ML18047A582
| ML18047A582 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 09/20/1982 |
| From: | Johnson B CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8209230237 | |
| Download: ML18047A582 (2) | |
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consumers Power company General Offices: 1945 West Parnall Road, Jackson, Ml 49201 * (517) 788-0550 September 20, 1982 Dennis M Crutchfield, Chief Operating Reactors Branch No 5 Nuclear Reactor Regulation US Nuclear Regulatory Commission Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT - AUXILIARY FEEDWATER SYSTEM MODIFICATION -
ADDITIONAL INFORMATION NRC staff review of Consumers Power Company submittal dated August 11, 1982 and entitled "Auxiliary Feedwater Modification Additional Information",
identified a question regarding what operator actions would be taken in the event there was a break in the common header of the two present Auxiliary Feedwater (AFW) pumps and an active failure of the new AFW (P-8C) pump causing total loss of auxiliary feedwater.
Consumers Power Companys response to this question was verbally given to the NRC staff and is now documented through this submittal.
The response is as follows:
In the present plant procedures, the only procedure that addresses the total loss of auxiliary feedwater situation is in Off-Normal Procedure 21, "Natural Circulation."
In this procedure, Step 20 states that if natural circulation of the primary coolant system cannot be established, then turn on all the high pressure injection pumps and open both PORV's and cool the core by feed and bleed.
The emergency procedures at Palisades will be revised at a future date once the Combustion Engineering Emergency Procedure Guidelines are approved by the NRC.
In Revision 0 of the guidelines, the loss of feedwater guideline describes the action to be taken if,auxiliary feedwater flow cannot be established.
One of the actions, already described above, is to open the PORV and use the HPSI pumps to inject water and cool by a feed and bleed method.
Another action is to use other sources of water for steam generator heat removal and to insert in the procedure the plant specific information.
In the case of Palisades,
DMCrutchfield, Chief Palisades Plant AFW System Modification - Additional Info September 20, 1982 this would be either the diesel driven fire pumps, or if offsite power is available, the condensate pumps.
Both of these require reducing the steam generator pressure by opening the atmospheric dump valves.
This situation has been studied on a "best estimate" basis and shown to be feasible with regard to the capability to remove heat via the atmospheric steam dumps at a reduced steam generator pressure that allows the condensate pumps to produce flow.
Brian D Johnson Staff Licensing Engineer CC Administrator, Region III, USNRC NRC Resident Inspector - Palisades 2