ML19318C137
| ML19318C137 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Byron, Braidwood, Quad Cities, Zion, LaSalle  |
| Issue date: | 05/29/1980 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Reed C COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8007010086 | |
| Download: ML19318C137 (1) | |
Text
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'o UNITED STATES flC
- *,,g NUCLEAR REGULATORY COMMISSION
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799 ROOSEVELT ROAD Q
GLEN ELLYN, ILLINOls 60137
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o blay 2 9 95 Docket Nos. 50-10, 50-237, 50-249, 50-254, 50-265, 50-295, 50-304, 50-373, 50-374, 50-454, 50-455, 50-456 and 50-457 Commonwealth Edison Company ATTN:
Mr. Cordell Reed Vice President Post Office Box 767 Chicago, IL 60690 Gentlemen:
This Information Notice is forwarded for information. No written re-sponse to this Information Notice is required.
If you have any questions related to this matter, please contact this office.
Sincerely, ws d
/ ames G. Kepp er Director
Enclosure:
IE Information Notice No. 80-23 cc w/ encl:
Mr. D. L. Peoples, Director Mr. Gunner Sorensen, Site of Nuclear Licensing Project Superintendent Mr. B. B. Stephenson, Mr. R. Cosaro, Project Station Superintendent Superintendent Mr. N. Kalivianakis, Central Files Station Superintendent Director, NRR/DPM Mr. N. Wandke, Station Director, NRR/ DOR Superintendent PDR Mr. L. J. Burke, Site Local PDR Project Superintendent NSIC Mr. T. E. Quaka, Quality TIC Assurance Supervisor Mr. Dean Hansell, Office Mr. R. H. Holyoak, Station of Assistant Attorney General Superintendent Myron M. Cherry, Chicago 8007010pg g
f UNITED STATES SSINS No.:
6835 NUCLEAR REGULATORY COMMISSION Accession No.:
OFFICE OF INSPECTION AND ENFORCEMENT 8005050061 WASHINGTON, D. C.
20555
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c2 May 29, 1980 IE Information Notice No. 80-23 LOSS OF SUCTION TO EMERGENCY FEEDWATER PUMPS Description of Circumstances:
On April 7,1980, Arkansas Nuclear One, Unit 2, suffered a loss of offsite povar due to tornado damage to 500 kv transmission towers.
The unit tripped from 98%
power; the diesel generators started and supplied vital loads; natural circula-tion in the reactor coolant system wcs established; and the emergency feedwater (EFW) pumps supplied feedwater to the steam generators.
The suction of the EFW pumps was aligned to the Condensate Storage Tanks (CST) and to the Startup and Blowdown Demineralizer effluent in parallel.
Approxi-mately 15 minutes after the unit tripped, both EFW pumps lost suction.
Prompt operator action was taken to isolate the EFW pump suction from the Startup and Blowdown Demineralizer and to vent the EFW pumps.
EFW flow was re-established within one minute.
Investigation revealed that the EFW pump suction loss was caused by flashing in the main feedwater train forcing hot water through the Startup and Blowdown Demineralizers to the EFW pump suction where it flashed to steam.
The steam caused cavitation of the EFW pumps, and the pressure in the EFW suction header prevented flow from the CST.
The licensee has submitted Licensee Event Report No. 50-368/80-18/03L-0, dated May 5, 1980, describing this event.
Action to prevent recurrence included revising the EFW system operating procedure and the Plant Startup Procedure to require shutting the EFW suction valve from the Startup and Blowdown Demineralizers during plant startup at about 5% full power after the steam generator feedwater source has been shifted to a main feedwater pump.
In addition, the EFW suction valve from the Startup and Blewdown Demineralizers will be verified closed once per shift during Mode 1 operation.
This IE Information Notice is provided as an early notification of a possibly significant matter that is still under review by the NRC staff.
It is expected that recipients will review the information for possible applicability to their facilities.
No specific action or response is requested at this time.
If NRC evaluations so indicate, further licensee actions may be requeste or required.
No written response to this IE Information Notice is required.
If you have l
any questions regarding this matter, please contact the Director of the 1
appropriate NRC Regional Office.
l 1
i 15InformationNoticeNo.80-23 Enclosure
' 's l
May 29, 1980 RECENTLY ISSUED IF INFORMATION NOTICES Information Subject Date Issued To Notice No.
Issued 80-22 8reakdown In Contamination 5/28/80 All power reactor Conttol Programs OLs and near term cps 80-21 Anchorage and Support of 5/16/80 All power reactor Safety-Related Electrical facilities with an Equipment OL or CP 80-20 Loss of Decay Heat Removal 5/8/80 All light water reactor Capability at Davis-Besse facilities holding Unit 1 While in a Refueling power reactor OLs or cps Mode 80-19 NIOSH Recall of Recircu-5/6/80 All holders of a power lating-Mode (Closed-Circuit) reactor OL, Research Self-Contained Breathing Reactor License, Fuel Apparatus (Rebreathers)
Cycle Facility License and Priority I Material License 80-18 Possible Weapons Smuggling 5/5/80 A,'l power reactor Pouch fa.-ilities with an OL, fuel fabrication and processing facilities and Materials Priority I licensees (processors and distributors) 80-17 Potential Hazards Associated 5/5/80 All radiography With Interchangable Parts Licenses On Radiographic Equipment 80-16 Shaft Seal Packing 4/29/80 All power reactor Causes Binding In Main facilities in y7ar Steam Swing Check And Region with an CL or CP Isolation Valves 80-15 Axial (Longitudinal) 4/21/80 All Light Water Reactor Oriented Cracking In Facilities holding power Piping reactor OLs or cps