PNO-V-87-032, A:licensee Investigations Into Manner in Which Small Stones Introduced Into Hot Leg Side of Steam Generator 1 Determined That Stones Carried Into Generator During Erection of Work Platform.Tubes in Generators to Be Plugged: Difference between revisions

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#REDIRECT [[PNO-V-87-032A, licensee Investigations Into Manner in Which Small Stones Introduced Into Hot Leg Side of Steam Generator 1 Determined That Stones Carried Into Generator During Erection of Work Platform.Tubes in Generators to Be Plugged]]
| number = ML20214J946
| issue date = 04/29/1987
| title = PNO-V-87-032A:licensee Investigations Into Manner in Which Small Stones Introduced Into Hot Leg Side of Steam Generator 1 Determined That Stones Carried Into Generator During Erection of Work Platform.Tubes in Generators to Be Plugged
| author name = Richards S, Zimmerman R
| author affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
| addressee name =
| addressee affiliation =
| docket = 05000530
| license number =
| contact person =
| document report number = PNO-V-87-032A, PNO-V-87-32A, NUDOCS 8705280261
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION & AUDIT & I&E CIRCULARS
| page count = 1
}}
{{#Wiki_filter:PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-V-87-32A Data: 04/29/87 This preliminary notification constitutes EARLY notice of POSSIBLE safety or public interest significance. The information presented is as initially received without v:rification or evaluation and is basically all that is known by Region V staff on this l date.
FACILITY:        Arizona Nuclear Power Project                  Emergency Classification Palo Verde Unit 3                                    Notification of Unusual Event Docket No. 50-530                                    Alert Site Area Emergency General Emergency                ;
                                                                  ,T,_~Not Applicable
 
==SUBJECT:==
FOREIGN MATERIAL FOUND IN STEAM GENERATOR - PNO-V-87-32 UPDATE l
The licensee's investigation into the manner in which a number of small stones were introduced into the hot leg side of the No.1 Steam Generator determined that they were most likely carried into the generator unintentionally during erection of the work platform. The Itcensee's investigation included interviews with personnel involved, r: view of material accountability records and the development of a detailed chronology cf all work activities in the hot leg side of No. 1 Steam Generator. A temporary wooden                :
dam had been installed in the hot Icg of the No. 1 Steam Generator prior to errection of l the platform. Although the train of shutdown cooling which takes suction from the No. 1 St:am Generator hot leg had been run for approximately 1 hour between the time the platform was erected and the discovery of the stones the licensee believes the probability that any foreign material was transported through the shutdown cooling system back into the reactor vessel is very small. A boroscopic examination down the hot leg side of the No.1 Steam Generator into the shutdown cooling suction line found na foreign objects to be present. Visual inspection of the cold leg side of the No. 1 Stram Generator and the cold and hot leg sides of the No. 2 Steam Generator revealed no foreign material. The platform erected in the hot leg side of the No. 1 Steam Generator was of different construction than the other platforms erected within the steam generators. This platform had been used previously in the licensee's steam generator mock up, was constructed of steel plating rather than wood, and had been stored for a time in an outside area.
The licensee is currently proceeding with the selected preventive tube plugging inTthe st:am generators. Approximately 60 tubes per generator are to be plugged.                      [
Unit 3 is currently in Mode 5 with initial criticality scheduled for July,1987.                      "
This information is current as of 1:50 TH (MST) April 29. 1987.                                      T CONTACT:  R. Zimmerman                        S. Richards                                    r (602)386-5260                      FTS 463-3853                                    g DISTRIBUTION                                                                                            l H St.                NNBU        Phillips V E/W          W111ste        Air Rights    Mail Chairman Zech      ED0          NRR          IE          NMSS                        ADMIDMB Comm. Carr              PA                        OIA      RES                DOT Trans Only Cons. Bernthal          MPA                      AE00                                            1 Com. Roberts            ELD Com. Asselstine                    Regions:
SECY                              INP0        NSAC ACRS                              Liceiisect ~
CA                                (ReactorLicensees)~                      REGION V: FORM 211 PDR                                Resident Inspector                        (Revised 3/14/83) g52g61070429 PNO-V-07-032A      P Dft
_f        f}}
 
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