ML19260D700
| ML19260D700 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 12/18/1979 |
| From: | Dale L MISSISSIPPI POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19260D675 | List: |
| References | |
| NUDOCS 8002110610 | |
| Download: ML19260D700 (3) | |
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1 REPORT FOR REPORTABLE DEFICIENCY NO. 79/15 AS DEFINED IN 10 CFR 50.55(e)
I.
Description of Deficiency As part of the evaluation of IE Bulletin 79-01A, it was necessary to 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 4X105 rad integrated dosage and 2000 F temperature.
Our specifica-7 tions require a rating of 1.6X10 rads integrated dosage and 330 F temperature.
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 solennd 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 position, 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 nAJ 253 scou ro
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(2) during an accident is required.
II.
Safety Implications The deficiency constituted a significant deficiency in the design of the valve in that the design did not conform to the design cri-teria included in the purchase specification.
III. Corrective Action Taken The problem was found to be limited to six active valves in the re-actor containment. The defective ASCO solenoid valves will be replaced with the solenoid valves which comply with all applicable requirements.
Additienal details of our corrective actions will be summarized in Bechtel's MCAR-55 and will be available for your review at the Grand Gulf Nuclear Station construction site.
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.MP6L QUALITY AS3CFA::CE RE'.'!E' SHEE!
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Review Due Date:
Part II To be completed by Reviewer (s) approved by:
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