MEETING MINUTES

ANS-19.10 Fast Neutron Fluence in Reactor Cavities

Westin Diplomat Hotel

3555 South Ocean Drive, Hollywood, Florida 33019

June 9, 2002

The twenty-first meeting of ANS-19.10 was convened at 10:00 a.m. on Sunday, June 9, 2002. Eight committee members and Suriya Ahmad of the ANS were in attendance. The names, affiliations, e-mail addresses, and fax and phone numbers of the attendees are given in Attachment-I.

Chairman L. Lois welcomed the Committee members and expressed appreciation for the continued interest and contributions to the Standard. He asked that Committee members who are providing contributions to provide them on a diskette, preferably in WordPerfect format.

The Committee unanimously approved the minutes for the previous June 17, 2001, Milwaukee, WI meeting.

The Chairman provided a summary and status of the Standard and noted that, while substantial progress has been made, there are still a substantial number of modifications and updates that will be required to bring the Standard into a form consistent with the format and content of typical reactor physics standards.

The Chairman noted that ANS-19 has requested that the level of detail be reduced and the format be shortened. He distributed a new “working draft” in which the detail had been reduced substantially but further modifications are necessary. He noted that in this new draft the references had been eliminated and that these would be added when the text has been finalized. L. Lois asked the Committee members to provide meaningful comments that fit into the proposed shortened format. He stated that both extensive text as well as detailed comments on specific items would be appreciated.

S. Anderson asked is there any reason that we are limited to U.S. reactors.

J. Carew suggested that changes to the Listing of Definitions and Symbols be postponed until the text is finalized.

L. Lois stated that relevant ANS and ASTM Standards should be referenced.

J. Wagner stated that there are details in the synthesis approach that should be retained in the Standard.

S. Anderson stated that a discussion on averaging the core neutron source should be added to Section 3.1.1.

S. Anderson stated that the older cross section libraries referenced in the footnote in Section 3.1.1.3 should be eliminated.

L. Lois agreed and suggested that BUGLE-96 be retained as an example.

S. Baker stated that the wording in Section 3.1.1.2 should indicate that the important structures such as the jet pumps should be modeled.

J. Carew stated that the equations in Section 3.1.2 should be removed.

S. Anderson recommended that the ASTM benchmarking Standard E-2006 be referenced.

S. Baker stated that the wording in Section 3.1.3.1 should be changed to indicate that more than one benchmark is required.

J. Carew stated that it should be noted in Section 3.1.3.2 that the uncertainty listing is provided as an example and is not necessarily all inclusive. He also noted that this list should be expanded.

J. Wagner made the following suggestions concerning Section 3.1.3.2: (1) the statement that a cross section uncertainty is not required if a recommended library is used should be removed (2) the term “convergence” should be replaced by “solution convergence” (3) the first bullet should indicate that the model should reflect the actual physical situation (4) the statement “in two ways . . . . . . ” should be eliminated and (5) guidance should be provided on the selection of tallies and variance reduction.

J. Carew suggested that Sections 3.1 and 3.2 should be rearranged so that methods applicable to both the discrete ordinates and Monte Carlo methods are only presented once.

S. Anderson suggested that the term “measurements” be replaced by “metrology.”

L. Lois stated that the number of bullets should be reduced.

J. Carew suggested that a typical set of dosimeters be included.

M. Mahgerefteh asked if excore dosimeters can be used without calculations to monitor the vessel fluence after they are validated.

L. Lois stated that excore dosimetry alone is not sufficient to monitor the condition of the vessel.

S. Anderson stated that the material in Section-5 should be simplified further.

Chairman Lois thanked all present for their continued efforts and adjourned the meeting at approximately 12:00 noon.