ML20033A693
| ML20033A693 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek, Cooper, Arkansas Nuclear, River Bend, Waterford, South Texas, Comanche Peak, Fort Calhoun, Fort Saint Vrain  |
| Issue date: | 09/28/1981 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | ARKANSAS POWER & LIGHT CO., GULF STATES UTILITIES CO., HOUSTON LIGHTING & POWER CO., KANSAS GAS & ELECTRIC CO., LOUISIANA POWER & LIGHT CO., NEBRASKA PUBLIC POWER DISTRICT, OMAHA PUBLIC POWER DISTRICT, PUBLIC SERVICE CO. OF COLORADO, TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| References | |
| REF-SSINS-6835 NUDOCS 8111270086 | |
| Download: ML20033A693 (2) | |
Text
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s 9'o, UNITED STATES 4.
8 NUCLEAR REGULATORY COMMISSION
,I REGION IV e
611 RvAN PLAZA DRlVE, $UI,TE 1000 ARLINGTON, TEXA5 76011 Septemtier 28,1981 i
Gentlemen:
~
The enclosed IE Information Notice provides early notification of an event that may have safety significance.
It is expected that recipients will review the i
f information notice for possible applicability to their facilities.
No specific action or response is requested at this time.
If further NRC evaluations so indicate, an IE Bulletin or Circular will be issued to recomend or request specific licensee actions.
If you have any questions regarding this matter, please contact this office.
Sincerely,
. j'
- ...c l-Kar'l' V. S'eyf rit i
Director l
Enclosures:
1.
IE Information Notice No. 81-30 2.
List of Recently Issued IE Information Notices 8111270086 810928 PDR ADOCK 05000267 O
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IE INFORMATION NOTICE N0. 81-30
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Licensee Facility / Docket Number _
Arkansas Power and Light.Conpany Arkansas Nuclear One,' Unit 1 & 2 Little Rock, Arkansas 50-313; 50-368
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Nebraska Public Power District Cooper Nuclear Station Columbus, Nebraska 50-298 Omaha Public Power District Fort Calhoun Station Omaha, Nebraska 50-285-Public Service Company of Colorado Fort St. Vrain Generating Station y
Denver, Colorado 50-267 Gulf States Utilities River Bend Beaumont, Texas 50-458; 50-459 Houston Lighting & Power Company South Texas Project Houston, Texas 50-498; 50-499 Kansas Gas & Electric Company Wolf Creek Wichita, Kansas STN 50-482 Louisiana Power & Light Company Waterford-3 New Orleans, Louisiana 50-382 Texas Utilities Generating Company Comanche Peak Steam Electric Station Dallas, Texas 50-445; 50-446 e
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SSINS No. 6835 Acchssion No.:
8107230027 IN 81-30 UNITED STATED NUCLEAR REGULATORY COMMISSION 0FFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 September 28, 1981 IE INFORMATION NOTICE NO. 81-30:
VELAN SWING CHECK VALVES Description of Circumstances:
Recent occurrences with Velan swing check valves are described below.
1.
On June 30, 1981, Public Service Electric & Gas Company reported (LER 81-035/01T) that on June 6, 1981, while a leak in the bonnet of a swing check valve in the steam supply to the turbine driven auxiliary feedwater pump at Salem Generating Station, Unit 2, was being repaired, the valve.
was found to be internally damaged.
The valve is a Velan 6-in. swing check valve (Type B14-2114 B-2TS).
The valve disk stud had broken and the valve disk was in the bottom of the valve body.
The valve also had cracks in the disk, cracked bushings, a warped hinge pin, and all hinge pin holes were elongated.
The licensee inspected the corresponding swing check valve in the other steam supply line and discovered similar damage.
An inspection of the corresponding swing check valves on Unit 1 also revealed similar damage (LER 81-059/01T).
The licensee plans to radiologically examine the valves manthly until a reason for the damage can be determined.
i 2.
On July 31, 1981, Wisconsin Electric Power Company reported (LER 81-010/01T-0) that on July 14, 1981, while a check valve leakage test at the Point Beach Nuclear Plant, Unit 1, was being performed, the check valves closest to the reactor coolant system in the low head safety injection lines were found l.
to be leaking more than allowed by the leakage acceptance criteria.
The l
valves are Velan 6-in. 1500 psig ASA swing check valves (Velan Drawing l
No. 78704).
The valves were disassembled and the disks were found to be stuck in the full-open position due to interference between the disk nut lockwire (disk wire) and the valve body.
The disk nut and its shaft can rotate freely, j
l and, in certain random rotational positions, this interference is likely to occur.
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IN 81-30 September 28, 1981 Page 2 of 2 The licensee has replaced the disk wire with a cotter pin that will not cause interference with the valve body for any rotational porition.
Subsequent inspection of the other check valves in the low head ~ safety injection lines was performed.
These valves were found to be closed.
The lock wi.res were nevertheless replaced with cotter pins.
The drawing for the same valve used at the Prairie Island plant was also checked.
The drawing (Velan Drawing No. 78704) is annotated to require that the lock wire be tack welded down (so it cannot interfere with the valve body).
Because this detail is not uniform on the subject drawing and can vary from plant to plant, a verification and/or changeout on this locking device may be necessary.
Additional occurrences with Velan swing check valves are described in IE Bulletin 79-04, " Incorrect Weights for Swing Check Valves Manufactured by Velan Engineering Corporation," and in IE Information Notice 80-41, " Failure of Swing Check Valve in the Decay Heat Removal System at Davis-Besse Unit No. 1."
This information is provided as notification of a potentially significant matter.
It is expected that recipients will review the information for possible applicability to their facilities.
No specific action or response is requested at this time.
If you have questions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
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IE Information Notice No. 81-30 C
September 28, 1981 LISTING OF RECENTLY ISSUED IE INFORMATION NOTICES Information Subject Date Issued To Notice No.
Issued 81-23 Fuel Assembly Damaged 8/4/81 All power reactor due to Improper Positioning facilities with an of Handling Equipment Operating License (0L) or Construction Permit (CP) 81-24 Auxiliary Feed Pump 8/5/81 All power reactor Turbine Bearing Failures facilities with an Operating License (0L) or Construction Permit (CP) 81-25 Open Equalizing Valve 8/24/81 All power reactor of Differential Pressure facilities with an Transmitter Causes Reactor Operating License (0L)
Scram and Loss of Redundant or Construction Permit (CP)
Safety Signals.
81-26 Compilation of Health 8/28/81 All power reactor facilities Physics Related Information with an Operating License Items (0L) or Construction Permit (CP) 81-27 Flammable Gas Mixtures 9/3/81 All power reactor facilities in the Waste Gas Decay with an Operating License Tanks in PWR Plants (OL) or Construction Permit (CP) 81-28 Failure of Rockwell-Edward 9/3/81 All power reactor facilities Main Steam Isolation Valves with an Operating License (0L) or Construction Permit (CP) l 81-29 Equipment Qualification 9/24/81 All power reactor facilities l
with an Operating License (0L) or Construction Permit (CP)
Enclosure i
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