ML20009D895
| ML20009D895 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 07/14/1981 |
| From: | Curtis N PENNSYLVANIA POWER & LIGHT CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, PLA-874, NUDOCS 8107240475 | |
| Download: ML20009D895 (4) | |
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PP&L TWO NORTH NINTH STREET, ALLENTOWF, PA.18101 PHONE: (215) 770 5151 NORMAN W. CURTIS
%ce President Engineenng & Construction Nuclear 77c 5381 P-July 14, 1981
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Mr. Boyce H. Grier JUL o '11981 e*
Director, Region I ty U. S. Nuclear Regulatory Commission
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SUSQUEHANNA STEAM ELECTRIC STATION FINAL REPORT OF A DEFICIENCY RELATING TO 7.GASTAT TIMING RELAYS ERs 100450/1005G3 FILE 840-4/900-10 PLA-874
References:
PLA-616 (2/11/81)
PLA.-508 (7/11/80)
Dear Mr. Grier:
i This letter serves to provide the Commission with a final report of I
a deficiency relating to the use of Agastat pneumatic timing relays.
I As.iuported in PLA-508, these relays were determined to exhibit premature time out and drifting set points.
1 The problen involving Agastat relay set point drift has been determined to be rot reportable under 10 CFR 50.55(e). NRC Region I Reactor Inspector, Mr. L. Narrow, was advised of this conclusion in a telephone conversation with Mr. A. Sabol of PP&L on April 28, 1981.
The problem involving the premature time out of the Agastat relay is still considered reportable under 50.55(e). The attached final report contains a description of this deficiency, its cause, safety implications and the corrective action taken and planned.
We trust the Commission will find the information provided by this report to be satisfactory.
Very truly yours, e
-N. W. Curtis p
Vice President-Engine,ering & Construction-Nuclear FLW:sab
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P E N N S Y LV A NI A POWER & LIG H T CO MP ANY
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0107240475 810714 PDR ADOCK 05000387 1e PDR
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- Mr. Boyce H. Grier July 14, 1981 Attachment t
Mr. Victor Stello (15)'
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Director-Office of' Inspection & Enrorcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555
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.Mr. G. Mcdonald, Director (1)
Office of Management Information & Program Control U. S. Nuclear Regulatory Commission
. Washington,'D.C. 20555
'Mr. Gary Rhoads U. S. Nuclear Regulatory Commission P.O. Box 52
.Shickshinny, PA 18655 1 1 J
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A Attachment PLA-874 Page 1 SUBJECT
.Agastat pneumatic timing relays, premature' time-out.
DESCRIPTION OF PROBLEM The Agastat pneumatic time delay relay has been identified as having a pre =ature time-out condition. Two (2) Agastat Model 7012AD timers in circuits turned over to PP&L exhibited this time-out condition. Subsequently, 37' additional timers in
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'the Unit I and co= mon equipment were tested (26 are installed'in "Q" listed equipment), with 21 timers exhibiting the premature time-out condition.
CAUSE The first two (2' A;,astat timers identified were returned to the Control Products Division of the Amtrace Corporation for investigation.
The Control Products Division stated that the condition was due to a small amount of compressor oil deposited on the diaphram coupler, which was the result of one of the vendors using unfiltered air at one station of a blow-off operation. The Control Products Division noted that this condition, which' could not be detected in their inspection operations, existed on a very small percentage of units shipped during the last few months of 1977.
The affected rela s were manufactured between the 45th weck of 1977 to the 12th week of 1978'(date coded serial numbers 7745 to 7812).
However, not all relays manufactured with a date code of 7745'to 7812 exhibit the premature time-out condition.
ANAI,YSIS OF SAFETY IMPLICATIONS
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Upon investigation, it has baen determined that Agastat pneumatic timing relays manuf actured within the date code period of 7745 to 7812 are used in the Control Structure Cooling Systems.
The time delay relays are used to override a temporary loss or low flow in the Co= mon Air Duct.
The premature time-out of a time delay relay could de-energize a complete Control Structure Cooling System. Since the Agastat time delay relays, used in the A and B f an circuit's, were manufactured during the same time period (7745 to 7812),'a co==on mode' failure and subsequent loss of both Control Structure Cooling Systems is considered possible.
Project Engineering has determined that, if the condition had gone uncorrected, it would have adversely affected the safe operation of the plant, and therefore, is reportable under the requirements of 10CFR 50.55(e).
. CORRECTIVE ACTION
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The Control Prod'ucts Division of the Amerace Corporation has determined the deficiency in the relays to be a m'anuf acturing problem, and have instituted the following:
- 1) Written procedures have been revised to'use only filtered air at the stations for blow-of.f operations.
- 2) All'co= pressors furnishing air to the stations for blow-off operatio,ns now have air filters.
- 3) An ultrasonic degreasing operation'has b'een added to clean the parts af ter the blow-of f operation.
4), A process inspection ha's been added before and af ter the ultrasonic degreasing operation to check for*an oil file on the parts.
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Attachment PLA-874 Page 2 1
An insp- : ion of'all safety related and non safety related Agastat pneumatic timing relays is being performed. All relays class lE and non-class lE, which were manufactured during the time period of 7745 to 7812, will be returned to the Control Products Division of the Amerace Corpration for cleaning and adjusting. The relays returned by the Contiol Products Division will be classified as non-class lE and will be used as needed in non-class lE r:ircuits. All relays removed from a class lE circuit will be replaced with qualified Agastat pneumatic timing relays (Agastat E7000 Series timing relays).
4 The qualifications for the Agastat E7000 Series timing relays are currently being reviewed by Bechtel Project Engir.eering to determine if they meet the Susquehanna requirements.
If any of the relays ~ do not meet the qualification requirements for
^ Susquehanna, they will be tri.cked and recorded on Bechtel NCR 728?
Each E7000 relay installed by.Bechtel will remain tagged under this NCR until Projr Engineering approves the qualification. documentaticn. PP&L/ISG will track ano.ecord the installation location for relays releas.ed to them.
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- CONCLUSION-The premature' time-out of the Agastat pneumatic timing relay was a manufacturing problem, which has been identified as occurring during a specific tims interval (date codes 7745 to 7312). The replacement or cleaning and adjusting of the Agastat pneumatic timing relays will resolve the premature time-out condition for SSES.
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