ML062700644: Difference between revisions
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| number = ML062700644 | | number = ML062700644 | ||
| issue date = 10/20/2006 | | issue date = 10/20/2006 | ||
| title = 09/21/2006 Summary of Meeting with Omaha Public Power District (OPPD) to Discuss OPPD Participation in the Water Management Strategies Program | | title = 09/21/2006 Summary of Meeting with Omaha Public Power District (OPPD) to Discuss OPPD Participation in the Water Management Strategies Program | ||
| author name = Wang A B | | author name = Wang A B | ||
| author affiliation = NRC/NRR/ADRO/DORL/LPLIV | | author affiliation = NRC/NRR/ADRO/DORL/LPLIV |
Revision as of 18:08, 10 February 2019
ML062700644 | |
Person / Time | |
---|---|
Site: | Fort Calhoun ![]() |
Issue date: | 10/20/2006 |
From: | Wang A B NRC/NRR/ADRO/DORL/LPLIV |
To: | |
Wang A B, NRR/DORL/LP4, 415-1445 | |
References | |
TAC MC5780 | |
Download: ML062700644 (5) | |
Text
October 20, 2006LICENSEE:Omaha Public Power DistrictFACILITY:Fort Calhoun Station, Unit No. 1
SUBJECT:
SUMMARY
OF SEPTEMBER 21, 2006, MEETING WITH OMAHA PUBLIC POWER DISTRICT (OPPD) (TAC NO. MC5780)
On September 21, 2006, the U.S. Nuclear Regulatory Commission (NRC) staff conducted a meeting with OPPD to discuss its participati on in the Water Management Strategies program.
OPPD had recently requested, and the NRC staff had approved, an extension to the completion
date of the Generic Safety Issue (GSI)-191 efforts. OPPD stated it will complete the actions
stated in its request for the fall 2006 refueling outage. However, as the result of some of the
chemical effects testing, OPPD is concerned as to whether it will be able to complete the
analysis to finalize the final resolution of GSI-191 by the extension date. OPPD is looking at
different water management strategies that would allow them to meet its commitment for
completion of the GSI-191 effort by April 2008.
OPPD is evaluating two possible water management strategies to limit the load on the strainers:
(1) OPPD would change the start logic on the containment spray pumps (CSPs) to start on high
containment pressure and low steam generator pressure and (2) OPPD would terminate CSPs
at the start of recirculation. In both cases, OPPD proposes to provide core cooling using the
high-presure safety injection pump(s) for recircul ation. OPPD provided some preliminary results of the transport analysis assuming these water management strategies. The NRC noted that
the transport fraction of low density fibers went from 100 percent to 0 percent. OPPD stated this
was a result of the transport analysis for these scenarios. The NRC staff agreed the transport
would be reduced but felt 0 percent was probably not a realistic number. OPPD agreed but
again noted this was a calculated number and that the real number is somewhere between 0
percent and 100 percent. The NRC staff noted that other transport assumptions noted in the
OPPD slides were also beyond those approved in the industry guidance report. The NRC staff
did note that such a plant-specific approach was allowed but would require specific NRC review
and approval.
OPPD provided some discussion on regulatory obstacles. In particular, OPPD discussed the possible effects on the dose consequences and the maximum containment pressure and
temperature calculations due to the stoppage of containment spray. Alion provided a closed
discussion on a proposed new method to estimate aerosol natural deposition inside the
containment as related to the dose calculations. As an alternative, OPPD noted it is pursuing
qualifying the containment recirculation system high efficiency particulate air (HEPA) filters to be
able to apply credit in the dose calculations for mitigation of the radioactivity release inside the
containment. OPPD stated that the preliminary results for not starting the CSPs during a
loss-of-coolant accident are that the containment design pressure and temperature would not
be exceeded. OPPD stated that if the containm ent recirculation system HEPA filters can be qualified, it believes the calculated doses will be within regulatory limits. The NRC staff noted
that if OPPD wants to qualify the HEPA filters in an expeditious manner, it should not deviate
from the American Society for Testing and Materials requirements. OPPD stated that its goal is to complete the GSI-191 effort by April 2008. However, if it pursues one of the above strategies, OPPD would like to know if the NRC would consider an extension
should the ramifications of the water management review result in a need to go beyond April
2008. OPPD notes that the water management strategies would possibly provide them the
margin that would allow the use of a smaller strainer than the currently proposed strainer of
3,000 square feet. OPPD stated that it would like to pursue this option and has not started the
scheduling pending the result of this meeting. OPPD noted that it understands that because of
some of its unique design features, its water management strategies may not apply broadly to
the industry. The NRC staff agreed but felt several of the OPPD issues are applicable to other
plants seeking to do water management strategies. The NRC staff noted that while OPPD's
approach appears to be reasonable, OPPD is proposing something quite complex and different
from the rest of the industry. As such, the NRC staff will need to discuss it further internally.
