ML19318B701
| ML19318B701 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 05/19/1980 |
| From: | DETROIT EDISON CO. |
| To: | |
| Shared Package | |
| ML19318B699 | List: |
| References | |
| NUDOCS 8006270334 | |
| Download: ML19318B701 (1) | |
Text
n FINAL REPORT WESTINGHOUSE FUSIBLE DISCONNECT SWITCHES ENRICO FERMI 2 May 19, 1980 During testing by the Detroit Edison Start-Up Organization, it was noted that fourteen (14) out of forty-three (43) Westinghouse switches located in nine different distribution cabinets had failed. Failure of switches were noted in both opening and closing. Four of the nine panels were QA Level I.
Five failures were noted in the QA Level I panels. The switches that failed were double pole, single throw, type FDP, Catalog /lFDPF-C2211 which were rated at 30 amperes, 240 volts AC/250 Volts, DC.
These switches were included as part of a purchase from Harlo Corporation, with switches and panel boxes by Westinghouse (subvendor).
I In.particular, these FDP switches exhibited the following characteristics during Start-Up testing:
1.
Failure of mechanism to open when the handle is slcwly pushed to "0FF".
j 2.
Failure to close when the handle is slowly pushed to "0N".
3.
Contacts splitting during manual operation of the switch.
Thus, the ability to open the switch's hinged cover while the circuit is still energized, even though the indicator shows "0FF",
is a definite shortcoming and hazard to the operator.
Failure of these switches was limited to manual operation of opening and closing and was detected during normal Start-Up testing. These failures primarily occurred when the switches were operated slowly, with steady-state performance not in question. Corrective action consists of Edison replacing these devices with other suitable equipment for the following reasons:
1.
Lack of mechanical adjustment in these switches to insure positive toggle:to either "0N" or "0FF" position.
2.
Possible hazard to operator while removing fuses.
3.
. Poor 1ccation of fuses within the switch.
Class 1E panel boxes which will be replaced are listed as follows:
Hil-P901, 902, 903, and 904 H21-P557, 558, 559, 560, 561, and 562 9 o neno.3J.T
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