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On March 12, 2001 with the reactor at cold … On March 12, 2001 with the reactor at cold shutdown, plant personnel identified an unanalyzed condition related to structural adequacy of two High Energy Line Break (HELB) barrier walls located on the 931ft elevation of the Turbine Building. The HELB barriers separate two redundant divisions of essential 480V Motor Control Centers (MCC), and are required to withstand differential pressure forces due to a postulated HELB. A postulated HELB of a feedwater pump discharge line or a main steam line in the Turbine Building and a consequent failure of these walls could damage both divisions of 480V MCCs.</br></br>Modifications were installed to ensure that the affected HELB barriers would withstand the postulated HELB pressure forces.stand the postulated HELB pressure forces. +
March 12, 2001 +
On March 12, 2001 with the reactor at cold … On March 12, 2001 with the reactor at cold shutdown, plant personnel identified an unanalyzed condition related to structural adequacy of two High Energy Line Break (HELB) barrier walls located on the 931ft elevation of the Turbine Building. The HELB barriers separate two redundant divisions of essential 480V Motor Control Centers (MCC), and are required to withstand differential pressure forces due to a postulated HELB. A postulated HELB of a feedwater pump discharge line or a main steam line in the Turbine Building and a consequent failure of these walls could damage both divisions of 480V MCCs.</br></br>Modifications were installed to ensure that the affected HELB barriers would withstand the postulated HELB pressure forces.stand the postulated HELB pressure forces. +
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8 +
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15:11:02, 27 November 2017 +
May 11, 2001 +
March 12, 2001 +
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