U-600928, Ro:On 870506,reactor Manually Scrammed When Reactor Pressure Vessel Level Began to Rise.Caused by Failure of Feedwater Valve Controlling Flow of Water to Reactor to Open.Reactor Shut Down.State of Il & NRC Response Ctr Notified

Ro:On 870506,reactor Manually Scrammed When Reactor Pressure Vessel Level Began to Rise.Caused by Failure of Feedwater Valve Controlling Flow of Water to Reactor to Open.Reactor Shut Down.State of Il & NRC Response Ctr Notified

ML20215J594
Person / Time
Site:	Clinton
Issue date:	05/06/1987
From:	Spangenberg F ILLINOIS POWER CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
U-600928, NUDOCS 8705080119
Download: ML20215J594 (2)

Text

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4 - m l'-600928 L30-87 (05-06)-L lA.120 ILLINDIS POWER COMPANY IP CLit.T A eOwf

• iTA?$N P.G 901 era. (: 'Nf 0N ttt . Nots 61/27 10CFR50.47 May 6, 1987 Docket No. 50-461 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555

Subject:

Clinton Power Station Notification of Unusoal Event Dear Sir Please find attached a summary report, of the "Nr.tification of Unusual Event (NOUE)" which occurred at Clinte,n Power Station on May 6, 1987. This summiary report is submitted pursuant to Appendix 1 of NUREC-0654 (Revision 1) and Table 4-1 of the Clinton Power Station Emergency Plan. If you have any questions ecacerning this summary report, please contact me.

Sincerely yours,

. O F. A. Spangen rg Manzger - Licensing and Safety PJT/ckc

- Attachment cc; Regional Administrator, Region III, aSNFC

51. Snell, Chief Emergency Preparedntae Section B. I,. Siege * , NRC Clinton Licenning Ptaject Manager NRC Resident Office Illinois Department of Nuclear Safety t

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Attachment to U- 600928 j i of I l l

Citnton Power Station Notification of Unueual Event i

on Wednesday, May 6, 1987, at apprcximately 0617, tne reactor was manually scrammed when a feedwatet valve which controls the flow of water to the reactor failed opea, and reactor pressure vessel level began to rise. A Notification of Unusuni Event (NOUE) was declared as required by Emergency Plan Implementing Procedure (EC-02), " Emergency Clasnifications." This procedure requires that a Notification of Unusual Event be de:lared for conditions which involve other than normal controlled shutdown. A description of the event is as follows:

At 0603 hours0.00698 days <br />0.168 hours <br />9.970238e-4 weeks <br />2.294415e-4 months <br /> an operator found the hydraulic unit for the  ;

feedwater flow regulating valve flFR004) leaking hydraulic oil.

This valve is on the discharge line of the Motor Driven Feed Pump and controls feedwater flow to the reacter pressure vessel (RPV).

At 0617 hours0.00714 days <br />0.171 hours <br />0.00102 weeks <br />2.347685e-4 months <br />, IFWOO4 failed as in in the open position. Water level in the RPV began to rise. The main control room reactor {

operator manually scrammed the reactor before the high water level scram setpoint was reached.

[ At 0627 hours0.00726 days <br />0.174 hours <br />0.00104 weeks <br />2.385735e-4 months <br />, with the renctor shutdown, a Notification of Ununual Event van declared. The State of Illieris was notified of the NOME at 0628 hours0.00727 days <br />0.174 hours <br />0.00104 weeks <br />2.38954e-4 months <br />, and the Nuclear Regulatory Commission Incident Response Center was notified at 0655 hours0.00758 days <br />0.182 hours <br />0.00108 weeks <br />2.492275e-4 months <br />. At 0705 hours0.00816 days <br />0.196 hours <br />0.00117 weeks <br />2.682525e-4 months <br />, after the reactor was shutdown and in a stable condition, the NOUE was terminated, and the State of Illinois ano the Nuclear Regulatory a Commission Incident Renponse Center were notified.

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L30-87 (05-06)-L i IA.120 l ILLIN018 POWER 00MPANY cw,ia , ov s zie cN P.o ecs e18. M 'NION IU . nom 61S 10CFR50.47 May 6. 1987 Docket No. 50-461 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555 Subj ect: Clinton Power Station Notification of Unusoal Event

Dear Sir:

Please find attached a suusnary report. of the " Notification of Unusual Event (NOUE)" which occurred at Clintsn Power Station on May 6, 1987. This summary report is submitted pursuant to Appendix 1 of NUREC-0654 (Revision 1) and Table 4-1 of the Clinton Power Station Emergency Plan. If you have any questions ccacerning thin summary report, please contact me.

Sincerely yours,

. O F. A. Springen rg Mana ar - Licensing and Safety PJT/cke Attachment cct Regional Administrator, Regior. III , M W. Snell, Chief Emergency Preparada e action B. I,. Siegel, NRC Clinton Licensiv, Project Manager NRC Resident Office Illinois Department of Nuclear Safety t

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, Attccha:nt to U- 600928 I of 1 Citnton Power Station Notification of Unucua! Event On Wednesday, May 6, 1987, at apprcximately 0617, tne reactor was manually scrammed when a feedwater valve which controls the flow of water to the reactor failed open, and reactor pressure vessel level ,

began to rise. A Notification of Unusual Event (NOUE) was declared as required by Emergency Plan Implementing Procedure-(EC-02), " Emergency Classifications." This procedure requires that a Notification of Unusual Event be de:lared for conditions which involve other than normal controlled shutdown. A description of the event is as follows:

At 0603 hours0.00698 days <br />0.168 hours <br />9.970238e-4 weeks <br />2.294415e-4 months <br /> an operator found the hydraulic unit for the feedwater flow regulating valve (IFWOO4) leaking hydraulic oil.

This valve is on the discharge line of the Motor Driven Feed Pump and controls feedwater flow to the react:r pressure vessel (RPV).

At 0617 hours0.00714 days <br />0.171 hours <br />0.00102 weeks <br />2.347685e-4 months <br />, IFWOO4 failed as is in the open position. Water level in the RPV began to rise. The main control room reactor operator manually scrammed the reactor before the high water level scram setpoint was reached.

At 0627 hours0.00726 days <br />0.174 hours <br />0.00104 weeks <br />2.385735e-4 months <br />, with the reactor shutdown, a Notification of Ununual Event was declared. The State of Illir.cis was notified of the nolle at 0628 hours0.00727 days <br />0.174 hours <br />0.00104 weeks <br />2.38954e-4 months <br />, and the Nuclear Regulatory Commission Incident Response Center was notified at 0655 hours0.00758 days <br />0.182 hours <br />0.00108 weeks <br />2.492275e-4 months <br />. At 0705 hours0.00816 days <br />0.196 hours <br />0.00117 weeks <br />2.682525e-4 months <br />, af ter the reactor was shutdown and in a stable condition, the NOUE was terminated, and the State of 11]inoin and the Nuclear Regulatory Commission Incident Renponse Center were notified.

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