ML19351E153
| ML19351E153 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 11/27/1967 |
| From: | Johnson W YANKEE ATOMIC ELECTRIC CO. |
| To: | US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML19351E155 | List: |
| References | |
| NUDOCS 8011250677 | |
| Download: ML19351E153 (1) | |
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Washington, D. C.
205h5 Attention: Division of Reactor Licensing Daar Sirs:
We are enclosing herewith for your use and infomation twenty five copies of Operation Report No. 82 covering operations at the plant for the month of Octcher,1967.
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WWIN W. P/ Johnsen s.
Manager of Operations WFJ :mj 9
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k This report covers the operation of the Yankee Atomic Electric Company plant at Rowe, Massachusetts for the month of October, 1967 At the beginning of the period the plant was operating at approximately 173 MWe.7herearter plant load varied between 169 MWe and 177 MWe as circulating water inlet temperature varied between h6 F and 61 F.
On October 17, slowly increasing steam generator chloride concentrations again indicated the presence of a main condenser tube leak.
Preparations were made for a plant load reduction and condenser tube plugging to be accomplished at approximately 2100 hours0.0243 days <br />0.583 hours <br />0.00347 weeks <br />7.9905e-4 months <br /> October 19 However, at 2015 hours0.0233 days <br />0.56 hours <br />0.00333 weeks <br />7.667075e-4 months <br /> October 19 the Z-126 115 KV line was reported to have a glowing disconnect at the Harriman Station. A lead reduction to h50 MWt was initiated.
inmediately and variouc safety procedures consistent with the single 115 KV line plant operation were implemented.
Shortly thereafter the load reducticn.was continued to 90 MWe in order to conduct the condenser tube leak test and plugging. As a result of the test four leaking tubes in the vicinity of the air intake area were found and plugged, fifteen additional tubes in the same area were also plugged as a precautionary measure. Subsequently, during the plant shutdown on October 28, the condenser was re-entered and three previously plugged tubes were re-opened for axial determination of 4?
the leak location. This was accomplished by permitting a string-captive stopper to be drawn into the tube by the condenser vacuum.
In all cases the leak was found to be within three to five feet from the circulating watcr inlet tube sheet.
By 22h5 hours October 19 the condenser nad been closed out and plant load increased to h50 MWt, tDe load still limited by difficulties on the Z-126 line which hat been isolated at 21h0 hours. At 0220 hours0.00255 days <br />0.0611 hours <br />3.637566e-4 weeks <br />8.371e-5 months <br /> the Z-126 line was reported clear and plant load increase to 600 MWt was initiated immediately thereafter.
On October b a vapor container inspection revealed that the low set pressurizer safety valve had developed minor leakage past the seat.
This was detected by feeling the near down stream piping. Leakage cannot be detected at the piping. external to the vapor container. At the end of the reporting period no increase in leak rate could be detected either by an increase in safety valve discharge piping temperature or pressurizer heater power demand.
Cleaning, inspection, and decontamination of the spent fuel pit continued throughout the reporting period.
Subsequent to the removal of both aluminum fuel storage racks, the voeden fuel rack platforms were removed and cut up for disposal.
These platforms had apparently suffered. considerable radiation damage. Although-the wood appeared to be sound it was embrittled
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and readily susceptible to fracture under minimal. transverse loadings. At the end of the period new cypress platforms were