ML19341C201
| ML19341C201 | |
| Person / Time | |
|---|---|
| Site: | 05000192 |
| Issue date: | 02/24/1981 |
| From: | TEXAS, UNIV. OF, AUSTIN, TX |
| To: | |
| Shared Package | |
| ML19341C200 | List: |
| References | |
| NUDOCS 8103020372 | |
| Download: ML19341C201 (2) | |
Text
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Specification The area radiation monitoring system, the continuous air monitoring system, and the exhaust monitoring system shall be calibrated semi-annually, but at intervals not to exceed 8 months, and shall be verified to be operable at weekly inte rvals.
Basis Frequent insper.cion by weekly verification of area radiation and an air monitoring system set points, in conjunction ilth semi-annual calibration is adequate to correct for any varia-tion in the system due to a change of operating characteristics over a long time span.
4.2.4 Pool Water Systems Applicability This specification applies to the reactor pool water tank, heat exchanger cooling system and purification system.
Objective The objective is to maintain pool water level and quality to assure adequate core cooling, core radiation shielding, and control of water corrosion and activation properties.
Specification a.
Pool water conductivity shall be sampled at least weekly. The conductivity shall not exceed 6 micro-mhos per centimeter averaged over a month.
b.
The reactor normal pool level shall be verified daily when the heat exchanger chilled water inlet and outlet block valves are open.
c.
During periods when operators are not present in the laboratory, the heat exchanger primary pump will be shut down and the chilled water inlet and outlet block valves closed.
Bases The specification for pool water conductivity assures that potential corrosion products and water activation are con-trolled at acceptable levels.
The specifications on heat exchanger operation establish that reactor pool level conditions are monitored by qualified personnel to detect abnormal operation.
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b.
The laboratory air ventilating system shall be contained and shall circulate air within the confines of the reactor room. Air and exhaust gases from the reactor room shall be released to the environment only as a result of leakage through doors, etc.
c.
The reactor building shall be equipped with an exhaust system to filter and exhaust air or other gases from the reactor room and release them from a stack at a minimum of 4.5 meters from roof level.
d.
The exhaust system shall be operated when continuous reactor operation time exceeds 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> at a power level chat exceeds 100 kilowatts.
e.
Emergency shutdwon controls for the exhaust system shall be located at the laboratory entrance and the system shall be designed to shu': awn in the event of substantial release of fission products. The room ventilation system and adjacent area ventilation systems will be manually shutdown.
f.
The pneumatic transfer system shall be a closed loop carbon dioxide filled system.
Bases The facility is designed to restrict leakage from the reactor room by a closed room air condition and heating system. A filtered exhaust system with automatic shutdown on high radiation alarm provides additional control of leakage during extended periods of high power operation or experiment conditions with excessive argon release rates.
Isolation of the exhaust system is automatic on high radia-tion alarm with start /stop control of the system located at the laboratory entrance. The room and adjacent area venti-lation units are manually s.hutdown by controls near the laboratory entrance to further restrict leakage rates if
. airborne radioactivity is excessive. A closed loop carbon dioxide pneumatic transfer system further limits the potential activity to be released to laboratory areas.
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