ML20029E942

Hbpp 01-15-2020 Wide r3

ML20029E942
Person / Time
Issue date:	01/27/2020
From:	John Clements, Robert Evans, John Hickman, Bruce Watson Division of Decommissioning, Uranium Recovery and Waste Programs
To:
S Giebel
Shared Package
ML20029E935	List: ML20029E936 ML20029E937 ML20029E938 ML20029E940 ML20029E941 ML20029E942 ML20029E943 ML20029E944 ML20029E945
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Download: ML20029E942 (10)

Text

Humboldt Bay Power Plant Unit 3 Lessons Learned Decommissioning Surveys and Experiences John Clements, CHP Robert Evans, CHP, John Hickman, Bruce Watson, CHP U.S. Nuclear Regulatory Commission

Humboldt Bay Power Plant Unit 3 2

Site History 3

• Single Nuclear Unit along with the Humboldt Bay Generating Station (HBGS)

• 1976 - HBPP, Unit 3, was shut down for refueling (upgraded seismic design basis)

• 1980 - decided uneconomical to restart the unit

Site History 4

• 1984 - submitted a license amendment request (LAR) to possess fuel for up to 30 years, and to decommission using SAFSTOR

• 1998 - Post-Shutdown Decommissioning Activities Report (PSDAR) submitted to the NRC

• 2008 - all spent fuel had been removed from the spent fuel pool and transferred to the 10 CFR 72 licensed ISFSI

• 2013 - License Termination Plan (Rev. 0) submitted to the NRC

Unique Radionuclides of Concern 5

• 1963 - 1969, Stainless steel-clad fuel experienced gross cladding failures

- Alpha contamination (transuranics) in numerous plant systems

• 1969, transition to zircaloy assemblies Over SAFSTOR period beta and gamma emitting radionuclides decayed,

- Alpha became a more dominant factor to dose

• The primary contaminants of concern are Fe-55, Co-60, Cs-134, Cs-137, Ni-63, Pu-238/241, and Am-241

Small Footprint 6

• Confined Spaces

• Dismantlement Challenges Side of vessel Under-reactor access

Unique Survey Situations 7

Partial site release of flooded areas Caisson removal, slurry wall

Conclusions 8

• Radionuclides of Concern

- Challenges can arise from failed fuel and decay of beta/gamma radionuclides

- Health Physics programs need to be adjusted accordingly

• Small Footprints

- Specialized training/planning for confined spaces Unique Survey Situations

- Traditional decommissioning approaches may not apply

- Additional strategies/conservatisms may be prudent

- Open communication with regulators

Conclusions 9

Speaker Contact Information 10 John Clements, CHP john.clements@nrc.gov 301-415-5878