ML20041E621

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LER 82-013/03L-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
ML20041E621
Person / Time
Site: Dresden Constellation icon.png
Issue date: 03/02/1982
From: Whalen R
COMMONWEALTH EDISON CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20041E618 List:
References
LER-82-013-03L, LER-82-13-3L, NUDOCS 8203110180
Download: ML20041E621 (2)


Text

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? l 8 I 40? lh 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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42 43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

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. t

, ;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:

DEVIATION REPORT

@ Commonwealth Edison P A3 T tl TITLE OF DEVIAfl0N DvR NO. 12 -

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UNIT 17 YEAR NO.

OCCURRED 2-4-82 1800 Failure of the N7 Make-Up Valve to Pass LLRT em 7 , ,y SYSTEM AFFFCTED 1600 PLANT STATUS AT TIME OF EVENT TESTING Containment MODE Refuel ,p*R(MnT) 0 . LO AD l f.f* E ) 0 hg ,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 TELEPH Y 0 TECH- SaEC. VIOLATION 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 A.I.R. ,N/A O s-DAv aaiTTEN REPORT REO D eER iOCrR2i L.E.R. 82-13/03L-0 TEuPH F. A. Palmer 2-8-82 1340 CECO CORPORATE OFFICER DATE TIME PRELIMINARY REPCRT Michael Wright 2-5-82 COMPLETED AND REVIEAED GPERATING ENG6NEER _, , OAJE ,

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