ML20137P620
| ML20137P620 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 01/24/1986 |
| From: | Romberg W NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| MP-8655, NUDOCS 8602050277 | |
| Download: ML20137P620 (1) | |
Text
r-NORTHEAST tml.mES P o Box 270
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HARTFoHo, CONNECTICUT 06101 (703) 666-6911 w...w.m.
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January 24, 1986 MP-8655 Dr. Thomas Murley U. S. Nuclear Regulatory Commission Regional Administrator Region 1 631 Park Avenue King of Prussia, PA 19406
Reference:
Facility Operating License No. NPF-44, Docket No. 50-423
Dear Dr. Murley:
Containment Area High Range Radiation Monitors This Special Report is being submitted within fourteen days pursuant to Plant Technical Specifications
- 3. 3. 3.6.C and 6.9.2.
Plant Technical Specification 3.3.3.6.C requires that a Special Report be submitted to the NRC if less than the two required operable channels for containment area high range radiation monitoring are operable during Mode 3.
The plant entered Mode 3 with one channel for containment area high range radiation monitoring operable on January 15, 1986.
Portions of the mineral insulated cables for the system failed the voltage withstand test required by the manufacturer's preoperational testing procedure.
The defective cables were removed and returned to the supplier for rework. One detector was relocated to make use of an acceptable shorter length cable.
This provided one operable channel (Train A) for containment area high range radiation monitoring.
Plant procedures were revised to provide an alternate method of monitoring using the 5
purge area radiation monitors or, if offscale (greater than 10 R), a grab sample using the Post Accident Sampling System.
As corrective action, an additional complete channel has been purchased from a different vendor.
All work activities related to the new design within t.he Containment Building have been completed. The second channel will be completed by April 30,1986.
The Licensee contact for this Special Report is Associate Engineer Thomas Cleary who may be reached at (203) 444-5571.
Yours truly, NORTilEAST NUCLEAR ENERGY COMPANY 0602050277 060tg4 PDP ADOCK ODOOO4P3 G
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Wayne D. Romtwrg Station Superintendent Millstone Nuclear Power Station WDR/TC: pdm I
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