L-2004-052, Technical Specification Special Report Regarding Radwaste Building Exhaust System Plant Ventilation Exhaust Monitor - Out-of-Service

Technical Specification Special Report Regarding Radwaste Building Exhaust System Plant Ventilation Exhaust Monitor - Out-of-Service

ML040620448
Person / Time
Site:	Saint Lucie
Issue date:	02/23/2004
From:	Jefferson W Florida Power & Light Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
L-2004-052
Download: ML040620448 (2)

Text

0FPRL Florida Power & Light Company, 6501 S.Ocean Drive, Jensen Beach, FL 34957 February 23, 2004 L-2004-052 10 CFR 50.36 U. S Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 Re: St. Lucie Unit 1 Docket No. 50-335 Technical Specification Special Report Date of Event: February 10, 2004 Radwaste Building Exhaust System Plant Ventilation Exhaust Monitor - Out of Service The attached Special Report is being transmitted pursuant to the requirements of St. Lucie Unit 1 Technical Specification 3.3.3.1, Radiation Monitoring Instrumentation, and pursuant tQ Technical Specification 6.9.2, Special Reports. This report provides notification that the plant vent stack radiation monitor was out of service for greater than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> and the plans taken to restore the monitor channel to service. The plant vent monitor was repaired and returned to service on February 19, 2004.

Should there be any questions on this information, please contact George Madden at (772) 467-7155.

Very truly yours,

¶~iliam Jeff~ss Jr.

SiV Preti ent St. ii ant WJ/GRM Attachment D,  %

an FPL Group company

St. Lucie Unit I Docket No. 50-335 L-2004-052 Attachment BACKGROUNDIEVENT DESCRIPTION:

Condition Report (CR) 04-0576 was written due a loss of the St. Lucie Unit 1 plant vent stack radiation monitor, RSC-26-1, on February 10, 2004. Maintenance could not repair the monitor within the required 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> and instituted a preplanned alternate means of monitoring plant vent effluents in accordance with Chemistry Operating Procedure COP-06.10 and Plant Technical Specification 3.3.3.1, Table 3.3-6 Action 15.

Plant maintenance technicians investigated the condition and returned the monitor to service on February 19, 2004. This report provides the special report in accordance with Specification 6.9.2 within 14 days following the event.

The Plant Vent, ECCS and FHB Radiation Monitors (RSC-26-1, 2, 3 & 4) are described in the St. Lucie Unit 1 FSAR Section 11.4.

These effluent radiation monitors consist of a three stage particulate, iodine and noble gas monitor extending from the normal range, 10E-7 to 10E-2 pCi/cc, to the upper limit of 10E5 pCi/cc of Xe-133 equivalent. The primary purpose of the effluent monitors is to continuously monitor and record the radioactivity level of plant effluent gases being discharged from the plant to assure that the plant releases do not exceed Technical Specifications limits.

Technical Specification 3/4.3.3 also discusses these monitors and requires that they be operable in Modes 1-4. RSC-26-1, Plant Vent Effluent Radiation Monitor, is the only device that measures normal and accident radiation levels that are released at the plant vent. Chemistry procedure C-200, Offsite Dose Calculation Manual (ODCM), also addresses these effluent monitors and the setpoints to be utilized.

SPECIAL REPORT

• Action taken:

The fuel handling building effluent monitor RSC-26-4 was aligned to sample plant vent effluents in accordance with the preplanned alternate method of sampling.

• Cause for inoperability:

The plant vent radiation monitor exhibited intermittent central processing unit (CPU) and sample pump failures causing the monitor to become inoperable. After extensive troubleshooting the causes were isolated to a faulty ribbon cable and degraded (low) power supply voltage in the CPU.

• Plans and schedule for restoration:

The plant vent monitor was repaired and returned to service on February 19, 2004.