05000237/LER-1981-053-03, /03L-0:on 810817,trip Point of 1 Refueling Floor ARM Found to Be Above Tech Spec Limit.Caused by Setpoint Drift.Arm Alarm & Trip Setpoint Reset to Comply W/Tech Spec Requirement

/03L-0:on 810817,trip Point of 1 Refueling Floor ARM Found to Be Above Tech Spec Limit.Caused by Setpoint Drift.Arm Alarm & Trip Setpoint Reset to Comply W/Tech Spec Requirement

ML20010G025
Person / Time
Site:	Dresden
Issue date:	09/03/1981
From:	Coen R COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20010G010	List: 05000237/LER-1981-053, Forwards LER 81-053/03L-0 05000237/LER-1981-053-03, /03L-0:on 810817,trip Point of 1 Refueling Floor ARM Found to Be Above Tech Spec Limit.Caused by Setpoint Drift.Arm Alarm & Trip Setpoint Reset to Comply W/Tech Spec Requirement
References
LER-81-053-03L, LER-81-53-3L, NUDOCS 8109150241
Download: ML20010G025 (2)

LER-1981-053, /03L-0:on 810817,trip Point of 1 Refueling Floor ARM Found to Be Above Tech Spec Limit.Caused by Setpoint Drift.Arm Alarm & Trip Setpoint Reset to Comply W/Tech Spec Requirement

Event date:
Report date:
2371981053R03 - NRC Website

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NRC FORA 4 ?,64

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U.S. NUCLEAR REGULATCRY COMMISSION (7 77)

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8 80 81 ooCKET NuMSER 68 89 EV ENT oATE 74 7s MEPORT oATE 80 EVENT DESCRIPTION AN0 PROS A8LE CONSECUENCES h l o l 21 l During surveillance testine-the trip point of 1 Refueling Floor ARM was found to be l

i o l a 1 l above the limit required by Tech. Spec. 3.2.E.3.

There was no effect on the public l

I o I 4 I l healt's and safety as all redundant Refueling Floor ARM's were operable during the event.l [oIsl l Previous occurences: RO 50-249/81-7 and R0 SCw249/79-17.

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CAUSF "JESCRIPTION AND CORRECTIVE ACTIONS h i s l o l l The causc of the event was scyeint drif t.

The Adi Alarm and trip setpoint was reset l

yl from the as found 105 mr per hour to comply with the Technicsi Specification requiremenq.

g l Repeatabi]sry was verified.

Functional testing of the Refueling Floor rad. monitors l

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NAME OF PRCP AFR

/O DEVIATION REPORT e

(9 DV R NO.

Commonwealth Em.. son STA UNIT YEAR N O.

D 2 96 PART 11 TI TLE OF DEVI ATION OCCU RRED 8-17-81 Unit 2 Fuel Pool ARM High Rad.

- 0900 DATE HME SYSTEM AFFECTED 1700

PLANT CONDITIONS

TESTING UC C Process Rad. Monitors Run 1478 438 ygs no MODE AwRivwT)

, LOAD (MWE)

DESCRIPTION OF EVENT

While conducting surveillance DIS 1700-7, the ARM alarm and trip unit for the Unit 2 Fuel Pool Area was found to trip at 105 mr/hr. (Tech Spe,. limit - 100mr/hr) Tech. Spec. 3.2.E.3.

DESCRIPTION OF CAUSE Undetermined DTHER APPLICABLE INFORMATION Reset alarm and trip unit.

Repeated check of trip point 3 times, trips ok at 95 mr/hr.

EQUIPMENT C VES OR NO.

WR NO.

Donald C. Reierson 8-17-81 FAILLRF v NO N/A N/A gg5PONSIBLE SUPERVISOR DATE PART 2_j OPERATING ENGINEERS COMMENTS Unit 3 Fuel Pool Area Radiation Monitor was operable. In additic% two ot.her area radiation

_gtyitor were operable on Unit 2.

SAFETY-TYPE OF CEVIATION EVENT OF POTENTIAL TECH SPEC NON-REPORTABLE ANNUAL RELATED REPORTABLE 0] URRENCE PUBLIC INTEREST VIOLATION OCURRENCE REPORTi t;G WR ISSUED 10CFR21 YES X YES 14 CAY lXl30 CAY NTFCT N NO NO n

REPORTABLE CCCURRENCE ACTION ITEM NO.

PROMPT ON-SITE NOTIFICATION NU BG R. M. Ragan 8-26-81 0830 hrs.

TITLE DATE TIME 3XX 81-53/03L-0 TITLE DATE T I..f E 24-HOUR NRC NOTIFICATION PRCMPT OFF-SITE NOTIFICATION TPH N/A F. A. Palmer 8-26-81 1555 hrs.

REGION II:

DATE TIME TITLE DATE TIME TGM N/A REGION lli & COL CATE TIME TI TL E DATE TIME RESPONSI ELE COMP ANY OFFI CER INFORMEO OF 10CFR21

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CONDITIONS AND THEL A DEPOPT TO NPC

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DATE

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RESOLUTICN APPPOVED AND AUTHORIZED FOR DISThlBUTION

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