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1 Are
the requirements defined and documented?
Defined and documented in
the PDR presentation
2.
Will the design meet performance requirements?
The design meets all the
requirements
3. Is
the design adequately underpinned by analysis and testing?
Yes. A representative
mockup was constructed, tested by Stefan Gerhardt and Larry Guttadora and
results are presented in the PDR.
4.
Have failure modes and effects been considered? Have appropriate provisions
for recovery been made?
Failure of the Rogowski
coil system (design flaw) would be a significant negative impact to the
program since access to the coils would be basically not possible. If all
three coils failed a new design for installation inside the vacuum vessel is
proposed.
Failure is anticipated to
be mechanical damage. The design is robust and the location forms a barrier
to impact from large assembly components and should not be harmed from small
component impacts. The coils are most susceptible after installation but
before and especially during field period assembly (6 packs). The twisted
leads are to be placed into a flexible SS hose and wrapped around the vessel
next to the Rogowski protective outer sheath before the three field periods
are welded. If mechanical failure occurred there should be time to replace
the damaged coil. Welding should not be an issue. There is reasonable access
even after the modular coils are installed for replacement to be
accomplished. If twisted leads are damaged other than at the mandrel a
repair is most likely.
An electrical failure
would require an outside agency and only through the connecting wiring or
failure of electronics components. A flexible SS protective sheath will
protect the twisted coaxial leads up to the junction box. If these modes of
failure would disable a Rogowski it would be a single failure and there are
two spares planned.
5.
Have design and implementation risks been identified and properly mitigated?
The design and installation
location has been discussed with Tom Brown and cognizant physics personnel
and the design is acceptable from the stand point of function and
implementation. The design and fabrication has been discussed with personnel
who would perform the fabrication at PPPL and who produced the prototype and
the implementation is judged to be reasonably straight forward.
The prototype was fit up to
VV2 and reviewed with personnel who will install the coil and the design was
thought to be acceptable for installation.
The
installation risk is considered low. |
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