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XVIII Annual Meeting of the Spanish Nuclear Society
Puerto de Santa Maria. Spain
October 28-30. 1992
RISK EFFECTIVENESS EVALUATION
OF SURVEILLANCE TESTING
S. Martorell, I.S. Kim and P.K Samanta, W.E. Vesely"
Department of Ingenierfa Quimica y Nuclear
UNIVERSIDAD POLITECNICA DE VALENCIA
PO BOX 22012, 46071 VALENCIA, SPAIN
'Brookhaven National Laboratory, New York, USA
"Science Applications International Corp., Ohio, USA
In nuclear power plants surveillance tests are required to detect failures in standby
safety system components as a means of assuring their availability in case of an accident.
However, the performance of surveillance tests at power may have adverse impact on
safety as evidenced by the operating experience of the plants. This aspect becomes
aggravated due to the volume and frequency of the present surveillance requirements.
In order to look at the problem with surveillance requirements in its proper
perspective, the risk effectiveness or safety significance of surveillance tests should be
evaluated. The risk associated with a test includes two different aspects: 1) a positive
aspect, i.e., risk contribution detected by the test, that results from the detection of
failures which occur between tests and are detected by the test, and 2) a negative aspect,
i.e., risk contribution caused by the test, that includes failures and degradations which are
caused by the test or are related to the performance of the test. In terms of the two
different risk contributions, the risk effectiveness of a test can be simply defined as
follows: a test is risk effective if the risk contribution detected by the test is greater than
the risk contribution caused by the test; otherwise it is risk ineffective.
Typically, the risk evaluation of surveillance tests has concentrated on the positive
aspect with a qualitative consideration of the negative aspects.
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Martorell, S.; Kim, I. S. (Universidad Politecnica de Valencia (Spain). Dept. de Ingenieria Quimica y Nuclear); Samanta, P. K. (Brookhaven National Lab., Upton, NY (United States)) & Vesely, W. E. (Science Applications International Corp., Columbus, OH (United States)). Risk effectiveness evaluation of surveillance testing, article, July 20, 1992; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc1444884/m1/3/: accessed April 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.