ML20084F646
| ML20084F646 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 09/14/1973 |
| From: | Amish K ROCHESTER GAS & ELECTRIC CORP. |
| To: | Oleary J US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20084F648 | List: |
| References | |
| AO-50-244-73-08, AO-50-244-73-8, NUDOCS 8304210212 | |
| Download: ML20084F646 (2) | |
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,,a ROCHESTER GAS AND ELECTRIC CORPORATION e 89 EAST AVENUE, ROCHESTER, N.Y.14649 G W
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wr September 14, 1973 A
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i qiy Mr. John F. O' Leary, Director hkA
-9 Directorate of Licensing 2 -$ h D
Office of Regulation C'
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U. S. Atomic Energy Commission 4.)
+, A Washington, D. C. 20545 g
Subject:
Failure of "A" Steam Generator Steam Flow Channel iG
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R. E. Ginna Nuclear Power Plant, Unit No.1 Docket No. 50-244 f
Dear Mr. O' Leary:
In accordance with the Ginna Station Technical Specifica'tions, Sectiot on September 7,1973, waerein a flow channel on the 1A Steam Generstdir~
6.6.2, Paragraph 1.9d, this is to report the abnormal occurrence, #73-8, failed downscale while at steady state operation at a power level of 1380 MWt.
e At 1643 hours0.019 days <br />0.456 hours <br />0.00272 weeks <br />6.251615e-4 months <br /> on Friday, September 7,1973, lA Steam Generator flow channel failed downscale. As the feedwater to the "A" Steam Generator f
was being controlled by the alternate flow channel, there was no change of feedwater flow.
Operations placed bistables FC465A (Hi Steam Flow) an11 FC465B (Hi Hi Steam Flow) in the trip mode. In this mode of operation, a two out of four, j.<
low T average signal plus a safety injection signal would have instituted -
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Loop A mairi steam line isolation.
While the channel was in the trip mode, the Plant Operations Review y
Committee met and determined that there was no safety problem by operat-ing in this manner due to the fact that with the bistables in a tripped mode safety injection and low T average woald still give a' reactor trip. The committee also directed the Instrument and Control personnel to enter containment to determine the cause of failure.
Their investigation resulted in the discovery that a flexure wire connecting a DP cell to a strain gage, which changes a pressure reading to a current reading, had failed at the soldered joint at the DP cell' connection.
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. ROCHESTER G AS AND ELECTRIC CORP.
SHEET NO.2 o4re, Ssptember 14,197 O
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Mr. John F. O' Lea V
t This type of failure is considered a random type of failure and due to the redundant flow channels on each Steam Generator which allow continued operation with components in the trip mode, no potential safety problem is known to have existed.
Very t y yours,
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eith W. Amish xc: Mr. James P. O'Reilly t
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