Page 360 - Beyond Decommissioning

336 Beyond Decommissioning

– removal of damaged sections of piping; and
– grouting in situ of all cleaned drains to avoid unnecessary excavations.
Lessons learned: To maintain control of configuration and to decommission unused
piping during operations is beneficial to the redevelopment of the site.
Record keeping is essential to support the end state definition.
Drains may be fit for reuse (on this site the rainwater drainage) or will have to be
decommissioned. If grouting in situ is justified, no excavation and removal of piping
will be required.

7.14.9 Information needed for property transfer, Hanford Site,
United States (International Atomic Energy Agency, 2011)

Problem encountered: During the turnover of property in the 3000 Area of the US
DOE Hanford Site, some problems were encountered during the transfer/redevelop-
ment activities.
Reportedly more complete and clearer information intended to facilitate the prop-
erty transfer and redevelopment plans had to be provided.
2
Analysis: The 290,000m area with about 15 buildings was transferred to the local
property authority for redevelopment. Then, the redeveloper became responsible for
site redevelopment. A more efficient turnover should have been implemented.
Lessons learned: The following critical actions should be taken in planning for
property transfer to the developer:
– A transition period should be granted to the new owners when the current ones are still avail-
able to be consulted on how to resolve any misunderstanding over actual conditions onsite.
– A dedicated effort should be given to transferring detailed records on utility locations, espe-
cially those underground. If these issues are not solved beforehand, it will be more expen-
sive to locate and fix those utilities that, due to poor recordkeeping, are damaged in
subsequent site redevelopment operations.
– Any environmental issues remaining at the site before turnover should be specified in a
detailed site assessment.
– To ease the redevelopment, the turnover should also include transfer of information on the
site telecommunication system and on utilities billing costs.

7.14.10 Abandoned energized 120-V electrical line found during
backfill operations, Los Alamos National Laboratory
(U.S. Department of Energy, 2017)
Problem encountered: On October 23, 2017, at Technical Area 53, across from Build-
ing 1145, a worker, who was spotting backhoe excavation work, noticed a cut nonme-
tallic cable in the excavated trench. The worker alerted the supervisor at once. The
supervisor called a halt to the works and the area was fenced off. As per work permit,
electricians found out 120-V alternating current on the line side of the cut cable.
A review of the distribution panel feeding the circuit did not find a tripped breaker.
The operations maintenance coordinator then had the electricians identify the tripped