ML19338F281
| ML19338F281 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Quad Cities, Zion, LaSalle  |
| Issue date: | 03/17/1975 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Brian Lee COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8010140680 | |
| Download: ML19338F281 (1) | |
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UNITED STATES
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NUCLEA_R REGULAVORY COlWMISSION REGION lil 799 ROOSEVELT RC AO CLEN ELLYN. ILLINO15 60137 MAR l' 7 :s73 cmmnwealth Edison Company Docket No. 50-10 ATnt: lir. Byron Lee, Jr.
Docket No. 50-237 Vice President Docket No. 50-249 P. O. Box 767 Docket No. 50-304 Chicago T111nnis 60690 Dochst No. 50-254 Docket No. 50-265 Docket No. 50-373 Docket No. 50-374 Gentlement Enclosed is IH Bulletin No. 75-03 5.tich requires action by you with regard to your power reactor facility (ias) with opera'4 licenso or construction permit.
Should you h2ve questicas regarding this Bulletin or the action required of you, nicasa contact this office.
Sincerely, James G. Keppler Ragional Director Enclosurat IE Bulletin No. 75-03 Approved by GAu, B-180213 (ROO72), clearance expires 7-31-77. Approval was given undar a blankat clearance specifically for idsntified generic problems.
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,o March 17, 1975 IE Bulletin No. 75-03 I
INCORRECT LOWER DISC SPRING AND CLEARANCE DIMENSION IN SERIES 8300 AND 8302 ASCO SOLENOID VALVES DESCRIPTION OF CIRCUMSTANCES:
Recent abnormal occurrences have been reported at the Point Beach and Kewaunee nuclear stations in which safety related solenoid air-pilot valves manufactured by Automatic Switch Company (ASCO) failed to operate properly due to an incorrect lower disc spring and/or improper lever to lower disc stem clearance.
Information contained in the reports submitted by NRC licensees and subsequent discussions between NRC and ASCO personnel j
have revealed the potential for similar failures with ASCO, 120 volt, 60 cycle solenoid valves of the types listed below.
Series Form
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8300-C F, U, RF or RU
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8302-C F, U, RF or RU According to the manufacturer, valves of the types listed above should have a heavier duty spring on the upper than on the lower disc section.
These springs are identified by a specific part number and color which may differ for each valve type.
Incorrect lower disc springs as well as improper clearance between the lever and lower valve disc stem have been identified as the causes of recent valve failures.
It has also been reported that incorrect valve discs springs have been j
included in repair kits supplied by the valve manufacturer.
In case of uncertainty, licensees are advised to contact the ASCO valve service department regrading the proper disc springs and clearance for specific valve types.
ACTION TO BE TAKEN BY LICENSEES:
For all power reactor facilities with operating license or construction permit:
1.
Determine if ASCO valves of the types described above are in use or planned for use in safety related systems.
2.
Report to this office in writing, within 30 days for facilities with operating license and within 60 days for facilities with construction permit, the results of your findings with regard to Item 1.
3.
If solenoid valves of the types described are in use or planned for use in safety related systems, include An your written reply the actions you have taken, or plan to take, to prevent failure of the type described above. Your written reply should also include the date when such' actions were, or will be completed.
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