ML090860061

Summary of Telephone Conference Call Held Between NRC and Prairie Island, Concerning Request for Additional Information Pertaining to the Prairie Island Units 1 and 2

ML090860061
Person / Time
Site:	Prairie Island
Issue date:	02/23/2009
From:	Division of License Renewal
To:
References
TAC MD8513, TAC MD8514
Download: ML090860061 (1)

Text

Summary of NRC-PINGP Conference Call on 2/23/09 NRC

Participants:

Rick Plasse, Bruce Heida PINGP

Participants:

Gene Eckholt, Scott Marty, Bob Vincent NRC requested clarification of the NSPM response to RAI 2.3.3.5-03 in a letter dated 1/15/09. The reviewer indicated that the drains from chillers would be expected to be configured to prevent control room air in-leakage, and questioned whether the drains are hard piped or open to floor drains.

PINGP responded that the air handler is in the control room envelope. The drains off the chillers are hard piped into the roof drains with no loop seals. Both the roof drains and the chiller condensate drains are in-scope for license renewal for-spatial interaction. It is recognized that this configuration provides a small leak path for air in-leakage into the control room through the roof drains.

Testing in the current configuration shows that the total control room in-leakage, including the small leakage through this path, is within the in-leakage assumed in the analysis. A modification has been proposed to reroute the chiller drains to the floor drains which have a loop seal.

Based on this clarification the reviewer indicated that he had sufficient information. No further action is needed from PINGP.