ML20086L211

Telecopy AO 74-18:on 740330,diesel E-4(D) Failed to Start. Caused by Spurious Operation of TD-2 Relay.Diesel Successfully Started & Surveillance Test Completed

ML20086L211
Person / Time
Site:	Peach Bottom
Issue date:	04/01/1974
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086L209	List: ML20086L205 ML20086L211
References
AO-74-18, NUDOCS 8402070464
Download: ML20086L211 (1)

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j Identification of Occurrence

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p;Q .v i< Diesel start failure. *

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_, Conditions Prio,r to Occurrence: , i a

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,:' Description of Occurretae: m . :.

During the performance of a rodtine surveillance test on the E-4(D)

. ggp;g' diesel, the diesel tripphd during the starting sequence. An 4Qgj f Jyy;,J

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irmnediate restart of the diesel was successful. -

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' Designation of Apparent Cause of Occurrence: ,

During the start failure, the " Diesel Fail to Start" annunciator y 'f M

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was also actuated. The SDR relay which actuates this annunciator p

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and trips the diesel is energized by a contact of the TD-2 time-ff fg.1,"

delay relay. This time delay relay is designed to shutdown the diesel if engine speed is less than 250 rpm within 10 seconds 1,% ,f..y

& G J;.0 J following the initiation of the starting sequence. The start

? j failure is believed to have been caused by a spurious operation ' $1G#

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L of the TD-2 relay. '8402070464 740409 4.l[hf*:

p PDR ADOCK 05000277 MC ID 7 .

$,I Analysis of Occurrence: S PDR p

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Because the diesel was re-started successfully insiediately af ter *

< f, q "y its initial failure to start, the diesel was only inoperable for a

' . few minutes. Sufficient diesel capacity and emergency core -

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cooling systems are available to respond to the design basis

.: h accident with one diesel generator inoperable. This is recognized \g

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f in that the Technical Specification permits continued operation

_ $ vith one diesel inoperable for a period of seven days. The short h h_ .Axg h,

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l l @orrectnve Action:

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After th2 succe the surveillance l i'db test'was comple ul restart The three ofother the E-4(D) Diess[

diesels vert )1so proven -

. operable. The E- diesel circuitry associated with the TD-2 time delay relay was then inspected and checked because a " Diesel Fall to Start" annunciator was again actuated when the diesel was

' , successfully restarted. This investigation proved that the' relay time delay was properly set and had not changed. It also proved that a resistor across the coil circuit of several relays in parallel with the TD-2 relay was not open circuited and of the

~~s,,, correct value. No control or circuitry malfunction was identified as a result of this investigation. Following this investigation, the E-4(D) diesel was successfully started four times. No " Diesel Fail to Start" annuneintor was actuated during these successful starts. In order to ensure continued starting capability, the E-4(D) diesel will be started each day for the next seven days.

i If no failures to start occur, the diesel shall be returned to its original testing schedule.

Failure Data:

No previous diesel start failures have occurred.

y ,, "M dg k'.T. Ullrich, Superintendent

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