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Historical Background

Prior to 1981, the number of bolting-related incidents reported by licensees was on the increase.

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Pressurized water reactors are susceptible to certain types of hypothetical accidents that, under circumstances such as operation of the reactor beyond a critical time in its life, could result in failure of the p

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This issue was identified during plant design and emergency procedure reviews which raised questions as to whether certain safety actions have to be accomplished automatically or whether manual operator action is

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In a San Onofre Unit 1 Preliminary Notification issued in September 1980, it was reported that, during testing, the licensee had identified a problem with the design of the diesel generator sequencing circuitry.

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This issue concerns the slow loss of control air pressure in the scram system of BWRs.[1]Air pressure dropping at a certain rate will first allow some of

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Historical Background

This issue was raised by the staff following a review[1]^,[2]

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Background

This issue addressed the high rate of reactor coolant pump (RCP) seal failures that challenge the makeup

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Historical Background

Many PWRs have no positive means of detecting boron dilution during cold shutdown.[1]Some op

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This issue originated from NUREG-0572[1]where the ACRS identified vibration-induced equipment failures

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Historical Background

This concern was raised[1]because of the potential for a high-altitude nuclear weapon detonation causing a large electromag