ML20086L211
| 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: |
| References | |
| AO-74-18, NUDOCS 8402070464 | |
| Download: ML20086L211 (1) | |
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- j Identification of Occurrence
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Diesel start failure.
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,:' Description of Occurretae:
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During the performance of a rodtine surveillance test on the E-4(D)
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irmnediate restart of the diesel was successful.
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' Designation of Apparent Cause of Occurrence:
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y 'f M During the start failure, the " Diesel Fail to Start" annunciator
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was also actuated. The SDR relay which actuates this annunciator p
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delay relay. This time delay relay is designed to shutdown the 1,%,f..y diesel if engine speed is less than 250 rpm within 10 seconds
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following the initiation of the starting sequence. The start
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j failure is believed to have been caused by a spurious operation 4.l[hf*:
L of the TD-2 relay.
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$,I Analysis of Occurrence:
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Because the diesel was re-started successfully insiediately af ter
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"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
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.: h accident with one diesel generator inoperable. This is recognized
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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 hh_
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l l @orrectnve Action:
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After th2 succe ul restart of the E-4(D) Diess[ )1so proven l i'db test'was comple the surveillance The three other diesels vert 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
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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 In order to ensure continued starting capability, the starts.
E-4(D) diesel will be started each day for the next seven days.
If no failures to start occur, the diesel shall be returned to its i
original testing schedule.
Failure Data:
No previous diesel start failures have occurred.
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"M d g k'.T. Ullrich, Superintendent
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