ML19269D538

LER 78-004/03L-0 on 780109:main Steam Line Low Pressure Switches Found to Actuate at Approx 35 Psig Below Tech Spec Requirements.Caused by Limited Setpoint Drift.Existing Surveillance Program Considered Adequate

ML19269D538
Person / Time
Site:	Rhode Island Atomic Energy Commission
Issue date:	02/16/1978
From:	Mathis C BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19269D536	List: ML19269D535 ML19269D538
References
LER-78-004-03L, LER-78-4-3L, NUDOCS 7906040217
Download: ML19269D538 (1)

Text

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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@ 0l5 0 l - l 0 l 2 l 3 l 3 @l 0 l 1 l 0 l 9 17 l 8 @ 750 l211 l417 41 OOCKET NUMSER 68 69 EVENT DATE 74 REPORT DATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h L o.L2_j l During routine surveillance testing, Main Steam Line Low pressure switches PS-261 - I fBT 1 1 30 A,c&D were found to actuate at approxiEtely 35 psig below the requirements of i ITTTll Table 3.2. A of the Technical Spuifications. These instruments initiate a contain- l

[TTT1 I ment isolation signal to the Main Steam isolation valves if the Reactor Mode Switch l lo ls ] l 1s in the RUN position. These instruments were immediately recalibrated and l satisfactorily tested. I lol7]l t o tal I

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44 47 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS i o l This occurrence was caused by limited setpoint drift. The existine surveillance I ji jijl program is considered adequate to detect problems of this tvoe, therefore. no 1 gg g additional corrective action is contemplated.

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i 4 I 80 1 8 9 ST US  % POWER OTHER STATUS 015 Oy RY DISCOVERY DESCRIPTION Iil5l W h l0 2 l 8 l@l N.A. l lBlh! Routine Surveillance Test l AC TIVITY CONTENT RELEASED OF RE LE ASE AMOUNT OF ACTIVITY LOCATION OF RELEASE N.A. l N.A. l tu6J8l.z 7 9 -

J @ LzJ@l 10 11 44 45 80 PER$0NNEL EXPOSL,RES NUV8ER TvPE DE SCRs PTION N.A. l i 7 l0 l 010 l@l Z l@l "

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• 8 PHON E.1-617-74 6- 4161 NAYE OF PREPARER

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