The Apollo Affair
A prolonged U.S. investigation into missing highly enriched uranium at NUMEC in Pennsylvania and the possibility that some of it was diverted to Israel.
Last updated August 25, 2026
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Overview
The Apollo affair, also known as the NUMEC affair, was a long-running investigation surrounding the disappearance of highly enriched uranium from the Nuclear Materials and Equipment Corporation (NUMEC), a nuclear-processing company located near Apollo and Parks Township in Pennsylvania. The case became prominent in 1965 after a major inventory discrepancy was identified at the facility. Investigators ultimately examined whether uranium had been lost through industrial contamination and accounting failures or secretly diverted to Israel's emerging nuclear program. NUMEC had begun as a nuclear consulting business and later developed capabilities for processing enriched uranium and supplying fuel for reactor applications. After receiving a contract involving enriched uranium, the company was required to maintain detailed material inventories. The resulting accounting exercises identified a substantial shortfall. Contemporary estimates varied widely, generally ranging from roughly 200 pounds to nearly 600 pounds of highly enriched uranium. Later Department of Energy records identified a 269-kilogram inventory loss before 1968 and an additional 76-kilogram loss afterward, making NUMEC's discrepancy the largest recorded highly enriched uranium inventory loss at a U.S. commercial site. Attention focused particularly on Zalman Shapiro, NUMEC's president. Shapiro was a committed Zionist and had commercial and personal connections in Israel, including work associated with nuclear-powered generators. Four Israeli intelligence personnel visited the NUMEC facility in 1968; one was Rafi Eitan, who was publicly described at the time as a defense-ministry chemist and was later identified as an Israeli intelligence officer. These connections contributed to suspicions that uranium had been transferred to Israel for use in its nuclear-weapons program. Shapiro denied wrongdoing, and no criminal charges were filed against him. The Federal Bureau of Investigation investigated Shapiro and NUMEC from 1965 until 1980. The Atomic Energy Commission, the Central Intelligence Agency, later the Nuclear Regulatory Commission, and other federal bodies also reviewed the matter. In 1976, the CIA briefed senior nuclear-regulatory officials that it believed the missing uranium had gone to Israel. The matter reached the White House during the transition to the Carter administration. A staff assessment reportedly considered the CIA's case persuasive but not conclusive. The central question has never been definitively resolved. Some investigators and commentators have regarded the Israeli-diversion theory as credible, while others have argued that the material was dispersed through ordinary industrial mechanisms. A later NRC investigation into another 198-pound discrepancy from 1974 to 1976, after Babcock & Wilcox had acquired the plant and Shapiro was no longer involved, found that more than 110 pounds could be attributed to previously undocumented loss mechanisms. These included contaminated clothing, scrubber-system losses, residues in equipment, and uranium embedded in floors and other structures. In 2009, the NRC declined a request to formally clear Shapiro, explaining that it had found no specific evidence proving diversion but also lacked sufficient information to conclude that diversion had not occurred. Declassified records released in 2010 and 2014 exposed shortcomings in the government's handling of the investigations, including concerns by former Attorney General Edward Levi that officials might have failed to report a felony. The physical legacy of the affair also continued through cleanup of contaminated waste-disposal areas near the former NUMEC site. The case remains an unresolved episode at the intersection of nuclear-material controls, U.S.-Israeli relations, intelligence investigations, and environmental remediation.
