ML20084U807

AO 50-265/74-31:on 741230,setpoint of TS-2-261-17C in Primary Isolation Sys Found to Exceed Tech Spec Limit.Caused by Setpoint Drift.Switch Recalibr

ML20084U807
Person / Time
Site:	Quad Cities
Issue date:	01/09/1975
From:	Kalivianakis N COMMONWEALTH EDISON CO.
To:	Oleary J Office of Nuclear Reactor Regulation
Shared Package
ML20084U810	List: ML20084U807 ML20084U817
References
AO-50-265-74-31, NJK-75-21, NUDOCS 8306290279
Download: ML20084U807 (3)

Text

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January 9, 1975

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'A .. b i 74 . :g Mr. John F. O' Leary, Director Directorate of Licensing Regulation U. S. ATOMIC ENERGY COMMISSION Washington, D. C. 20545

REFERENCE:

QUAD-CITIES NUCLEAR POWER STATION Docket No. 50-265. DPR-30 .

Appendix A. Sections 1.0.A.2, 3.2.A, and 6.6.B.I.a.

Dear Mr. O ' Leary:

Enclosed please find Abnormal Occurrence Report No. 50-265/74-31 for quad-Cities Nuclear Power Station. This occurrence was previously reported to Region li t , Directorate of Regulatory Operations by telephone on December 30, 1974 and to you and Region 111, Directorate of Regulatory Operations by telecopy on December 30, 1974 This report is submitted to you in accordance with the requirements of Technical Specification 6.6.B.I.a.

Very truly yours, COMMONWEALTH EDISON COMPANY QUAD-CITI ES NUCLEAR POWER STATION k

N. J. Kalivianakis Station Superintendent NJK:RAR/dkp cc: Region ill, Directorate of Regulatory Operations J. S. Abe!

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, REPORT NUMBER: A0-50-265/74-31 ,

REPORT DATE: January 9, 1975 OCCURRENCE DATE: December 30, 1974 FACILITY: Quad-Cities Nuclear Power Station Cordova, IL 61242 IDENTIFICATION OF OCCURRENCE:

The setpoint of TS-2-261-17C, in the Primary Containment isolation System, was found to exceed its Technical Specification limit.

CONDITIONS PRIOR TO THE OCCURRENCE:

The unit was in cold shutdown for a refueling outage.

DESCRIPTION OF OCCURRENCE:

On December 30,1974 at 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br />, while doing routine REFUELING OUTAGE sur-veillance, TS-2-261-17C was found to trip at 222 F. This was in violation of Technical Specification 3.2.A. No operator actions were needed to bring the ~

situation under control.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

O_ther - Instrument Drift The apparent cause of this occurrence is instrument drift. The switch was replaced in June of 1974, along with the other fif teen switches, because of moisture problems in the conduits. These problems have since been corrected.

The "as-lef t" value at that time was 182 0F.

ANALYSIS OF OCCURRENCE:

Each Primary Containment isolation sub-channel has four of the temperature switches wired in series. Since all setpoints of the other switches were within limits the system would have functioned as designed if needed.

Therefore, there are no safety implications resulting from this occurrence.

CORRECTIVE ACTION:

The switch was recalibrated and installed back into .the system. All switches

- were functionally tested satisfactorily. The use of alternate suppliers for these temperature switches is being. evaluated.

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FAILURE DATA:

Equipment Piece Number TS-2-261-17C Manufacturer Fennal Model 17002-40 Range -1000 F to +200 F Open on increasing temperature i Failures of the similar switches for Unit I were discovered during its refuel-Ing outage and are listed below for reference. .

DATE EPN "AS FOUND" SETPOINT 4-15-74 1-261-15A 216 -

-16A 204

-17A 215

-18A 214

-15B 212

-16B 211

. -17B 213

-18B 208

-15C 211

-18C 216

-15D 213

-16D 206

-17D 212

-18D 212

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