ML20127G392
| ML20127G392 | |
| Person / Time | |
|---|---|
| Site: | Monticello, Prairie Island  |
| Issue date: | 10/25/1974 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Wachter L NORTHERN STATES POWER CO. |
| References | |
| IEB-74-12, NUDOCS 9211160582 | |
| Download: ML20127G392 (1) | |
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UNITED STATE 3 ATOMIC ENERGY COMMISSION l
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DIRECTOR ATE OF REGULATORY OPER ATIONS REGION i11 799 ROOSEVELT ROAO vaur*+oses GLEN ELLYN, ILLINOIS 60137 Q12) 454-2640 OCT 2 5 1974 Northern States Peoer Ceapany Dooket No. 50-243 AfrN: Mr. Lee unekter Doeket no. 50-242 Vies Praafdant Dookat No. 50-506 t
l Power Production and system Operaties 414 Nieo11st Mall Nimatapolis, ut==amata 54401 Gentisment The enclosed 30 Bulletia No. 74-12. "Insorrest Coils in Westinghomas Type 50 Relays," is sent to provide you with information reported by Portland General Electria Company as a deficiamey identified at the Trojan remeter facility.
This informatiaa may have applisability to your facilities. Action requested on your part is identified la Sestime B of the analosed l
Bu11stia.
staaer.1y, Jamse G. Kappler Regional Direeter Enclosures 20 Bulletin No. 74-12 bec Central Files RO Files PDR Local PDR l
OGC Beth P-506A A. Roisman 9211160582 741025 PDR ADOCK 05000263 G
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October 25, 1974-DRO Bulletin No. 74-12 INCORRECT COILS IN WESTINGHOUSE TYPE SG RELAYS AT TROJAN We recently received information from the Portland General Electric Company describing incorrect relay coils supplied as component parts of the 4kV and 12kV switchgear that were discovered during preoperational testing at the Trojan nuclear power plant. The information provided is as follows:
A.
Description of Circumstances Eleven (11) Westinghouse type SG293-B255A20 relays supplied by ITE in the 4kV and 12kV switchgear were determined to have incorrect coils during Trojan field preoperational testing. The relays were found to have 48V de coils rather than 125V de coils.
The resistance of 48V de coils is 725 ohms; the resistance.of 125V de coils is 4650 ohms. The relays were found to have been labeled incorrectly as being 125V de relays by the subvendor, Westinghouse.
Five of the 11 incorrect relays are-located.in engineered safety features (ESF) circuits - three of which (27-A1, 27-D1, 27-D2) are potential monitor relays whose only function is to alarm; the other two (162-108X and 162-208X) perform an ESF function. The licensee's evaluation showed that these relays with 48V de coils could fail in-either of two ways - burn open or short to ground when subjected to 125V dc.
B.
Action Requested of Licensees It is requested that you notify this office:in writing within 30 days:
(1) whether or not similar circumstances or the potential-for similar circumstances described above exist at your facilities for Class IE equipment, or (2) the date(s) when action to determine whether similar circumstances exist will be completed.- If the~
i findings as a result of the action above-indicate _ that similar circumstances exist, the specific findings together with a descrip-tion of the corrective-action taken or planned, including the l
scheduled completion date of planned corrective action, should be submitted to this office-within 30 days of the findings.
If there are no such relays at your facilities a negative report is requested.
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