ML20084E239
| ML20084E239 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 04/26/1974 |
| From: | Platt C ROCHESTER GAS & ELECTRIC CORP. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20084E228 | List: |
| References | |
| AO-50-244-74-07, AO-50-244-74-7, NUDOCS 8304140463 | |
| Download: ML20084E239 (1) | |
Text
.,,
?c3L i
o o
4
,p
'. f ROCHESTER GAS AND ELECTRIC CORPORATION
- 89 EAST AVENUE, ROCHESTER N.Y.1.16.:9
- Y. '- {@
Ml.t 'k.
aar a con 'i6 5302'00
.v Ginna Station
'.T. [@. '
April 26, 1974
- p. p.
.y$hikh a :n.;-
v.3. r
.Tf5.9,Y ef'N k.;.I g-R ~1' A
~.....a t.
.; m..
Mr. James P. O'Reilly, Director Directorate of Regulatory Operations Regica 1 U. S. Atomic Energy Commission Ng(p,,,,3 631 Park Avenue E
King of Prussia, Pennsylvnnia 19406
$J ;,7.4
.. r.,
rYs{.yfM -
Subject:
Abnormal Occurrence 74-7:
Failure of Underfrequency Relay
)6."':T#
During Surveillance Test Ginna Station L.*;,j;{e Docket 50-244 b /-
r C:.qy jp g%n(e,
Dear Mr. O'Reilly:
e a
a.%.o u.
This is to confirm my conversation with Mr. Walter Baunack today to
-_ EMQ report Abnormal Occurrence 74-7 at Ginna Station.
- c.,...s 2 :
During the morning of April 26, 1974, while conducting the routine E" * -
Monthly PT-9 Surveillance Test (Periodic Test - Undervoltage and E
Underf requencyProtection llA and 11B - 4160 volt Busses) one of the underfrequency relays on the 11A bus failed to transmit a signal to the logic racks when a fault condition was being simulated.
This
, J. cc W4 :,N.?
failure defeated one of the two channels of redundancy provided for underfrequency protection of this bus.
The faulty relay was replaced with a spare relay. The spare relay ihdk[$.]
was tested satisfactorily and declared operable at 1430 hours0.0166 days <br />0.397 hours <br />0.00236 weeks <br />5.44115e-4 months <br /> on
$;n Qp*
April 26, 1974.
hf; Very truly yours, qjW./'.h.:
8304140463 f00 4
97 Charles E. Platt
.f Superintendent 1
CEP:fah cc:
Mr. J. F. O' Leary, AEC Mr. G. J. Swarthout, RG&E
'ifVg j,r a