ML20211C518
| ML20211C518 | |
| Person / Time | |
|---|---|
| Site: | 07001113 |
| Issue date: | 09/18/1997 |
| From: | Reda R GENERAL ELECTRIC CO. |
| To: | Hrabal C NRC |
| Shared Package | |
| ML20046D816 | List: |
| References | |
| NUDOCS 9709260229 | |
| Download: ML20211C518 (2) | |
Text
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GE NUCLEAR ENERGY GE Nuclear Energy Production WILMINGTON, NORTH CAROLINA i
To: Craig Hrabal Company:
NRC Phone:
Fax:
301-415-5955 From:
Ralph Reda Phona:
910-675-5889 l
Fax:
-5879 1
Date:
September 18,1997 Pages including this 5
cover page:
Craig:
Attached is a timeline, a process diagram, and a proposed change to Table 9 our license to facilitate our teleconference regarding the investigation of the 9/4/97 reportable event. The process diagram contains GE proprietary information, and we request that it be returned to GE or destroyed after use.
If you have any questions or concerns please call me at 910-675-5889 or page me at 910-371-8072.
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DCP Event Timeline 8/2S/97 Noted ero flow at line #1 UF6 injector nozzle Postulated plugged nozzle.
8/29/97 Confirmed plugged nozzle Attempted to use N2 flows to clear nozzle Clearms attempts unsuccessful - Line #1 shut down 9/2/97 System was disassembled Plugged noz:10 line removed 9/3/97 New UF6 injector nozzle mstalled 1200 hrs Routine stack sample: Below Action Level:
1730 Start-up sequence i.,itiatet Introduction of N2, System Heat-up, Heat tracing tumeden.
9/4/97 1215 Rad. Tech. changing routme stack sample noticed d2scolored filter paper -immediately began measurement.
1243 Process Steam applied to the system. (UF6 still isolated) 1246 Line 41 Pipe detector tripped on high U-235 - Operation Halted 1321 Steam Shut Off 1430 Prelimmary Stack Results above Intemal Action Lesels 1440 Site Emergency Organization Assembled - declared unusual event 1610 DCP Cold-shutdown sequence inrtiated 1610 Stack sampling freq. Increased to once per 8 hrs 1630 Courtesy notifications made to NRC, State, Local Agencies 9/5/97 0856 Report made to NRC under 10CFR70.50 Root Caw : Investigation Team Chartered DCP Lines I and 2 in cold shutdown 9/10/97 Developed and Initiated Cleanout Recovery Plan 9/17/97 Root Causes and Corrective Actions Identified
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