05000346/LER-1977-116-03, /03L-0:on 771228,during Auxiliary Feed Pump Monthly Surveillance Test,Turbine 1-2 Speed Control Lost & Declared Inoperable.Caused by Design Deficiency.Blown Control Power Fuse & Both Relays Replaced & Modified

/03L-0:on 771228,during Auxiliary Feed Pump Monthly Surveillance Test,Turbine 1-2 Speed Control Lost & Declared Inoperable.Caused by Design Deficiency.Blown Control Power Fuse & Both Relays Replaced & Modified

ML19329B884
Person / Time
Site:	Davis Besse
Issue date:	01/18/1978
From:	Beyer B TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19329B878	List: 05000346/LER-1977-116, Forwards LER 77-116/03L-0 05000346/LER-1977-116-03, /03L-0:on 771228,during Auxiliary Feed Pump Monthly Surveillance Test,Turbine 1-2 Speed Control Lost & Declared Inoperable.Caused by Design Deficiency.Blown Control Power Fuse & Both Relays Replaced & Modified
References
LER-77-116-03L, LER-77-116-3L, NUDOCS 8002060884
Download: ML19329B884 (2)

LER-1977-116, /03L-0:on 771228,during Auxiliary Feed Pump Monthly Surveillance Test,Turbine 1-2 Speed Control Lost & Declared Inoperable.Caused by Design Deficiency.Blown Control Power Fuse & Both Relays Replaced & Modified

Event date:
Report date:
3461977116R03 - NRC Website

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h a121l At 1600 hours0.0185 days <br />0.444 hours <br />0.00265 weeks <br />6.088e-4 months <br /> on 12/28/77 during the performance of ST 5071.01. "Auxiliarv Feed P,-n I

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TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION I

7 SUPPLEMENTAL INFORMATION FOR LER NP-33-77-116 p

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DATE OF EVENT: December 28, 1977' FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Auxiliary Feed Pump 1-2 speed control was lost.

The unit was in Mode 1, with Power (MWT) = 2064 Conditions Prior to Occurrence:

c.nd Load (MWE) = 689.

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Description of Occurrence: At 1600 hours0.0185 days <br />0.444 hours <br />0.00265 weeks <br />6.088e-4 months <br /> on December 28, 1977 durinr the perfor-mance of ST 5071.01, " Auxiliary Feed Pump Monthly Surveillance Test", Auxiliary Feed Pump Turbine (AFPT) 1-2 speed control was lost. Auxiliary Feed Pump 1-2 was declared inoperable placing the unit in the Action Statement of Technical Specification 3.7.1.2, which requires two independent Auxiliary Feed Pumps in Modes 1, 2 and 3.

i Designation of Apparent Cause of Occurrence:

The cause of this occurrence is a The relays used in the AFPT speed control circuit evidently design deficiency.

innot function without contact sticking or arcing under operating conditions.

_jticking or arcing contacts cause the control power-fuses to blow, resulting in c loss of speed control to the Auxiliary Feed Pump Turbine.

There was no danger to the health and safety of. the public Analysis of Occurrence:

or to unit personnel. Auxiliary Feed Pump 1-1 was operable to supply feedwater if a main steam line or feedwater break had occurred.

Corrective Action

The blown fuse and both of the relays in Auxiliary Feed Pump 1-2 speed control circuits were replaced.

Surveillance Test ST 5071.01, " Auxiliary Feedwater Monthly Test" was completed at 1730 hours0.02 days <br />0.481 hours <br />0.00286 weeks <br />6.58265e-4 months <br /> on December 28, 1977, return-

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ing Auxiliary Feed Pump 1-2 to opocable status. This removed the unit from the

. Action Statement of Technical Specification 3.7.1.2 well within the 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> limit.

A modification has been designed and, installed which adds a relay capable of operat-ing in the motor contact portion of the circuit under design conditions.

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There have been other failures due to blown fuses in the AFPT speed l

Failure Data:

load control circuits,.several before a modification was made to reduce current on relay contacts and two (one on AFP l-1 and one on AFP 1-2) since the modifica-tion was made on the Auxiliary Feed Pumps. All of the above failures occurred prior to the modification which added the additional relays.

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