ML19339A682

LER 80-072/01T-0:on 801002,reactor Protection Sys Trip Level Setting Was Adjusted to Nonconservative Level Due to Calculation Error.Procedure 7.4.14 Being Processed to Clearly Delineate Method for Calculating Set Points

ML19339A682
Person / Time
Site:	Pilgrim
Issue date:	10/27/1980
From:	Holland P BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19339A656	List: ML19339A655 ML19339A682
References
LER-80-072-01T, LER-80-72-1T, NUDOCS 8011040521
Download: ML19339A682 (2)

Text

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j 7 4 40 43 coC8C ET NUMgER N 09 EVENT 0 ATE 74 75 REPORT 0 ATE 80 EVENT DESCRIPT1CN AND PROSASLE CONSEQUENCES h j (TTT]l On October 15, 1980 the ORC concurred,following its review,that on October 2,1980 l j ~ .

(y77) l a RPS trip level setting was adjusted to a non-conservative level. The review con- l ,

io,Ai l cluded that as a result of a calculation error the Main Steam Line High Radiaolon l l ,o,3, , Monitors 1705-2A,B,C,D were set to 7.7 times normal full power background. Technical;

I i i a ,, i l Specification Table 3.1.1 indicates that this multiplication factor may not exceed i I

l yo,,yl 7. On October 14 immediately following identification of this error the monitors l.

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$ as 24 as a si ao di 42 42 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS lital l To preclude a repe:1 tion of this event, a revision to orocedure number 7.4.14, en- l i, ,,i ; titled " Source Calibration of Main Steam Line Radiation Monitors" is being processed.I l

This change will more clearly delineate the method for calculating set points for  ;

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