History
The Apollo affair developed from the operations of the Nuclear Materials and Equipment Corporation, or NUMEC, in the Pittsburgh region of Pennsylvania. NUMEC initially provided consulting services to nuclear-sector companies and later became capable of processing enriched uranium for reactor fuel. Once the company received a contract involving enriched uranium, federal requirements obliged it to account for its nuclear-material holdings. The resulting inventory work exposed a large discrepancy. The shortfall became public in 1965 and prompted an investigation by the FBI and the Atomic Energy Commission. NUMEC searched the plant and nearby disposal areas for recoverable material and ultimately paid the AEC $834,000 for uranium judged to be missing. Estimates of the amount varied considerably. Some accounts concentrated on approximately 206 pounds, while other calculations suggested that as much as 269 kilograms, or nearly 600 pounds, had been lost before 1968. The discrepancy was unusually large by the standards of U.S. commercial nuclear facilities. The investigation acquired an international and intelligence dimension because NUMEC president Zalman Shapiro had strong Zionist commitments, business contacts in Israel, and work connected with proposed nuclear-powered generators there. In September 1968, four Israeli personnel visited the facility. The later identification of Rafi Eitan as an Israeli intelligence officer intensified speculation that the visit had been related to the acquisition of nuclear material. Supporters of the diversion theory argued that the missing uranium could have contributed to Israel's nuclear-weapons capability. Critics responded that the evidence was circumstantial and that the industrial process itself could account for substantial losses. The FBI investigated Shapiro for approximately fifteen years, ending in 1980 without criminal charges. The AEC, CIA, and other government organizations conducted parallel inquiries. In 1976, the CIA told senior NRC officials that it believed the uranium had gone to Israel. The issue was then communicated to the White House, and advisers to President-elect Jimmy Carter concluded that the CIA's case was compelling in some respects but not definitive. A General Accounting Office review later criticized the absence of a coordinated approach among the agencies involved. A separate discrepancy arose after Babcock & Wilcox acquired NUMEC and Shapiro was no longer associated with the operation. Between 1974 and 1976, another approximately 198 pounds of uranium was considered missing. The NRC investigation determined that more than 110 pounds could be explained by loss mechanisms that had not previously been documented. Material had apparently been distributed through worker clothing, scrubber systems, equipment residues, building surfaces, and contaminated flooring. These findings provided support for the view that at least some discrepancies reflected poor accounting and process contamination rather than a deliberate transfer. Journalist Seymour Hersh later argued that Shapiro had not diverted uranium and that much of the material had entered the local environment or remained within the plant. Other analysts continued to regard the Israeli explanation as plausible. In 2009, the NRC refused to issue a definitive exoneration, stating that it had found no document specifically proving diversion but could not establish that diversion had not occurred. Declassified records in 2010 and 2014 shed light on investigative failures and possible official violations of reporting obligations. The affair also left an environmental legacy. Waste-disposal areas associated with the former NUMEC site required federal cleanup, and remediation schedules were repeatedly postponed after additional contamination was found. The Apollo affair therefore encompasses not only a disputed nuclear-proliferation allegation but also a history of regulatory weakness, intelligence uncertainty, industrial material-control problems, and long-term site remediation.
- 2025
Remediation remains pending
[1]Federal cleanup planning continued after contamination at the former NUMEC waste-disposal site proved more extensive than originally anticipated.
- 2014
Further investigation records are released
[1]Additional declassified documents disclosed concerns that federal officials may have failed to report a felony and may have committed related violations.
- 2010
Government Accountability Office review is declassified
[1]A declassified review criticized the lack of coordinated action among the agencies investigating the missing uranium.
- 2009
NRC rejects definitive exoneration request
[1]The NRC declined to conclusively clear Shapiro while acknowledging that it had found no specific evidence proving diversion.
- 1980
Long-running FBI investigation ends without charges
[1]The FBI investigation of Shapiro and NUMEC concluded after roughly fifteen years, with no criminal charges filed.
- 1976
CIA briefs nuclear regulators
[1]The CIA informed senior NRC personnel that it believed the missing uranium had been diverted to Israel.
- 1968
Large pre-1968 inventory loss recorded
[1]Later Department of Energy records identified a 269-kilogram inventory loss at NUMEC before 1968, the largest such loss recorded at a U.S. commercial site.
- 1965
FBI investigation begins
[1]The FBI began investigating NUMEC president Zalman Shapiro after a major quantity of highly enriched uranium could not be reconciled in company inventories.
Products and positioning
Not a commercial brand; the term identifies a historical nuclear-material investigation and controversy.
Controversies
2014
Questions about federal investigative conduct
Declassified records revealed that Edward Levi believed officials might have failed to report a felony and could have violated federal law in their handling of the matter.
1976
CIA allegation of diversion to Israel
The CIA told nuclear regulators that it believed missing uranium from NUMEC had reached Israel, but the allegation was never established in court and no charges followed.
1965
Missing highly enriched uranium at NUMEC
A major discrepancy in NUMEC's highly enriched uranium inventory led to investigations into whether material had been lost through industrial processes or deliberately diverted to Israel.
Brand decisions
2009
NRC refuses to issue definitive clearanceOtherBackground
Senator Arlen Specter asked the NRC to clear Zalman Shapiro of suspicion concerning the possible diversion of nuclear material.
Action taken
The NRC stated that it had found no specific evidence proving diversion but could not conclude that diversion had not occurred.
Aftermath
The case remained unresolved, with neither a substantiated criminal finding nor a definitive exoneration.
1965
NUMEC pays the Atomic Energy Commission for missing uraniumOtherBackground
After searches of the plant and associated disposal areas failed to reconcile the inventory, NUMEC was held financially responsible for the missing material.
Action taken
The company paid $834,000 to the Atomic Energy Commission.
Aftermath
The payment did not resolve whether the uranium had been accidentally lost, dispersed through industrial processes, or diverted.
Payment for missing uranium. $834,000 paid (1965-era investigation)
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