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ANS 19.6.1

ANS 1961 2011-JAN-01 Reload Startup Physcs Tests for Pressurzed Water Reactors

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This standard applies to the reactor physics tests that are performed following a refueling or other core alteration of a PWR for which nuclear design calculations are required. This standard does not address the physics test program for the initial core of a commercial PWR.2)

This standard specifies the minimum acceptable startup reactor physics test program to determine if the operating characteristics of the core are consistent with the design predictions, which provides assurance that the core can be operated as designed. This standard does not address surveillance of reactor physics parameters during operation or other required tests such as mechanical tests of system components ~for example, the rod drop time test!, visual verification requirements for fuel assembly loading, or the calibration of instrumentation or control systems ~even though these tests are an integral part of an overall program to ensure that the core behaves as designed.

This standard assumes that the same previously accepted analytical methods are used for both the design of the reactor core and the startup test predictions. It also assumes that the expected operation of the core will fall within the historical database established for the plant and0or sister plants.

When major changes are made in the core design, the test program should be reviewed to determine if more extensive testing is needed. Typical changes that might fall into this category include the initial use of novel fuel cycle designs, significant changes in fuel enrichments, fuel assembly design changes, burnable absorber design changes, and cores resulting from unplanned short cycles. Changes such as these may lead to operation in regions outside of the plant's experience database and therefore may necessitate expanding the test program.

2) The good practices discussed in this standard should be considered for use in the physics test program for the initial core of a commercial PWR. One test that provides useful information ~without additional test time! is the hot-zero-power to hot-full-power reactivity measurement.

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