EFFECT OF APPR-1 CONTROL ROD ACCELERATION AFTER SCRAM ON STARTUP ACCIDENT

Gallagher, J.G.; Silks, T.M.

doi:10.2172/4351381

EFFECT OF APPR-1 CONTROL ROD ACCELERATION AFTER SCRAM ON STARTUP ACCIDENT

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In the preoperational checkout of the APPR-1 it became apparent that the control rod acceleration after scram was lower than expected. It was expected that the control rod acceleration after scram would be 0.750 g(1) where g is the acceleration of gravity. However, measurements made at Ft. Belvoir indicated an acceleration of 0.4 g. The effect of this reduced acceleration on the safety of the APPR1 is reported in this memo. In the operation of the APPR1 the most dangerous condition exists at cold startup. Therefore the behavior of the APPR-1 in a startup accident with a rod acceleration of … continued below

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17 pages

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Gallagher, J.G. & Silks, T.M. April 23, 1957.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by the UNT Libraries Government Documents Department to the UNT Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 26 times. More information about this report can be viewed below.

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Mallinckrodt Chemical Works (Saint Louis, Mo.)
Place of Publication: St. Louis, Missouri

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Description

In the preoperational checkout of the APPR-1 it became apparent that the control rod acceleration after scram was lower than expected. It was expected that the control rod acceleration after scram would be 0.750 g(1) where g is the acceleration of gravity. However, measurements made at Ft. Belvoir indicated an acceleration of 0.4 g. The effect of this reduced acceleration on the safety of the APPR1 is reported in this memo. In the operation of the APPR1 the most dangerous condition exists at cold startup. Therefore the behavior of the APPR-1 in a startup accident with a rod acceleration of 0.4 g after scram is considered. Analysis of the most adverse startup accident in the APPR-1 indicated that at the 15 Mw level scram the reactor is on a 33 ms. period. Rod insertion begins after a 50 ms. instrument delay, at which time the power is 80 Mw. The maximum power reached with a rod acceleration of 0.4 g is 96.5 Mw. The total energy released is about 5.8 a 10/sup 3/ Btu which is far below the 8 x 10/sup 4/ Btu which would result in melting at the center line of the fuel element (and probable core destruction). If the rod acceleration were 0.759 g the maximum power would be between 80 and 90 Mw so that the reduced acceleration does not constitute any significant increase in energy release on a starting accident. (auth)

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17 pages

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Other Information: Decl. Mar. 13, 1958. Orig. Receipt Date: 31-DEC-58

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English

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Report No.: APAE-Memo-97
Grant Number: AT(11-1)-318
Digital Object Identifier: https://doi.org/10.2172/4351381
Office of Scientific & Technical Information Report Number: 4351381
Archival Resource Key: ark:/67531/metadc1022096

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April 23, 1957

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Oct. 15, 2017, 10:09 p.m.

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July 30, 2019, 12:29 p.m.

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Gallagher, J.G. & Silks, T.M. EFFECT OF APPR-1 CONTROL ROD ACCELERATION AFTER SCRAM ON STARTUP ACCIDENT, report, April 23, 1957; St. Louis, Missouri. (https://digital.library.unt.edu/ark:/67531/metadc1022096/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

EFFECT OF APPR-1 CONTROL ROD ACCELERATION AFTER SCRAM ON STARTUP ACCIDENT

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