WOLF CREEK: TECHNICAL SPECIFICATION REQUIRED SHUTDOWN DUE TO NON-FUNCTIONAL CLASS 1E ELECTRICAL A/C UNIT

Class 1E A/C Unit SGK05A cools safety related electrical train 'A' and was declared non-functional at 1111 hours. As a result, the following supported safety related electrical equipment was declared inoperable: 4.16 KV Bus NB01, 480 volt Buses NG01 and NG03, 120 volt Instrument AC Inverters and Buses NN11, NN13, NN01 and NN03, 125 VDC Chargers and Buses NK11, NK13, NK01 and NK03. T/S 3.0.3 was entered from T/S 3.8.7 due to two out of four 120 volt AC Inverters (NN11 and NN13) being inoperable. All electrical systems listed above remain available but are declared inoperable due to inadequate room cooling capability. Plant shutdown to mode 5 commenced at 1125 hours. No major equipment is out-of-service. All systems have functioned normally. Plant is currently at 55% power ramping down. Plant must be in mode 3 by 1811 CDT. No compensatory measures have been established.
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