ML20010H831

RO 50-321/1981-090:on 810921,while Performing Surveillance Procedure HNP-1-3414,switches E51-NO12A-D Found to Be Actuating Outside Tech Spec Acceptance Criteria.Caused by Setpoint Drift.Switches Recalibr Per HNP-1-5279

ML20010H831
Person / Time
Site:	Hatch
Issue date:	09/22/1981
From:	Manry M GEORGIA POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
RO-50-321-1981, NUDOCS 8109290331
Download: ML20010H831 (3)

Text

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REGIONAL DIRECTOR DEPUTY DlRECiOR ASSISTANT TO DIRECTOR DIRECTOR, RRPI 01 BAXLEY. GEROGIA 31513 DIRECICR, EPOS PMS NR JAMES P. O'REILLY D',RTOR, ENF/lNV UNITIO STATES HUCLEAR REGULATORY CO*lSS@tECTOP, ETI DIREL0R OF INSPECTION AND ENFORCEF,ENT 6qpg 1 $ )'i '

3c REGION 11 PUBL',C AFFAiM OF[CER 'd-, /l . ,

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SUITE 3100 c

4'/~NV n M 101 MARIETTA STREET m /' -1 ATLANTA, GEORGIA 30303 s #, 1 .~~

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SUBJECT:

Hatch, Unit I, Docket No. 50-321 Ntification of Reportable Occurrence fx.

NOTIFIED: Virgil Brownlee "w '

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No. 50-321/1981-093. '

DATE: September 22, 1931 DATE: Septerber 22, 1981 -

TIME: 1300 Hours EST DESCRIPil0V GF REPORTASLE OCCURRENCE Initial Condition At time of at the99occurrence power. (Septeaber 21,1931, at 1700 flours CST), Unit I was j operating

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_Natu_re of Occurrenc_e:

l While perforaing surge 111ance procedure HNP-1-3414, RCIC Turbine Exhaust Dia-phragm Pressure Instrtment functional Test and Calibration, it was found that switches E51-N012A-D actuated outside the accept.ance criteria allowed in Tech Specs.

actuatedTech above Spec this 3.2-3, point. Iten 10, requires actuation at 510 psig. All switthes 14.2 and 13.4 psig respectively. E51-N012A, B, C and D actuated at 10.4, 11.25, Immediate Corrective Action:

All RCIC Turbine bhaust Diaphragu High Pressure Switches were recalibrated per HNP-1-5279, Barksdale Pressure Switch Calibration Prot.adure,and are now ,

within the acceptable tolerances es allowed per Tech Specs.

Cause:

Setpoint drif t can be attributed as the cause of this occurrence.

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Supplemental CorrectiveJetic;n:

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An inve,11 9 ation is underway to deterwine if these switches can be replaced wl:;

more reliabic switch. E Status of Redundant or Beckup Systers:

All ECCS systews were operable and capable of perfornir3 their intended function.

Luiaivaa u me A a n laWa u n.u. nit a u H.ws a u u,us M u uw'snu uswn inne nmenm um.m. m.u,ie u me .

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Impact to Other Un!_t_s:

This occorrence is applicable to Unit 11 because Unit II uses the sarre type of Barksdale Pressure Switches for RCIC Turbine Exhaust Diaphrage. High Pressure.

HNP-2-3414 was performed on Septer4ber 1$,1931, with satisfactory results.

Justification for Continued Operation:

Continued operation is justified due to the recalibration of the RCIC Turbine Exhause Diaphragm High Pressure Switches.

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