ML20024H580
| ML20024H580 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 05/24/1991 |
| From: | Taylor J NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO) |
| To: | Lieberman J SENATE |
| Shared Package | |
| ML20024H581 | List: |
| References | |
| NUDOCS 9106050119 | |
| Download: ML20024H580 (6) | |
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UNITED STATES A,
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The' Honorable Joseph 1. Lieberman United States Senate Washington, D.C. 20510
Dear Senator Lieberman:
I am responding to your letter of May 9,1991, regarding your' concern about a_ break in a dry instrument tube during in-vessel maintenance at the Millstone Nuclear Power Station, Unit 1, on May 1, 1991.
-The event occurred during the current 2-month refueling outage at the plant.
An incore instrument-dry tube broke while being moved out of the reactor vessel.
Following the break, part of the tube attached to.the removal tool rotated in such a way as to' break the surface of the water in the refueling pool for of the Northeast Nuclear Energy Company (the licensee)posure to five workers several seconds and resulted in unplanned radiation ex
, who were present'during this activit.y.
The_ licensee analyzed'the event and found that the maximum radiation exposure that occurred to one individual was 154 millirem. However, the radiation exposures received were a small fraction of limits; far less than the 2500
-millirem that the licensee allows its workers over 3 months or the 3000 millirem maximum quarterly occupational radiation dose to the whole body permitted in the U.S. Nuclear Regulatory Comission (NRC) regulations.
In addition, no airborne contamination resulted.from the incident and thus no release of
- radioactive material occurred.
Further, all workers involved inLthe activities were provided with integrating alarming dosimeters.and the area around the refueling pool was' continuously monitored with alarming radiation monitoring equipment.
When the tube broke the water surface these alarms sounded and the workers evacuated the area.
On May 8,1991, another event occurred involving the breaking of an instrument dry tube during handling.
In this case, however, the dry tube did not break the surface of the water in the refueling-pool-'and thus resulted in no radiological consequences.
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An inspection has been cornpleted and the report will address the specific issues raised in your letter of May 9,1991.
As indicated in the May 3, 1991, telephone conversation between Ms. Pechtschaffer of your staff and Mr. Calletan of the NPC staff, we will forward the inspection report as soon as it is av a ilat> 1e.
I trust this response adequately addresses your inquiry.
Sincerely, Original Signed By:
Jame M.TaylM '
James M. Taylor Executive Director for Operations
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the inspection report es soon as it is available. The inspection report will address the specific issues raised in your May 9,1991 letter.
I trust this respcnse adequately addresses your inquiry.
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James M. Taylor Executive Director for Operations
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EDO Principal Correspondence Control FROM:
DUE: 05/28/91 EDO CONTROL: 0006506 000 DT: 05/09/91 FINAL REPLY:
Son. Joseoh I. '.ie0erman TO:
Chairman Carr FOR SIGNATURE OF:
ROUTING:
CONCERNS ABOUT A BREAK IN A TUBE DURING AN Taylor EQUIPMENT CHANGE AT MILLSTONE Sniezek Thompson DATE: 05/15/91 Blaha TMartin. RI AS'a!GNED TO:
CONTACT:
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JOSEPil LIEBl:RMAll AFFILI ATIOll' UNITED STATES SEllATE ADDRESSEE:
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May 9 91 FILE CODE: ID&R-5 MILLSTollE SUBJ ECT:
FAULTY EQUIPMENT AT Tilt MILLSTONE PLANT ACTION:
Direct Reply D.t STRIBUTIO!11 CilAIRMAN, OCA TO ACK, DS 13, RF SPECI AL !!ANDLI!1G: nolle NOTES:
DATE DUE:
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