ML20090E215

AO 50-220/74-1:on 740225,during Routine Surveillance Testing,Core Spray Differential Pressure Instrument (Barton 288-4802,RV-30A) Actuated Low.Caused by Setpoint Drift. Instrument Will Be Modified

ML20090E215
Person / Time
Site:	Nine Mile Point
Issue date:	03/08/1974
From:	Perkins T NIAGARA MOHAWK POWER CORP.
To:	Skovholt D US ATOMIC ENERGY COMMISSION (AEC)
References
2000, AO-50-220-74-1, NUDOCS 8303140131
Download: ML20090E215 (4)

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k/ , s NIAGARA MOHAWK power CORPORATION NtACARA ' MOHAWK

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Mr. Donald J. Skovholt Q7 Assistant Director for Reactor Operations Division of Reactor Licensing U.S. Atomic Energy Commission Washington, D. C. 20545 Rc: Drovisional Operating License: DPR-17 Docket No.- 50-220

Dear Mr. Skovholt:

Persuant to Nine Mile Point Nuclear Station Unit il Technical Specifications 1.13 d and 4.14 J we are reporting as an abnormal cecurrence, an alarm limit drift on one core spray differential pressure instrument.

On February 25, 1974 during routine surveillance testing, one.

core spray differential pressure instrument (Barton 288-4802, RV-30A) was foitnd to actuate at a lower value than that as set forth in the instrument surveillance checklist. This is the second drift in set point of this particular instrument i . Notification was made to Region I, Division of Regulatory Operations on February 26, 1974.

The instrument surveillance checklist set point is 5 psid +0-1.0. The instrument actuated on alarm at 3.5 psid or at a lower differential than is required. liowever awareness of an abnormal condition in the cc,re spray piping would have alarmed sooner than required thus the drift was in a safe direction. The instrument as-designed is intender 1 to provide an alarm only and serves no protective circuitry function.

The primary function of the core. spray differential pressure indicators is to monitor the condition of the core spray piping between the reactor vessel. A loss of integrity would create a differential pressure in the range of- 20-25 psid under normal operating conditions.

To prevent re-occurrence.of this ' instrument set point drift

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a modification will be made to the..Barton instrument to minimize if not eliminate the problem. Thisimodification will be made during the upcoaing Spring refueling outage scheduled to commence /

this month. $ ' te 8303140131 740308

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PDR ADOCK 05000220 +g (/ l ,/ [,f M COPY SENT REGION M f e 2000

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f 1,ll Mr. Donald J. SkovholL L rch 6, 1974 1

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< Based upon the fact that the drift was in the safe direction, e, ., c .

no undue ha:ard was presented to the general publi'c a,5 a result of' ~ ~S1 I this instrument drift. - 7 '...o. , . W 'd : , - .

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h ORICINAL~ SIGNED BY R.R.SCHNEIDER '. .

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R.R. Schneider . .% = ,-

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