ML20090B514
| ML20090B514 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 05/20/1982 |
| From: | Rosztoczy Z Office of Nuclear Reactor Regulation |
| To: | Johnston W Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML082380335 | List:
|
| References | |
| FOIA-91-106, RTR-NUREG-0909, RTR-NUREG-909 NUDOCS 8206110370 | |
| Download: ML20090B514 (2) | |
Text
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r hantralFile TQU Ydg. File klAY 2 01992 MEMORANDUM FOR: William V. Johnston. Assistant Ofrector Materials and Qualification Engineering Division of Engineering FRGM:
Zoltan R. Rosztoczy, Chief Equipment Qualification Branch Division of Engineering
SUBJECT:
GENERIC REC 0fEENDATION BASED ON THE STEAM GENERATOR TUDE RUPTURE AT GINNA My staff reviewed the report (NUREG-909) on the subject incident from the point of view of the plant system response. OuFgeneric recommendation is discussed in the attactnent to this memorandtn.
kne_uagsgeeja,3 Zoltan R. Rosztoczy, Chief Equipnent Qualification Branch
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Division of Engineering
Enclosure:
As stated i
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6eneric Recommendation Based On The Steam
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Generator Tube Rupture At Ginna Division of Engineering:
Equipment Qualification Branch Plant System Response:
The malfunction of the POM for the pressurizer was caused by the solenoid valves controlling the air supply to the relief valve. The mechanical operability of a valve similar to the one in Ginna was verified through the test program recently completed by EPRI. However, a combination of air quality and flow restriction to the solenoid valve caused the relief valve to remain stuck open.
If plant modifications like the one in Ginna involving air operator fiow restriction to safety related valves are oerformed without a thorough analysis of the effects on the safety related valves, there can be a potential for significant consequences, The generic concern is that modification of air operators for safety related valves may render them inoperable. As evident from the Ginna incident, in-service inspection and testing cannot simulate the total effect of modification; and therefore, in-service inspection and testing cannot fully assure operability. A careful review should be made as to how all in plant modifications of safety related active valves compare against the manufacturer's recommendations for installation in the plant. Significant deviations from the recommended installation a
should be evaluated and appropriately dealt with.
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