Periodic Radiation Survey of Reactor Plant Container and Components After Shutdown, "I" Survey. Core 1, Seed 1. Section 2. Test Results T-612076 Page: 4 of 23
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PERIODIC RADIATION SURVEY OF REACTOR PLANT CONTAINER
AND COMPONENTS AFTER SHUTDOWN
CORE I SEED 1
To measure the radiation level and its decay at expected "hotspots" in the Reactor
Container, lAC and 1BD Boiler Containers, and Pressurizer Cubicle after' the Plant
shutdown for Refueling of Core I. A total of 5886.EFPH had been accumulated on
Seed 1, Core I.
Initial radiation measurements indicated relatively high radiation levels in certain
areas. Maximum initial readings were 500 mr/hr, 400 mr/hr, 530 mr/hr and 195 mr/hr
in the Reactor Container, lAC Boiler Container, 1BD Boiler Container and Purification
Cubicle respectively. Over a 100 hour period, radiation levels showed a general
decrease, although a few points maintained a relatively high level. Radiation mea-
surements made 1000 hours after a shutdown indicated an increase in activity at most
points. Also the measured levels at selected points, as plotted in Figures 1, 2 and
3, seem to indicate lower radiation levels at this performance than those obtainedAin
previous surveys. These anomalisms are..robably Attributable'to the .iEiv"'ters
used. Draining a reactor coolant loop seemed to have no effect on the radiation
The decay curves indicate that the radiation level is due to the ;decay of more than
one isotope and that there is a build-up of. long-lived decay products.
The results of other tests indicate tgat the primary source of activity during the.
1000 hour and 2000 hour surveys is Co O (half life = 5.2 yrs.)
Description of Test Equipment and.Test Procedure
Portable Jordan survey meters were used throughout the test to determine the ra-
..diation levels at expected "hotspots" in the Reactor Container, Boiler Containers,
and Pressurizer Cubicle at specified intervals over a 2000 hour period following
Plant shutdown. At most survey points there was a metal can in which the probe of
the survey meter could be inserted to insure consistent readings. The test began
approximately two (2) hours after all rods were bottomed. The 1D reactor coolant
loop was not monitored because it was out of service prior to Plant shutdown.
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Periodic Radiation Survey of Reactor Plant Container and Components After Shutdown, "I" Survey. Core 1, Seed 1. Section 2. Test Results T-612076, report, October 17, 1960; Shippingport, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc872852/m1/4/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.