ML20084D972
| ML20084D972 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 05/26/1995 |
| From: | Miller D NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES SERVICE CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| MP-95-170, NUDOCS 9506010275 | |
| Download: ML20084D972 (1) | |
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Northead Rope Ferry Rd. (Route 156), waterford, CT 06385 Nuclear Energy Minstone Nuclear Power Station Northeast Nuclear Energy Company P.O. Box 128 waterford, CT 06385-0128 (203) 447 - 1791 Fax (203) 444-4277 The Northeast UtDities System Docket No. 50-423 RE: 10CFR50.36 2
U. S. Nuclear Regulatory Commission h9557 Attention: Document Control Desk Washington, D. C. 205555S j
Millstone Nuclear Power Station, Unit No. 3 Seismic Moritorino Instrumentation Ooerabilltv l
This Special Report is being submitte,d pursuant to Millstone Unit 3 Technical Specification 3.3.3.3.a, Seismic Monitoring Instrumentation. This Specification requires a Special Report to the NRC within 10 days following one or more of the seismic monitoring i
instruments shown in Table 3.3-7 being inoperable for more than 30 days. This report outlines the cause and the plans for restoring the instrument to operable status.
The plant shut down for a refueling outage April 14,1995. On April 16,1995, at 2050, with l
the plant in Mode 5 (Cold Shutdown) at 0% power, and 185 degrees Fahrenheit, the Seismic Monitoring System (SEI) was declared inoperable for an Automated Work Order (AWO) action. The work Involved a plant modification to relocate a seismic triaxial peak accelerograph to a different location on the Containment Safety injection Accumulator Tank. The Technical Specification Limiting Condition for Operation 3.3.3.3.a was entered on April 16,1995. However, no work was actually done to make the seismic instrument inoperable until May 16,1995. During this 30-day interval, the instrument remained Installed and capable of performing its function, although declared administratively inoperable.
On May 16,1995, the seismic monitoring system was taken out of service for instrument calibrations. The total period of time the detector was declared inoperabMor a work order, followed by the monitoring system being out for calibration, exceedeo V) days.
Prior to start-up from the current refueling outage, the detector will be restored to operable status in its new location.
The Licensee contact for this Special Report is Michael Yackoski, who may be contacted at (203)447-1791 (X4557).
Very truly yours, NORTHEAST NUCLEAR ENERGY OMPANY I
. Y Donald. Millor, Jr.
Senior Vice President-N illstone Station DBM/RLM:ljs cc:
T. T. Martin, Region l Administrator R D. Swetland, Senior Resident inspector, Mihstone Unit Nos.1,2, and 3 V. L. Rooney, NRC Project Manager, Millstone Unit No. 3 9506010275 950526 PDR ADOCX 05000336 S
PDR t
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