On August 21, 2007, Dresden Station experienced a grass intrusion event which impacted the operation of several systems which take a suction from the
Kankakee River. The following day, the inspectors reviewed the Quad Cities Technical Specifications and procedures to determine how operations personnel would respond to a similar intrusion event. The inspectors identified the following concerns:
Technical Specification 3.7.3 required the
ultimate heat sink to be
operable in Modes 1, 2, and 3. To maintain operability, operations personnel recorded the water level at the intake bay and the
ultimate heat sink temperature every
24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. The inspectors determined that the licensees current Technical Specification Surveillance Requirement for water level may be non-conservative under a postulated intrusion event because the water level at the suction of the safety-related cooling water pumps could be significantly lower than the water level at the intake bay. This would result in the safety-related cooling water pumps and the
ultimate heat sink being
inoperable. The licensees approved Emergency Action Levels were also based on water level at the intake bay. The inspectors determined that the approved Emergency Action Levels were adequate to address
ultimate heat sink inoperability due to a lock and dam failure. However, they did not appear to address
ultimate heat sink inoperability due to a biological or ice intrusion event. No procedural guidance existed regarding the measuring of water level at the intake of the safety-related pumps. The licensee initiated Issue Report 663343 to document the inspectors concerns. Issue Report 665703 was also initiated to document specific concerns regarding the Emergency Action Levels. At the conclusion of the inspection period, the licensee was continuing to evaluate the inspectors concerns. The inspectors considered this item to be unresolved pending a review of the licensees resolution to the above issues (
URI 05000254/2007004-02;
05000265/2007004-02)