U-602940, Ro:On 980213,alert Emergency Classification Was Declared IAW EPIP EC-02, Emergency Classifications. Caused by Tripped Inverter.Rhr a Was Restored at Approx 0945 H & Emergency Terminated at 1004 H Per EPIP EC-04, Alert

Ro:On 980213,alert Emergency Classification Was Declared IAW EPIP EC-02, Emergency Classifications. Caused by Tripped Inverter.Rhr a Was Restored at Approx 0945 H & Emergency Terminated at 1004 H Per EPIP EC-04, Alert

ML20203B286
Person / Time
Site:	Clinton
Issue date:	02/20/1998
From:	Shawn Smith ILLINOIS POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
U-602940, NUDOCS 9802240250
Download: ML20203B286 (2)

Text

, _ .

i s 9 I I n Pow n Sta a P O Bon 078 Chnton,IL 61727 <

701217 938,8881 .

PGMR u.60294o 8E.100c February 20. 1998 Docket No. 50-461 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20$$$

Subject:

Cliniquf.gwer Station Altrl

Dear Madam or Sir:

Attached please find a summary report of the ALERT event which occurred at Clinton Power Station on February 13,1998. This summary report is being provided as required by the Clinton Power Station Emergency Plan. If you have any questions concerning this summary repon, please contact me.

Sincerely yours, Dennis L. Smith Director-Security and Emergency Planning WLY/ktk Attachment

\

cc: Regkr.al Administrator, Region 111, USNRC l

NRC Clinton Licensing Project Manager NRC Resident Office, V-690 lilinois Depanment of Nuclear Safety

. /

gS 9002240250 990220 1 gDR ADOCK0500g4

.M!R.Oy

1 5^ Attactunent to U 602940 PaSeIof1

'On Friday, February 13,1998, at approximately 0411 hours0.00476 days <br />0.114 hours <br />6.795635e-4 weeks <br />1.563855e-4 months <br />, an Alert emergency classification was declared in accordance with Emergency Plan implementing Procedure (EPIP) EC-02," Emergency Classifications." EC-02 provides guidance for declaring an Alert if conditions exist which may warrant activating additional personnel and/or the Technical Support Center / Operations Support Center (TSC/OSC).

At approximately 0345 hours0.00399 days <br />0.0958 hours <br />5.704365e-4 weeks <br />1.312725e-4 months <br /> on February 13,1998, the Division 11 Nuclear System Protection System (NSPS) inverter tripped. The Division 11 NSPS inverter bypass power supply had been tagged out-of service previously for maintenance. This action resulted in a loss of Division 11 NSPS power causing the Reactor Water Cleanup System (RT) pumps

, "A" and "B" to trip and the Residual llent Removal System (RllR) shutdown cooling suction inboard containment isolation valve. (E12F009) to close. Operator action was subsequently taken to manually trip the RilR pump A, resulting in a loss of shutdown cooling.

The Alert was declared at 0411 hours0.00476 days <br />0.114 hours <br />6.795635e-4 weeks <br />1.563855e-4 months <br /> with the State orillinois and the NRC notified within approved timeframes. The TSC, OSC, and Joint Public Iriformation Center (JPIC) were activated at 0545,0526, and 0527 hours0.0061 days <br />0.146 hours <br />8.713624e-4 weeks <br />2.005235e-4 months <br />, respectively. The Emergency Operations Facility (EOF) and the lleadquarters Support Center (IISC) were also panially activated

, per the CPS Emergency Plan.

During the Alert event, the NRC Resident was present in the TSC. An open communication line was maintained with the NRC Incident Response Center in Rockville, Maryland and the Emergency Response Data System (ERDS) was initiated. Several press releases were issued by the JPIC and one press conference was conducted.

. RT pumps A and B were restarted at approximately 0626. RilR A was restored at approximately 0945 hours0.0109 days <br />0.263 hours <br />0.00156 weeks <br />3.595725e-4 months <br /> and the en,crgency was subsequently terminated at 1004 hours0.0116 days <br />0.279 hours <br />0.00166 weeks <br />3.82022e-4 months <br /> per EPIP EC-04," Alert." The State ofillinois and the NRC were notified of the termination within approved timeframes.

Critiques were conductea within the TSC, OSC, EOF, ilSC, and JPIC facilities immediately following termination of the event. A fact finding was conducted the morning of the 13th and a critique of the event was conducted on February 14,1998.

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