ML19257D653
| ML19257D653 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 01/04/1980 |
| From: | Dunn C DUQUESNE LIGHT CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-78-04, IEB-79-28, NUDOCS 8002050257 | |
| Download: ML19257D653 (3) | |
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January 4, 1980 United States Regulatory Commission Attention:
Boyce H. Grier, Director Region I 631 Park Avenue King of Prussia, Pennsylvania 19406
Reference:
Beaver Valley Power Station, Unit No. 1 Docket No. 50-334 License No. DPR-66 Response to IE Bulletin 79-28
Dear Mr. Grier:
We have reviewed IE Bulletin 79-28 concerning the installation of NAMC0 EA-lo0 limit switches equipped with top cover gaskets which potentially can malfunction due to continuous exposure to elevated temperatures. At Beaver Valley several NAMCO EA-180 switches were installed in accordance with the requirement of IE Bulletin 78-04.
Included in Table I (attached) is a listing of all safety related equipment on which the subject switches are installed.
In each case the antches are in containment installed on safety related valves and serve as valve position indicating circuitry.
Serial numbers on the conduit boss of each switch housing have been visually observed and show the four digit number to be 08-78.
This same number aopears on the NAMCO limit switches which are in stock.
Stores and Station Maintenance personnel have been alerted of the potential problems with NAMCO EA-180 switches fabricated between 02-79 and 08-79 and have been instructed to not receive or instail NAMCO limit switches of this vintage.
We are presently in full compliance with the requirements of the reference bulletin and no further corrective action is required.
Very truly yours, O t,/ ((.
C. N. Dunn Vice President, Operations Attachment 1873 253 800205U E57
-a, TABLE I NAMCO EA-180 Limit Switches Installed on Components At Beaver Vallev Unit No. 1 Valve No.
Description 1.
TV-SI-101-2 N2 Supply Manifold to SI Accumulator Valve 2.
TV-CH-200A Regenetive Heat Exchanger Discharge Valve 3.
TV-CH-200B Regenetive Heat Exchanger Discharge Valve 4.
TV-CH-200C Regenetive Heat Exchanger Discharge Valve 5.
TV-CC-105D1 Reactor Coolant Pump Component Cooling Outlet Valve 6.
TV-CC-111D1 CRDM Shroud Cooling Water Discharge Valve 7.
MOV-RC-591 "A" Loop Cold Leg Isolation Valve 8.
MOV-RC-593 "B" Loop Cold Leg Isolation Valve 9.
MOV-RC-595 "C" Loop Cold Leg Isolation Valve 10.
MOV-RC-590 "A" Loop Hot Leg Isolation Valve 11.
MOV-RC-596 "B" Loop Hot Leg Isolation Valve 12.
MOV-RC-594 "C" Loop Hot Leg Isolation Valve 13.
MOV-RC-585 "A" Loop Isolation By-Pass Valve 1873 254
A TABLE I (continueg 14.
MOV-RC-586 "B" Loop Isolation By-Pass Valve 15.
MOV-RC-587 "C" Loop Isolation By-Pass Valve 16.
MOV-SI-865A SI Accumi'.ator Discharge Valve 17.
MOV-SI-865E SI Accumulator Discharge Valve 18.
MOV-SI-865C SI Accumulator Discharge Valve 19.
LCV-CH-460A Regenetive Heat Exchanger Inlet Valve 20.
LCV-CH-460B Regenetive Heat Exchanger Inlet Valve 21.
TV-NS-101 Neutron Shield Tank Cooling Water Valve 22.
PCV-RC-455C Pressurizer Relief Valve 23.
PCV-RC-456 Pressurizer Relief Valve 1873 255