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Ensuring a Nuclear Power Plant Safe State Following an EMP Event - Task 7 Deliverable: EMP Testing of Secondary Coupling to Instrumentation Cables

Bowman, Tyler B.; Guttromson, Ross G.; Martin, Luis S.

Sandia National Laboratories performed tests to address the potential vulnerability concerns of a coupled High-Altitude Electromagnetic Pulse (HEMP) inducing secondary coupling onto critical instrumentation and control cables in a nuclear power plant, with specific focus on early-time HEMP. Three types of receiving cables in nine configurations were tested to determine transfer functions between two electrically separated cables referenced to the common mode input current on the transmitting cable. One type of transfer function related the input short circuit current and resulting open circuit voltage on the receiving cable. The other transfer function related the input short circuit current and the resulting short circuit current on the receiving cable. A 500 A standard HEMP waveform was input into the transfer functions to calculate peak coupling values on the receiving cables. The highest level of coupling using the standard waveform occurred when cables were in direct contact, with a peak short circuit current of 85 A and open circuit voltage of 9.8 kV, while configurations with separated cables predicted coupling levels of less than 5 A or 500 V.

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TYPE SAND Report YEAR 2022
DOIOSTI

Analysis of limited coverage effects on areal density measurements in inertial confinement fusion implosions

Physics of Plasmas

Gopalaswamy, V.; Betti, R.; Bahukutumbi, Radha; Crilly, A.J.; Woo, K.M.; Lees, A.; Thomas, C.; Igumenshchev, I.V.; Miller, S.C.; Knauer, J.P.; Stoeckl, C.; Forrest, C.J.; Mannion, Owen M.; Mohamed, Z.L.; Rinderknecht, H.G.; Heuer, P.V.

Accurate diagnosis of areal density (ρR) is critical for the inference of performance metrics in inertial confinement fusion implosions. One potential source of error in this diagnosis is the existence of low mode perturbations in the imploding target, which lead to asymmetries in the inference of the ρR from different lines of sight. Here, the error accrued as a result of limited coverage of the sphere due to a finite number of detectors is quantified, and the development of a forward scatter measurement from the OMEGA neutron time-of-flight detectors is motivated. A method by which the 1D-equivalent 4π-averaged ⟨ ρ R ⟩ can be reconstructed, if accurate mode information can be diagnosed by other means, is validated.

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TYPE Journal Article YEAR 2022
DOIOSTIScopus
Results 4601–4625 of 96,771
Results 4601–4625 of 96,771