ML20098F295
| ML20098F295 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 09/05/1984 |
| From: | Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 157, NUDOCS 8410020565 | |
| Download: ML20098F295 (2) | |
Text
2840811790 PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET P.O. BOX 8699 PHILADELPHI A. PA.19101 SEP 051984 1215)841 4502 V IC E -PR E$t D E N T e meeNtt neNG AND RESE ANCM GO-3s1P Dr. Thmas E. Murley, Director Office of Inspection and Enforement - Pagion I U. S. Nuclear Regulatory Ca mission 631 Park Avenue King of Prussia, PA 19406
Subject:
Limerick Generating Station, Units 1 & 2 Sionificant Deficiency Report No.157 (Attachment 1)
ASCO Solenoid Valves Installed on Velan Air Operated Valves NRC Construction Permit Nos. CPPR-106 and 107
Reference:
Telecon - J. P. Evans (PECo) to Jane Grant (USNRC),
dated 9/4/84 File:
QUAL 2-10-2 (SDR No. 157)
Dear Dr. Murley:
In empliance with 10CFR50.55 (e), we are subnitting our Significant Deficiency Report concerning ASCO solenoid valves installed on Velan air operated valve assmblies.
We trust tnat this satisfactorily resolves the item.
Please do not hesitate to contact us if further information is required.
Sincerely, fSh}
Copy to: Director of Inspection and Enforcenr2nt United States Nuclear Regulatory Camission Washington, DC 20555 S. Chaudhary, Resident NRC Inspector (Limerick)
JNM/pdO9048403 Attachment O
s p
I E. 27
2840811790 Linnrick Generating Station, Units 1 & 2 Significant Deficiency Report No. 157 Concerning Misapplication of ASCO Solenoid Valves 1.0 Introduction This report concerns the improper application of ASCO Solenoid valves controlling air supply to Velan air operated valves in the Limerick anergency Service Water System.
2.0 Description of Problem The existing pilot scienoid valves (ASCO Model NP344A71E) are four way valves incorporating a design that provides the capability to control double acting valve operators (i.e. - ones not provided with spring return to a designated position). The air supply to these pilot solenoids does not ensure cmplete travel of the solenoid valve piston thus permitting partial venting to the atnesphere of the air supply to the valve operator. As a result, the subject valves occasionally do not stroke when called upon to do so, as was discovered during pre-operational testing.
3.0 Corrective Action to be Taken The four way solenoid valves on all anergency Service Water valves are being replaced by three way solenoid valves which will not be subject to the condition described above. The nanual shutoff valves upstream of the pilot solenoid valves are also being replaced to increase air supply flow. The affected FSV valves will be tested to verify proper operation after the work is emplete. This work will be cmplete by Septeriber 15, 1984.
4.0 Safety Inplications Failure of pilot solenoid valves to stroke the ESW valves could result in loss of emergency service water inventory and/or loss of the required cooling water to safety related ECCS heat exchangers.
JNM/pdO9048404