ML20084G915
| ML20084G915 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 03/10/1972 |
| From: | Finfrock I JERSEY CENTRAL POWER & LIGHT CO. |
| To: | Morris P US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8304270123 | |
| Download: ML20084G915 (2) | |
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Jersey Central Powey & Light Company sl M ADISoN AVENUE AT PUNCH BOWL Ro AD e MoRRISTOWN, N.J. 07960 o $39-6118 March 10, 1972
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United States Atomic Energy Commission
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Washington, D. C. 20545
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Dear Dr. Morris:
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Subject:
Oyster Creek Station Docket No. 50-219 Loss of 4160V Emergency Bus 1C The purpose of this letter is to report to you a violation of our literal interpretation of Technical Specification 3 7.B that occurred on December 22, 1971 for approximately five minutes. During this period, the 4160V Emergency, Bus 1C was deenergized and the specification requires that kl60V Emergency Bus 1C and 1D be energized, otherwise the reactor shall be placed in a cold shutdown condition.
This specification is not consistent with other requirements of our license in that a reasonable out-of-service time is not allowed for testing and minor repairs of a redundant safety system. However, in our opinion, the intent of this specification was met in that an adequate supply of power with at least one active and one standby source was available for operation of equipment required for a safe shutdown, to maintain the plant in a safe shutdown: condition, or to operate the required engineered safety feature, equipment following an accident. We vill submit a proposed revision to this specification that will be consistent with other relat6d specifications in the near future.
The details related to this incident are as follows:
Two of the three current transformers that supply overload protection and metering for 4160V Auxiliary Bus lA failed. As a result, power to 4160V Auxiliary Bus lA vas trtetsferred from the Auxiliary Trans-former supplying Bus lA to the Startup Transformer that supplies rl Bus lA in order to regain protection for the bus.
The Auxiliary
. hllI Transformer current transformers were repaired and in the process Sk lj l (Y1 hb B304270123 720310
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Dr. Peter A. Morris Page II March 10, 1972 of a circuit checkout prior to installation of the repaired transformers, the 1C Bus was tripped for approximately five minutes. During the entire period Auxiliary Bus lA,1B, and Emergency Bus 1D vere operational.
We are enclosing twenty-five copies of this report.
Very truly yours,
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()Gff J/f 46KJ Ivan R. Finf ek, r.
Manager, Nuc ear Generating Stations IRF/pk Enclosures cc: Mr. J. P. O'Reilly, Director Division of Compliance, Region I N
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