View source for PNO-III-88-001, on 871231,reactor Scrammed from 75% Power as Result of High Water Level in Reactor,Caused by Personnel Error During Installation of Auxiliary Computer Intended to Monitor Feedwater Heater Temp

{{Adams
| number = ML20198M862
| issue date = 01/04/1988
| title = PNO-III-88-001:on 871231,reactor Scrammed from 75% Power as Result of High Water Level in Reactor,Caused by Personnel Error During Installation of Auxiliary Computer Intended to Monitor Feedwater Heater Temp
| author name = Greenman E, Pelke P
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION III)
| addressee name = 
| addressee affiliation = 
| docket = 05000341
| license number = 
| contact person = 
| document report number = PNO-III-88-001, PNO-III-88-1, NUDOCS 9710300074
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION &amp; AUDIT &amp; I&amp;E CIRCULARS
| page count = 1
}}
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PRELININARYNOTIFICATION0FEVENTORUNUSL'COCCURRENCE--PNO-III-88-01$6ateJanuary4,1988 b         This reliminary notification constitutes EARLY notice of _ events of POSSIGLE safety
            -or pu lic interest significance, s The~1nformation is as' initially received without (b vertfication or evaluation, and is basically all- that is known by the Region III staff on this date.
Facility: Detroit Edison Company                   Licensee Emergency Classification:
Forst 2            .                       Notification of an Unusual Event 6450 N. Dixie Highway-                     Alert Newport, MI 48166                          Site Area Emergency General Emergency C Not Applicable

==Subject:==
REACTOR SCRAM DUE TO INCREASED FEEDWATER FLOW At6:52p.m.(EST)onDecember 31, 1987, the reactor scranned from 75; percent power as a result of. high water level in the reactor. The increased water level was caused by a personnel error during the installation of an auxiliary computerA ntended to monitor feedwater heater temperature.- While the computer was being connected to'the main process computer, a lead carrying the feedwater flow data'to the main process
* computer was-inadvertently grounded (shorted). Although feedwater flow' remained :normai r the control system " sensed" a 50 percent reduction in the flow and increased the) flow' rate into the reactor vessel.
The high reactor water level signal caused a trip of the feedwaterhurbines, followed by a main turbine-generator trip, and the reactor scram. The unit's safety systems functioned normally during the scram, although a post-accident recorder did not switch to high speed,       '
             -as required, and leakage was observed from a feedwater heater pump seal.-
N The reactor remains shut down for maintenance and routine surveillSece; testing.        The m             licenseeexpectstorestarttheplantonJanuary5,1988.~,{TheMicensee_iscurrently On December 30, 1987, the;11censee'" requested. Region III,
     'v) llinited to 75 percent power.(Chicago) authorization to increase to full power. The request-is under The State of Michigan will be infonned.
              'There has been local news media interest in the reactor shutdown.
The Headquarters Operations Center was notified of- the reactor scram'a't%8:12_ p.m. (EST) on December 31, 1987. This information is current as of 12 Noon (EST);' January 4,1988.
CONTACT:  P. Pelke FTS 388-5560               E. Greenman FTS 388-5518 DISTRIBUTION:                                                         .                    O/
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Rev. November 1987
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