PNO-II-85-071A, broken Valve Stem Discovered Following Disassembly of Inboard Main Steam Line Isolation Valve. Caused by Metal Fatigue.Evaluation Continuing: Difference between revisions

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#REDIRECT [[PNO-II-85-071, on 850724,unit Tripped as Result of High Steam Flow Signal.Caused by Malfunctioning Msiv.Unit out-of-svc for 3 to 5 Days While Valve Repaired & Maint Work Performed]]
{{Adams
| number = ML20132E839
| issue date = 07/26/1985
| title = PNO-II-85-071A:broken Valve Stem Discovered Following Disassembly of Inboard Main Steam Line Isolation Valve. Caused by Metal Fatigue.Evaluation Continuing
| author name = Brownlee V, Panciera V
| author affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
| addressee name =
| addressee affiliation =
| docket = 05000321
| license number =
| contact person =
| document report number = PNO-II-85-071A, PNO-II-85-71A, NUDOCS 8508020120
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION & AUDIT & I&E CIRCULARS
| page count = 1
}}
{{#Wiki_filter:July 26, 1985 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PN0-II-85-71A This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without veriff-cation or evaluation, and is basically all that is known by the Region II staff on this dat2.
FACILITY: Georgia Power Company                    Licensee Emergency Classification:
Hatch Unit 1                                Notification of Unusual Event Docket No. 50-321                          Alert Baxley, Georgia-                            Site Area Emergency General Emergency X Not Applicable
 
==SUBJECT:==
UNSCHEDULED SHUTDOWN GREATER THAN 48 HOURS - UPDATE This PN updates PNO-II-85-71, issued July 25, 1985.
Disassembly of the inboard main steam line isolation valve in main steam line "A"        has revealed a broken valve stem in the vicinity of the stem's backseat portion.
It appears that the break may have been caused by a metal fatigue failure. The affected valve in Unit I was manufactured by Atwood Morrel, but main steam isolation valves in Hatch Unit 2--which is operating at 100 percent power--are from a different vendor.        Georgia Power is continuing to evaluate the valve problem.
Georgia Power is prepared to respond to media inquiries.
The State of Georgia has been informed.                                                        )
This information is current as of 11 a.m. (EDT) today.
 
==Contact:==
V. Panciera, 242-5525                              V. Brownlee, 242-5583 DISTRIBUTION:
H. Streettitcf    MNBB/                    J Willsted.0 ' MAIL:
Chairman      Palladino TF.;t.tsPhillips/yaf/W NRR        T      F-NMSS        XDRIDiB Comm. Roberts        PA                  OIA    RES          D0T:  Trans Only Comm. Asselstine      MPA                AE00                Applicable State Comm. Bernthal        ELD Comm. Zech          Air Rights Il      INP0 //3 D SECY                      SP            NSAC ACRS R                      Regions: J /1:1r % po      gg #tL gM Licensee:u_f27ev a ftp (ReactorLicensees)
Applicable Resident Site [/f(,
OMG M~
8508020120 850726 PDR  IIE PNO-II-95-071 A PDR                                                            I}}
 
{{PNO-Nav|region=II}}

Latest revision as of 13:07, 21 August 2022

PNO-II-85-071A:broken Valve Stem Discovered Following Disassembly of Inboard Main Steam Line Isolation Valve. Caused by Metal Fatigue.Evaluation Continuing
ML20132E839
Person / Time
Site: Hatch Southern Nuclear icon.png
Issue date: 07/26/1985
From: Brownlee V, Panciera V
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:
References
PNO-II-85-071A, PNO-II-85-71A, NUDOCS 8508020120
Download: ML20132E839 (1)
v • d • e


July 26, 1985 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PN0-II-85-71A This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without veriff-cation or evaluation, and is basically all that is known by the Region II staff on this dat2.

FACILITY: Georgia Power Company Licensee Emergency Classification:

Hatch Unit 1 Notification of Unusual Event Docket No. 50-321 Alert Baxley, Georgia- Site Area Emergency General Emergency X Not Applicable

SUBJECT:

UNSCHEDULED SHUTDOWN GREATER THAN 48 HOURS - UPDATE This PN updates PNO-II-85-71, issued July 25, 1985.

Disassembly of the inboard main steam line isolation valve in main steam line "A" has revealed a broken valve stem in the vicinity of the stem's backseat portion.

It appears that the break may have been caused by a metal fatigue failure. The affected valve in Unit I was manufactured by Atwood Morrel, but main steam isolation valves in Hatch Unit 2--which is operating at 100 percent power--are from a different vendor. Georgia Power is continuing to evaluate the valve problem.

Georgia Power is prepared to respond to media inquiries.

The State of Georgia has been informed. )

This information is current as of 11 a.m. (EDT) today.

Contact:

V. Panciera, 242-5525 V. Brownlee, 242-5583 DISTRIBUTION:

H. Streettitcf MNBB/ J Willsted.0 ' MAIL:

Chairman Palladino TF.;t.tsPhillips/yaf/W NRR T F-NMSS XDRIDiB Comm. Roberts PA OIA RES D0T: Trans Only Comm. Asselstine MPA AE00 Applicable State Comm. Bernthal ELD Comm. Zech Air Rights Il INP0 //3 D SECY SP NSAC ACRS R Regions: J /1:1r % po gg #tL gM Licensee:u_f27ev a ftp (ReactorLicensees)

Applicable Resident Site [/f(,

OMG M~

8508020120 850726 PDR IIE PNO-II-95-071 A PDR I

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