26. The fact that a nuclear test was conducted using reactor grade plutonium and that itsuccessfully produced a nuclear yield. (77-4) (See also V.B.3.eee.)
Note: Information on date, event, name, yield, etc. remain classified.
DOE announced on June 27, 1994 that the event occurred in 1962.27. Historical plutonium production information and associated rare gas releases for thedecommissioned production reactors at the Hanford site for the period 1944 through 1960. (89-4) (See also IV.I.17.)28. Fact of use of alpha phase plutonium in unspecified weapons and test devices. (92-3)29. That plutonium-239 or weapon-grade plutonium is used:
30. Special nuclear materials masses: That about 6 kg plutonium is enough hypotheticallyto make one nuclear explosive device. (93-2) (See also V.C.2.ii.)
- a. In unspecified implosion assembled weapons or pits of unspecified staged weapons. (93-2) (See also V.C.2.gg.(1))
- b. As the sole fissile material in unspecified implosion assembled weapons, or in the pit ofunspecified staged weapons. (93-2) (See also V.C.2.gg.(2))
31. The total quantities of plutonium produced or processed at Richland. (93-3)32. The total quantity of weapons grade plutonium including supergrade plutoniumproduced at the Savannah River Plant. (93-5) (See also IV.J.19.a.)33. The Savannah River approximate total post-August 1988 plutonium inventory. (93-6)34. The United States total production of weapon-grade plutonium. (93-7)35. The total plutonium inventory at the Rocky Flats Plant. (93-8)36. The total plutonium inventory at the Argonne National Laboratory-West. (93-8)37. The total plutonium inventory at the Los Alamos National Laboratory and theLawrence Livermore National Laboratory. (93-8)38. The quantity of plutonium involved in the fire in Room 180 in Building 771 onSeptember 11, 1957, and the quantity of plutonium involved in the fire in Buildings 776 and 777 on May 11, 1969, as represented by inventory data, the amount recovered, the amounts allocated to other disposition categories such as normal operating loss, and the amount considered inventory difference as long as weapon design, manufacturing, material composition or properties, or other classified information that is protected by classified inventory data is not revealed. (94-5)39. The historical (1952 - 1993) annual inventory difference for plutonium and highlyenriched uranium at Rocky Flats. (94-7) (See also II.G.29.)40. The historical quantity of plutonium produced for any time period in the SavannahRiver reactors and information that only reveals Pu production. (94-9) (See also IV.I.19.b.)41. The quantity of plutonium separated, or otherwise modified, to other forms (such asoxide or metal) at the Savannah River Plant during any time period. (94-9) (See also IV.I.19.c)42. Plutonium quantities at the Savannah River Plant for any time period, providedother classified information such as weapons design are not revealed. (94-9)43. The total quantity of plutonium involved in all nuclear weapons tests performed by theUnited States. (94-11)**44. As part of the 1958 United States - United Kingdom Mutual DefenseAgreement, there have been three barter agreements. The United States received plutonium totaling 5,366 kilograms from the United Kingdom under the Barter A, B, and C Agreements during the period 1960 - 1979. The United States gave the United Kingdom6.7 kilograms of tritium and 7,500 kilograms of highly enriched uranium for the plutonium. (94-15) (See also II.B.15. and II.G.36)**45. The fact that plutonium combined with any stated weight percentgallium exists: (1) stabilized as an alloy in the delta phase in nuclear weapons, providing neither weapon or alloy nickname (other than Headwind) is specified, and (2) as an oxide in the weapons program, providing the source of the plutonium is not specified by weapon or alloy nickname (other than Headwind). (95-1)**46. The sum of the quantity of plutonium at the Pantex site and in the nuclearweapons stockpile was 66.1 metric tons on September 30, 1993. (95-6)
- a. Hypothetically, a mass of 4 kilograms of plutonium or uranium-233 is sufficient for onenuclear explosive device. (94-1) (See also V.C.2.jj.)
- NOTE: The average masses of special nuclear materials in the U.S. nuclear weapons orspecial nuclear materials masses in any specific weapon type remain classified.