ML20028A718

LER 82-040/03L-0:on 821019,upscale Trip Point of Channel B Refuel Floor Area Radiation monitor,3-1705-8B,found at 130 Mrem/H.Caused by Instrument Set Point Drift.Monitor Reset to Trip at 90 Mrem/H

ML20028A718
Person / Time
Site:	Dresden
Issue date:	11/04/1982
From:	Turnquest L COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20028A713	List: ML20028A712 ML20028A718
References
LER-82-040-03L-01, LER-82-40-3L-1, NUDOCS 8211240306
Download: ML20028A718 (2)

Text

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si Docx5TNumesA W 88 - EVENT oATE 74 75 REPORT QATE 80 EVENT DESCRIPTION AND PROSASLE CONSEQUENCES h l o 121 lDuring normal operation, as surveillance DIS 1700-7 was being performed, the upscale l r.unia l trip point of Channel B Refuel Floor Area Radiation Monitor (3-1705-8B) was found to l foIAIlbe at 130 MR/hr, which is above the Tech. Spec. limit of 100 MR/hr. (T.S. 6.6.B.2.a). l M IThe event was of minimal safety significance since Channel A was operable. There was l I o is 1 lno ef fect on public health or safety. Similar occurrence reported by R.O. 81-07/03L-0 l l 0 l 7 I l On Docket 50-249. l l 0 l81 l l 7 s3 30

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l i l o l I The ennee of the event was due to in st rument set Doint drift. The Channel B Refuel l IiiillPlnnr Aren Rndf ation Monitor was immediatelv reset to triD at 90 MR/hr and then tested I

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l i I DEVIATION REPORT Commonwealth Ed son gy, ,o , , ,

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PART fl TITLE OF DEvlATION Unit 3 Channel "B" Refuel Floor OCCURRED Aru Radiation Monitor Greater Than 100 MR/HR onTr w YSTEM AFFECTED 1700 PL ANT STATUS AT TIME OF EVENT TESTING MODE Run , p ,pcuy73 2494 , LOAD (M*E) b10 R a on Monitoring y DESCRIPTION OF EVENT Found Upscale Trip Point of Channel B Refuel Floor Area Radiation Monitor (3-1705-83) at 130 MR/hr increasing, which is 30 MR/hr above Tech. Spec. limit. Readjusted trip to 90 MR/hr increasing and verified repeatability.

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NOTIFICATION MADE YES NO EQUlPMENT F AILURE N/A OVES O No .oR, REouEST No. REsPoNSiBtE SuPERvlSoR Alan R. Zapotocky oATE 10/20/82 PART 2 l OPERATING ENGINEER'S COhWENTS Tha 3B refuel floor arm was innediately reset to trip at less than the Tech. Spec. limit.

Tha 3A arm tripped within Tech. Spec. limits.

EVENT OF PU BL I C INTEREST O 24-HOUR NRC NOTIFICATION REC'D l

TECH. SPEC. VIOLATION TELEPH Tom Tongue (courtesy) 10/21/82 0745 l REGION lli DATE TIME NON REPORTABLE OCCURRENCE TELEGM/TELECOPY N/A 14 DAY REPO R T A BL E / T. S. REGION til DATE TIME 30 DAY REP OR TA BLEi 1*.

CECO CORPORATE NOTIFIC ATION MADE l

ANNUAL /SPECL REPORT REQ'D IF ABOVE NOTIFICATION 15 PER 10CFR21 l

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$* DAY WRITTEN REPORT RE0'D PER 10CFR21 L.E.R. ,82-40/03L-0 TELEPH Dennis P. Galle 10/21/82 1330 CECO CORPORATE OFFICER DATE TIME P$ Y AN E*ED OPER ATI% ENGINEER D A TE INVESTIGATED REPORT & RESOLUTION ACCEPTED BY STATION REvit'* ,

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RESOLUTION APPROVED AND AUTHOR I ZED FOR DI STRI BUTION

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