ML20215H942
| ML20215H942 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 04/08/1987 |
| From: | Carey J DUQUESNE LIGHT CO. |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 2NRC-7-072, 2NRC-7-72, 87-05, 87-5, NUDOCS 8705070158 | |
| Download: ML20215H942 (3) | |
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'At3 2NRC-7-072 (412)393-7546 Beaver Valley No. 2 Unit Project organization Telecopy (412) 393-7889 sgoBygns April 8, 1987 g,
Shippingport, PA 15077 l
United States Nuclear Regulatory Commission Region 1 631 Park Avenue r,frg sd sv,h G 19406 l
ATTENTION:
Dr. ihomas E. Murley Administrator f
SUBJECT:
Beaver Valley Power Station - Unit No. 2 Uocket No. 50-412 Soft Copper Tubing Connected to 50V's on Category 1 Control Valves Potential Significant Deficiency Report 87-05 Gentlemen:
This Potential ly Reportable Significant Deficiency Report is being submitted pursuant to the requirements of 10CFR50.55(e).
It is anticipated that no additional reports will be required.
DUQUESNE LIGHT COMPANY By at J. J. C4, rey
/)
Sr. Vice President 1
LMR/ijr NRC/LMR/SDR/8705 Attachment l
AR/NAR cc:
Mr. P. Tam, Project Manager (w/a)
Mr. J. M. Taylor, Director (3) (w/a)
Mr. J. Beall, Sr. Resident Inspector (w/a)
Mr. L. Prividy, NRC Resident Inspector (w/a)
INPO Records Center (w/a)
NRC Document Control Desk (w/a) 870507015e 8704og l
{DR ADOCK 05000412 PDR fE'..) 1
m
, y ATTACHMENT 1.
Summary As a result of a common Construction practice for maintaining internal cleanliness and from improper interpretation of a Field Construction Procedure (FCP), short lengths of soft copper tubing and a swagelok -
elbow were connected to the vent port of solenoid valves (SOVs) on Category I control valves.
This arrangement was not authorized by.
Engineering, nor was it identified as being temporary.
2.
Immediate Action Taken When the condition was discovered on two valves during a Stone &
Webster Engineering Corporation (SWEC) Engineering Assur ance (EA)
Audit, SWEC _ Engineering requested Site Quality Control (SQC) to inspect al l Category I control valves with S0Vs.
SQC performed a special inspection which found that of the 139 Category I control valves wi th SOVs, 74 had unmarked temporary tubing and fittings installed in the vent ports.
These were subsequently removed.
Mr.
L.
M.
Rabenau, Lead Compliance Engineer, Beaver Valley Power Station Unit No. 2, contacted W. Lowell Tripp, NRC Region 1, of this concern on March 9,1987.
3.
Description of Deficiency Construction forces misinterpreted FCP-201, " Cleaning and Maintaining the Cleanliness for Piping, Tubing, and Associated Components," and installed copper tubing with fittings in the vent port of S0Vs on some Category I control valves.
This was done in accordance with common Construction practice, but was not authorized by the._ Engineers, nor was it identified as being temporary.
A concern exists that acciden-l tal bending or crimping of the copper tubing could restrict air flow i
through the 50V from the control valve's diaphran, thereby defeating the functioning of the control valve.
4.
Analyses of Safety implication if the tubing were to be left in place during Plant Operation, crimp-ing of the vent line could increase the valves stroke time or prevent the valve from opening.
Since these valves are safety-related Cate-gory I equipment, impeding the proper function of the control valves could impact safe operation of the plant.
5.
Corrective Action Taken to Resolve the Deficiency The improper tubing and fittings were renoved. FCP-201 was revised to provide instructions for construction personnel with respect to the installation and removal of temporary fittings and tubing on SOVs.
All temporary items of this type are to be identified as temporary in accordance with FCP-14, " Identification of Temporary Installations."
Tempor ary items are permitted to be in pl ace until testing is complete.
ATTACHMENT (continued) 6.
Additional Report No additional reports are expected.
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