ML102380230

Summary of Meeting with Omaha Public Power District Regarding a Preliminary Substantial Finding

ML102380230
Person / Time
Site:	Fort Calhoun
Issue date:	08/26/2010
From:	Thomas Farnholtz Region 4 Engineering Branch 1
To:	Bannister D Omaha Public Power District
References
FOIA/PA-2014-0210
Download: ML102380230 (24)

Text

UNITED STATES NUC LE AR RE G ULATO RY C O M M I S S I O N R E GI ON I V 612 EAST LAMAR BLVD , SU I TE 400 AR LI N GTON , TEXAS 76011-4125 August 26, 2010 David J. Bannister, Vice President and Chief Nuclear Officer Omaha Public Power District Fort Calhoun Station FC-2-4 P.O. Box 550 Fort Calhoun, NE 68023-0550

SUMMARY

OF MEETING WITH OMAHA PUBLIC POWER DISTRICT REGARDING A PRELIMINARY SUBSTANTIAL FINDING

Dear Mr. Bannister:

This refers to the public regulatory conference meeting conducted at Arlington, Texas on August 18, 2010, between the NRC and your staff. The participants discussed the circumstances associated with a preliminary finding with substantial safety significance regarding the mitigation of a potential flood at the Fort Calhoun Station.

This meeting was classified as a Category 1 public meeting, as communicated in the meeting notice (ADAMS ML102160648). This provided an opportunity for members of the public to discuss regulatory issues with the NRC after the business portion of the meeting, but before the meeting adjourned. No comments were brought forward by the public.

The attendance list for the meeting is enclosed with this summary (Enclosure 1). A copy of the Omaha Public Power District presentation slides is also enclosed (Enclosure 2). A copy of the Omaha Public Power District meeting minutes for the external flooding expert panel for sandbagging effectiveness which was referred to during the meeting is enclosed (Enclosure 3).

In accordance with 10 CFR 2.390 of the NRC's "Rules of Practice," a copy of this letter, and its enclosures, will be available electronically for public inspection in the NRC Public Document Room or from the Publicly Available Records component of NRCs document system (ADAMS).

ADAMS is accessible from the NRC Web Site at http://www.nrc.gov/reading-rm/adams.html (the Public Electronic Reading Room).

Omaha Public Power District Should you have any questions concerning this matter, we will be pleased to discuss them with you.

Sincerely,

/RA/

Thomas R. Farnholtz, Chief Engineering Branch 1 Division of Reactor Safety Dockets: 50-285 Licenses: DPR-40

Enclosures:

1. Attendance List

2. OPPD Presentation Slides

3. Meeting Minutes - External Flooding Expert Panel for Sandbagging Effectiveness cc w/enclosures:

Jeffrey A. Reinhart Ms. Julia Schmitt, Manager Site Vice President Radiation Control Program Omaha Public Power District Nebraska Health & Human Services Fort Calhoun Station FC-2-4 Adm Division of Public Health P.O. Box 550 P.O. Box 95026 Fort Calhoun, NE 68023-0550 Lincoln, NE 68509-5026 Mr. Bill R. Hansher Ms. Melanie Rasmussen Manager (Acting) - Nuclear Licensing Radiation Control Program Officer Omaha Public Power District Bureau of Radiological Health Fort Calhoun Station FC-2-4 Adm. Iowa Department of Public Health P.O. Box 550 Lucas State Office Building, 5th Floor Fort Calhoun, NE 68023-0550 321 East 12th Street Des Moines, IA 50319 David A. Repka Winston & Strawn Chief, Technological Hazards Branch 1700 K Street, NW FEMA, Region VII Washington, DC 20006-3817 9221 Ward Parkway Suite 300 Chairman Kansas City, MO 64114-3372 Washington County Board of Supervisors Institute of Nuclear Power Operations P.O. Box 466 (INPO)

Blair, NE 68008 Records Center 700 Galleria Parkway SE, Suite 100 Atlanta, GA 30339

Omaha Public Power District Electronic distribution by RIV:

Regional Administrator (Elmo.Collins@nrc.gov)

Deputy Regional Administrator (Chuck.Casto@nrc.gov)

DRP Acting Director (Tony.Vegel@nrc.gov)

DRP Acting Deputy Director (Troy.Pruett@nrc.gov)

DRS Director (Roy.Caniano@nrc.gov)

DRS Acting Deputy Director (Jeff.Clark@nrc.gov)

Senior Resident Inspector (John.Kirkland@nrc.gov)

Resident Inspector (Jacob.Wingebach@nrc.gov)

Branch Chief, DRP/E (Jeff.Clark@nrc.gov)

Senior Project Engineer, DRP/E (Ray.Azua@nrc.gov)

Project Engineer (William.Schaup@nrc.gov)

FCS Administrative Assistant (Berni.Madison@nrc.gov)

Public Affairs Officer (Victor.Dricks@nrc.gov)

Public Affairs Officer (Lara.Uselding@nrc.gov)

Branch Chief, DRS/TSB (Michael.Hay@nrc.gov)

RITS Coordinator (Marisa.Herrera@nrc.gov)

Regional Counsel (Karla.Fuller@nrc.gov)

Congressional Affairs Officer (Jenny.Weil@nrc.gov)

