibration, (2) the redesign of the reactor internals of

'B&U reactors to reduce flou induced vibration and (3) the vibration predictions

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and monitoring equipment for the Oconee Unit i vibration testing program.

Because these reports are'an essential element of our evaluation'of applications

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for operating licenses for several-facilities, i.e., Oconee Nuclear Station.

Units 2'and 3, Three Mile-Island nuclear Station, Unit 1,. Arkansas Nuclear One, ; Unit '1,.and Rancho Seco Nuclear Generating Station, we will need these topical reports on or before September 15, 1972.

If you are unabic~to comply

- with this schedule, it. is.lihcly that the overall schedule for. completing the licensing review for these projects vill-have to be extended.

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- Because B&W has designated Oconee Unit l'as the prototype reactor for vibration measurements, the results 'of these'Oconee Unit 1 neasurements will affect a

- number of facilities. If Oconee Unit 1Ils not properly established'as an

- acceptable prototype,'another. facility will necd'to be established as a prototype or;each specific: facility...will need to' perform a complete program of vibration testing ss defined in Safety Guide 20, " Vibration Measurements on Reacter-Internals", before any licensing action can be completed. Due to the' number-'of projects poteist-ially affected, we believe it prudent'to consider

. contingency plans at this time. -Please inform us of your proposed course of

~ actioniin'theLevent that you are not'able to establish the Oconee Unit 1 as an acceptable' prototype.-

,Please contact us if you desire any discussion or clarification of the

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. y materia 1Trequested.

Sincerely, ll

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R. C. DeYoung, Assistant Directt.

for Pressuriced Water Reactor-Directorate'of Licensing.

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