ML20054E161

Corrected Page III-7 to Spent Fuel Pool Mod, Amend 3

ML20054E161
Person / Time
Site:	Farley
Issue date:	04/30/1982
From:	ALABAMA POWER CO.
To:
Shared Package
ML20054E158	List: ML20054E157 ML20054E161
References
NUDOCS 8204260203
Download: ML20054E161 (1)

Text

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to the spent fuel pool 10 days after the emergency shutdown.

3. 1C5'E component cooling water temperature.

Results:

No. of Total Spent Fuel Cooling Trains Heat Load Pool Bulk Operation (108 Bru/hr) Temperature (*F)

1 30.384 158 2 30.384 131 i The computer code BPCOL is'used to analyze the natural l circulation cooling of the spent fuel in the event of a loss of all external means of cooling for the spent fuel pool. BPCOL is a proprietary program of NAI. The code is based on the assumption that boiling takes place near the top of the fuel channel. BPOOL evaluates the saturation properties of the

, coolant on the basis of the static pressure at the top of the storage racks. These properties include water density, temperature, and steam density.- The steam is assumed to separate and flow out of the pool. 13ut water at the saturation j temperature corresponding to the pressure at the top of the racks flows downward to the inlet of the storage racks. The' static pressure at this location is higher than the pressure at the top of the storage racks and as a result the fluid is subcooled as it enters the fuel assembly. The fluid becomes less dense as it passes up the fuel channel. Near the top of I the fuel channel the fluid reaches saturation conditions and net boiling occurs. The computer code, BPOOL, assumes a loss of all external means of cooling, but it should be noted that the Farley spent fuel pool cooling system is redundant and single failure-proof.

Under normal conditions, voiding between fuel assemblies is highly unlikely because these spaces are not sealed to keep out water.

l Holes are provided at the top and bottom of each inner can to permit a definitive flowpath for circulation of water in these spaces.

III.l.5.(4) Potential Fuel and Rack Handling Accidents l The high-density poison racks are of a free-standing design, l utilizing bottom support pads, resting on the flocr of the spent fuel pool. The installation of the high-density racks will include removal of the existing 13-in. center storage i

racks. The high-density racks will be installed dry' since E l there is no fuel in the storage pool. l l The following is a sequence of events for installing the high-density poison racks.

Phase I Install and test a temporary crane for handling the existing racks and the high-density racks. The 8204260 g III-7 AMEND 3 4/82 Corrected page

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