ML19345A710
| ML19345A710 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 05/14/1973 |
| From: | Autio H YANKEE ATOMIC ELECTRIC CO. |
| To: | US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| AO-73-3, NUDOCS 8011250020 | |
| Download: ML19345A710 (3) | |
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YANKEE ATOMIC ELECTRIC COMPANY (w-ROWE, MASSACHUSETTS 01367
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United States Atomic Energy Commission Washington, D. C.
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Attention: Directorate of Licensing
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License No. DPR-3 (Docket 50-29)
Reference:
Dear Sir:
With reference to the reporting requirements specified in current AEC approved Technical Specifications, Yankee Atomic Electric Company hereby submits a ten (10) day written report for Abnormal Occurrence No. 73-3.
The plant protective system includes a pemissive circuit This pemissive which provides various reactor trips above 15 MWe.
circuit is activated by three pressure switches which sense the turbine 1st stage pressure.
hhen the plant was returtd to power operation following the extended shutdown for control rod / shroud tube replacement, a decrease The decrease in in the nomal indicated 1st stage pressure was noted.
pressure is attributed to leakage in the turbine 1st cuage pressureSince the decrease in sensing line inside the high pressure turbine.
the indicated 1st stage pressure has an effect upon the point at which the turbine pemissive relays are activated, and repair of the sensing line would require complete disassembly of the high pressure turbine, a study was undertaken to detemine appropriate corrective action.
A program was established to investigate various alternatives 3
and plans were made to initiate the program during the shutdown for con-trol rod surveillance testing which was scheduled for Saturday May 5th.
The intent of the program was to:
1.
Determine if recalibration of the turbine 1st stage l
pressure switches would be a feasible approach.
Take data to check the possibility of using the turbine 2.
- 1 nozzle pressure sensing line as an alternate signal source.
Explore all other reasonable alternatives which might 3.
substitute for turbine 1st stage pressure as the initiating signal for pemissive relay operation.
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l However, on May 3rd a plant trip was experienced which made it impossibic to collect the required test data during a plant shutdown under routine conditions. Therefore, it was resolved that the test data could be compiled during thb subsequent plant startup. To accomplish this, administrative control of pemissive relay actuated functions was provided until actmatic initiation of pemissive circuitry by use of extra licensed operating personnel with specific monitoring and action level instructions. During the plant startup, the test data indicated initiation of the automatic trips at the following loads:
25 FMe Turbine / Generator on BK-1 33 FMe Reactor 33 hMe Turbine /Cenerator on BK-2 During the loading period up to the above loads, the automatic signals not available were:
1.
Main Coolant low flow 2.
Steam Generator low level 3.
Turbine and Generator associated trip signals Evaluation of the measured #1 nozzle pressure data taken during the plant startup verifies that the noule pressure indication can be used successfully to initiate the pennissive circuitry.
In addition, a subsequent test indicated that the intended use of this pressure point is compatible with routine turbine control and throttle valve testing. A Proposed Change is being submitted to obtain approval to implement this change.
should you desire additional infomation feel frn satisfactory; however, We trust you will find this infomatio ee to contact us.
Very truly yours, Yankee Atomic Electric Company
. hi kc H. A. Autio Plant Superintendent llu
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,f,{'.p, gw y, AEC DIS 7 FJTION FOR PART 50 DOCIE? MA d,L
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'.2.'O AN E-d Yankee Atomic Electric Company Rowe, Massachusetts 01367 H. A. Aur.io 5-14-73 5-16-73 x
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ORIG CC GR SSIC AEC FD3 DL 3 signed CLASS:
U/ PRO? INFO IIiFiT2 NO CYS REC'D.
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40 50-29 DESCRIF2;C;i:
ENCLOSURES:
l'tr furnishing written report for Abnormal Occurfence No.
73-3...
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