ML20064F726

/03L-0 on 781107:during 1-pt-134 Periodic Test, MOV-QS102A Would Not Return to Normal Closed Position Because of Dirty Contacts on Valve'S Torgue Switch.Contacts Were Cleaned

ML20064F726
Person / Time
Site:	North Anna
Issue date:	11/27/1978
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML20064F721	List: ML20064F720 ML20064F722 ML20064F726 ML20064F733 ML20064F740
References
LER-78-115-03L, LER-78-115-3L, NUDOCS 7812040213
Download: ML20064F726 (2)

Text

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l O I 2 l 10n November 7. 1978. with the unit in normal oneration (95.2% nower). 1-PT-134 was l l 0 l a i iperformed as scheduled. During the performance of the periodic test MOV-OS102A l i

O 4 lwould not return to its normal closed position as recuired by Technical Snecification 1

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44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h I i l o I frhe cause for MOV-OS102A not closing was due to dirty contacts on the valve's torque l ll lil bwitch. An emergency maintenance report was submitted and the contacts were cleaned l M lper procedure EMP-C-LS-1. No scheduled or preventive actions are required for the l i a ltorque switch contacts. 'l li l41 I l 7 8 9 80 ST S  %*OWER OTHER STATUS IS OV Y DISCOVERY DESCRIPTION l t ls I d@ l 0 l 9 l 5 lhl NA l l B l@l Periodic Testing l AC11VITY CO TENT I RELEASEO OF RELEASE AMOUNT OF ACTIVtTY LOCATION OF RELEASE l NA l NA Li_l.6](Z_jhlZl@11 7 8 9 10 44 l

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Attachment:

Page 1 of 1 Docket Number 50-338 Report No. LER 78-115/03L-0 Description of Event On November 7,1978, with the unit in normal operation (95.2% power), Periodic Test 1-PT-134 was performed as scheduled. During the test, which requires the chemical addition tank discharge valves to be cycled, M0V-QS102A opened but would not return to its normal closed position. Technical Specification Statement 3.6.2.3 requires that all valves in the chemical addition flow path be in its correct posi-tion. Not being able to meet this technical specification, an emergency maintenance report was submitted to repair Chemical Addition Tank Discharge Valve MOV-QS102A.

Probable Consequences of Occurren'ce The public health and safety were not endangered by the inability of M0V-QS102A to close since the valve must be opened when this system actuates.

Causes of Occurrence The reason for M0V-QS102A not closing was the direct result of dirty contacts on the valve's torque switch. The dirty contacts allowed the valve to remain open when a signal to close the valve was received.

Immediate Corrective Action Once it was determined that MOV-QS102A was unable to close, an emergency maintenance report was submitted to the electrical shop. The work that was performed under the maintenance report was to clean the torque switch contacts on M0V-QS102A per procedure EMP-C-LS-1. M0V-QS102A was retested with satisfactory results.

Scheduled Corrective Action None required.

Actions Taken to Prevent Recurrence This appears to be an isolated event, therefore no further action is required.

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