ML19312C913

Transfers Lead Responsibility Re Review of Fuel Lifting Discrepancies.Ie Recommendations & Proposed Action Described

ML19312C913
Person / Time
Site:	Oconee
Issue date:	05/23/1975
From:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:	Goller K Office of Nuclear Reactor Regulation
Shared Package
ML19312C914	List: ML19312C913 ML19312C917
References
IE-C&O-75-12, NUDOCS 8001140576
Download: ML19312C913 (2)

Text

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TRNiSFER OF LEAD RESF0:iSIBILITY

,To:

K. R. Goller, Assistant Director fc,r Operating Reactors, RL 1

Subje_ct:

Core LifL Flow Considerations Facility:

Oconce 2 and 3 - Locket Hos.

0-276/and50-237 v

I Responsible Granch Chief:

K. V. Scyfrit i

Describtion of Iten Requiring Resolution:

4 The nest recent CaLcock and '.illcox cualysis sho::s that for Oconce. Unit 2, fuel lifting tould occur at 111.4% -f design flow at end of core i

life. This is 0.5% less than the predicted core lift flow rate of 111.s for the present point in co e life. The present Unit 2 flow

~i rate is belicved to be 111.5% of desDn. Detcruination of this value is questionable due to instrtracntation icccuracies. The enclosed i

analysis from Cabcock and Milcox assumes th6t 111% of design flow is sufficient to lift approximately IC centrally located fuel assenblics i

containing centrol rod assu,.blies.

(

Tnc licensee has conducted tests in 3 and 4 loop configurations to i

detcct any vertical displacement of fuel. These tests ucre conducted ac 70% forer using fast response incere probes. A telephone conversa-tion with IE:II (T.N. Epps) on May 13, 1975, indicates that no vertical displaccant of the fuel rias detected during the test.

IE is also cen:crned that utren clexut lift occurs a portion of the flow would bypass the lif ted elment and lead to " bouncing" of the el e;cnt. There is also a possibility of chaffing during eleaent lift.

j IE Recentnendations and Proi.csed Course of Action:

t 1.

The Division of Reactor Licensing will review Babcock and Wilcox's analysis dated May 12, 1975 and determine, based on present flow i

rates, if any operating restrictions should be imposed on the licensee.

i 2.

The Office of Inspection and Enforcement will provide additional informtion as available from our inspection cfforts, h

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2 1975 Tran:fer of Lead P.esion:f bility \\

The Office of Inspection and Enforconcat will verify adherence -

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to any requirrsents imposed by the Division of Reactor Licensing.

Reference:

I 1.

Ikno froa F. J. Long to 11. D. Thornburg dated liay 6,1975 1

2.

Dabcock and Wilcox Telecopy to F. Long dated iby 2, 1975 - 5 pages

_Concurrer.ca:

CrUn!syniby

r. s atnt T3. H. Grier, Assfttant Director for Construction & OperatTons, IE Date j

Giler, Assistant Direct:;r for Operating Reactore, P.L

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Date cc: D. F. Dmth IE A. Gicidusso, il J. G. Cavis, IE R. Purple, RL L. W.1:cLonough, RL K. V. Scifrit, IE G. W. Refre.uth, IE J.11. Saiczck, IE it. D. Thornburg, IE J. P. O'Reilly, IE:I fi. C.

• oseley, IE:II J.' G. T.cppler, IE:III E. f t.1:o : rd, IE:IY R.11. Engelken IE:V o

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