ML19254F258
| ML19254F258 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 10/11/1979 |
| From: | MISSISSIPPI POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19254F257 | List: |
| References | |
| NUDOCS 7911070434 | |
| Download: ML19254F258 (2) | |
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INTERIM REPORT FOR REPORTABLE DEFICIENCY NO. 79/14 AS DEFINED IN 10 CFP 50.55(e)
I.
Description of Deficiency As part of the evaluation of IE Bulletin 79-01A, it was necessary t i contact our suppliers of air actuated valves to see if the solenoid valves in question were used on our valves.
In response to our in-quiry, the Henry Pratt Company sent a letter stating they had reported a potential defect with the solenoids under 10 CFR, part 21, section 206.
The problem with the solenoids is that they have a maximum rating of 5
4X10 rad integrated dosage and 200 F temperature.
Our specifications 7
require a rating of 1.6X10 rads integrated dosage and 330 F temper-ature.
These solenoid valves on the actuators are a critical part of the system as the pneumatic actuator system is designed to open the valve and hold it open when the ASCO solenoid valve is energized. When deenergized, it is designed to vent air from the cylinder to allow a heavy coil spring to close the valve and hold it closed. For example, if the ASCO solenoid valve is energized but is inoperable, with the valve in the open pocition, deenergizing the ASCO solenoid valve will not cause the valve to close.
Conversely, if the ASCO solenoid valve is deenergized but is inoperable in the closed position, energizing it will not cause the valve to open.
Af ter reviewing the function of valves using the ASCO solenoid valves in question, it has been determined that some valves are located in safety-related systems and their operation during en accident is required.
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e Office of I spection and Enforcenent October 10, 1979 U. S. Nuclear Regulatory Connission AECM-79/115 II.
Safety Implications Had this deficiency remained uncorrected, it could have adversely a'.'ected the safety operations of the plant.
In addition, it constituted a significant deficiency in the design of the valve in that the design did"not conform to the design criteria included in the purchase speci-
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fication.
III. Correcti.a Action Taken All corrective action, including action taken to prevent recurrence will be submitted to you in a final report by December 21, 1979.
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