05000249/LER-1982-013-03, /03L-0:on 820204,during Refueling Outage,Nitrogen Inerting Makeup Sys Supplying Nitrogen to Drywell Found to Leak at Rate of 80.39 Scfh.Caused by External Damage to Pressure Valve RV-3-8526.Valve Will Be Replaced

/03L-0:on 820204,during Refueling Outage,Nitrogen Inerting Makeup Sys Supplying Nitrogen to Drywell Found to Leak at Rate of 80.39 Scfh.Caused by External Damage to Pressure Valve RV-3-8526.Valve Will Be Replaced

ML20041E621
Person / Time
Site:	Dresden
Issue date:	03/02/1982
From:	Whalen R COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20041E618	List: 05000249/LER-1982-013, Forwards LER 82-013/03L-0 05000249/LER-1982-013-03, /03L-0:on 820204,during Refueling Outage,Nitrogen Inerting Makeup Sys Supplying Nitrogen to Drywell Found to Leak at Rate of 80.39 Scfh.Caused by External Damage to Pressure Valve RV-3-8526.Valve Will Be Replaced
References
LER-82-013-03L, LER-82-13-3L, NUDOCS 8203110180
Download: ML20041E621 (2)

LER-1982-013, /03L-0:on 820204,during Refueling Outage,Nitrogen Inerting Makeup Sys Supplying Nitrogen to Drywell Found to Leak at Rate of 80.39 Scfh.Caused by External Damage to Pressure Valve RV-3-8526.Valve Will Be Replaced

Event date:
Report date:
2491982013R03 - NRC Website

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8 60 61 coCXET NuMSE R 68 69 EV ENT cATg 74 75 REPORT oATE 40 EVENT DESCRIPTION AND PROBA8LE CONSECUENCES h l o I a l l During a refueling outage, local leak rate testing was being performed in accordance withl l g g station procedure DTS 1600-1.

The nitrogen inerting makeup system, which supplies nitro-l

,n,c,; gen to the drywell, was found to leak at a rate of 80.39 SCFH. Although this is in ex-l

,9,,,, cess of the T.S. 4.7.1 limit of 29.38.SCFH, this condition is of minimal safety signifi-l cance since the associated isolation valves were operable. Last previous occurrence on l

this system reported by R.O. 81-12 on Docket 50-249.

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liiollThe source of the leakage was found to be pressure relief valve RV-3-8526 (Dresser 3/4" l

,,,,,[1980C).

The relief valve, which had failed open due to external damage, will be reolaced I

and the test rerun prior to reactor startup. Any leakage in excess of the Tech. Specs.

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will be reported at that time.

Local leak rate testing of these systems will continue to [

be performed during refueling outages.

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NAME CF PMEP ARER PHONE:

@ Commonwealth Edison DEVIATION REPORT DvR NO.

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3 17 STA UNIT YEAR NO.

P A3 T tl TITLE OF DEVIAfl0N OCCURRED 2-4-82 1800 Failure of the N Make-Up Valve to Pass LLRT 7

em 7,,y SYSTEM AFFFCTED 1600 PLANT STATUS AT TIME OF EVENT TESTING hg Containment MODE Refuel,p*R(MnT) 0

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,g OESCRIPTION OF EVENT While performing DTS 1600-1, Local Leak Rate Testing of Primary Contain-ment Isolation Valves, the pressure relief valve RV-3-8526 failed open causing the N2 make-up piping to fail the local leak rate test.

Leakage was found to be at a rate of 80.39 SCFH which is in excess of the Tech. Spec. 4.7.1 limit of 29.38 SCFH.

10 CFR50.72 NRC RED PHONE NOTIFICATION MADE YES NO EOUiPMENT FAILURE D18578 GYES NO a0RK REQUEST No.

RESPONSIBLE SUPERvlSOR Ed Rowley nATE 2-5-82 P ART 2 l 0PERATING ENGINEER'S COMMENTS Local leak rate test indicates that all leakage was through the relief valve RV 3-8526.

The relief valve will be repaired and retested prior to startup from the refueling outage.

EVENT OF PUBL IC INTEREST O 24-HOUR NRC NOTI F I CATI ON REO'D 0 TECH-SaEC. VIOLATION TELEPH Y

REGION III DATE TIME NON REPORTABLE OCCURRENCE TELECM / TEL ECOPY O 14 DAY REPORTABLE /T.S.

REGION lit DATE TIME l

. 30 DAY REPORTA BLE/ T.56. 6. B. 2. d g,,g, p

ANNUAL /SPECL REPORT RE0'O IF ABOVE NOTIFICATION IS PER 10CFR21

,N/A A.I.R.

O s-DAv aaiTTEN REPORT REO D eER iOCrR2i L.E.R.

82-13/03L-0 F. A. Palmer 2-8-82 1340 TEuPH CECO CORPORATE OFFICER DATE TIME PRELIMINARY REPCRT Michael Wright 2-5-82 COMPLETED AND REVIEAED GPERATING ENG6NEER OAJE l

INVESTIGATED REAORT & RESOLUTION

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AUTHOR IZED FOR DI STRIBUTION STATION SUPE NTENDENQ DATE e 6 - 5174 1Foeu 15-5 2-t )

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