ML20003G469
| ML20003G469 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 04/22/1981 |
| From: | Mroczka E NORTHEAST NUCLEAR ENERGY CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| MP-1-1757, RO-81-004-01P, RO-81-4-1P, NUDOCS 8104290567 | |
| Download: ML20003G469 (3) | |
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Mr. Boyce H. Grier April 22, 1981 Director, Region I MP-1-1757 Of fice of Inspection and Enforcement U. S. Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406
Reference:
Provisional License DPR-21 Docket Number 50-245 Reportable Occurrence R0-81-04/IP Ocar Mr. Grier:
This letter is forwarded to provide prompt notification of Reportable Occurrence R0-81-04/1P as required by the Millstone Unit 1 Technical Specifications.
On April 21, 1981 at 0226 during power operation at inirty-one (31) percent of rated, the main turbine was manually tripped due to excessive 'urbine vibration and high shaft bearing temperature.
Approximately ten (10) minutes after the event, high main condenser conductivity was experienced, and the reactor was manually scrammed and isolated in accordance with emergency procedures.
The Isolation Condenser System was inoperable due to post-surveillance system draining, thereby necessitating reactor cooldown through manual operation of a main steam safety / relief valve, using the torus as a heat sink.
The core s cay y
and low pressure coolant injection systems were initiated as a precautionary measure but were not injected.
As a result of this means of cooldown, the reactor vessel cooldown rate was exceeded for one (1) hour.
An investigation of the cause of the event and incurred damage is in progress.
A detailed description and corrective action will be provided in a 14-day follow-up report.
Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY de!
E. J. Mroczka Station Superintendent Millstone Nuclear Power Station EJM/MJB:ws cc: Director, Office of Managennt Enforcement and Program Control, Washington, D.C.
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