05000346/LER-1977-083-03, /03L-0:on 771025,stop Valve AF3872 Failed to Stroke When Given Open Signal.Caused by Component Failure. Torque Switch Replaced on 771027

/03L-0:on 771025,stop Valve AF3872 Failed to Stroke When Given Open Signal.Caused by Component Failure. Torque Switch Replaced on 771027

ML19329B302
Person / Time
Site:	Davis Besse
Issue date:	11/22/1977
From:	Jerrica Johnson TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19329B295	List: 05000346/LER-1977-083, Forwards LER 77-083/03L-0 05000346/LER-1977-083-03, /03L-0:on 771025,stop Valve AF3872 Failed to Stroke When Given Open Signal.Caused by Component Failure. Torque Switch Replaced on 771027
References
LER-77-083-03L, LER-77-83-3L, NUDOCS 8002040725
Download: ML19329B302 (2)

LER-1977-083, /03L-0:on 771025,stop Valve AF3872 Failed to Stroke When Given Open Signal.Caused by Component Failure. Torque Switch Replaced on 771027

Event date:
Report date:
3461977083R03 - NRC Website

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60 61 COCKET NUMBER 68 59 EVENT OATE 74 75 REPORT QATE do EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h I o l 2 I l On October 23, 1977 during the performance of ST 5071.01, AF3872 initially failed to I l o 13 l l stroke when it was given an open signal.

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Io I4 l l would stroke normally. Test gauges indicated leakage past Check Valves which caused i IoIsl I a backpressure. Although the starting of the Auxiliary Feed Pump would equalize the i l differential across the valve, Stop Valve AF3872 was declared inoperable for mainte-I lo is l l o j 71 I nance at 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br /> on October 25, 1977, placing the Station in the Action Statement !

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TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION V)'

SUPPLEMENTAL INFORMATION FOR LER NP-33-77-83 DATE OF EVENT:

October 25, 1977 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Failure of AF3872, Auxiliary Feed Pemp 1-2 to Steam Generator Conditions Prior to Occurrence: The plant was in Mode 3, with Power (MWT) = 0 and Load (MWE) = 0.

Descriptica of Occurrence: On October 23, 1977 during the performance of ST 5071.01, Auxiliary Feedwater System Monthly Test, Stop Valve AF3872 initially failed to stroke when it was given an open signal.

Stop Valve AF3872 was manually stroked whereupon it would stroke normally. Pressure gauges were installed between AF3872 and Steam Generator 1-2.

These gauges indicated leakage past Check Valves AF43 and AF75 which caused a pressure of approximately 800 PSIG. Although the starting of the Auxiliary Feed Pump would equalize the differential across the valve, Stop Valve AF3872 was declared inoperable for naintenance at 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br /> on October 25, 1977, placing the Station in the Action Statement of Technical Specification 3.7.1.2.

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Designation of Acparent Cause of Occurrence: The inability of the Stop Valve AF3872

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to stroke was due to component failure.

Stop Valve AF3872 is designed to open with s_,

1500 PSI backpressura; hewever, the open torque switch would torque out with 800 PSIG backpressure.

Analysis of Occurrence: There was no danger to the health and safety of the public or to Station personnel. The redundant AFP (1-1) was available for emergency operation if required.

Corrective Action

The torque switch was replaced on October 27, 1977. At 0630 hours0.00729 days <br />0.175 hours <br />0.00104 weeks <br />2.39715e-4 months <br /> on October 27, 1977, Stop Valve AF3872 was stroked and it operated properly, removing the Station from the Action Statement of Technical Specification 3.7.1.2.

l Failure Data: There have been no previously reported inoperabilities of a notor operated valve caused by a defective torque switch.

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