The NRC staff stated it would keep OPPD informed of its discussions.
A list of attendees is enclosed. The OPPD and Alion non-proprietary presentation slides are available in the Agencywide Document s Access and Management System (ADAMS) under accession numbers ML062680528 and ML062700272, respectively.
The NRC staff thanked OPPD for the presentation.
Please direct any inquiries to me at 301-415-1445, or abw@nrc.gov
./RA/Alan B. Wang, Project Manager Plant Licensing Branch IV
Division of Operating Reactor Licensing
Office of Nuclear Reactor Regulation Docket No. 50-285
Enclosure:
List of Meeting Attendees
cc w/encl: See next page OPPD stated that its goal is to complete the GSI-191 effort by April 2008. However, if it pursues one of the above strategies, OPPD would like to know if the NRC would consider an extension
should the ramifications of the water management review result in a need to go beyond April
2008. OPPD notes that the water management strategies would possibly provide them the
margin that would allow the use of a smaller strainer than the currently proposed strainer of
3,000 square feet. OPPD stated that it would like to pursue this option and has not started the
scheduling pending the result of this meeting. OPPD noted that it understands that because of
some of its unique design features, its water management strategies may not apply broadly to
the industry. The NRC staff agreed but felt several of the OPPD issues are applicable to other
plants seeking to do water management strategies. The NRC staff noted that while OPPD's
approach appears to be reasonable, OPPD is proposing something quite complex and different
from the rest of the industry. As such, the NRC staff will need to discuss it further internally.
The NRC staff stated it would keep OPPD informed of its discussions.
A list of attendees is enclosed. The OPPD and Alion non-proprietary presentation slides are available in the Agencywide Document s Access and Management System (ADAMS) under accession numbers ML062680528 and ML062700272, respectively.
The NRC staff thanked OPPD for the presentation.
Please direct any inquiries to me at 301-415-1445, or abw@nrc.gov
./RA/Alan B. Wang, Project Manager Plant Licensing Branch IV
Division of Operating Reactor Licensing
Office of Nuclear Reactor Regulation Docket No. 50-285
Enclosure:
List of Meeting Attendees cc w/encl: See next pageDISTRIBUTION
- PUBLICMHart, DRA LPLIV ReadingRArchitzel, DSS RidsNrrDorl (CHaney/CHolden)HWagage, DSS RidsNrrDorlLpl4 (DTerao)RJasinski, NRR RidsNrrPMAWangRidsNrrDssSsib RidsNrrLALFeizollahiRDennig, DSS RidsOgcRpTMartin, DSS RidsAcrsAcnwMailCenterRidsNrrDraAadb RidsRegion4MailCenterRidsNrrDorlDpr ACCESSION NO.: ML062700644OFFICENRR/LPL4/PMNRR/LPL4/LANRR/LPL4/BCNAMEAWangLFeizollahiDTerao DATE10/20/0610/20/0610/20/06 OFFICIAL RECORD COPY MEETING WITH OMAHA PUBLIC POWER DISTRICT (OPPD)
LIST OF ATTENDEES SEPTEMBER 21, 2006 NRC OPPD ALION OthersT. MartinJ. GasperJ. BostlemanD. VincentA. WangS. BaughnT. HeamesG. Salamon R. DennigT. Kendall R. ArchitzelF. Verbos M. KotzalasJ. Butler
M. Hart H. Wagage April 2006 Ft. Calhoun Station, Unit 1 cc: Winston & Strawn ATTN: James R. Curtiss, Esq.
1700 K Street, N.W.
Washington, DC 20006-3817 Chairman Washington County Board of Supervisors
P.O. Box 466
Blair, NE 68008 Mr. John Hanna, Resident Inspector U.S. Nuclear Regulatory Commission
P.O. Box 310
Fort Calhoun, NE 68023 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission
611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-4005 Ms. Julia Schmitt, Manager Radiation Control Program
Nebraska Health & Human Services R & L
Public Health Assurance
301 Centennial Mall, South
P.O. Box 95007
Lincoln, NE 68509-5007 Mr. David J. Bannister, Manager Fort Calhoun Station
Omaha Public Power District
Fort Calhoun Station FC-1-1 Plant
P.O. Box 550
Fort Calhoun, NE 68023-0550 Mr. Joe L. McManis Manager - Nuclear Licensing
Omaha Public Power District
Fort Calhoun Station FC-2-4 Adm.
P.O. Box 550
Fort Calhoun, NE 68023-0550 Mr. Daniel K. McGhee Bureau of Radiological Health
Iowa Department of Public Health
Lucas State Office Building, 5th Floor
321 East 12th Street
Des Moines, IA 50319 Mr. R. T. Ridenoure Vice President - Chief Nuclear Officer
Omaha Public Power District
Fort Calhoun Station FC-2-4 Adm.
Post Office Box 550
Fort Calhoun, Nebraska 68023-0550