ML20039F001

LER 81-072/03L-0:on 811203,standby Gas Treatment Sys Train B Tripped Following Group II & III Isolation Signal & Declared Inoperable.Caused by Plugged Orifice on Air Flow Controller, Stopping Air Flow & Falsely Indicating Fan Flow

ML20039F001
Person / Time
Site:	Dresden
Issue date:	12/31/1981
From:	Anandappa A COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20039E997	List: ML20039E996 ML20039F001
References
LER-81-072-03L, LER-81-72-3L, NUDOCS 8201110707
Download: ML20039F001 (2)

Text

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. . LICENSEE EVENT REPORT CONTROL BLOCK: l 1

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? 8 68 69 74 75 REPORT DATE QoCKET NUMSER EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h ITTil I During normal operations, Standby Gas Treatment System (SBGTS) Train "B" auto started I

,,,3, l and tripped following Group II and Group III isolation signal. SBGTS Train "B" was l

,og,,[ declared inoperable (T.S.3.7.B). The safety significance was minimal since the redun- l

,,,,, , dant "A" Train started immediately following trip of "B" Train. There was no effect to l l0I6l l ' '

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40 el 42 43 CAUSE OtSCRIPTION AND CORRECTIVE ACTIONS h l i l o l l Event was caused bv a pluened air flow restrictf ac orffico en #1cv contro11gv 7/%79&1- l g 1280 which prevented air flow into the controller which in turn fnisolv fadic'end f,a I g l flow and tripped the "B" SBGTS. The orifice was cleaned of all oil and crud and rein- 1 ITTTl I stalled. "B" SBGTS was auto started and operated successfully. No further action I gg deemed necessary. I

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. Commonwealth E, son DEVIATION REPORT gy, yg, , , ,

S T A 12 uN I T 2 YE AR 81NO.131 PART fl TI TLE OF DEVI A TION OCCURRED Train "B" SBGTS Failure to Auto Start 12/3/81 0842 OAtr Tive SYSTEM AFFEC?- P L AN T S TA TUS A T TIME OF EVENT 7500 TESTING SBGT CESCRIPTION OF EVENT MODE _ Run . P WR IM wT ) 2489 . LOA 0(MAE) 820 hg h Standby gas treatment train "B" tripped after auto starting following Group II and Group III initiation. SBGT Train "A", which was in standby, then auto started, to CFasO.72 NRC RED PHONE O O NOTIF IC ATION MADE YES NO E QU I PMEN T FA ILURE D17301 CYES NO AORK RECUEST NO. RESPON3tBLE 9UPEDVISOR J. Achterberg naTE 12/3/81 P ART 2 l 0PERA TI NG ENGINE ER' S C0h" TENTS Train "A" SBGT was started as required by Tech. Specs. to prove operability.

Train "B" SBGT was repaired and operability demonstrated.

] EVENT OF PUBL I C INTEPEST C 24-HOUR NRC NOTI F ICATI ON REQ'D 0 TEC". SPEC. v i OL A T i O.3 TELEPH N/A REGION III DATE TIME NON REPCR TABLE OCCURRENCE N/A TELECM/TELECCPY f4 DAY REPO R T A HLE/ T. S. REGION lli DATE TIME

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CECO CORPORATE OFFICER DATE TIME PRtLIMINARY REPORT COMPLE TED ANT, REV IEWED John M. Almer 12/7/81 g,7, INVESTI GATED REPORT & RESOLUTIUN ACCEPTED BY STATION REviEA J /J

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