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On April 6, 2004, at 1400 CDT, Clinton Power Station discovered an air valve open for the Standby Liquid Control tank sparger. The open air sparger valve caused both Standby Liquid Control pumps to be inoperable due to the potential of air binding the pumps. The valve was closed, and the Standby Liquid Control is now operable. A Prompt Investigation is being commenced to determine circumstances of this open air sparger. The condition existed for approximately five weeks." The system was restored at approximately 1500 on 4/6/04. The Licensee notified the NRC Resident Inspector.

• * * UPDATE 1840 EDT ON 6/3/04 FROM ED TIEDEMANN TO S. SANDIN * * *

This report is retracted based on the following: During further investigation, a calculation was performed to detail the air entrainment into the SLC pumps and the results show that air entrainment from the air sparger would not reduce system flow below that required by Technical Specifications. Therefore, it was determined that the system design is such that whenever the air sparge valve to the Standby Liquid Control (SLC) tank is open, the pumps remain operable and capable of performing their safety function. Thus, this occurrence (EN #40652 dated 4/6/04) was not reportable under 10CFR50.72(B)(3)(V)(A) and 10CFR50.72(B)(3)(V)(D). The Licensee notified the NRC Resident Inspector. Notified R3DO (Lanksbury).