ML20066J416
| ML20066J416 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 01/28/1991 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20066J407 | List: |
| References | |
| NUDOCS 9101310239 | |
| Download: ML20066J416 (3) | |
Text
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UNITED STATES 3e g
NUCLEAR REGULATORY COMMISSION r,
f WASHINGTON, D. C. 20555
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO. 145 TO PROVISIONAL OPERATING LICENSE NO. DPR-16 GPU NUCLEAR CORPORATION AND JERSEY ~ERTRKETUE'& l LIGHT COMPANY OYSTER CREEK _ NUCLEAR GENERATING STATION DOCKET NO. 50-219 INTRODUCTION By an application for amendment dated Septeiroer 21, 1990 GPU Nuclear Corporation (GPUN/ licensee) requested a revision of the Technical Specifi-cation (TS) tu Provisional Operating License No. DPR-16 for the Oyster Creek Nuclear Generating Station. The )roposed change extends the channel calibration interval from 18 montis to 24 months for Items 2a, 2d, 3a, and 3d of Table 4.15.2.
Items 2a and 2d provide surveillance requirements for the Main Stack Radioactive Noble Gas monitors and the associated effluent flow element.
Items 3a and 3d provide surveillance requirements for the Turbine Building Ventilation Radioactive Noble Gas monitors and flow element.
The proposed surveillance interval is intended to support a 24-month refueling cycle at Oyster Creek. GPUN's request to revise License Condition 2.C.7 of Provisional Operating License No. DPR-16 was evaluated as a separate and Amendment No.143 was issued on December 27, 1990.
l 2.0 EVALUATION The Radioactive Gaseous Effluent Monitoring S.ystem was installed at Oyster Creek Nuclear Generating Station to replace the stack gas monitoring system in response to NUREG 0578 and NUREG 0737. This evaluation encompasses the low range noble gas monitors and associated flow elements for both the Main Stack and Turbine Ventilation Monitoring Systems.
The Radioactive Gaseous Effluent Instrumentation is provided to monitor the release of radioactive materials in the effluent discharged from the Main Stack and Turbine Building Exhaust Ventilation Systems. The Main Stack Monitoring System has alarms which annunciate in the contrul room. A low flow signal for sampled stack effluent also causes a control room alarm. The Turbire Ventilation Monitoring System measures the radioactive releases from the feedwater pump area and operating floor. A flow transmitter provides indication of air flow in the ventilation stack. Both the Main Stack and l
Turbine Building Ventilation Monitoring Systems are information systems only and do not provide any control functions.
The Main Stack and Turbine Building Ventilation Noble Gas Monitoring Systems require daily channel checks, monthly source checks, monthly channel functional tests, and calibration every 18 months. The 18-month calibration 9101310239 910129 PDR ADOCK 05000219 P
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-2 verifies the system to a source of known radioactivity with differing decay energies, to ensure that the sensor has not degraded.
The Main Stack and the Turbine Building Ventilation Noble Gas Monitoring Systems effluent flow measurements are recorded daily. A functional test is performed every 3 months to verify the flow indicator response to varying flow rates and test the loss of flow alarm response. The flow elements are also required to be calibrated every 18 months per TS requirements. The stack flow transmitter is used to adjust the sample flow to 220% of stack flow. The licensee stated that the solid state electronics used in the flow element exhibit negligible drif t at 18-month intervals and are expected to exhibit an insignificant increase in drif t for a 24-month interval.
Outage surveillance data history has not been est6blished due to the recent installation of these systems. The monthly source check and quarterly functional test results were reviewed by the licensee.
The results of this evaluation did not indicate any adverse trends.
Both the Main Stack and Turbine Building Radioactive Noble Gas Monitors have perforraed reliably. The licensee reviewed the Huchar plant Reliability Data System and found no related systen reliability information.
Both the Main Stack and Turbine Building Ventilation Monitoring Systems undergo daily channel checks, monthly source checks, and quarterly functional tests in additiun to tha 18-month calibration. These surveillances were not revind by this submittal and will continue to ensure system operability. As stated by the licensee the flow element will allow for accurate sample flow calibration over the proposed 24-month surveillance interval.
A review of the results of the monthly source check and quarterly functional tests by the licensee four d no adverse trendt.
The licensee has agreed that since these systems were installed recently, the licensee will initiate means to collect and trend the required data to ensure that the extended surveillance interval is appropriate for the referenced systems.
Based on the above the staff finds the proposed 24-month surveillance interval for the Main Stack Radioactive Noble Gas monitors, Turbine Building Ventilation Radioactive Noble Gas monitors and associated flow elements to be acceptable.
gv!RONMENTALCONSIDERATION Pursuant to 10 CFR 51.21, 51.32 and 51.35, an environmental assessment and finding of no significant impact have been prepared and published in the Federal Register on January 23 1991 (56 FR 2543).
Accordingly, based upon the environmental assessme,nt, we have determined that the issuance of the amendment will not have a significant effect on the quality of the human enyironment.
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. CONCLUSION The staff has concluded, based on the consideratiuns discussed above, that (1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, and (2) such activities will be concucted in compliance with the Coninission's regulations, and (3) the issuance of the amenornent will nLt be inimical to the common defense and security nor to the health and safety of the public, Dated:
January 28, 1991 Principal Contributor:
C. Doutt
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