05000293/LER-1980-085-03, /03L-0:on 801023,HPCI Sys Turbine Reached 150% of 4,000 Rpm Full Flow Speed,Rendering Sys Inoperable.Caused by Failure of Turbine Governor & Resistor in Speed Control Circuitry.Governor & Resistor Replaced

/03L-0:on 801023,HPCI Sys Turbine Reached 150% of 4,000 Rpm Full Flow Speed,Rendering Sys Inoperable.Caused by Failure of Turbine Governor & Resistor in Speed Control Circuitry.Governor & Resistor Replaced

ML19345B843
Person / Time
Site:	Pilgrim
Issue date:	11/20/1980
From:	Mcloughlin M BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19345B838	List: 05000293/LER-1980-085, Forwards LER 80-085/03L-0 05000293/LER-1980-085-03, /03L-0:on 801023,HPCI Sys Turbine Reached 150% of 4,000 Rpm Full Flow Speed,Rendering Sys Inoperable.Caused by Failure of Turbine Governor & Resistor in Speed Control Circuitry.Governor & Resistor Replaced ML19345B843
References
LER-80-085-03L, LER-80-85-3L, NUDOCS 8012020606
Download: ML19345B843 (1)

LER-1980-085, /03L-0:on 801023,HPCI Sys Turbine Reached 150% of 4,000 Rpm Full Flow Speed,Rendering Sys Inoperable.Caused by Failure of Turbine Governor & Resistor in Speed Control Circuitry.Governor & Resistor Replaced

Event date:
Report date:
2931980085R03 - NRC Website

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NHC FORM 366 U.S. NUCLEAR REGULATERY COMMISSION (7 77)

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8 60 61 COCKET NUM8 ER 68 69 EVENT CATE 14 75 REPORT DATE 80 EVENT DESCRIPTION ANO OROBABLE CONSEQUENCES h l_o { 2 l l On October 23, 1980 at approximately 0640 hours0.00741 days <br />0.178 hours <br />0.00106 weeks <br />2.4352e-4 months <br /> following attemots to perform an HPCI I l o 6 31 l system surveillance test, the HPCI system was declared inoperable.

During the testing l lo44l l the turbine had experienced an overspeed condition approaching 150 percent of its 4000 l lo isI l rpm normal full flow speed and required operator action to stop it.

An immediate in-l lo ls l l vestigation revealed that the turbine's governor and a component in its speed control I lo l7l l circuitry had failed. The-turbine was repaired, tested and returned to service on l

October 25, 1980.

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36 37 40 41 42 43 44 47 CAUSE CESCRIPTION AND CORRECTIVE ACTIONS lt t o l jThe Terry Turbine's governor was replaced, in kind, and a failed resistor in its controll

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Because the turbine had ooerated in an overspeed condi' ma. -M aronnade personnel in concert with the manufacturer's recommendations inspected the turbine beariggs

, gand during operational testing checked its vibration levels.

No abnormal conditions werg detected.

Following completion of its functional testing, the unit was returned to an l

7 8 9 operable status.

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