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LER 78-038/03X-1 on 781108:review of Operational Data Showed That Quarterly Calibr of Nuclear Power Range Instrumentation Had Not Been Performed Per Schedule,Due to Scheduling Error
	ML18113A819
Person / Time
Site:	Surry
Issue date:	02/02/1979
From:	Baucom T; VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	; NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18113A817	List: ML18113A816; ML18113A818; ML18113A819;
References
	LER-78-038-03X, LER-78-38-3X, NUDOCS 7902060329
	Download: ML18113A819 (2)
	v • d • e

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. . . e Surry 1'01-,er Stat ion, Unit l Docket. No: 50-280 Iteport lfo: 7G-OJ3/03X--l Event Dnte: 11...:03-?3 Title of Report: Inc or*e /E:~:c ore Inst ru1ne nt Ca. l ibr at _i_i Jn

1. Descriptjon cf Event:

Upon review of opcr.1t:ional data, it was cktecmiilcd the.t the quo.-::-terl.y cali.b:r.a!:ion of thl*! nucle~r po\.*!er range instru1n(!ntation Ly H!?.i'.1.a:5 o.f the movable incore de!:,- *tor system h.:id not b2cn perfor1c:2d as schccblcd.

This is contrary t:-_: Technical Specific.:,tions 1:.* 1.A_ and is reportable as per Technical Specific.::itions 6.6.7...b.3.

2. Probable Cor1sequer*i:.es ur,d. _._Status _of R2cluecl;:.11t_ Systc~ms:

The nuclear Pm1e.: Range instrumentation is c-1libr.2ted on a cl--1ily basis <1ga:i.nst a heat bQl<ince* standard. The upp~r and .lo\.Ycr ion chrnnbE~r current~ are recalibrated quarterly to assur2 valid function of those protective fe~tures using F ( 6. I) as an input value. This calibration is checked on a monthly basis and ~-7,2,, within 1% on the map taken 10-17--73.

Therefore, the h,:;llth and safety of the~ general public were not affectcJ.

3. Cause:

This event was caused by failure to adequately schedule the PT that tracks the core exposure.

4. Imc:1,~diate Corrective Action:

As required by Technical Specifications 3.18.B, the unit's pc~*.'e1*

was reduced and limited to 90% power. The data required for the excore detector recalibration was taken.

Initial annlysis of the data indicated that the existing Incore/

E:*:core detector calibration was within l'.t, which is well within the required Rpecifications. The unit was returned to full pow~r. Detailed anal.ysis of the maps provided the data for comrletion of the recalibrn-tion procedures.

6. Actions Taken to Prevent Recurrence:

Personnel have been reinstructcd and schedule modified to provide for closer tracking ~of core exposure on a weekly rather than rnonthly basis.

7. Generic Implication~}

None.

ML18113A819

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