ML19273B921

LER 79-033/03L-0 on 790518:HPCI Turbine Tripped on Mechanical Overspeed at 3,500 Rpm.Caused by Spring Adjusting Screw Being Approx Five Turns Out of Position.Set Screw for Securing Spring Adjusting Screw Was Approx Six Turns Out

ML19273B921
Person / Time
Site:	Brunswick
Issue date:	06/13/1979
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19273B920	List: ML19273B919 ML19273B921
References
LER-79-033-03L-01, LER-79-33-3L-1, NUDOCS 7906180514
Download: ML19273B921 (2)

Text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION (7 77) .

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jo 3 l an LCO for a routine calibration, the HPCI turbine tripped on mechanical overspeed at l jo 4 l3500 RPM. The required overspeed trip setting is 5000 RPM.+2%. This turbine trip was l fo S inot reported under an additional LCO or other notification method. l Lo 6 l l

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9 LER CONTINUATION -- RO # 2-79-33 Facility: BSEP l' .it #2 Event Date 5-18_7,9 technical manual and the turbine mechanical overspeed trip was tested several times.

The Terry Turbine representative stated that if the set screw is correctly installed, it will lock with the threads of the spring adjusting screw and will not be able to back out. The turbine has been run several times since with no problems. The setscrew and the spring adjusting screw on both units were checked during the past refueling outages with no discrepancies found. This is considered an isolated incident and no further action is required.

Through an administrative deficiency, this event was not detected until May 18, 1979. The HPCI system was under an LCO for a non-reportable reason. When additional problems developed that were reportable, they were maintained under the same LC0; therefore, the reportable problen was not reviewed by management. An administrative procedure is being written to ensure that all such occurrences are identified, reported, and properly reviewed.

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