ML20128M782
| ML20128M782 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 02/12/1993 |
| From: | Gibson D BW/IP INTERNATIONAL, INC. (FORMERLY BYRON JACKSON |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| REF-PT21-93 CFRN-9301, NUDOCS 9302220271 | |
| Download: ML20128M782 (4) | |
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E BW/IP International, Inc.
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- f 3 gg 7 r, Pumps r' ump Osvision 12 February 1993 U. S. Nuclear Regulatory Commission Attn
Document Control Desk Washington, D. C.
20555 Gentlemen:
This letter transmits a notification of defects and nonconformances required by 10CFR - Part 21.
The attached notification, CFRN-9301, reports a condition which occurred at Texas Utilities, Comanche Peak Steam Electric Station.
Very trtily yours,
P 1
M,4 w D. A. Gibson Manager Nuclear Products Operations DAG/ah
- Attach, cc:
Mr. K. B. Lemmon, Manager, Field Service Operations Mr. R. D. Ham, Manager of Quality Mr. F. Costanzo, Manager of Engineering Mr. K. A. Huber, Technical Liaison Mr. W. A. Klenner, Product Mar.ager 2200:o l
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'9302220271 930212 PDR ADOCK 05000445 S
PDP
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10 CFR PART 21 NOTIFICATION l
(Reference No._CFRN 9301) 4 i
NAME AND ADDRESS OF THE INDIVIDUAL OR INDIVIDUALS INFORMING THE COMMISSION:
a j
Mr. D. A. Cibson BW/IP International, Inc.
Pump Division Los Angeles Operation i
2300 E. Vernon Avenue i
Vernon, CA 90058 j
(213) 587-6171 r
For Technical Information
Contact:
Dr. Kent Huber i
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IDENTIFICATION OF THE FACILITY, THE ACTIVITY, OR THE BASIC COMPONENT SUPPLIED FOR SUCH FACILITY OR SUCH ACTIVITY WITHIN THF. UNITED STATES WHICH FAILS TO COMPLY OR CONTAINS A DEFECT:
Texas Utilities, comanche Peak Steam Electric-Station.
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Basic Component: 4-inch 150# Bolced Bonnet Swing Check Valve BW/IP Part No. 75580 j
TU Tag Nos. 20C-0697 & 2CC-0693 i
l IDENTIFICATION OF THE FIRM CONSTRUCTING THE FACIT.ITY OR SUPPL' RING'THE-l BASIC COMPONENT WHICH FAILS TO COMPLY OR CONT /. INS.\\ DEFECT:
BW/IP International, Ine-.
Successor to:
i Borg-Warner Nuclear Valve Division 7500 Tyrone Avenue Van Nuys, CA 91409 l
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l 10 CFR, Part 21, Notification i
(Ref. No. CFRN-9301) t NATURE OF THE DEFECT OR FAILURE TO COMPLY AND THE SAFETY HAZARD WHICH l
IS CREATED OR COULD BE CREATED BY SUCH DEFECT OR FAILURE TO COMPLY:
Valve 20C-0697 did not fully close during pre-operational testing. Radiographs taken at the time of failure show the disk positioned at approximately 210 from the full closed position. The valve was disassembled.
The top of the disk was found to be lodged under the seat lip preventing full closure.
Valve 2CC 0693 subsequently failed testing in a similar manner.
Both valves are located in the Component Cooling Water return lines from the Reactor Coolant Pump Motor Coolers.and do not j
serve an active safety function.
However the failure mechanism could apply to other valves that do provide a safety function.
Evaluation of the basic component by BW/IP fi dicates the root cause of the failure to close is due to the configuration of the attachment weld between the disk to the stud.
Prior to 1977, this weld was placed on the back surface of the stud and l
extended into the bushing bore.
In disks manufactured after 1977, the weld was recessed into the back surface of the disk and a-final machine cut made to assure a flush surface.
1 THE DATE ON WHICH THE INFORMATION OF SUCH DEFECT OR FAILURE TO COMPLY.
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WAS OBTAINED:
The incident was initially reported to BW/IP on~18 December 1992. Additional information has-subsequently been supplied by_
Texas Utilities.
4 IN THE CASE OF A BASIC COMPONENT WHICH CONTAINS A DEFECT OR FAILS TO COMPLY, THE-NUMBER AND LOCATION 0F ALL.SUCH COMPONENTS IN USE AT, SUPPLIED FOR, OR BEING SUPPLIED FOR ONE OR *t0RE FACILITIES OR ACTIVITIES SUBJECT TO THE REGULATIONS IN THIS PART:
This notice applies to all BW/IP 4-inch, 150#, bolted bonnet swing check valves which have a raised disk-stud retention weld on the back surface of the disk.
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10 CFR, Part 21 Notification 1
(Ref. No. CFRN 9301)
THE CORRECTIVE' ACTION WHICH HAS BEEN, IS BEING, OR WILL BE TAKEN; THE 3
l NAME OF THE INDIVIDUAL OR ORGANIZATION RESPONSIBLE FOR THE ACTION; AND l
THE LENGTH OF TIME THAT HAJ BEEN OR WILL BE TAKEN TO COMPLETE THE ACTION:
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Correctivo action is complete with the disk design modification identified above.
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4 ANY ADVICE RELATED TO THE DEFECT OR FAILURE TO COMPLY ABOUT THE FACILITY, ACTIVITY, OR BASIC COMPONENT THAT HAS BEEN,1S BEING, OR I
VILL BE GIVEN TO PURCHASERS:
4 1
i Licensees with valve installations effected by this notice should install a new disk component or refurbish the existing disk.
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