ML20024B267
| ML20024B267 | |
| Person / Time | |
|---|---|
| Site: | Oconee, Crane  |
| Issue date: | 02/07/1974 |
| From: | Karrasch B BABCOCK & WILCOX CO. |
| To: | Pittman R BABCOCK & WILCOX CO. |
| References | |
| TASK-03, TASK-06, TASK-11, TASK-3, TASK-6, TASK-GB GPU-2404, NUDOCS 8307080141 | |
| Download: ML20024B267 (2) | |
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s 571158 '*4tural Circulation Mode of Operation.
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The subject SPR recor== ended a reduction in the Natural Circulation Level setpoint to minimize RCS cooldown due to filling the OTSG's upon loss of 3/ f ~ '
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all teactor Coolant Pu ps.
An analysis of the natural circulation data -
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acquired to date at Oconee shows that the level setpoint can be reduced
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more than adequate natural circulation flow for decay heat renoval and, k f r >N"1
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cooldown. Feeding of the OTSC's should remain through the auxiliary
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We n-t at this time recon =end a modification to the control system to Ti. i 'i.*.c - Wi.-.,
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give the operator ability to control CISG 1evel in the control room when and we feel that it is not necessary. If the level setpoint is changed to
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no'RC pumps are operating. This change would be e.ost difficult to implement 7.
50% and if the auxiliary feedvater reaches the OTSC within one minute of tha
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.._-@,! 9' j. pM'.d loss of main feedvater, (as it should) the cooldown transient will be greatly.- ST.
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.a minimized. If the operator sees excessive cooldown occurring, he can stop and start the emergency feedpump from the control room.-
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. fg1 We recommend the following action be taken on Contracts 3 through 13 to -
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7f prevent the excessive cooldown that Cconee II experienced during the loss
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- 1. ' Reduce natural circulatiou level setpoint to 50% on the operate range.
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Prior to reaching 40 power in the Power Escalation Sequence, the E 'p.
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response cine of the Emergency Teedvater System should be verified-during a st=ulated loss of station oower. That is, each customer's 5.(.
$J unique system capabilities should be checked out for this occurrence;
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such things as instrument air pressure loss, effect of using auxiliary l.?
instead of normal electrical supplies, and that all proper electrical i. '~
7 transfers are made should be investigated. Merely lining up all valvee and starting the Energency Teedvater Pump is not an adequate checkout Q L.
of the system for a loss of station power.
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PDR ADOCK 05000289
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Please forward this information to the respective sites and incorporate the G..a
. level setpoint change on Contracts 3-13.
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