ML19308A538
| ML19308A538 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/26/1975 |
| From: | Herbein J METROPOLITAN EDISON CO. |
| To: | |
| References | |
| NUDOCS 7910260540 | |
| Download: ML19308A538 (2) | |
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FI OFFICE BOX 480 MDDLETOWN.12EMNSYLVANIA 17057 TELEPHONE 717-044 4C41 May 25.1975 5 f-0*O D
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D Mr. J.P. S*Reilly, Director oo Directorate of Regulatory Operations Region I ogg7 Q
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e-n JU.J King of Prussia, Pa.. 'IS406 Operating 1.5 cense DPR-50 Docket 50-269 St:bject: Abnemal Occurrence IJo. A0 75-13
Dear Mr. Omei11y:
This telegram is to confir:n the telecon between Nr. B. Davis (Region I-EO),
and J.G. Herbein (IMI Station Superintendent) at 1509 hours0.0175 days <br />0.419 hours <br />0.0025 weeks <br />5.741745e-4 months <br /> 25 April 1975.
The folicwing rcport is submitted in accordance with paragraph 6.7.2.a.4 (page G 11) of technical specifications.
On April 25, 1975, the D Reactor Protection System (!!PS) channel tri;: ped due to loss of pcstei.
As a result the undervolta';e coils to the Control Rod Drives (CRD) Secondary DC trip breakers were de-encrgized. Both breakers tripped.
In restoring the CRD system breakers to normal, an atte pt t.sas made to close the tuo DC breakers before the undervoltage enils were re-energized. One breaker closed, the cther breaker tripped free (did not close).
Both breakers should have tripped free in the presence of a trip signal. CC-4 is the dasignatica cf the breaker that =alfuncticned Both breakers were trip tested using the logic test switches in the T.PS Cabinet.
Both treakers responded correctly to the RPS trip signal, tharsby indicating that the breakers would opc 1 in the event a trip signal was received frcm the RPS Bistable Cabinct.
An investigation was made into the reason for the CB-4 treaker's ability to be closed with the undervoltage coil de-energized.
It was determined that the trip linkage from the undervoltage coil was out of adjustment.
The screw adjustment tras made in accordance with the vendor tech manual and the CB-4 breaker was satisfactorily trip tested.
In addition, it was verified that CS-4 would not close with a trip signal present prior to re-turning CB-4 to service.
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Ifr. J.P. O'Itcilly tiay 26. M75 The remaining DPS trip txrankers were then tested to assure that the trip linkage frto the rudervoltage coils was not eut of adjustment.
The remabring breakers op? rated correctly.
Very truly.ycurs, ro /
-t J.G. Aferbein
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Station Superintendent Dil fluc3etr Statian 4GH/ca D
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