ML19256E497

LER 79-096/01T-0:on 790780,vol of Sodium Hydroxide Tank Exceeded Tech Spec,But Not Reported.Caused by Inadequate Design.Daily Operating Surveillance Procedure SP-300 Revised to Include Operating Band Requirement

ML19256E497
Person / Time
Site:	Crystal River
Issue date:	10/26/1979
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19256E484	List: ML19256E483 ML19256E497
References
LER-79-096-01T, LER-79-96-1T, NUDOCS 7911070531
Download: ML19256E497 (3)

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SUPPLEMENTARY INFORMATION Report No.: 50-302/79-096/0lT-0 Facility: Crystal River Unit #3 Report Date: 26 October 1979 Identification of Occurrence:

Sodium hydroxide tank BST-2 inoperable contrary to Technical Specification 3.6.2.2 and reportable under Section 6.9.1.8.b.

Conditions Prior to Occurrence:

Mude 1 pcwer operation (100%)

Description of Occurrence:

It was determined at 1530 following a discussion with the onsite NRC inspector that a previous event, discovered on 8 July 1979 and evaluated not reportable, en-uld have been reported contrary to Techaical Specification 3.6.2.2 and reported under Section 6.9.1.8.b.

On 8 July 1979, in Mode 5, it was discovered that the level of the Na0H tank (BST-2) was being maintained at a volume greater than Technical Specification limit. Further investigation re-vealed that level transmitter BST-2-LT was calibrated with a zero reference point two (2) feet above the tank discharge. The usable volume provided by the additional two feet resulted in the level exceeding the limit. This event was not reported initially due to a misinterpretation of reporting requirements involving limiting conditions for operation and their applicable Mode requirements.

The event involving BST-2 was discovered and corrected before entering into the applicable Mode.

Designation of Apparent Cause:

The cause of this event is attributed to inadequate design. The existing design did not provide adequate indication of useable tank volume.

Analysis of Occurrence:

No effect upon the plant or general public. The level of BST-2 was brought to within specification limits prior to entering into Mode 4.

Corrective Action:

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Daily operating Surveillance Procedure, SP-300, was revised to in-clude an operating band requirement that will maintain the NaOH tank volume within the Technical Specification limits. In addition, re-sponsible personnel have been instructed in regard to the reporting requirements for events of this type. Future events will be evalu-ated in this regard and reported aoproprit.tely.

Supplementary Information 50-302/79-096/01T-0 Page 2 Failure Data: This is the first occurrence of this type reported.

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