ML091940276

NRC Opening Remarks Discuss the Draft Us Nuclear Regulatory Commission Request for Additional Information for Generic Letter GL-2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressur

ML091940276
Person / Time
Site:	Comanche Peak
Issue date:	07/09/2009
From:	Michael Scott Office of Nuclear Reactor Regulation
To:
References
GSI 191
Download: ML091940276 (5)

Text

2p, U.S.NRC UNITED STATES NUCLEAR REGULATORY COMMISSION ProtectingPeople and the Environment Introduction for Public Meeting with Comanche Peak on Generic Safety Issue 191 Michael Scott Office of Nuclear Reactor Regulation July 9, 2009 1

SU.S.NRC UNITED STATES NUCLEAR REGULATORY COMMISSION ProtectingPeople and the Environment Purpose of Meeting P r o e o e t n Discuss in detail licensee's planned path forward on each RAI for which, based on agenda-setting phone call, NRC staff is not yet confident licensee is on success path

• Attempt to reach understanding such that:

- NRC staff is confident licensee's overall approach will succeed in showing adequate ECCS strainer performance

- Licensee can have confidence that its path forward, if carried out consistent with what it has told the staff, will not result in another round of RAIs 2

S U.S.N C UNITED STATES NUCLEAR REGULATORY COMMISSION ProtectingPeople and the Environment Precepts for the discussion Emphasis for the meeting is licensee's methods in each subject area; results may be discussed as appropriate to support conclusions on method adequacy

• Licensee bears the burden of showing that its strainer will function adequately in event of a DBA

• NRC position is that. an adequate head loss test is needed to show satisfactory strainer performance unless licensee justifies that their strainer has significant nonfiltering area

• Perfection is not the standard, but staff has not been able to reach conclusions of adequacy in the face of numerous evident nonconservatisms 3

protectingPeople and the Environment(C ontinued)

No particular degree of conservatism required in any subject area; staff will not claim treatment of an area is "not sufficiently conservative" Staff will not carry concerns such as "may be nonconservative" without specific basis 4

ProteCtingPeople and the Environment Approach t Meeting For each RAI under discussion as determined during agenda-setting telecon:

- Licensee discusses path forward

- Staff asks questions/states any concerns

- Open discussion between the two parties

- Each side concludes with its position

- PM notes positions and agreements (as applicable)

• After all RAIs discussed,both parties caucus privately on any RAIs for which agreement was not reached

• Final discussion

- Either party may identify a change in its position(s)

- Staff will provide overall conclusion regarding its confidence in

.licensee's approach to issue resolution

• Public comment opportunity

• Results and agreements/disagreements documented in meeting summary 5