ML19261F292

Abnormal Occurrence 74-2:on 740422,during Testing,Potential Set Point Error on Pressure Switches for High Reactor Bldg Reactor Trip Found to Be Plus or Minus 0.135 Psig.New Set Point of 3.75 Psig Recommended & Agreed Upon

ML19261F292
Person / Time
Site:	Three Mile Island
Issue date:	05/01/1974
From:	Arnold R METROPOLITAN EDISON CO.
To:
References
NUDOCS 7910250745
Download: ML19261F292 (2)

Text

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U. S. Atc=ic Energy Cc==ission @ 4, cyg. 78h[&, C,'

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Gcatlemen:

Operating License DPR-50 Docket No. 50-289 V'M CM'd .

Abnor=al Occurrence No. A0-Th-2 In accordance with Technical Specificaticns for the Three Mile Island Nuclear Statica Unit 1, Secticn 6.7 2.a.h. , we are reporting the folleving incident as an abnormal occurrence ( AO-Th-2) as defined by Section 1.8.a.

At 1100 on April 22,197L, during initial fuel loading, the pressure svitches for the High Peacter Building Pressure reactor trip were decreased by Instrument Technicians frc= L.0 psig to a =cre conservative setting of 3 75 psig to account fcr pctential set point errors. The Test Ccordi-nator, in reviewing the test results, discovered that the as-found setting for Channel A was 4.1 psig and for Channel D was h.15 psig, which ecnsti-tutes safety system settings less conservative than the li=it of h.0 psig as defined by Section 2 3.1 and Table 2 3-1 Ite 8 of Technical Specifica-tiens.

Based upon a review by on-site engineering persennel of the Technical Manualc- for the associated equipment, the pctential set pch errer was concluded to be +C.135 psig. The Plant operatiens Review

_ -4ttee (FCRC) met prc=ptly after the incident, concurred with the analysis of the set point error, and recc==?nded to the Plant Superintendent that the new set point of 3 75 psig was adequate to prevent recurrence. The Plant Superintendent has ccccurred in this finding.

Sincerely,

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'"iOLD Vice President-Generaticn -

RCA:DNG:sh ec: Directcrate of Regulatory Cperations, Regien 1 U. S. Atc=ic Energy Cc==issicn 631 Park Avenue King of Prussia, Pennsylvania 4()f2 19hc6