View source for PNO-I-89-027, on 890412,RCIC Injection Valves Unexpectedly Opened During Testing of Sys Logic.Discharge Check Valve Failure Also Allowed Feedwater Backleakage,Contaminating Five Workers Slightly.Augmented Insp Team Dispatched

{{Adams
| number = ML20244C056
| issue date = 04/13/1989
| title = PNO-I-89-027:on 890412,RCIC Injection Valves Unexpectedly Opened During Testing of Sys Logic.Discharge Check Valve Failure Also Allowed Feedwater Backleakage,Contaminating Five Workers Slightly.Augmented Insp Team Dispatched
| author name = Blough A
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION I)
| addressee name = 
| addressee affiliation = 
| docket = 05000293
| license number = 
| contact person = 
| document report number = PNO-I-89-027, PNO-I-89-27, NUDOCS 8904200019
| 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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              ~ r'                                                                  DCS No:  50293890412
      *i                                                                            Date:    April 13, 1989
       'PRELI.MINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-I-89-027.
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 I staff on this date.
1 Facility:                                                   Licensee Emergency Classification:
Notification of Unusual Event Boston Edison Company                                               Alert
       -Pilgrim Nuclear Power Station                                        Site Area Emergency .
D:cket No. 50-293                                                   General Emergency X Not Applicable

==Subject:==
AUGMENTED INSPECTION TEAM DISPATCHED About 9:15 a.m., April-12, 1989, the. Reactor Core Isolation Cooling (RCIC) injection valves' opened unexpectedly during a test of the system logic. The RCIC discharge check valve also failed to properly seat, allowing backleakage of feedwater to the low pressure RCIC suction piping. The suction piping relief valve lifted, its discharge overflowed the RCIC room sump, and about three inches of water quickly accumulated on the room floor before operators shut the injection valves to terminate the event. Five workers were slightly contaminated and were promptly decontaminated.
Th::re was no offsite release of-radioactivity. A licensee evaluation of the event is underway. One proximate cause of the event appears to be failure to properly disable tha isolation valves prior to start of the test.                           The RCIC system has been isolated and declared inoperable pending evaluation. Technical-Specifications allow continued op: ration of the plant (which is operating just below the 25% NRC approval point) for seven days with RCIC inoperable.
An Augmented Inspection Team (AIT) led by a Region I Section Chief, will begin an onsite inspection this morning to determine the sequences, causes, and significance
      'of.the events.
A member of the NRC Restart Staff was in.the control room shortly after the event.
The licensee issued a press release regarding the event at about 3:00 p.m. An ENS call was made at 5:25 p.m. The Commonwealth of Massachusetts has been informed. NRC Region I will respond to press iaquiries and will issue a press release to announce the AIT.
CONTACT:       A. Randy Blough (FTS) 346-5146
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OWFN                           MNBB                   H-St.                NL        Mail: ADM:DMB Chairman Zech                  AE00                   ACRS                 RES               DOT:Trans only Comm. Roberts                  ARM                    PDR Comm. Carr                     OGC                                                   NRC Ops Ctr Comm. Rogers Comm. Curtiss                                                              INP0----
SECY        NMSS                                                           NSAC----
CA          NRR                                                                                                                j OGC        OIA                 Regional Offices                                                                                I l
GPA        01                                                              RI Resident Office PA          SLITP EDO        DE                                                              Licensee:
8904200019 890413
* D ls PDR       I&E                                                                    j
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PDC
_ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _PN0 _I-
_                        89-027 ___                                                   _)7 !

Regi6n'I Form.83-
         . ,(, Rey. April' 1988) ,.
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:1NRC1718' Chairman Zech Comm Roberts Comm Carr.
Comm Rogers Comm Curtiss ACRS SECY CA' PDR                                       . . _
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