ML19263C538

LER 79-010/03L-0 on 790127: During Calibr of Containment Particulate Monitor RMS159 in Mode 1, Instrument Read Low for Known Radiation Level. Caused by Detector High Voltage Setting Being Set Too Low

ML19263C538
Person / Time
Site:	North Anna
Issue date:	02/20/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19263C534	List: ML19263C533 ML19263C538 ML19263C540
References
LER-79-010-03L, LER-79-10-3L, NUDOCS 7902260453
Download: ML19263C538 (2)

Text

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74 75 RE FODI DATE 80-E OU bl DOCFE T NUMe[H EVEN T DESCRIPTION AND PHOB ABLE CONSEQUENCES h g.g l While performing periodic calibration of Containment particulate nonitor RMS159 in j o 3 [ Mode 1, it was found that the instrument read low for a known radiation level. This I o 4j monitor was declared inoperable for RCS leak detection an'! the appropriate grab

ol3; samples were taken as required by the T.S. 3.4.6.1 Action Statement. Reportable I o o pursuant to T.S. 6.9.1.9.b. I FIB L I FOrirl 80 I

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[g 41 lN g 42 lL l@ lW l1 l2 l0 g 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i o lThe detector high voltage setting was found to be low. It was adjusted up so that l

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Attachment:

Page 1 of 1 Docket No.: 50-338 Report flo. : LER 79-010/03L-0 Description of Event:

On 1/27/79 while performing routine calibration of RMS-159, Containment Particulate Radiation fionitor, it was found that the detec tor read low for a known radiation level. The monitor was declared inoperable for RCS leakage detection and the appropriate grab samples were taken as required by the Action Statement of T.S. 3.4.6.1.

Pr_obable Consequences of Event:

RMS-159, Containment Particulate Radiation Monitor, is utilized as Reactor Coolant System leakage detection system during Mode 1 operation. Two other systems were available and grab samples were taken and this monitor was restored to operation within the 30 day period required by the Action statement (T.S. 3.4.1.6). Therefore, the health and safety of the general public were not endangered.

Cause of Occurrence:

This event was caused by a detector high voltage setting that was too low.

Immediate Corrective Action:

The immediate corrective action was the adjustment of the detector high voltage so that proper readings were obtained for a known radiation source.

The instrument was calibrated satisf Lorily.

Scheduled Corrective Action:

None Action Taken to Prevent Recurrence:

None