ML102230295

E-mail Attachment: RAI - Point Beach Nuclear Plant, Units 1 and 2 Alternate Source Term (AST) License Amendment Request (LAR)

ML102230295
Person / Time
Site:	Point Beach
Issue date:	07/27/2010
From:	Plant Licensing Branch III
To:	Point Beach
beltz T, NRR/DORL/LPL3-1, 301-415-3049
References
TAC ME0219, TAC ME0220
Download: ML102230295 (1)

Text

REQUESTS FOR ADDITIONAL INFORMATION Point Beach Nuclear Plant, Units 1 and 2 Alternate Source Term (AST) License Amendment Request (LAR)

(TAC Nos. ME0219 and ME0220)

The following requests for additional information (RAI) are associated with the NRC staff review in the Electrical Engineering Branch (EEEB) associated with Supplement to LAR 241, AST, Revised Proposed Technical Specifications for Control Room Envelope Habitability Program dated July 8, 2010 (ADAMS Accession No. ML101890783).

RAI-1 (EEEB)

In its July 8, 2010, RAI response to staff Question 2, the licensee stated the following:

The mitigating filtration unit(s) will only be placed in service when the CREFS is out of service. The electrical power requirements for the mitigating filtration unit(s) are equivalent to the installed CREFS fans. Thus, EDG loading would not be affected if the mitigating filtration unit(s) were placed into service following a loss of offsite power.

a) Describe how the mitigating filtration unit(s) will be electrically connected and loaded onto the diesel generator (i.e., sequence of loading). Also describe what prevents the CREFS and mitigating filtration unit(s) from concurrently being loaded onto the diesel generator (alternatively: discuss how the diesel generator has sufficient capacity to support loading of both the CREFS and mitigating filtration unit(s)).

b) Describe how the mitigating filtration unit(s) will be electrically isolated and separated from the Class 1E system.

c) Describe how you determined that the electrical power requirements for the mitigating filtration unit(s) are equivalent to the installed CREFS fans (e.g., provide the ratings for the CREFS and mitigating filtration unit(s)).