[DOE LETTERHEAD]

June 2, 2008

The Honorable A. J. Eggenberger

Chairman

Defense Nuclear Facilities Safety Board

625 Indiana Ave., N. W., Suite 700

Washington, D.C. 20004-2901

Dear Mr. Chairman:

On December 29, 2005, the Department of Energy (DOE) transmitted Exclusion Reports for National Nuclear Security Administration (NNSA) and Office of Environmental Management (EM) facilities in accordance with Commitment 8.3 of the Implementation Plan (IP) for Defense Nuclear Facilities Safety Board (DNFSB) Recommendation 2004-2, Active Confinement Systems. Commitment 8.3 required a list of, and justification for, defense nuclear facilities that will be excluded from further review of confinement systems under the IP. The Exclusion Reports were developed in accordance with the guidance and criteria contained in the deliverable for Commitment 8.2, Exclusion Reporting Process, which was submitted to the DNFSB on October 31, 2005. The Exclusion Reports for NNSA facilities were prepared at the sites and were reviewed and approved by NNSA line management and the Central Technical Authority (CTA).

On August 7, 2006, NNSA provided to the DNFSB a list of 26 facilities that will complete a Safety-Related Ventilation System Evaluation as deliverable 8.6.1 of the IP. The NNSA has subsequently identified one additional facility (the Waste Solidification Building at the Savannah River Site) for which a ventilation system evaluation will be performed and has identified six facilities on the list of 26 previously provided for which Exclusion Reports are now considered appropriate. Accordingly, NNSA has prepared the enclosed additional Exclusion Reports to be included with those provided in response to Commitment 8.3. These reports were also developed in accordance with the approved 2004-2 exclusion reporting process and have been signed by the respective NNSA Site Office, CTA, and the Program Secretarial Office as required.

If you have any questions, please contact me or have your staff contact Rick Kendall at

(301) 903-3102.

Sincerely,

Robert L. Smolen

Deputy Administrator

for Defense Programs

Enclosure

cc: W. Ostendorff, NA-2

J. Talbot, NA-17

M. Whitaker, HS-1.1

B. Burns, HS- 1.1

J. O'Brien, HS-22

D. Winchell, LASO

C. Yuan-Soo Hoo, LSO

T. Sherry, YSO