View source for PNO-III-87-001A, on 870102,licensee Discovered Three Small Steam Leaks on Two of Four Main Steam Lines & on 870105, Following Repairs & Return of Steam Lines to Svc,Cracked Weld on Instrument Line/Valve Connection Found

{{Adams
| number = ML20212F735
| issue date = 01/06/1987
| title = PNO-III-87-001A:on 870102,licensee Discovered Three Small Steam Leaks on Two of Four Main Steam Lines & on 870105, Following Repairs & Return of Steam Lines to Svc,Cracked Weld on Instrument Line/Valve Connection Found
| author name = Farber M, Wright G
| 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-87-001A, PNO-III-87-1A, NUDOCS 8701120135
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION &amp; AUDIT &amp; I&amp;E CIRCULARS
| page count = 1
}}
{{#Wiki_filter:e yg PRELIMINARY ~ NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-III-87-01A~Date January 6, 1987 This. preliminary notification constitutes EARLY notice of events of.POSSIBLE safety or public interest ~ significance. The information is as initially received without
     .vsrification or evaluation, and is. basically all that is known by the Region III staff on this date.
Facility: ~ Detroit Edison Company.-                               Licensee Emergency Classification:
                   -Fermi 2-                                                                Notification of an Unusual Event Newport, MI 48166                                                      Alert Docket No. 50-341 Site Area. Emergency General Emergency M
v X Not Applicable

==Subject:==
SMALL STEAM LEAKS - - - (UPDATE)
On January 2,1987, the licensee discovered three small steam leaks on two of the four main steam lines. -The leaks were from broken spare instrument lines located between the turbine.
control valves and-the main turbine itself. (See PN0-III-87-01.)-
Thn. instrument line failures were at a bimetallic weld connecting the instrument tubing to a valve. The licensee plugged, capped and welded the broken lines.
The licensee identified five other instrument lines having this same bimetallic weld connection.
     'Of thsse.five lines, three are spare and two are-in-service providing steam pressure indication to the control room. ' The-licensee plugged, capped and welded the three spare lines. The two in-ssrvice lines were visually and liquid penetration inspected satisfactorily. The licensee completed repairs.and returned the steam lines to service on January 5~,1987.
    .At n:on on January 5, the licensee synchronized to the grid. Subsequently, the licensee
    -id;ntified a cracked weld on another instrument line/ valve connection and six small packing 1caks. The turbine has been taken off-line and the licensee is performing repairs.
Additionally, the licensee observed five missing or loose connectors on. snubber brackets associated with the steam lines downstream of the stop' valves. The licensee has initiated shift observations in the area of-the failed instrument lines and the loose connectors. The
    . instrument line failures may be attributed to vibration induced fatigue. This same vibration                                                       ,
' may have caused the loose connectors.                                                                                                                  '
R gion III (Chicago) is following the licensee's course of action.
J
~~ The State of Michigan will be notified.
4     This information i            nt as of 1:00   .                ST , January 6, 1987.
(     b.pur CONTACT: Martin arber FTS 388-5774 lf    G. Wri FTS 388-5695 t.
l[
: l. DISTRIBUTION:
H. St.        .
ED0        NRR                E/W                                Willste                Mail: ADM:DMB Chairman Zech                 PA                            IE                                  NMSS                          D0T:Trans only Comm. Roberts                 ELD                          OIA                                 RES
,     Comm. Asselstine
     'Comm. Bernthal~
w                             AE0D                                                       NRC Ops Ctr   NA              ;
. Conn. Carr
' ACRS SPd8b           Regional Offices                                                                                      l SECY~                         INP0 . M 'M                   NSAC /[. d O CA                            RIII Resident Office PDR                           Licensee:      4. Of                                (Corp. Office - Reactor Lic. Only) 1
:                                         e701120135 870106                                                                    Region III                i 87-01A PDR                                              -                  Rev. November 1986
               .      . _ . _ _ _ . . . - _ _ M .II__
_ . _ . - _ . _ , . . _ . _ . _ _ _ _ _ _ . _ . _ - , _ . _ . . _ . .}}

{{PNO-Nav|region=III}}