05000336/LER-1982-019, Forwards LER 82-019/99X-0.Detailed Event Analysis Encl

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Forwards LER 82-019/99X-0.Detailed Event Analysis Encl
ML20054L009
Person / Time
Site: Millstone Dominion icon.png
Issue date: 06/28/1982
From: Mroczka E
NORTHEAST NUCLEAR ENERGY CO.
To: Haynes R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20054L010 List:
References
MP-2-5221, NUDOCS 8207070065
Download: ML20054L009 (2)


LER-2082-019, Forwards LER 82-019/99X-0.Detailed Event Analysis Encl
Event date:
Report date:
3362082019R00 - NRC Website

text

'

NORTHEAST UTILITIES 1 '

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June 28, 1982 MP 5221 Mr. Ronald C. Haynes Regional Administrator, Region I Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406

Reference:

Facility Operating License No. DPR-65 Docket No. 50-336 Reportable Occurrence R0-50-336/82-19/99X-0

Dear Mr. Haynes:

This letter forwards Licensee Event Report 82-19/99X-0. While not required by the Millstone 2 Appendix A Technical Specifications, this Licensee Event Report is submitted as an informational report.

An additional three copies of the report are enclosed.

Yours truly, NORTHEAST NUCLEAR ENERGY COMPANY ay' i E J. Mroczka

) Station Superintendent Millstone Nuclear Power Station EJM/JP:mo l

l

Attachment:

LER R0-82-19/99X-0 cc: Director, Office of Inspection and Enforcement, Washington, D.C. (30)

Director, Office of Management Information and Program Control, Washington, D.C. (3)

U.S. Nuclear Regulatory Conmission, c/o Document Management Branch, Washington, D.C. 20555 1 < .

l e 1

l .

l ATTACHMENT TO LER 82-19/99X-0 NORTHEAST NUCLEAR ENERGY COMPANY MILLSTONE NUCLEAR POWER STATION - UNIT 2 FACILITY OPERATING LICENSE NUMBER DPR-65 DOCKET NO. 50-366 Event Description and Probable Consequences A higher than normal concentration of Iodine 131 in the reactor coolant system at Millstone 2 indicates probable fuel cladding defects. The first significant indication was following the reactor trip on April 17, 1982. This was approx-imately one month following the Cycle 5 refueling startup. The peak I-131 concentration following startup from the April.17 trip was .1 uCi/ml with a subsequent equilibrium value of .05 uCi/ml several days later. A second event occurred on June 3, 1982. During a steady state run at 100% power, the I-131 concentration doubled over a one day period to a peak value of .121 pC1/ml.

Several days later the I-131 concentration had returned to about .05 pCi/ml.

Current estimates have indicated that about 10 to 30 fuel rods have defects.

There is currently no reliable estimate as to which batch of fuel is affected.

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