View source for PNO-IV-88-013A, on 880221,reactor Scram Occurred During Shell Warming of Main Turbine.Caution Added in Turbine Startup Procedure Re Possibility of Reactor Scram Because of Turbine First Stop Pressure During Shell Warming

{{Adams
| number = ML20196E102
| issue date = 02/22/1988
| title = PNO-IV-88-013A:on 880221,reactor Scram Occurred During Shell Warming of Main Turbine.Caution Added in Turbine Startup Procedure Re Possibility of Reactor Scram Because of Turbine First Stop Pressure During Shell Warming
| author name = Holler E
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION IV)
| addressee name = 
| addressee affiliation = 
| docket = 05000458
| license number = 
| contact person = 
| document report number = PNO-IV-88-013A, PNO-IV-88-13A, NUDOCS 8802290017
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION &amp; AUDIT &amp; I&amp;E CIRCULARS
| page count = 2
}}
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    -dx a February 22,_1988 PRELIMINARY NOTIFICATION 0F EVENT OR UNUSUAL OCCURRENCE -- PN0-IV-88-13A
                                                      ~
     - This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received
     'without verification or evaluation, and is. basically all that is known by the Region IV staff on this date.
FACILITY:                                           Licensee Emergency Classification:
Gulf States Utilities                                       Notification of Unusual Event-River Bend Station                                  ~'- Al e rt St. Francisville, Louisiana:                               Site Area' Emergency General Emergency DN: 50-458 X     Not Applicable

==SUBJECT:==
SHUTDOWN IN EXC iSS OF 48 HOURS This PN updates PN0-IV-88-13, issued on' February 19, 1988.
The licensee entered an anticipated 7-day outage on February 19,-1988, to investigate and repair the ' A' reactor recirculation pump motor which had tripped on an over-current condition while the plant was at 100% power. The licensee determined that moisture in the pump motor cable conduit was the~. source of tb ground to the pump' motor. After effecting repairs to the electrical terminations on the 'A' reactor recirculation pump motor and other unrelated maintenance, the license comenced a reactor startup.
On February 21,1988, at 10:26 p.m. (CST) with the reactor at 4 percent power, a reacto.' scram occurred during shell warming of the main turbine. The licensee allowed turbine first stage pressure during the wann up to exceed a pressure equivalent to that at 40 percent power. With the turbine tripped and turbine first stage pressure greater than the equivalent at 40 percent power, an automatic reactor scram occurs.
The licensee has adoed a caution in the turbine startup procedure regarding the possibility of a reactor scram because of turbine first stop pressure during shell warming. Reactor startup is expected to comence during the day shift on February 22, 1988. The senior resident inspector is monitoring the licensee's actions.
There have been no news media inquiries-regarding this matter.
Neither the licensee nor the NRC plans to issue a press release.
The state of Louisiana will be infonned.
Region IV received notification of this occurrence by telephone from the Senior Resident Inspector at 7:30 a.m. (CST) on February 22, 1988. Region IV has informed NRR.
I This information has been confirmed with a licensee representative.
CONTACT-      E Y . Holler, FTS 8-8287                                                  h DRP LJ       1an:gb RA RDMa   n h     I 2/       88            2/4/88                                                           0 22        17 800222 PHO-IV-88-013A DCD

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