ENS 49895
ENS Event | |
|---|---|
04:00 Mar 11, 2014 | |
| Title | Part 21 - Scram Solenoid Pilot Valve Not Exhausting Properly |
| Event Description | The following was excerpted from a fax received from ASCO Valve, Inc.:
Problem Description GE Hitachi Nuclear Energy (GEH) customer Energy Northwest reported that an ASCO scram solenoid pilot valve (SSPV) Catalog number HVL266000010J 115/60, GE-H part number 107E6022P014, serial number A272718-054, CRD-SPV-118/1043 did not exhaust properly. The valve had been installed in Energy Northwest's Columbia facility for approximately 7 months and had been cycled 60-70 times. Energy Northwest's internal investigation revealed the pilot head assembly spring was not in the groove of the associated core. Conclusion Various tests were performed to rule out possible manufacturing non-conformances in the spring or core. The successful completion of these tests has established that when the spring is properly installed on the core, the spring will not come off in service. We have not yet identified any other conditions that could cause the spring to come off the core, except for improper assembly. This configuration of spring and core design was used on the original 090405 scram valve. There has not been any design change to this core assembly since its inception in 1959. This spring/core assembly makes up the bulk of ASCO core solenoid offering. It is used across all of ASCO valve ranges in the Commercial, Nuclear, Military, and Petrochemical markets. ASCO has supplied over 10 million valves to these markets over the entire product offering. This Includes over 50,000 Nuclear Qualified Valves. With the exception of the 1994 and 2012 events, a review of ASCO return records found no other cases of this condition where a spring disengaged from the core. Since ASCO does not have adequate knowledge of the actual installations and operating conditions of these valves, it was not able to be determined if this could create a 'Substantial safety hazard' as defined in 10 CFR Part 21. This information is intended to provide interim investigation results. If you have any questions, you can contact Bob Arnone at 803-641-9395.
Closure and Conclusion: Various tests were performed to rule out possible manufacturing non-conformances in the spring or core. The successful completion of these tests has established that when the spring is properly installed on the core, the spring will not come off in service. We have not yet identified any other conditions that could cause the spring to come off the core, except for improper assembly. This configuration of spring and core design was used on the original 090405 scram valve. There has not been any design change to this core assembly since its inception in 1959. This spring/core assembly makes up the bulk of ASCO core solenoid offering. It is used across all of ASCO valve ranges in the Commercial, Nuclear, Military, and Petrochemical markets. ASCO has supplied over 10 million valves to these markets over the entire product offering. This includes over 50,000 Nuclear Qualified Valves. With the exception of the 1994 and 2012 events, a review of ASCO return records found no other cases of this condition where a spring disengaged from the core. Since ASCO does not have adequate knowledge of the actual installations and operating conditions of these valves. It was not able to be determined if this could create a 'substantial safety hazard' as defined in 10 CFR Part 21. This information is intended to provide interim investigation results. If you have any questions, you can contact Bob Arnone at 803-641-9395. Notified R4DO (Hay) and Part 21 Group via email. |
| Where | |
|---|---|
| Asco Valve Incorporated Aiken, South Carolina (NRC Region 1) | |
| Organization: | Asco Valve Incorporated |
| Reporting | |
| 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component | |
| Time - Person (Reporting Time:+9 h0.375 days <br />0.0536 weeks <br />0.0123 months <br />) | |
| Opened: | Bob Arnone 13:00 Mar 11, 2014 |
| NRC Officer: | Charles Teal |
| Last Updated: | Jun 16, 2014 |
| 49895 - NRC Website | |
Asco Valve Incorporated with 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component | |
WEEKMONTHYEARENS 498952014-03-11T04:00:00011 March 2014 04:00:00
[Table view]10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component Part 21 - Scram Solenoid Pilot Valve Not Exhausting Properly 2014-03-11T04:00:00 | |