ML19256A685

LER 78-126/03L-0 on 781206:during Monthly Test One of the Heat Tracing Channels of the Boron Injection Sys Was Found Inoperable.Caused by Open Circuit in a Boron Injection Tank Heater, Caused by Defective Cable

ML19256A685
Person / Time
Site:	North Anna
Issue date:	01/03/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19256A683	List: ML19256A682 ML19256A685 ML19256A692 ML19256A697 ML19256A701 ML19256A704
References
LER-78-126-03L, LER-78-126-3L, NUDOCS 7901090206
Download: ML19256A685 (2)

Text

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tracing channels of the boron injection system was inoperable. This is :ontrary to l

T .S. 3.5.4.2. The redundant channel was checked and placed in operation and baron j g , g temperature monitored as required by the appropriate Action Statement. This event is g reportable as per Y.3. 6.9.1.9.b. g

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] A QlM 0l8l0lg 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 1 O lThe cause of the channel inonerability was an open circuit in a boron iniection i 11 lii tank hoater which was caused by a defective heator cable. The redundant ch arinel was 1 1 7 lplaced into operation. The defective cable was replaced and the original heat traci nal I

l i l 3 ] l channel was returned to oneration.

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' 8 9 W. R. Cartwright PHONE:

703-894-5151 iE F f\EP ARFR 7g

Virginia Electric and Power Company North Anna Power Station, Unit #1

Attachment:

Page 1 of 1 Docket "o. 50-338 Report .4o. LER 78-126/03L-0 Description of Event:

vn 12/06/78 during the performance of a periodic test, it was discovered that one of the heat tracing channels of the boron injection system was inoperable.

This is contrary to T.S. 3.5.4.2.

The redundant heat trace channel was ini tiated and boron temperature moni-tored as required by the appropriate Action Statement.

This event is reportable as per T.S. 6.9.1.9.b.

Probable Consequences of Occurrence:

The operability of the redundant heat tracing channels associated with the boron injection system, ensure that the solubility of the boron solution will be maintained above the solubility limit of 137 F at 22,500 ppm boron, Since the redundant heat tracing channel was operable and the boron tempera-ture monitored and maintained above 137 F, there was no effect upon the safe operation of the plant.

Consequently, at no time was the public health and safety endangered.

Cause of Occurrence:

The cause of the heat tracing channel being inoperable was an open heater circuit in the boron injection system. The heater circuit was open because of a defective heater cable.

Immediate Corrective Action:

The redundant heat tracing channel operability was checked and it was placed into operation. The boric acid transfer pump operability was also checked.

Scheduled Corrective Action:

The heater circuit was repaired by replacing the defective heater cable.

The heat tracing channel periodic test was performed and the channel returned to operation.

Action Taken To Prevent Recurrence:

No further corrective action was required.