ML20197B886
| ML20197B886 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 03/03/1998 |
| From: | Barrett R NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD) |
| To: | Bernard Thomas INTERNATIONAL ATOMIC ENERGY AGENCY |
| References | |
| NUDOCS 9803120308 | |
| Download: ML20197B886 (3) | |
Text
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March 3. 1998 s
Mr. Bemard Thom:s 03yig {
INES Coori'nator 23 S
Division cf Ns lear Safety -
Intemational Atomic Energy Agency Wagramerstrasse 5 P.O. 30x 100 A 1400 Vienna Austria I
Dear Mr. Thomas:
Enclosed is a completed Event Rating Form for an event at the Clinton Power Station, Un!t 1. The event involved a loss of shutdown cooling to the reactor vessel while the unit was in an extended outage. This event is considered level 0/below scale based on Part lll 3.1.1 of the INES User's Manual.
Sincerely, Ell ha!0!gr.cf Dy:
B Richard J. Barrett, Deputy Director l
Incident Response Division Office for Analysis and Evaluation l
of Operational Data l
Enclosures:
- 1. INES Rating Form
- 2. Press release Qltttribution:
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s THE INTERNATIONAL NUCLEAR EVENT SCALE (INES)
EVENT RATING FORM (ERF)
,o ot,<,o To THE m,.. co tor,7 g..,jg, IAEA WAORAMIR8TRAi$t d P O DOE 100. A 1430 VitNNA AultRIA e tJAAIL THQlAASONtPoi wtAORAT LOSS OF SHUTDOWN COOLING EVENT DATE E
13.02.98 RATING E'"
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COUNTRY USA FACILITY CLINTON POWER STATION UNIT 1 FACILITY BWR NAME TYPE ASPECTS OF SIGNIFICANCE l0 THE PUBLIC:
YES NO ACCIDENT O INCIDENT O DEVIATION E RADIOACTIVE RELEASES OFF SITE O
E RADIOACTIVE RELEASES ON SITc O
E WORKERS INJURED BY RADIATION O
E WORKERS INJURED PHYSICALLY O
E PLANT SAFETY IS UNDER CONTROL E
D THE EVENT REPORTED IS A DISCOVERY OF A DEFICIENCY BY ROUTINE SURVEILLANCE D
E A PRESS RELEASE WAS MADE E
D (IF YES, PLEASE ATTACH IT)
SIIORT !)ESCRIPTION OF Tile EVENT: On 13 February 1998, shutdown cooling of the reactor vessel was lost for several hours when suction isolation valves for the residual heat removal (RliR) system automatically closed. These valves closed due to the loss of the primary power supply to Division 2 of the Nuclear Safety Protection System, while the alternate pcwer supply was unavailable because of maintenance. The unit had beert shut down since 5 September 1996, and decay heat loads were relatively low. During the period that the shutcown aoling system was unavailable, water in the reactor vessel began to heat up at a rate of approximately 0.6*F per hour. The licensee declared an ALER T Emergency Classification at the discretion of the control Nom supervisor, who desired to bring additional personnel onsite to assist in restori..g the RHR system. The RHR system was restarted approximately six hours afler the initial event.
JUSTIFICATION OF TIIE RATING: This event is rated at level 0/below scale in accordance I
with Part 1113.1.1 of the INES Users Manual as a minor change in coolant temperature due to some degradation of cooling with a comparable large time available for corrective actions.
CONTACT NAMF Reer. sed J Benett 88 ADORE SS USNRC WanNngton DC 20665 PHONE (30164164 482 mow %
FAX (301) 816-5161 PLEASE ATTACH AD0ffiONAL INFORMATION ON JUSTIFICATION OF THE EVENT RATING AND DIFFICULTitS ENCOUNTERED,(F N2fDED e
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JtB-13-SBFRi09:30AM ILPOWERJP102 FAX NO. 2174246933 P. 01 News Release 5 '/f()
l For immediate release:
Feb. 13, 1998 For more information Illinois Power (217) 424-6400
- tb aL 71 f Sh m Alert Deci. dred At 4 :11 a.m. on Friday, Feb.1:1, 'llinois Power Company declared an " Alert" at the Clir.'.,a Power Station, located about six miles east of Clinton, Illinois.
The Alert c3assification was declared as a precautionary measure to provide support for the restoration of systems used to cool the reactor when.one of the shutdown cooling systems was lost due to an equipment fault.
Actions were promptly taken to re-establish cooling and by J
6:30 a.m.,
an alternate cooling system was put in service.
During the loss of the cooling systems, there was no increase in temperature of the reactor coolant. At no time was the health and safety of the pub'ic jeopardized during the Alert.
Activation of the onsite Technical Support Ce;.
.e and operations Support Center were initiated and company personnel staffed support positions. Appropriate Federal, State, and local authorities were notified.
An Alert'is the second least serious of four emergency classifications.
Emergency conditions at a nuclear power plant are classified 1..
one of four categories.
These are Notification of Unusual Event, Alert, Site Area Emergency, and General Emergency.
The Clinton Power Station is a General Electric boiling water reactor which produces 95t,000 kilowatts of electricity.
The Clinton Power Station is operated by Illinois Power..
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