ML20215N476
| ML20215N476 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 10/29/1986 |
| From: | Sieber J DUQUESNE LIGHT CO. |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 2NRC-6-114, IEB-85-001, IEB-85-1, NUDOCS 8611060054 | |
| Download: ML20215N476 (3) | |
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"%s 2NRC 114 Beaver Valley No. 2 Unit Project Organization Telecopy (4 2 Ext.160 U. so*x"S2$"'
Oct. 29, 1986 Shippingport. PA 15077 United States Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406 ATTENTION:
Dr. Thomas E. Murley Administrator
SUBJECT:
Beaver Valley Power Station - Unit No. 2 Docket No. 50-412 IE Bulletin 85-01 Stean Binding of Auxiliary Feedwater Pumps Gentlemen:
In response to the IE Bulletin 85-01, dated October 29, 1985, the attached report is submitted regarding stean binding of auxiliary feedwater pumps.
If you have any questions regarding this submittal, please contact me or members of my staff.
DUQUESNE LIGHT COMPANY By
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[v J. D. Sieber Vice President
, Nuclear Operations RJW/ijr NR/FEEDWTR/PMP Attachment AR/NAR cc:
Mr. P. Tam, Project Manager (w/ attachment)
Mr. J. M. Taylor, Director (3) (w/ attachment)
Mr. J. Beall, Sr. Resident Inspector (w/ attachment)
Mr. L. Prividy, NRC Resident Inspector (w/ attachment)
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INP0 Records Center (w/ attachment)
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NRC Document Control Desk (w/ attachment)
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8611060054 861029 PDR ADOCK 05000412 PDR O
United States Nuclear Regulatory Commission Dr. Thomas E. Murley Stean Binding of Auxiliary Feedwater Pumps Page 2 COMMONWEALTH OF PENNSYLVANIA )
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COUNTY OF BEAVER
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, before me, a Notary Public in and for said Commonwealth and County, personally appeared J. D. Sieber who being duly sworn, deposed and said that (1) he is Vice President of Duquesne Light, (2) he is duly authorized to execute and file the foregoing Submittal on behalf of said Company, and (3) the statements set forth in the Submittal are true and correct to the best of his knowledge.
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ATTACHMENT Action Item No. 1:
The BVPS Unit 2 daily log has a space for a " hands on" check for monitoring fluid conditions of the Auxiliary Feedwater System.
The daily check has been determined to be adequate since:
(a)
The system has separate trains, therefore, backleakage through one train cannot affect availability of the other train.
(b)
Each auxiliary feedwater pap is provided with an automatic recirculation control (ARC) valve which functions as a check valve (spring-loaded) when the pep is not operating.
The spring-loaded check valve is designed to prevent back flow through.the pep, and does not depend on high differential pressure for tight shutoff.
In addition to the spring-loaded check valves, there. are two swing check valves in each dis-charge header.
Stem binding resulting from backleakage could only occur if the ARC valve and both swing check valves in series with it failed.
(c)
BVPS Unit 1, having a design.similar to that of the BVPS Unit 2 Auxiliary Feedwater System, has experienced no problems with backleakage.
(d)
Each auxiliary feedwater discharge header has an average of 147 feet of uninsul ated pipe to provide for heat dissipation, therefore, the effects of backleakage would be minimized.
Action Item No. 2:
The BVPS 491t ? Operating Maqual will have a procedure to recover the Auxiliary Feedwater System to f ull operable status should stem birgiing occur.
The Training Department has included the following topics in the auxiliary feedwater lesson pl an:
consequences of backleakage and stem
- binding, identification of sten binding, and correction _of valve leakage problems.
Action Item No. 3:
Present procedural controls for monitoring the fluid conditions within
- the BVPS Unit 2 Auxiliary Feedwater Sytem, as described in Action No.1, will remain in effect.
BVPS Unit 2 has performed a review of the BVPS Unit 2 Auxili ary i
Feedwater System in regard to stem binding, and does not recommend hard-ware modification changes since the present design does not appear to be susceptible to stem binding.
1 1
Schedule The procedures -described in the action item responses above are approved or will be developed and approved prior to fuel load at BVPS-2.
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