ML19210A180

Abnormal Occurrence 75-16:improper Trip Setpoints on Variable Low Reactor Coolant Sys Pressure Sys Violated Tech Specs

ML19210A180
Person / Time
Site:	Three Mile Island
Issue date:	06/06/1975
From:	Herbein J METROPOLITAN EDISON CO.
To:
Shared Package
ML19210A178	List: ML19210A177 ML19210A180 ML19210A185
References
NUDOCS 7910240903
Download: ML19210A180 (1)

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nETROPOLITAN EDISON COMPANY suassounvorcruent.ruaucununescoaronnouj TELEPHONE 717-044 4041

' OF'FICE BOX 480 MIDDLETOWN. PENNSYLVANIA 17057 Mr. J. P. O'Reilly, Director June 6. 1975 Directorate of Regulatory Operations Region I 631 Park Avenue King of Prussia, Pa.19406

.cdn, C,M9d %e,0*%'

D  %.\u Operating License DPR-50 Docket 50-289

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Subject:

Abnormal Occumnce No. AD 75-16

Dear Mr. O'Reilly:

This telegram is to confirm the tekecon between Lee Spessard (Region I-DRO),

and J. J. Colitz (THI Unit I Superintendent) at 1630 hours0.0189 days <br />0.453 hours <br />0.0027 weeks <br />6.20215e-4 months <br />, June 6,1975.

Violation of Technical Specification 2.3.1 in that the variable low reactor coolant system pressure trip setpoints for three RPS channels were found to be less conservative than the setpoint listed in Tabic 2.3.1 (Page 2-9) of the Technical Specifications.

The required and actual trip points for the channels out of specification were as follows: ,

Table 2.3-1 Trip Actual Trip Point

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.Setpoint at 5900 F. Measured at the Channel .(16.25 T out - 77S51 Bistable 1831.5 1827.4, .

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, 1831.5 1828.9

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1:31.5 1827.5'v The variable low reactor ecolant system pressure trip setpoints were being checked as part of routine Surveillance Procedure 1303-4.1, "22 actor . Fro-tection System Surveillance". All other reacter protection system trip setpoints were tested and found to be within Technical Specification limits.

The out-of-specification channels hava been recalibrated and . retested, and the resulting trip setpoints were verified as being within Technical Specification : limits. ,

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Very truly yours,'

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J. G. Herbein A ffhA$O ,

Station Superintendent 1. ji 7 4 1 lDU r

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TMI Nuclear Station  :

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