ML20002C985
| ML20002C985 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 02/20/1970 |
| From: | Haueter R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Morris P, Skovholt D US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8101150652 | |
| Download: ML20002C985 (3) | |
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e n Avenue, Jackson, MicNgan 49201. Area Code 517788-0550 General Offices; February 20, 1970 Regulatory File Cy.
Dr. P. A. Morris, Director Re:
Docket 50-155 Division of Heactor Licensing DPR-6 ZEK United States Atemic Energy Commission Washington, DC 20545
Dear Dr. Morris:
Attention:
Mr. D. J. Ekovolt This letter is written to appraise you of the investigation and evaluation resulting from the high primary coolant conductivity incident on October 20, 1969 The unit was in the process of being started up following a short scheduled maintenance outage when, about one hour after synchro-nizing the generator, it vaa noticed that the primary coolant conductivity was increasing. At 1010 hours0.0117 days <br />0.281 hours <br />0.00167 weeks <br />3.84305e-4 months <br />, the recorder showed 10 pehos. When grab samples confirmed this higP value, a reactor shutdown was initiated at 1020 hours0.0118 days <br />0.283 hours <br />0.00169 weeks <br />3.8811e-4 months <br />.
An it=ediate investigation of the cause determined that the resins in the reactor cleanup demineralizer had decomposed due to high temperature. A fresh bed of resins was sluiced into the demineralizer and, following further cleanup of the primary coolant, the unit was re-turned to service about 28 hours3.240741e-4 days <br />0.00778 hours <br />4.62963e-5 weeks <br />1.0654e-5 months <br /> after the shutdown.
The results of the investigation are as follows:
1.
The resins had decomposed due to high temperature reactor water being drawn through the demineralizer during blowdown of the pri-mary system for swell during heatup.
2.
The operator had not been alerted to the rising conductivity due to failure of the alam circuit which operates off the recorder. This same failure also prevented the cleanup pump from tripping on high tem-perature and protecting the resin bed. Inspection of this recorder fol-loving the incident revealed that both sets of contacts operated normally with the recorder door open, but would not operate with the door closed.
This situation has been corrected.
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Dr. P. A. Morrie.
2 Dockst 50-155, DPR-6 ZEI February 20, 1970 Co*rective actions that have been instituted are as follows:
1.
Problems with the alarm and pump trip circuitry have'been corrected.
2.
The operating procedures have been reviewed and revised to require that the cleanup system be valved out whenever blowdown of the primary system is_necessary with primary system pressure above 50 psig.
Belov 50 psig, the present operating practice vill be maintained since, at low pressure, the cleanup pump head is necessary to assure adequate blowdown flow.
In conclusion, no damage to equipment resulted from this inci-dent. The actions of the operating personnel were prompt and proper, and it is felt that the corrective action taken will preclude recurrence.
Yours very truly, n
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