ML20129H613
| ML20129H613 | |
| Person / Time | |
|---|---|
| Site: | Hope Creek  |
| Issue date: | 07/16/1985 |
| From: | Mittl R Public Service Enterprise Group |
| To: | Butler W Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8507190267 | |
| Download: ML20129H613 (3) | |
Text
i Public Senace PS G Company Electnc and Gas 80 Park Plaza, Newark, N J 07101/ 201430-8217 MAILING ADDRESS / P.O. Box 570, Newark, NJ 07101 Robert L. Mitti General Manager Nuclear Assurance and Regulation July 16, 1985 Director of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue Bethesda, Maryland 20814 Attention:
Mr. Walter Butler, Chief Licensing Branch 2 Division of Licensing Gentlemen:
RESPONSE TO PVORT OPEN ITEM 1.A.
HOPE CREEK GENERATING STATION DOCKET NO. 50-354 Pursuant to the NRC PVORT/SQRT audit held at the Hope Creek Generating Station on May 7-10, 1985, Public Service Electric and Gas Company (PSE&G) hereby submits response to PVORT Open Item 1.A - Service Water Pump (AD-502) Event.
This issue concerns determination of the precise cause of the diminished seal water leakoff flow experienced by service water pump.
Response to the remaining concerns associated with this issue; namely, safety of system design and adequacy of pump instrumentation, will be submitted to the NRC by July 31, 1985.
Should you have any questions in this regard, please contact us.
Very truly yours, l
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ATTACHMENT PVORT AUDIT OPEN ITEM - 1.A SERVICE WATER PUMP ( AD-50 2 ) EVENT The diminished seal water leakoff flow for the subject pump was the result of only one of two cyclone separators in ser-i vice and improperly packing the pump.
The pumps are l
designed to operate with bearing and seal water flow from the discharge of two parallel cyclone separators supplying a common inlet header.
When the pump was secured and the separators removed to check for obstructions, it was dis-covered that one of the separators had a blank installed on its discharge.
The other separator had some debris accumulated over the dirty water discharge, however, it cannot be determined if this was obstructing clearwater flow to the seals because of unrelated packing problems.
A decision was made to install a temporary modification to switch the seal water supply from service water to clean water off the fire water system and to bypass the separators.
The scored packing was removed and replaced using the same bevel type cut on the rings.
When the pump was restarted, there was inadequate seal leakoff flow and the packing gland overheated again even with a clean seal water supply.
The packing was changed again, and it was noted that the packing retaining ring may have been slightly cocksi.
New packing was installed but the cut on the rings was switched to a square cut.
The pump was placed in service and operated acceptably with an adequate leakoff flow.
This change was made to the other pumps.
Since these events occurred, the temporary modification has been removed and the seal water supply is back to its orig-inal configuration from the Service Water System feeding two cyclone separators.
The system has been operated per design with no problems with packing gland temperature or leakof f flow.
DJD:dh 7/16/85 MF 2 04
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