ML20033A699
| ML20033A699 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek, Cooper, Arkansas Nuclear, River Bend, Waterford, South Texas, Comanche Peak, Fort Calhoun, Fort Saint Vrain  |
| Issue date: | 10/08/1981 |
| From: | Seyfrit K, 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 8111270111 | |
| Download: ML20033A699 (2) | |
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8 NUCLEAR REGULATORY COMMISSION o
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~ REGION IV 611 RYAN PL,AZA CGIVE, SUITE 1000
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,g"q ARLINGTON. TEXAS 75011
October $8,1981 4
Gentlemen:
The enclosed IE Infonnation Notice provides early notification of an event that may have significance.
Accordingly, you shoul;f review the information notice for possible applicability to your facility.
No specific action or response is requested at this time; however, contingent upon the results of further staff evaluation, a bulletin or circular recom-mending or requesting specific licensee actions may be issued.
If you have questions regarding this matter, please contact this office.
Sincerely,
.<W/0 M Karl V. Seyfrit Director
Enclosures:
1.
IE Infomation Notice No. 81-31 2.
List of Recently Listed IE Infomation Notices 8111270111 811008 PDR ADOCK 05000267 0
IEnd &l-3; IE INFORMATION NOTICE N0. 81-31 Licensee Facility / Docket Number Arkansas Power and Light.Conpany Arkansas Nuclear One,' Unit 1 & 2 Little Rock, Arkansas 50-313; 50-368 Nebraska Public Power District Cooper Nuclear Station Columbus, Nebraska 50-298 0maha Public Power District Fort Calhoun Station Omaha, Nebraska 50-285 Public Service Company of Colorado Fort St. Vrain Generating Station 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
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6835 Accession No.:
8107230032 IN 81-31 UNITED STATES NUCLEAR REGULA10RY COMMISSION 0FFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 October 8, 1981 INFORMATION NOTICE N0. 81-31:
FAILURE OF SAFETY; INJECTION VALVES TO OPERATE AGAINST DIFFERENTIAL PRESSURE Description of Circumstances:
Both trains of the San Onofre Unit 1 safety injection system were found to be inoperable when challenged under actual operating conditions on September 3, 1981.
Following manual reactor trip from 88% power due to steam generator flow and level oscillations caused by a regulated power supply failure, low primary system pressure caused a safety injection initiation signal.
The licensee reported that operators dispatched to the auxiliary building following the safety injection initiation signal found that neither of the safety injection valves, located in the discharge of both trains of the safety injection pumps, had opened as required.
There were no adverse consequences in this particular event since there was no loss of coolant accident.
The reactor pressure remained above the safety injection pump's shutoff head and therefore no actual injection of water would have occurred if the valves had opened.
However, had react.or pressure decreased and actual injection been required, injection flow would not have been automatically available as designed.
The valves which failed to open are 14-inch Anchor Darling, Series 600, stain-less steel, Part No. SI-50-WDD valves using Greer Hydraulics No. 832210 actuators.
Tests were conducted on these valves in the as-found condition following this event and both valves failed to open against t.he 1,200 psi differential pressure which would normally exist across the valves following a safety injection signal.
Pressure was lowered until one valve opened with a 520 psid and the other at 80 psid.
Subsequent tests were performed after readjusting the valve packing to determine the cause of the failure.
These tests also failed to provide con-sistent opening against a 1,200 osid.
System modifications and further testing is under way to provide the necessary reliability for the safety injection system.
These valves had been regularly tested at each refueling outage, but the tests were not required to be performed with differential pressure across these valves.
There may be systems and components at other facilities that are not periodical-ly tested under the differential pressure conditions at which they are designed to operate.
Consequently, we suggest that recipients of this notice take appro-priate steps to determine whether or not situations similar to the above could exist at the recipients' plant (s).
IN 81-31 October 8,.1981 Page 2 of 2 This IE Information Notice is provided as an early notification of a significant~
safety matter that.is still under review by the NRC staff.
If it is determined that actions are required, such as additional periodic tests with differential pressure or other actions, you will be notified in an appropriate manner.
In the meantime, no response to this notice is required.
If you have questions regarding this matter, please contact the Director of the appropriate Regional Office.
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IE Information Notice No. 81-31 October 8, 1981 LISTING OF RECENTLY ISSUED IE INFORMATiON NOTICES Information Subject Date Issued To Notice No.
Issued 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 l
Transmitter Causes Reactor Operating License (OL)
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 Iaformation with an Operating License Items (OL) or Construction Permit (CP) j 81-27 Flammable Gas Mixtures 9/3/81 All. power reactor facilities l
in the Waste Gas Decay with an Operating License Tanks in PWR Plants (0L) 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 (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 (0L) or Construction Permit (CP) i Enclosure
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