ML20092C806

Advises of Licensee Plans to Double Storage Capacity of Fuel Vault

ML20092C806
Person / Time
Site:	Rensselaer Polytechnic Institute
Issue date:	08/16/1991
From:	Harris D RENSSELAER POLYTECHNIC INSTITUTE, TROY, NY
To:	Brown K ENERGY, DEPT. OF, IDAHO OPERATIONS OFFICE
References
NUDOCS 9202120103
Download: ML20092C806 (6)

Text

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• Pt I.*N I !M W 5 August 16,1991 Mr. Keith R. Brown Office of External Affairs U.S. Department of Energy Idaho Operations Office One Energy Drive -

Idah<> Falls, ID 84302

Dear Sir:

The RCF Fuel Vault (see Figures 1 and 2) currently is licensed under CX-22 to store about 600 SPERT(F1) fuel pins. To double this storage capacity certain modifications are required as noted below. Consideruon of these mod!fications involves fuel rack strength as well as criticality.

A current maximum of 15 SPERT(F1) fuel pins, each 42" long, are stored in each of 41 open aluminum storage tubes 5" in diameter and 42" in length. An additional aluminum storage tube 5" in diameter and 45" in length has a welded back cover and a bolted and wire-sealed front cover for storage of three demountable fuel pins. This wire-scaled aluminum storage tube is for security of the UC2 fuel pellets in the demountable fuel pins and was requested by the U.S. Nuclea-Regulatory Commission; it appears as the first item in Table 1.

Thirty-nine additional aluminum storage tubes appear as the second item in Table 2. The 80 = 41 + 39 storage tubes can hold 1200 = 80 x 15 SPERT(F1) fuel pins for a total of 1203 fuel pins, subject to strength and criticality considerations. The 81 fuel storage tubes are supported by a Unistrut structure which is bolted to the concrete back, floor, and sides of the 8' x 10' x 8' high Fuel Storage Vault. The bolt fastenings to the sides are a consequence of adding two Unistrut P1000 members (item 3 in Table 1) horizontally (see Figure 2) bolted into the side walls for additional stability. The main Unistrut structure is built up of 8 Unistrut P1000 vertical columns 80" high,18 Unistrut P3300 horizontal beams 120" long, and 36 Unistrut P3301 front-to-back members 25"long. The 81 aluminum storage tubes are fastened to the P3300 members with Unistrut P1122 clamps of which 162 are required, all of which are on hand. Forty of the aluminum storage tubes are wrapped with 15 mil thick cadmium sheets 28" in length and 18" in width, all of which are on hand. The total cost for the storage rack upgrade to double the stored fuel pins is $2430.

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Keith R. Brown August 14,1991

, Page 2 With 15 SPERT(F1) fuel pins stored in ech aluminum storage tube the capacity of the rack is 80 x 15 +3 or 1203 fuel pins, the calculated multip!! cation iactor flooded with water is far b210w 0.95 with or without the cadmium wraps. The static load is 1/20 of the allowable load on each Unistrut column and 1/8 of the allowable load on each Unisttut beam. No additional criticality calculations are required to demonstrate this, because the criticality calculations submitted earlier to the U.S.

NRC were for infinite arrays of storage tubes with and without cadmium wraps.

It is useful to compare the proposed fuel content of the fuel rack with that originally licensed in the 1950's. The origir.el. license assumed 81kg U 235,5.6kg U. -

238,6kg 0, and 760kg stainless steel in about 2900 fuel plates stored in the rack. Each SPERT(F1) fuel pin contains 35.2g U 235 so hi 1203 fuel pins there are 42.3kg U 235 and the pins have a mass of about 1200kg. Thus the proposed mass loading is somewhat larger and the U 235 loading is smaller.

Sincerely, ,

/ . ,,\ ,1 N Dr. Der.a!d " ihtris, Director RPI Reactor (*r. 3 cal 7acility (RCF)

DRitjjd cc R.C. Block J.Schoonbeck i R. Rohr E. Muzzey T. Michaels (USNRC) /

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Table 1. Fuel Vault Components for Enhanced 5(gni,gg

1. One (1) closed storage tube of aluminum with wejded $ 280.00 back cover and bolted front cover with wire-seal fixture. ,

2.* Thirty nine (39) fuel storage tubes of aluminum 42" long by $1700.00 ,

5" outer diameter and about 1/8" wall thickness, cut and deburred.

3. Two (2) Unistrut P1000 members 10' long with bolt fixtures. $ 150.00

4. Installation 5 300.00 -

i Total

$2430.00

' Prices for aluminum are subject to change.

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..' l Figure 1. RPI Reactor Critical Facility (RCF) Showing Reactor Tank (RT), Subtank (ST), Core Water Storage Tank (WST), Reactor Fill Pump (FP), Sump Pump (SP),

Cable Swa chyard (SW) and Trench, Control Room, Control Console, Compuer (Comp), Power Panel (PP), Fuel Storage Vault (W), Fuel Stolage Rack (FSR), Utility i Panel (UP), Piping Pit (PI), Ion Er. change Columns (IE), Shielded Room (SR), Fuel l Rod Counting Apparatus (RCA), and Other Components.

i Figure 2. RCF Fuel Vault Showing Some of the 9 x 9 = 81 Fuel Storage Tubes and Clamps (dimensions in inches).

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