ML20038B773
| ML20038B773 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek, Cooper, Arkansas Nuclear, River Bend, Waterford, South Texas, Comanche Peak, Fort Calhoun, Fort Saint Vrain  |
| Issue date: | 12/03/1981 |
| From: | Jay Collins 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., NEBRASKA PUBLIC POWER DISTRICT, OMAHA PUBLIC POWER DISTRICT, PUBLIC SERVICE CO. OF COLORADO, TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| References | |
| NUDOCS 8112090092 | |
| Download: ML20038B773 (2) | |
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UNITED STATE 3 gi i,
NUCLEAR REGULATORY COMMISSION
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REGION IV k
g 611 RYAN PLAZA DRIVE, SUITE 1000 o,
ARLINGTON, TEXAS 76011 Decm ber 3, 1981 Gentlemen:
The enclosed IE Infonnation Notice provides early notification of an event that may have safety significance.
Accordingly, you should review the infor-mation notice for possible applicability to your facility.
No specific action or response is requested at this time.
If you have questions regarding this matter, please contact this office.
Sincerely, John T. Collins Regional Administrator
Enclosures:
1.
IE Information Notice No. 81-36 2.
List of Recently Issued IE Information Notices
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r-IE INFORMATION NOTICE NO. 81-36:
REPLACEMENT DIAPHRAGMS FOR ROBERTSHAW VALVE j
(MODEL N0. VC-210)
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Licensee Facility / Docket Number Arkansas Power and Light Conpaiv Arkansas. Nuclear One, Unit 1 & 2 "Little Rock, Arkansas 313;'50-368 Nebraska Public Power District Cooper Nuclear Station
- Columbus, Nebraska 50-298 Omaha Public Power District Fort Calhoun Station
' Omaha, Nebraska 285 gPublic Service Comparv of Colorado Fort St. Vrain Generating Station Denver, Colorado
/ 50-267 Gulf States Utilities River Bend
' Beaumont, Texas
". Houston Lighting & Power Company South Texas Project Houston, Texas 50-498; 4 0-499 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 ComanchefeakSteamElectricStation
" Dallas, Texas
- 50-445; 1 0-446 i
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SSINS No.:
6835 Accession No.:
8107230039 IN 81-36 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 December 3, 1981 IE INFORMATION NOTICE NO. 81-36:
REPLACEMENT DIAPHRAGMS FOR ROBERTSHAW VALVE (MODEL NO. VC-210)
Description of Circumstances:
The Georgia Power Company's Hatch I facility experienced problems in early July 1981 with the Robertshaw Diaphragm Control Valve (Model No. VC-210) installed in the Terry Turbine Mechanical Hydraulic Overspeed Complex which contributed toward unreliability of the High Pressure Coolant Injection (HPCI) system.
During a routine inspection of the valve, it was discovered that the diaphragm supplied by Robertshaw was enlarged and leaking oil.
The diaphragm was replaced on July 12, 1981, and failed again on July 21 and August 11, 1981.
The cause of the failures was determined to be incompatibility of a neoprene replacement diaphragm, supplied by Robertshaw, with oil in the hydraulic overspeed complex.
Following the August 11, 1981 failure, a fabric-reinforced Buna-N diaphragm was installed. The diaphragm satisfied the following service conditions:
Compatible with the turbine oil recommended by the turbine vendor 40 psig maximum service pressure -
250 F maximum service temperature 1000 minimum cycles Replacement Buna-N diaphragms are available from Terry Corporation or through the General Electric Company.
An order placed directly with Robertshaw will result in the supply of a thin, non-reinforced neoprene diaphragm with redeced l
duty cycle life because the valves are supplied for other applications. We understand that the reinforced Buna-N diaphragm should be identified as Terry piece No. 890151A01 on the purchase order.
Also, if a replacement Robertshaw Valve (Model No. VC-210) is ordered (Terry piece No. 107282A01), it is necessary to separately order the reinforced diaphragm (Terry piece No. 890151A01).
The diaphragm is shown in the Terry HPCI Instruction Manual, Section 15-M-14, In-i struction for Robertshaw Diaphragm Control Valve No. VC-210, Figure 14, Part 4.
l This information notice on replacing diaphragms is being provided as an early notification of a potentially significant matter.
This experience with Jiaphragm failures serves as a reminder that a single material change may adversely affect safety system reliability.
Such a change may reduce service i
IN 81-36 December 3, 1981 Page 2 of 2 life or negate environmental qualification.
Each component or material change in a system important to safety should be carefully reviewed in order to assure system operability.
Recipients should review the information for..possible applicabiljty.to their facilities.
L No written response to this informat. ion notice is required.
For' additional information regarding this matter, contact the Regional Administrator of the appropriate NRC Regional Office.
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a IE Information Notice No. 81-36 December 3, 1981 LISTING OF RECENTLY ISSUED IE INFORMATION NOTICES Information Subject Date Issued To Notice No.
Issued 81-28 Failure of Rockwell-Edward 9/3/81 All power reactor facilities Main Steam Isolation Valves with an Operating License (OL) or Construction Permit (CP) 81-29 Equipment Qualification 9/24/81 All power reactor facilities with an Operating License (0L) or Construction Permit (CP) 81-30 Velan Swing Check Valves 9/28/81 All power reactor facilities with an Operating License (OL) or Construction Permit (CP) 81-31 Failure of Safety Injection 10/8/81 All power reactor facilities Valves to Operate Against with an Operating License Differential Pressure (OL) or Construction Permit (CP) 81-32 Transfer and/or Disposal of' 10/23/81 All medical licensees Spent Generators i
81-33 Locking Devices Inadequately 11/9/81 All power reactor facilities Installed on Main Steam with an Operating License Isolation Valves (0L) or Construction Permit (CP) l 81-34 Accidental Actuation of Prompt 11/16/81 All power reactor facilities i
Public Notification System with an Operating License (OL) or Construction Permit (CP) 81-35 Check Valve Failures 12/2/81 All power reactor facilities with an Operating License l
(OL) or Construction Permit (CP)
Enclosure l
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