ML20024C770

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Discusses SPR-158 Re Natural Circulation Mode of Operation. Mod to Control Sys to Give Operator Ability to Control Once Through Steam Generator Level in Control Room When Reactor Coolant Pumps Inoperable Not Recommended
ML20024C770
Person / Time
Site: Crane Constellation icon.png
Issue date: 02/07/1974
From: Karrasch B
BABCOCK & WILCOX CO.
To: Pittman R
BABCOCK & WILCOX CO.
References
TASK-*, TASK-GB GPU-0517, GPU-517, NUDOCS 8307130264
Download: ML20024C770 (2)


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setpoist to minimise RCS sooldewa dos to tilling the Of5C's upee "less of vv[.e Q.

acquired to. date at Oconee shove that the level serpoint can be reduced g,'*f

.j An analysis of the astural circulatise, data,

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from 95 on the operate tasse to see flow for decay beat removal and.., '.

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feeduster nessies during the natural circulation, mode.

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We cannot at this' time reesamend a modification to the centrol's.ystem te

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give the operator ability to control OTSC.levet its.the control room when

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and we feel. that it.is not necessary.

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less of mais feedwater (as"it should) the c'oeldews, transient v11'1 be greatly

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If the operator sees excessive.coeldown occurring, he cam step

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We recommead.the following action bd tahea on Contracts. 3 through 13 to I

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,,.,1.. Reduce, necural circulation level setpoint to 50: es t'he operate range-

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Prior to reaching.401 power in t$e Power Escalacion Sequence, the.

. resironse time of the Emertency Feedvster Sescas should ba verified _

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unique system capabilities should be checkad out for this occurrence

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instead of normal.e1~ectrical. supplies..and that all* proper alectrical '

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