ML20064M597
| ML20064M597 | |
| Person / Time | |
|---|---|
| Site: | Clinch River |
| Issue date: | 02/14/1983 |
| From: | Longenecker J ENERGY, DEPT. OF, CLINCH RIVER BREEDER REACTOR PLANT |
| To: | Grace J Office of Nuclear Reactor Regulation |
| References | |
| HQ:S:83:214, NUDOCS 8302150588 | |
| Download: ML20064M597 (2) | |
Text
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Department o.' Energy Washington, D.C. 20545 Docket No. 50-537 HQ:S:83:214 FEB 141983 Dr. J. Nelson Grace, Director CRBR Program Office Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Dear Dr. Grace:
ADDITIONAL INFORMATION REGARDING THE NITR0 GEN GAS SERVICES SYSTEM -
CLINCH RIVER BREEDER REACTOR PLANT Enclosed is a marked-up Preliminary Safety Analysis Report (PSAR) page providing additional information on nitrogen gas services. This infor-mation will be placed into Chapter 9 of the PSAR in a future amendment.
Any questions regarding the information provided may be addressed to Mr. D. Robinson (FTS 626-6098) or Mr. S. Mitchell (FTS 626-6183) of the Project Office Oak Ridge staff.
Sincerely, John R. Longenecker Acting Director, Office of Breeder Demonstration Projects Office of Nuclear Energy Enclosure cc: Service List Standard Distribution Licensing Distribution
- 2001 8302150588 830214 PDR ADOCK 05000 A
ENCLOSURE While one of the loops of this unit operoles, the other loop is regenerated by
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flowing mixed argon-5% hydrogen gas through the molecular sieve cryer and then through the copper bed to reduce copper ex!de. The water produced by this purge and reaction is removed by the unit vacuum pump to CAPS.
i 9.5.2 Nitrogen Distribution Svstem c
9.5.2.1 Design Basis Nitrogen is to be suppli.ed for (1) cooling and inerting the atmospheres of the cells and pipeways containing radioactive sodium and the Control Rod Drive Mechenism, (2) actuating pneumatically-operated valves in the inerted cells, (3) cover gas for the Dowtherm tanks in the chilled water system, ( 4) purging the IHTS steam generators and evaporators in the event of a sodium-water reaction, (5) primary Na removal and autoclave operations, (6) purging of the RADS and CAPS cold boxes, (7) a cover gas for the Sodium Water Reaction Pressure Relief System (SWRPRS), and (8) miscellaneous handling and maintenance services.
The SGB nitrogen supply for the sodium-water reaction purge is sized to provide 250 scfm of nitrogen for a maximum of 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
The SGB nitrogen supply rate to be available for the RG and RSB cell purge requirements is to be 250,000 scfd.
The oxygen content of a nitrogen inerted cell is to be limited to 0.5 to 2.0%,
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and the water vapor concentration to less than 1000 vppm.
The oxygen Iimits are chosen to provide enough oxygen to prevent nitriding of the steel, and yet not exceed a fire-Iimiting concentration of oxygen.
The water vapor is limited in order to assure early detection in the event of a small sodium leak.
To meet these limits the nitrogen subsystem contains two sampling and analysis units, one for the RSB and the other for the RG which periodically samples the gas in each nitrogen-Inerted cell and analyzes its atmospheres for radioactivity, oxygen, and water vapor content. The cell is purged automatically by fresh nitrogen whenever the oxygen level exceed 2% or the water vapor concentration exceed 1000 vppm (one of these, by operator selection) as monitored by the respective sampiIng and analysis unit.
If, as -
the result of purging to reduce the water vapor level, the oxygen concentration f alls below 0.5%, dry exygen f rom a gas supply bottle will be Introduced manually into the af fected cell at a tap provided for this purpose.
The RSB sampling unit causes the cell exhaust gases to be diverted to CAPS If they are' radioactive, or to be diverted to heating and ventilating if they are not radioactive.
All RG Inerted cells are normally exhausted to CAPS, ar.d an alarm is sounded when a high amount of radioactivity is detected.
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'g,5-6 Amend. 64 J an. 1982