ML20211P671
| ML20211P671 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 12/10/1986 |
| From: | George Thomas PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-85-001, IEB-85-1, IEIN-84-06, IEIN-84-6, SBN-1254, NUDOCS 8612190117 | |
| Download: ML20211P671 (2) | |
Text
a T.s George S. Thomas Vloo Preedent Nuclear Produc#on December 10, 1986 SBN-1254 New Hampshire Yankee Division T.F. B7.1.2 United States Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, FA 19406 Attention:
Dr. Thomas E. Murley, Jr.
Regional Administrator
References:
(a) Operating License NPF-56, Docket No. 50-443 (b) Construction Permit CPPR-136, Docket No. 50-444 (c) IE Bulletin 85-01 " Steam Binding of Auxiliary Feedwater Pumps" dated October 29, 1985 Subj ect :
Response to IE Bulletin 85-01
Dear Sir:
In response to IE Information Notice 84-06 and IE Bulletin 85-01, the Seabrook Station emergency feedwater system was reviewed to determine its susceptibility to pump steam binding resulting from check valve backleakage.
The Seabrook emergency feedwater system piping configuration is similar to the typical AFW schematic diagrammed in IE Information Notice 84-06.
As a result of our study, it was determined that each of four emergency feedwater discharge headers would be periodically monitored for signs of temperature increase indicative of check valve back1cakage during times when the emergency feedwater system is required to be operable. As currently provided for in plant procedures, a temperature reading is taken using a surface contact pyrometer on the outside surface of each EFW Cischarge header by shift operating personnel and logged every four hours during Operational Modes 1, 2 and 3.
A procedure was placed in effect on April 30, 1986, which ensures that, upon receiving indication from the temperature readings that check valve back leakage may be occurring, steps are taken to prevent pump steam binding. The procedure specifles actions such as venting the pump casing and conducting the pump surveillance test necessary to ensure that the emergency feedwater system remains operable. Although these procedural steps are designed to prevent steam binding, they are equally effective in restoring pump operability should steam binding occur.
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P.O. Box 300. Seabrook, NH 03874. Telephone (603) 474 9574 i
TC 4
United States Nuclear Regulatory Commission December 10, 1986 Attention:
Dr. Thomas E. Murley Page 2 Should you have any questions regarding this matter, please contact Mr. Warren J. Hall at (603) 474-9574, extension 4046.
Very truly yours, c3/
George S. Thomas cc: Atomic Safety and Licensing Board Service List Original to: United States Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 STATE OF NEW HAMPSHIRE Rockingham, ss.
December 10, 1986 Then personally appeared before me, the above-named George S. Thomas who, being duly sworn, did state that he is Vice President-Nuclear Production of Public Service Company of New Hampshire, and that the statements therein are true to the best of his knowledge and belief.
b N OA4 Beverly E d il10way, Notaryck blic My Commission Expires: March 6, 1990