ML20028A116

LER 82-042/01T-0:on 821027,excessive Water Found Leaking from Recirculation Pump Seal 3B.Caused by Recirculation Pump Seal Failure.Unit Manually Brought Down.Seals Replaced. Supplementary LER to Be Issued When Cause of Failure Known

ML20028A116
Person / Time
Site:	Dresden
Issue date:	11/09/1982
From:	Morgan W COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20028A105	List: ML20028A104 ML20028A116
References
LER-82-042-01T-01, LER-82-42-1T-1, NUDOCS 8211160439
Download: ML20028A116 (3)

Text

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U. S. NUCLEAR REEULATCOY CORestSS80N UCENSEE EVENT REPORT CONTROL SLOCK: l l l l l l (PLEAsE PRINT OR TYPE ALL REQutRED INFORGAATIONI i

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EVENT DESCRIPTION A4.0 PROSASLE CONSEQUENCES h lTTTl l During normal operations, an excessive water leakage was discovered leaking from 3B rei l

r.umi lcire pump seal (Tech. Spec. 6.6.B.l.c). An orderly load reduction was consnenced to l _

4 l isolate the 3B recire pump. Event was of minimal safety significance since all leak- l l age was contained in drywell floor drain system. There was no effect on public health l

@ l or safety. First occurrence of this type reported at Dresden. l 10171 l l_

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CAusE OESCRIPTION AND CORRECTIVE ACTIONS h

, l i l o i l The cause of the leakage was failure of the recire pump seals. A Generating Statica [

g l Emergency Plan unusual event was declared because of the excessive water leakage and -I g l terminated after isolation of 3B Recire pump. Unit manually brought down and recire l g l pump seals replaced. Upon discovery of the nature of this particular failure, a su~p- l g l plemental LER will be submitted. I 7 s9 so srA 4 POWER oTMeRSTATUS ScoV R olSCoVERY oEscRIPrioN g W@ l0 l 9 l 8 l@l N/A 7 4 y is i1 de l yg 4e 48 Operator Observation l 80 aetaAss LaAsa N/Aannouwroc acrivirY tocArion on notaASE @

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ATTACHMENT TO LICENSEE EVENT REPORT 82-42/0lT-0 COMMONWEALTH EDISON COMPANY (CWE) _ .

DRESDEN UNIT 3 (ILDRS-3)

DOCKET # 050-249 . _ . ___ ..

During normal operations, water was discovered leaking from the 3B Recirc pump. An orderly load reduction was conumenced to isolate the 3B Recire pump. All leakage was contained inside the drywell and directed to the drywell floor drain system. The drywell sump pumps indicated about e 41.5 GPM leakage into the primary containment compared to a Tech. Spec.

limit of 5 GPM. Therefore, a Generating Station Emergency Plan unusual event was declared. This condition was terminated after the recire pump was successfully isolated and a subsequent leakage check showed total leakage to be about 4 GPM.

The unit was manually shut down and the 3B Recire pump seais were removed and replaced with new seals. An investigation into this particular recire pump seal failure is being conducted and upon discovery of the nature of the problem, a supplemental LER will be submitted.

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Failure of Recirc Pump 3B Seals DEVIATION REPORT 12 -

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UNIT

- 82 YEAR 70 NO.

OCCURRED 10/27/82 2300 our Tiw SYSTEM AFFECTED 202 PLANT STATUS AT TIME OF EVENT TESTING r ulation MODE Run , p ,Rgu ,73 2490 , LOAD (MWE) 815 0, g VENT DESCRIPTION Increasing OF d/W pressure, hi R/C pump seal temps, and hi seal leakage at approximately 2300 indicated an increasing amount of leakage from 3B Recirc pump seals. A load drop of 200 MWe/hr began at 2320 to allow isolation of 3B R/C pump to stop leakage. At approximately 2400, total D/W leakage was calculated to be greater than 25 GPM (41.5 GPM). A GSEP un-usual event was declared and notifications made at 0014 on 10/28/82. "B" loop was isola-ted at approximately 0130. Several sump discharge measurements were made to determine the leakage after the loop was isolated. (over) to CrRso.72 NRC RED PHONE G O NOTIFICATION MADE YES NO EQUIPMENT FAILURE D 23648 OYES Oho WORK REoutST No. RESpoNSisLE Supervisor Thomas Mohr DATE 10/28/82 P ART 2 l OPERATING ENGINEER'S COhWENTS Rx operation continues with 3B recire loop isolated per DPR 25 Section 3L (single loop operation). Planning is in progress to replace the 3B recire pump seal at the earliest opportunity.

O EVENT OF PUBLIC INTEREST h24.HOURNRCNOTIFICATIONRE0'O O TECM. SPEC. vioLATiOg TELEPH Tom Tongue 10/28/82 0730 REGION IIf DATE TIME O NON REPORTABLE OCCURRENCE TELEGd/TELECOPY James Keppler 10/28/82 1210

@ 14 DAY REPORTABLE /T.S6.6.B.l.C REGION lit DATE TIME O 3o oAY aE*0aTABLE/t.S.

O ANNUAL /SPECL REPORT REQ'D O IF.ABOVE,,m , ,y , ,

NOTIFICATION IS PER IOCFR21 A.I.R. .

C 5. DAY WRITTEN REPORT RE0'D PER 10CFR21 L.E.R. ,82-42/01T-0 Telecopy Dennis P. Galle 10/28/82 1235 TELEPH 1 E M'" d an 10 /M / A2 nnan CECO CORPORATE OFFICER DATE TIME PRELIMINARY REPORT Michael Uright 10/28/82 COMPLETED AND REVIEWED OPERATING ENGINEER D A TE INVES1tGATED REPORT & RESOLUTION ACCEPTED BY STATION REVIEW h , b p......s.4 m . /A.J M >

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RESOLUTION APPROVED AND AUTHORIZED FOR DISTRIBUTION ~

b 06 5t76 (FORM 15 52 t) 10 01 TATION SUPER M NT DA TE I

Description of Event (con t)

Measurement at 0320 was 2.66 GPM floor drain leakage and 1.66 GPM equipment drain leakage at 0330. At 0333, GSEP condition was terminated. Rx power was brought up with A pump to approximately 50 percent power.

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