L-83-172, Discusses Mods to Batch C & 16 Selected Batch B Fuel Assemblies Similar to Mods at AR Power & Light Unit 2.Shims Installed on Guide Tubes to Increase Shoulder Gap & Holddown & Flow Plates Machined in Thickness to Maintain Length

Discusses Mods to Batch C & 16 Selected Batch B Fuel Assemblies Similar to Mods at AR Power & Light Unit 2.Shims Installed on Guide Tubes to Increase Shoulder Gap & Holddown & Flow Plates Machined in Thickness to Maintain Length

ML17213B189
Person / Time
Site:	Saint Lucie
Issue date:	03/24/1983
From:	Robert E. Uhrig FLORIDA POWER & LIGHT CO.
To:	Eisenhut D Office of Nuclear Reactor Regulation
References
L-83-172, NUDOCS 8303290472
Download: ML17213B189 (7)

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P OX 14000, JUNO BEACH, FL 3340B FLORIDAPOWER & LIGHT COMPANY March 24, 1983 L-83-172 Office of Nuclear Reactor Regulations Attention:

Mr. Darrell G. Eisenhut, Director Division of Licensing U.

S. Nuclear Regulatory Commission Washington, D.C.

20555

Dear Mr. Eisenhut:

Re:

ST.

LUCIE UNIT NO.

2 DOCKET NO.

FUEL ASSEMBLY MODIFICATION Results of fuel assembly inspections at Arkansas Power

& Light's ANO-2 plant (Docket 50-368) made it evident that an increased assembly shoulder gap might be needed in those ANO-2 assemblies experiencing three or more cycles of operation.

(This is due to the higher than predicted rate of growth of the fuel rod relative to the growth of the assembly guide tubes)

~

Modifications were made to selected ANO-2 assemblies to ensure adequate shoulder gap to accommodate this difference in rates of growth.

For the St.

Lucie Unit No.

2 Batch C assemblies and sixteen (16) selected Batch B assemblies, a similar modification was performed. 'his involved installing shims on the guide tubes to increase the shoulder gap and machining the holddown and flow plates of the upper end fitting to a

reduced thickness for compensation to maintain the overall assembly length (see attached sketch).

The net result is the following:

1.

'The shoulder gap is increased by approximately 0.450".

This was accomplished by reducing both the holddown plate and the flow plate thicknesses, 2.

Assembly

length, compression spring

length, holddown force and the ability to reconstitute the assembly are maintained.

3.

All design criteria continue to be satisfied except for the design lifting capability.

The reduction in the thickness od the holddown plate necessitates a reduction in the allowable liftin'g load from 5,000 pounds to 3,000 pounds.

This is more than adequate considering the weight of a fuel assembly with a

CEA is less than 1,400 pounds.

Moreover, load lifting,limits on the refueling machine and the spent fuel handling machine ensure that speci'fied loads will not be exceeded.

~,8303290472 830324

.-4wPDR ADOCK 05000389 PDR PEOPLE... SERVING PEOPLE

The above fuel assembly modifications provided assurance that the observations at ANO 2 have been factored into the St.

Lucie Unit No.

2 design.

Should you have any questions regarding this

matter, please do not hesitate to call.

Very truly yours,

~A.~

Robert E.

rig Vice President Advanced Systems and Technology REU/RJS/PPC/rms Attachment cc:

J.

P. O'Reilly, Region IE Harold F. Reis, Esquire

R0 I

ORlGIHAL GONFIGURATfON I

COMPARISON OF ORIGINAL AND SHIMMED UPPER END FITTINGS SHIMMEO CONFIGURATiON Holddowo Pl ate Flow Plate AOMMtlAL SHOULDO)

GAP

4