Operating limits Hanford Production Reactors. Revision 2 Page: 20 of 26
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flr ~ Hw-76327 RD Rev 2
Page 16
bypassing individual pressure monitor trips when the coolant pressure or
exit temperature of the affected channel is under continuous surveillance.
The system shall not be bypassable when the reactor power level exceeds
approximately 0.1 per cent of the normal operating power level.
5. Earthquake
Seismoscopes shall be set to trip upon detection of an earthquake having
an intensity of four on the Modified Mercalli Scale. Exceeding trip
settings on two out of three seismoscopes shall actuate the No. 1 Safety
Circuit. Manual bypass may be available0
6. Electrical Power Loss
Electrical power failure shall actuate the No. 1 Safety Circuit.
7. In-Reactor Test Loops
Special procedures shall be provided for operation of in-reactor test
loops. Instrumentation and set points will be variable depending on
function and complexity of the loop. Set points will be provided to shut
down the reactor under conditions established by Administrative Procedures.
J. Control Criteria for Hanford Production Reactors
1. Total Control
The operation of the Hanford reactors shall be such that in the event " y
any credible combination of events, and including complete and permanent
loss of coolant, the total control strength will be sufficient to ensure
that no reactivity state will develop which would significantly increase
the consequences of the accident.
2. Speed-of-Control
The operation of the Hanford reactors shall be such that in the event of a
power excursion resulting from any credible combination of events, and.. ,. "t '"=7rr, _ ::amsJ " r'; : ..=a'L'.. ... 'r?'"^^-;" T wS.-z^Tt3 - .<r rr ;: t.'
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Owsley, G. F. Operating limits Hanford Production Reactors. Revision 2, report, May 20, 1963; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc1277579/m1/20/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.