ML20039C528

LER 81-066/03L-1:on 811010,11,13,17,20,26,27,1130,1201 & 02, Fifteen Reactor Protection Instruments Found Out of Tolerance.Caused by Instrument Drift,Bellow Failure,Loose Test Point Output Terminal & Defective Photo Cell

ML20039C528
Person / Time
Site:	Crystal River
Issue date:	12/23/1981
From:	Charles Brown FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20039C518	List: ML20039C517 ML20039C528
References
LER-81-066-03L, LER-81-66-3L, NUDOCS 8112290436
Download: ML20039C528 (2)

Text

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E 60 61 DOCK ET NUMBER 68 69 E% ENT OAlg REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 l During performance of shutdown surveillance activities, various reactor protection l o 3 l instruments were found out of tolerance. These events were not attributed to a spe- l lol,l l cific activity as required by Reg. Guide 1.16 and consequently, are contrary to T.S. l I o l 51 1 3.3.1.1. There was no effect upon the health or safety of the general public. Fifteen l o s l instruments (RC-14A-DPT-4, RC-14A-DPT1, RC-14B-DPT4, RC-14B-DPT1, RC-14B-DPT2, ' RC-14B-DIYr3, g o l 7 l l RC-3B-PT1, RC-3B-PT2, & RC-3A-PT1 in October 1981, D1-5-7 on 11/30/81, B1-5-7, B1-5-10, l

,o;gy l RC-3B-PSI, NI-3, & N1-4, in December '81 were out of tolerance, & this is the ninth' l 80 7 8 9 OVent repogt unde is Spe g ication.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i l o l l RC-14A-DPT2 had a bellows failure. The bellows was replaced. RC-14B-DPT3 had a loose l l li l l test point output terminal. The terminal was tightened. RC-3B-PS1 had a defective I i, j7l l photo cell. The cell was replaced. All other instruments failed due to instrument l l,l31 l drift. All instruments were satisfactorily recalibrated. No further corrective l lij4l l action deemed necessary.

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SUPPLEMENTARY INFORMATION Report No.: 50-302/81-066/03L-1 Facility: Crystal River Unit 3 Report Date: December 23, 1981 Occurrence Date: October 10, 1981 Identification of Occurrence:

Various reactor protection instruments were found out-of-tolerance during shutdown surveillance activities. These events were not attributed to specific shutdown activities as required by Regulatory Guide 1.16, and, therefore, are being reported as contrary to Technical Specification 3.3.1.1.

Conditions Prior to Occurrence:

Mode 6 refueling (0%).

Description of Occurrence:

On October 10, 1981, during performance of SP-112, Calibration of the Reactor Protection System, RC-14A-DPT4 was found to be out-of-tolerance. On October 11, 1981, during performance of SP-112, RC-14A-DPTl was found out-of-tolerance. On October 13, 1981, during performance of SP-112, RC-14B-DPT4 and RC-14B-DPTl were found out-of-tolerance. On October 17, 1981, during performance of SP-112, RC-14B-DPT2 was found out-of-tolerance. On October 20, 1981, during performance of SP-112, RC-14B-DPT3 was found out-of tolerance. On October 26, 1981, during performance of SP-112, RC-3B-PTl and RC-3B-PT2 were found out-of-tolerance. On October 27, 1981, during performance of SP-112, RC-3A-PTl was found out-of-tolerance. On November 30, 1981, during performance of SP-112, D1-5-7 was found out-of-tolerance. On December 1, 1981, during performance of SP-112, B1-5-7, and B1-5-10, RC-3B-PSI and NI-4 were found out of tolerance. On December 2, 1981, dur-ing performance of SP-112, NI-3 was found out-of-tolerance.

Designation of Apparent Cause:

RC-14A-DPT4 had a bellows failure. The bellows was replaced.

RC-14B-DPT3 had a loose test point output terminal. The ter-minal was tightened. RC-3B-PSI had a defective photo cell. The cell was replaced. RC-14A-DPT1, RC-14B-DPT4, RC-14B-DPTl and RC-14B-DPT2, RC-3B-PT1, and RC-3B-PT2, RC-3A-PT1, DI-5-7, B1-5-7, Bi-5-10, NI-3, and NI-4 all failed due to instrument drift.

Analysis of Occurrence:

There was no effect upon the health or safety of the general public.

Corrective Action: All instruments were satisfactorily recalibrated. No further corrective action deemed necessary.

Failure Data: Fifteen instruments were found out-of-tolerance. This is the ninth event reported under this Specification.