05000302/LER-1979-053-03, /03L-0 on 790523:while Performing Operability of Boron Injection Sources & Pumps,Heat Trace Recorder Failed Rendering Boron Injection Inoperable.Caused by Loose Drive Cord.Cord Reinstalled & Recorder Returned to Svc

/03L-0 on 790523:while Performing Operability of Boron Injection Sources & Pumps,Heat Trace Recorder Failed Rendering Boron Injection Inoperable.Caused by Loose Drive Cord.Cord Reinstalled & Recorder Returned to Svc

ML19263E805
Person / Time
Site:	Crystal River
Issue date:	06/13/1979
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19263E804	List: 05000302/LER-1979-053, Forwards LER 79-053/03L-0 05000302/LER-1979-053-03, /03L-0 on 790523:while Performing Operability of Boron Injection Sources & Pumps,Heat Trace Recorder Failed Rendering Boron Injection Inoperable.Caused by Loose Drive Cord.Cord Reinstalled & Recorder Returned to Svc
References
LER-79-053-03L, LER-79-53-3L, NUDOCS 7906250298
Download: ML19263E805 (2)

LER-1979-053, /03L-0 on 790523:while Performing Operability of Boron Injection Sources & Pumps,Heat Trace Recorder Failed Rendering Boron Injection Inoperable.Caused by Loose Drive Cord.Cord Reinstalled & Recorder Returned to Svc

Event date:
Report date:
3021979053R03 - NRC Website

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SUPPLEMENTARY INFORMATION Report No.:

50-302/79-053/03L-0 Facility:

Crystal River Unit #3 Report Date:

13 June 1979 Occurrence Date:

23 May 1979 Identification of Occurrence:

Both boron injection flowpaths inoperable contrary to Technical Specification 3.1.2.1.

Conditions Prior to Occurrence:

Mode 6 refueling.

Description of Occurrence:

At 0330, while performing Surveillance Procedu'e SP-320, Opera-bility of Boron Injection Sources and Pumps, it was discovered that Heat Trace Recorder, HTRT-5, which monitors the concentrated boric acid flowpath, was not printing. This rendered the con-centrated boric acid flowpath inoperable.

The borated water storage tank supply was also inoperable due to the boron con-centration being 21 ppm below the Technical Specification limit of 2270 ppm.

The heat trace recorder HTRT-5 was restored operable through maintenance at 1745 on 25 May 1979.

Designation of Apparent Cause:

The cause of this event is attributed to a loose recorder drive cord.

Analysis of Occurrence:

No effect upon public health and safety as the plant was in a safe shutdown condition. Core alterations were not in progress during the time of this event.

Corrective Action

The drive cord was replaced and HTRT-5 was returned to service following satisfactory completion of SP-320.

Request for Engineer-ing Information 78-10-4 to incorporate independent concentrated boric ac.t suction and discharge lines, and 79-5-1 to evaluate recorder reliability, have been submitted.

Further corrective actions will be based upon the results of these evaluations.

Failure Data:

This is the third occurrence reported for HTRT-5.

Reference LER's 79-17 and 79-30.

2214 357

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