View source for PNO-III-87-076, on 870524,reactor Scrammed When Feedwater Regulating Valve Failed in Open Position Resulting in Automatic Scramming of Aprm.Licensee Will Investigate Cause of Valve Failure & to Perform Maint Activities

{{Adams
| number = ML20214L613
| issue date = 05/26/1987
| title = PNO-III-87-076:on 870524,reactor Scrammed When Feedwater Regulating Valve Failed in Open Position Resulting in Automatic Scramming of Aprm.Licensee Will Investigate Cause of Valve Failure & to Perform Maint Activities
| author name = Forney W, Knop R
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION III)
| addressee name = 
| addressee affiliation = 
| docket = 05000461
| license number = 
| contact person = 
| document report number = PNO-III-87-076, PNO-III-87-76, NUDOCS 8706010026
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION &amp; AUDIT &amp; I&amp;E CIRCULARS
| page count = 1
}}
{{#Wiki_filter:PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-III-87-76 Date May 26, 1987 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without v;rification or evaluation, and is basically all that is known by the Region III staff on this date.
Facility:   Illinois Power Company                  Licensee Emergency Classification:
Clinton Unit 1                            X Notification of an Unusual Event Clinton, IL 61727                            Alert Site Area Emergency Docket No. 50-461                            General Emergency Not Applicable

==Subject:==
AUTOMATIC SCRAM DUE TO FEEDWATER VALVE FAILURE At 6:15 p.m. (CDT), May 24, 1987, the reactor scrammed from 18 percent power when a fe:dwater regulating valve failed in the open position, increasing the flow of water to the reactor. The increased flow increased the neutron flux, resulting in the Average Power Rang 2 Monitor automatically scranning the reactor when the flux level reached the indicated setpoint.
The licensee plans to remain shutdown to investigate the cause of the valve failure and to perform scheduled maintenance activities.
This event was similar to a manual reactor scram on May 6, 1987, when the same feedwater regulating valve malfunctioned.
Region III (Chicago) is monitoring the licensee's course of action.
The State of Illinois will be notified.
I The NRC Operations Center was notified of this event at 7:13 p.m. (CDT), May 24, 1987. This information is current as of 11:30 a.m. (CDT), May 26, 1987.
CONTACT:    R. K o                      ne FTS 388-5547          FTS 388-5590 8706010026 870526 PDR   I&E PNO-III-87-076 PDR DISTRIBUTTON:
H. St.                      ED0        NRR       E/W         Willste      Mail: ADM:DMB Chairman Zech               PA                    IE         NMSS                 D0T:Trans only Comm. Roberts               ELD                  OIA         RES Comm. Asselstine                                 AE0D                     NRC Ops Ctr M.70 Conn. Bernthal Comm. Carr                  SP /.'t/h       Regional Offices ACRS SECY                        INP0/.*M             NSAC / M RIII Resident Officg
                                                            ~
CA PDR                         Licensee:      J.'/4,        (Corp. Office - Reactor Lic. Only)
Region III Rev. November 1986 Y/ :W3f}}

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