ML19332E407

Errata & Addendum 1 to, Safety Evaluation to Justify Operation W/Loss of Jet Pump Flow Indication for Quad Cities 1 & 2.

ML19332E407
Person / Time
Site:	Quad Cities
Issue date:	10/16/1989
From:	GENERAL ELECTRIC CO.
To:
Shared Package
ML19332E403	List: ML19332E402 ML19332E407
References
EAS-07-0289-ERR, EAS-07-0289-ERR-ADD1, EAS-7-289-ERR, EAS-7-289-ERR-ADD1, NUDOCS 8912070183
Download: ML19332E407 (2)

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QJ Errata andAddenda Sheet e

GE Adleo!(wgr 115 Curtner Aew

+ SonJose. CA 95'25

'^'* ****' E&A No.

Publication No.

T///g- Safety Evaluation to Justify gg[g October 16, 1989 Operation with Loss of Jet Pump j gg7g, gggggg7 gjj ggg gg gf 7pg Flow Indication for Quad Cities 1 & 2 g fjgggjg ggfjgg7jgg gg issue Date " arch 1989 Specifiedbelow.

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5. EFFECT ON ECCS PERFORMANCE ANAL.YSIS  ;

The diffuser upper pressure taps are located at approximately the same elevation as the bottom of the active fuel. To minimize the signal noise and to account for any differences in the velocity distribution at the diffuser entrance, theta are three 0.125 inch diameter holes at the diffuser entrance to measure the static _ pressure in the diffuser. A manifold connects these taps and the ,

instrument line is connected to this manifold inside the vessel. If the jet pump instrument line should break inside the vessel, it would establish an additional leakage path through these taps to the downcomer annulus which would allow water intended for core cooling to leak into the downcomer and delay core [

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reflooding. ,

The design basis loss-of-coolant accident (LOCA) for Quad Cities Units 1 and 2 is a recirculation suction 'line break with a single failure of a DC battery l which disables one Core Spray (CS) System and two of the four Low Pressure ,

coolant injection (LPCI) pumps. An extra High Pressure Coolant Injection (HPCI) l System failure was assumed to facilitate comparison with the battery failure ,

case in the BWR-3/4 generic analysis. In this case, core cooling is accomplished by the one remaining Core Spray System that injects inside the core shroud plus the two remaining LPCI pumps. During reflooding, the leak through  :

the instrument line would' start to occur when the water level reaches the bottom  !

of the active fuel. Leakage would continue as the water level rises to the jet  ;

l pump suction elevation which is at approximately two-thirds of the core height.

D This additional leakage was calculated to be less than 3 gallons per minute through the three 0.125 inch pressure taps in any one diffuser. Even if three diffusers were leaking at this rate, the total flow loss would amount to much L less than 1% of the total ECCS flow available. Previous sensitivity studies  ;

I have shown that a leakage increase of this magnitude has no effect on ECCS performance limits. Consequently, no changes to the current ECCS performance limit calculations are necessary.

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