1. NAME AND TITLE

INTRUDE-ANS A Repository Intrusion Risk Evaluation Code

2. CONTRIBUTORS

Associated Nuclear Services, Surrey, England through the NEA Data Bank, Gif-sur-Yvette Cedex, France.

3. CODING LANGUAGE AND COMPUTER

Fortran 77, VAX 8810.

4. NATURE OF PROBLEM SOLVED

INTRUDE was developed to facilitate calculation of the risks associated with the possibility of intrusion into a repository containing radioactive waste.

5. METHOD OF SOLUTION

INTRUDE evaluates the risk based on three routes of exposure: inhalation of active material by the intruder, external exposure of the intruder and distribution of active material around the intrusion region leading to long term exposure pathways. The time dependent activity by each nuclide is calculated by means of an analytic solution to the Bateman equation.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

On a VAX 8810, INTRUDE took 3.64 seconds.

8. COMPUTER HARDWARE REQUIREMENTS

INTRUDE runs on the VAX family of computers.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran 77 compiler is required. The operating system for the VAX is VMS.

10. REFERENCES

D. J. Nancarrow and M. C. Thorne, "User's Guide to the Repository Intrusion Risk Evaluation Code INTRUDE," ANS Report No. 595-4 (May 1986).

D. J. Nancarrow and M. C. Thorne, "Programmer's Guide to Repository Intrusion Risk Evaluation Code INTRUDE," ANS Report No. 595-5 (May 1986).

D. J. Nancarrow and M. C. Thorne, "Test Documentation to the Repository Intrusion Risk Evaluation Code INTRUDE," ANS Report No. 595-6 (May 1986).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one (360K) DOS diskette.

12. DATE OF ABSTRACT

March 1991.