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

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

ML20101B798
Person / Time
Site:	Clinton
Issue date:	06/01/1992
From:	Spangenberg F ILLINOIS POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
U-601991, NUDOCS 9206050155
Download: ML20101B798 (2)

Text

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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

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OvuVa 4 9206050155 920601

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CLINTON POWER STATION f l

NOTIFICATION OF UNUSUAL EVENT 1 I

i On Friday, May 22,-1992, at 0802 hours0.00928 days <br />0.223 hours <br />0.00133 weeks <br />3.05161e-4 months <br />, 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 hours0.0081 days <br />0.194 hours <br />0.00116 weeks <br />2.6635e-4 months <br /> 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 hours0.00939 days <br />0.225 hours <br />0.00134 weeks <br />3.085855e-4 months <br /> the 're Erigade was activated; at 0852 hours0.00986 days <br />0.237 hours <br />0.00141 weeks <br />3.24186e-4 months <br />, 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 hours0.00942 days <br />0.226 hours <br />0.00135 weeks <br />3.09727e-4 months <br /> on Friday, May 22, 1992, and the Nuclear Regulatory Commission (NRC) Incident Response Center was notified at 0826 hours0.00956 days <br />0.229 hours <br />0.00137 weeks <br />3.14293e-4 months <br />. 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 hours0.0214 days <br />0.514 hours <br />0.00306 weeks <br />7.03925e-4 months <br /> on Saturday, May 23, 1992.

The State of Illinois was notified of termination of the NOUE at 1855 hours0.0215 days <br />0.515 hours <br />0.00307 weeks <br />7.058275e-4 months <br /> on Satueday, May 23, 1992, and the Nuclear Regulatory Commission (NRC) Incident

• Response Center was notified of the termination at 1918 hours0.0222 days <br />0.533 hours <br />0.00317 weeks <br />7.29799e-4 months <br />. The NRC Resident Inspector was also notified.

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