ML19322A433
| ML19322A433 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 02/22/1976 |
| From: | Colitz J METROPOLITAN EDISON CO. |
| To: | |
| Shared Package | |
| ML19322A432 | List: |
| References | |
| NUDOCS 7910240873 | |
| Download: ML19322A433 (2) | |
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'/2 iE5l 90LLTAC: EDtSON CCthPANY sua:rorsav or arnraat. rva
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Of FLCE' DOR 480 MIDDLETOWN.PENNGYLVANTA M57 TELEPHONE 777-944 4041 February 22,. I.976 F 'f $
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Mr. J. P. O'ReitTy bw Directorate of Reguiatory Operations p'
Region L Nuclear Regulatory Commission h,9 I, A G31 Park Avenna King of Prussia,, Pennsylvanta 19405 o L 5] L 3
Operating License DPR-50 Dacket 50-289 SCHKET: Reportable Occurrence ib. 76-10/IP Dear Mr. O'RedIly-Tfris teTegram is to cenfirm the telecan betweerr Mr. Lee Spessard (Regfon 1 NRC) and Mr. J. P. O'Hanlon (TPJ-I. P0HC Chairman) at 1715 hours0.0198 days <br />0.476 hours <br />0.00284 weeks <br />6.525575e-4 months <br /> orz 21 February 1976.
The foTToning report is submitted to accordance witir Paragraph 6.7.2.a.S (Page 6-11) of the Technical Specifications.
Onring performance of the Emergency Sequence and Power Transfer Tests the breaker for the n diesel senerator failed tu cTose. The cause for the failure was determined to'be an incorrect setting on the standby Timit (high ilmit) on the diesel generatar strarnor.
The lower than nores) settine arr the covernor caused the diesel to operata at appreximatnTy 59.2 Hertz wnen it autom.atically started en the E5 signal. The Tow frequency cendition resulted fre only one of the frequency relays (81X2) becoming energized.
The rematnir.g twa frecuency relays did nur energire; thus the 2 out af 3 interlock which permits breaker closing was nat satisfied.
The breaker cculd have been closed from use orrtrol room by manually increasing the governor setting.
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. 2/22/76 The sett'og on the governor was adjustad and the stesei was satisfacturi7y tested.
The A D' 'sel Generator was atsu tested as part crf the Energency Segsence and Pa>.t Transfer Test and operated as regatred.
Very truly yours,.
}. 90 J Colit Unft 1 Sup$ ini,endent Three Mile Island Nuclear Statte JJC:JPO:bh l
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