U-601004, Ro:On 870804,notification of Unusual Event Declared Due to Inoperability of Channel 1B21-N697A,LPCS,LPCI & RHR B. Functional Test of Channel Performed & Device,Lpcs & LPCI Declared Operable.Notification of Unusual Event Terminated
| ML20236N393 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 08/05/1987 |
| From: | Spangenberg F ILLINOIS POWER CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| U-601004, NUDOCS 8708110485 | |
| Download: ML20236N393 (2) | |
Text
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U-601006 L30-87 (08-05)-L 1A.120 ILLINO/S POWER OOMPANY CLINTON POWER STATION, P,o. BOX 678 CLINTON, ILLINOIS 61727 10CFR50.47 August 5, 1987 Docket No. 50-461 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C.
20555
Subject:
Clinton Power Station Notification of Unusual Event
Dear Sir:
Please' find attached a summary report of the " Notification of Unusual Event (NOUE)" which occurred at Clinton Power Station on August 4, 1987. This summary report is submitted pursuant to Appendix 1 of NUREG-0654 (Revision 1) and Table 4-1 of the Clinton Power Station Emergency Plan.
If you have any questions concerning this summary report, please contact me.
Sincerely yours, e
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As F. A. Sparkenbe
, III Manager-LicensngandSdfety JDW/ktm Attachment-cc: Regional Administrator, Region III, USNRC W. Snell, Chief Emergency Preparedness Section B. L. Siegel, NRC Clinton Licensing Project Manager NRC Resident Office Illinois Department of Nuclear Safety 8708110485 070005 PDR ADOCK 05000461 S
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Attachmsnt to U-601004 1 of 1 Clinton Power Station Notification of-Unusual Event On'Tues' day, August 4, 1987, at approximately 1642 hours0.019 days <br />0.456 hours <br />0.00271 weeks <br />6.24781e-4 months <br />, a Notification of Unusual Event (NOUE) was declared in accordance with Emergency. Plan Implementing Procedure EC-02, Emergency Classifications.
This procedure requires that a Notification of Unusual Event be declared for a loss of any engineered safety feature requiring plant shutdown by i
the Technical Specifications.
Clinton Power Station (CPS) was operating at approximately 60 percent power in Mode 1.
The plant was operating in accordance with the
. provisions of ACTION statement b under CPS Technical Specification 3.5 1
.due.to the inoperability of Residual Heat Removal subsystem B for scheduled maintenance.
'At'approximately 1625 hours0.0188 days <br />0.451 hours <br />0.00269 weeks <br />6.183125e-4 months <br />, while. performing CPS No. 9001.01, Control Room Surveillance Log, operators found the Division 1, Low Pressure Core' Spray (LPCS), Reactor Pressure Analog Trip Module (ATM)
(1B21-N697A) reading 0 psig while its sister channel was indicating 999 psig.
In accordance with CPS. Technical Specification Table.3.3.3-1, item A.1.c, ACTION 32, the 1B21-N697A channel,-and associated Low Pressure Core Spray (LPCS), and Low Pressure Coolant Injection Subsystem (LPCI) A were declared inoperable.
With.the above declared inoperable,. combined with the inoperability of RHR B for maintenance, Technical Specification ACTION statement d.3 under CPS Technical Specification 3.5.1 required the plant to be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
At approximately 1642 hours0.019 days <br />0.456 hours <br />0.00271 weeks <br />6.24781e-4 months <br />, the Shif t. Supervisor declared a Notification of Unusual ~ Event based on the loss of any engineered safety feature requiring' plant shutdown.by the Technical Specifications. The State of Illinois was notified of the'NOUE at 1657 hours0.0192 days <br />0.46 hours <br />0.00274 weeks <br />6.304885e-4 months <br />.
At approximately 1700 hours0.0197 days <br />0.472 hours <br />0.00281 weeks <br />6.4685e-4 months <br />, after performing satisfactorily a channel functional test of 1B21-N697A, the device was declared operable.
Low Pressure Core Spray (LPCS) and Low Pressure Coolant Injection Subsystem A (LPCI A) were then declared operable. The plant then exited ACTION statement d.3 under Technical Specification 3.5.1.
At approximately 1704 hours0.0197 days <br />0.473 hours <br />0.00282 weeks <br />6.48372e-4 months <br />, the Shift Supervisor terminated the
-Notification of Unusual Event. At approximately~1715 hours, the State of Illinois was notified that the NOUE was terminated. At approximately 1735 hours0.0201 days <br />0.482 hours <br />0.00287 weeks <br />6.601675e-4 months <br />, the NRC Incident Response Center was notified that an NOUE had been declared and that it was terminated.
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