ML20024E172

Updated LER 81-015/03X-1:on 810226,sample Pump for Control Room Radiation Monitor Found Out of Svc,Rendering Automatic Recirculation of Control Room Ventilation Sys on High Radiation Inoperable.Caused by seizure.W/830714 Ltr

ML20024E172
Person / Time
Site:	Calvert Cliffs
Issue date:	07/14/1983
From:	Cartwright W, Davis S, Russell L BALTIMORE GAS & ELECTRIC CO.
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-81-015-03X, LER-81-15-3X, NUDOCS 8308090365
Download: ML20024E172 (3)

Text

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UPDATED REPORT PREVIOUS REPORT DATE: 03-26-83 N A FO, M 3061 U.S. MUCL'if Q 00CULATROY CIMMIS$13 M APPR ' V A LV Es M i U *" LICENSEE EVENT HEPORT $'x'rU$e-s tres (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o2 l At 1245 the Shift Supervisor was informed that the sample numn for the l l 013 l l Control Room (CR) rad monitor had been out of service since 0700 ren- l l o 14 l l dering auto recirc of the CR inoperable on high radiation (T.S. 3.7.6.1) . l l0 l5 l l The CR MVAC was placed in recire and 11 POST LOCA filter was started l 0 6 l at 1315. The numo was repaired and CR HVAC returned to normal at 1530. l l 0 l 7 l l Both CR HVAC trains were otherwise operable during the event. Unit 2 l

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CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS h 1110 l l The sample numo seized durina operation and was removed from service. l l1l1ll It was replaced with a spare. It appears that due to oxidation on the _j t 2 I bore. the pumn vanes bound un and broke off causing seizure. This is l l

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NAME OF PREPARER S. M. Davis /W. B. Cartwright PHONE: 301-269-4802

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D B ALTIMORE G AS AND ELECTRIC COMPANY P.O. BOX 14 7 5 B A LTIM O R E. M A R YL A N D 212o3 HUCLEAR POWER DEPARTMENT CALVERT CLIFFS NUCLEAR Pow 2R PLANT LUSBY, M ARYLAND 20657 July 14, 1983 Dr. Thomas E. Murley Docket No. 50-317 Regional Administrator . License No. DPR 53 U. S. Nuclear Regulatory Commission Region 1 631 Park Avenue.

King of Prussia, PA 19406

Dear Dr. Murley:

Attached is LER 81-15/3X, Revision 1, as required by Technical Specification 6.9.

Should you have any questions regarding this report, we would be pleased to discuss them with you.

Very truly yours, p.,,,L. B. Russell Plant Superintendent LBR:WBC:bsb cc: Director, Office of Management Information and Program Control Messrs: A. E. Lundvall, Jr.

J. A. Tiernan 9

6 i):

r-LER NO. 81-15/3X, Rev. 1

' DOCKET NO.' 50-317 LICENSE NO. DPR.53 EVENT DATE '02-26-81

. REPORT DATE 07-14-83 ATTACHMENT ~

EVENT DESCRIPTTON AND PROBABLE CONSEQUENCES (CONT'D)

During normal operation at approximately 1245 the Senior Control Room 10perator. informed the Shift Supervisor that'the sample' pump for the control room radiation monitor had been out-of-service since 0700 rendering automatic recirculation of the contro11 room ventilation system on high radiation inoperable. Therefore at 1315, the control room ventilation system was placed in recirculation and 11 POST LOCA

-filter was started. Per the requirements of Technical Specification 3.7.6.1 the sample pump was repaired and the control' room ventilation system was returned to normal operation at 1530.

.Both trains of control room ventilation were otherwise operational during the event. Unit 2 (50-318) was in mode 5 during the event.

This event did not affect the health or safety of the public. This is not a repetitive event.

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (CONT'D)

Due to the constant properties (temperature / low humidity) of the Control Room atmosphere, these pumps operate with a predictable lifetime. A preventive maintenance program has been developed and will be instituted to change the Control Room RMS pumps on a regular basis to prevent a recurrence of this event.