ML20084L898
| ML20084L898 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 06/17/1974 |
| From: | Stephenson B COMMONWEALTH EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML20084L899 | List: |
| References | |
| NUDOCS 8305240170 | |
| Download: ML20084L898 (2) | |
Text
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PMS MR JAMES G KEPPLER REGIONAL DIRECTOR DIRECTORATE OF REGUINTORY R,FggMS-(OTadR THAN UONEY ORDERS) p trux US ATOMIC ENEhGYSIsiGtitdICiMELIVERY rcq;osted?
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THIS-WILL' CONFIRM OUR CONVERSATION WITti F. MAURA 0F YOUR Y
M OFFICE AT 1515 HOURS IttAT DaTE CONCERNING A FAILURE TO OPERATE
. O tr j@toPROPERLY ON MAY 22, 1974 0F MAIN STEAM DRAIN VALVE M05-220-2.
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WHILE CL0 DING THIS VALVE PRIOR TO LOCAL LEAK RATE TESTING THE EREAKER TRIPPED.AND REQUIRED RESETTING SEVERAL TIMES BEFORE THE VALVE WOULD FULLY CLO5E THIS PHOBLEM WAS NOT NOTED IN THE i, )
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IS SUBMITTED LATE. A 10 DAY LETTER DETAILED THE CORRECTIN3 ACTION IS n) RIH COMING IN ACCORDANCE WITH REGULATORY GUIDES j(
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J Mr. J. F. O' Leary, Director D1roctorate of Licensing U. S. Ato:nic Enert;y Ccuuission p@\\o, '
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>m.1 OPEnt.TED VALV3 2-220-2 TO OPEtl.,
Referenec: liotification to Region III of AEC Regulatory Operations Telephone: lir. F. luura, 1350 hours0.0156 days <br />0.375 hours <br />0.00223 weeks <br />5.13675e-4 months <br /> on May 22, 1974 Telegram: Mr. J. Y.cppler, 1417 hours0.0164 days <br />0.394 hours <br />0.00234 weeks <br />5.391685e-4 months <br /> on May 22, 1974
Dear !!r. O' Leary:
Th!9 ictrar in to report a condition relr. ting to the o;.aration of tna unit at atcu*. U w s nearn en n2y 24, ty/4 At enat tiro, naln stean lino drain valvo 2-220-2 failed to open.
This rulfunction is coarrary to toctica 3.7 D.1 of the Technical Specifications which requirca that -11 isolation valvca listed in table 3.7.1 be ope rable during power (pera:. ions.
P30!1Ltli Af ter performing a modificatic>n, in which the thermal overloads on 1:02-220-2 vere changed, the valve ms functionally tested.
During tha functictul test, tha valve failed to opeu.
At the time of the failure, the unit was in the "Run" rode with thereal pcuer at 2028 ecgawatta. Elcatrical load at the tire of the failure vas 637 cosm.atta.
TMTSTICATIO'.1 An investigation into the proble:3 was initiated frmediately by the station olcetrical depart:nent. Tha invutigation revealed t. hat the valve faticd to open because the motor contcetor failed to pick-up.
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Hr. J. F. O'Lecry May 28,1974-An inspection of the motor contactor revealed that the air gap between the contactor coil and armature was too great.
It was further discovered that the large air gap was caused by the loosening of the armaturo stop acrew. The arcature stop screw adjusts the air gap by proventing tho arcature fro:s dropping too far open when the contactor to de-enorgined.
CORRECTIVE ACTION To correct the failure, the armature stop screw was adjusted properly and a lock nut for the screw was tightened securely.
During the cdjustment of the stop screw, the lock nut wa.s found only finger tight, at.d it is believed that the lock nut was loose since original installation.
Since this is the first occurrence of this type of failure, the corrective action taken at this tino was to adjust the armature stop screw and tighten the lock nut.
In addition, the adjustment and the tightness of the lock nut will be checked during subsequent breaker inspections. At this tico, in view of cu=ulative experience, the corrective actions taken were adequa*,c.
EVALUATIOM9 During the failure of valve 2-220-2 the acfety of the plant ned publfa "e: n:t in j::padj. ' k.. i.. 2-22G-2 udve in uco, it railed in the closed or isolated conditica.
In addition, the inboard isolation valve h02-220-1 was also closed.. Alco at the time of the failure all cafety systerna warc operable.
Sincerely, p
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gl f:nn B.'3.'Stephenson Suparintendent BDS:TEL:do
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