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

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

ML20212F735
Person / Time
Site:	Fermi
Issue date:	01/06/1987
From:	Farber M, Wright G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
PNO-III-87-001A, PNO-III-87-1A, NUDOCS 8701120135
Download: ML20212F735 (1)

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.

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l. DISTRIBUTION:

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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~

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. 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

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