View source for U-601991, Ro:On 920522,discovered That External Vessel Surface Was Hot & Chart Recorder Indicated Absorber Bed Temp Greater than 300F.Fire Brigade Was Activated.Sampling Process Established to Monitor Purge Exhaust Composition

{{Adams
| number = ML20101B798
| issue date = 06/01/1992
| title = Ro:On 920522,discovered That External Vessel Surface Was Hot & Chart Recorder Indicated Absorber Bed Temp Greater than 300F.Fire Brigade Was Activated.Sampling Process Established to Monitor Purge Exhaust Composition
| author name = Spangenberg F
| author affiliation = ILLINOIS POWER CO.
| addressee name = 
| addressee affiliation = NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
| docket = 05000461
| license number = 
| contact person = 
| document report number = U-601991, NUDOCS 9206050155
| document type = REPORTABLE OCCURRENCE REPORT (SEE ALSO AO LER), TEXT-SAFETY REPORT
| page count = 2
}}

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Hiincas Puer Company
                       ,                                                                                                                             Gknten Power Stahon P O. Box 678 Chr: ton, il 61727 Tel 217 935 S891 U-601991 PteM R                                                                                                        tP640-92 < 06-01)tP 1N4150 June 1,        1992 U. S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555 Subj ect:              Clinton Power Sj;ation Notification of Unususi Event

==Dear Sir:==

Please find attached a summary report of the Notification of Unusual Event'(NOUE) which occurred at the Clintan Power Station on May 22,. 1992. This summary report is submitted pursuant to Appendix 1 of NUREG-0654 (Revision 1) and Clinton Power Station Emergency Plan Implementing Procedure, AP-03, "EMERCENCY RECORDS RETENTION". If there are any questions concerning this summary report, please contact me at (217).935-8881, extension 3400.
Sincerely yours,
                                                                                                            /                   pm>                                  ,'
: q.       .c F. A. Spangpnbe                    g, III Manager - Licensing and Safety MWL/mjb Attachment cc:      Regional Administrator, Region II1, USNRC J. McCormick - Barger Chief Emergency _ Preparedness Section NRC Clinton Licensing Project Manager NRC Resident Office Illinois Department of Nuclear Safety
                                               . ; r a r. r - .
OvuVa 4 9206050155 920601
                                                                                                                                                                     $6a PDR      ADOCK 05000461 PDR S

CLINTON POWER STATION                                    f l
NOTIFICATION OF UNUSUAL EVENT                                 1 I
i On Friday, May 22,-1992, at 0802 hours, a Notification of Unusual Event (NOUE) 1s declared in accordance with Emergency Plan Implementing Procedure EC 02, El:ERCENCY CIASSIFICATIONS. Thia procedure requires a NOUE be declared if a fire within the_ plant occurs and lasts for more than 10 minutes.
Clinton Power Station was shutdown at 0% power in a Refueling Outage in Mode 4 when the fire occurred.
At approximately 0700 hours on May 22, 1992, a licensed Reactor Operator noted unusual offgas charcoal adsorber bed temperatures while performing a routine walkdorn of control room panels.       Af ter monitoring charcoal adsorber bed temperatures, plant operators placed the beds in the " bypass" mode in response to a possible charcoal fire. -The NOUE was declared based on local confirmation that the external vessel surface was hot and that the chart recorder indicated the adsorber bed temperature was greater than 300*F, At 0811 hours the     're Erigade was activated; at 0852 hours, nitrogen (N 2 )
flow to the charcsat beds was established using portable bottles in accordance with site operating procedures The State of Illinois was notified of the NOUE at 0814 hours on Friday, May 22, 1992, and the Nuclear Regulatory Commission (NRC) Incident Response Center was notified at 0826 hours. The NRC Resident Inspector was notified at 0827.
IP developed criteria for determining when the fire could be considered extinguished,    These criteria required a concentration of less then 10 ppm
         - carbon monoxide (CO) wi', no indication-of an increasing trend, steady or l         decreasing vessel and charcoal temperatures, and carbon dioxide         9 2) levels      ,
!         less than one percent. A sampling-process was established to monitor the purge exhaust composition at the exit of the charcoal adsorber beds. These criteria were met, and the Notification of Unusual Event was terminated at 1850 hours on Saturday, May 23, 1992.
The State of Illinois was notified of termination of the NOUE at 1855 hours on Satueday, May 23, 1992, and the Nuclear Regulatory Commission (NRC) Incident
* Response Center was notified of the termination at 1918 hours.        The NRC Resident Inspector was also notified.
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