OEMail Resource ROPreports OEDO RIV Coordinator (Margie.Kotzalas@nrc.gov)

R:\REACTORS\FC MS Reg Conf 8-18-19 ADAMS ML ADAMS: No 7 Yes 7 SUNSI Review Complete Reviewer Initials: GAG 7 Publicly Available 7 Non-Sensitive Non-publicly Available Sensitive KEYWORD: Fort Calhoun Station Regulatory Conference August 2010 RI:DRS/EB1 C:DRS/EB1 GGeorge TFarnholtz

/RA/ /RA/

08/24 /2010 08/26 /2010 OFFICIAL RECORD COPY T=Telephone E=E-mail F=Fax Enclosure 1 Enclosure 1 Enclosure 1 Enclosure 2 Enclosure 2 Enclosure 2 Enclosure 2 Enclosure 2 Enclosure 2 Enclosure 2 Enclosure 2 Enclosure 2 Enclosure 2 Enclosure 2 Enclosure 2 Enclosure 2 External Flooding Expert Panel for Sandbagging Effectiveness Date:

August 2, 2010 Facilitators:

Joe McManis

Participants:

Chris Moeller Senior Emergency Planning Representative Sondra Bowser: Working Crew Leader - SFM Tim Miller: Superintendent Maintenance - FCS Alexander Peters: Control Room Supervisor David Haas: Senior Nuclear Design Engineer - Mechanical Anthony Filips: Nuclear Engineer Rob Swerczek: PRA Representative Nik Vassios: Field Engineer Carl Nielsen: Project Manager Guests:

Donna Guinn: Supervisor Regulatory Compliance Justin Wiemer: PRA Co-op Brian Chee: PRA Co-op Purpose The purpose of this expert panel is to establish an approximate sandbagging success likelihood profile that represents, in a quantitative manner, the degree of confidence FCS has in the ability to protect the auxiliary building and intake structure for Missouri River floods in excess of 1010 ft up to floods of 1014 ft and the basis for that confidence level.

Background

The FCS USAR states (or at least implies) that OPPD will protect the auxiliary building and the intake structure via use of floodgates and sandbags. FCS procedures rely on sandbags for building protection above 1009.5. The guidance for implementing sandbagging protection is contained in GM-RR-AE-1002 (see attached). However, the guidance is very limited when floods are expected to exceed 1009.5 ft. Specifically, procedure GM-RR-AE-1002 calls for draping sandbags over the floodgates.

Based on NRC review of the procedure, it was concluded that there was essentially zero likelihood that sandbag berms could be constructed. Their assessment did not credit any other procedure or organization. The actual SDP assumed that even at flood levels as low as 1010 ft elevation; the credit for sandbagging was set to zero.

Enclosure 3

Issue Definition Given a flooding event is predicted to occur on the Missouri River it is important that OPPD confidently defines the sandbagging success profile. In establishing this profile the expert panel participants should consider the actual state of the plant at the time the violation was cited. Specifically,

• One sandbagging motor was missing

• Sand on site was limited

• The procedures had not yet been revised

• General site awareness of potential flood hazards was not as great as it is now Based on the drill of July 16, 2010, several observations are relevant:

• Overall staff available to fill sandbags is more than 70 people (35 per alternating shift)

• Sandbags can be filled via machine at a rate of 21 per minute

• Total number of sandbags required to protect to 1014 msl:

o Auxiliary Building: 6,500 o Intake Structure: 9,000

• Time for river rise is45-210 hours. This affects preparation time available.

• River rise forecast is based on data from the USACE.

• Site begins to flood at 1004 msl, making movement around the site difficult.

This is noted by NRC as a concern.

• Sandbag elevations necessary to protect various doors is attached Summary On Monday, August 2, 2010, the expert panel convened to discuss external flooding plant protection, procedures related to sandbagging and installation floodgates and the results of the July 16th drill. The expert panel discussed which actions would be needed to protect both the Intake Structure and Auxiliary Building. The sandbags would be pre-staged in the Intake Structure and Auxiliary Building (as mentioned in the procedure).

Input was received from multiple participants for each door. Pros and cons were weighed by participating members and a consensus of likelihood was agreed upon and documented. The items discussed for the Intake Structure were doors IS-1, IS-2, IS-3, IS-4 and IS-5 and with additional discussion on a sandbag wall between the traveling screens and Raw Water vault openings. The items discussed for the Auxiliary Building were doors 1007-1A/1B, 1007-9, 1007-19, 1011-1, 1011-2, 1011-3, 1011-4, 1011-11, 1013-4, Corridor 26 and the Room 66 grating to the stressing gallery. For the Auxiliary Building, sandbags would be brought in through the roll-up door on the railroad siding to use for the Auxiliary Building entrance door first, and then the roll-up door and railroad siding with all materials inside.

Enclosure 3

There was some discussion by maintenance personnel about the manpower and time it takes to sandbag the doors. Maintenance personnel decided that welding plates to the door would be a better use of resources in some cases. An e-mail was sent from Maintenance to Licensing which documented the welding resources available (welders, welding machines, etc.) to FCS and the ERO if needed. Maintenance mentioned that there are enough steel plates on site for flooding protection. Maintenance mentioned that the time to weld a plate to a personnel door would take 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> or less and a large door would be 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> or less.

During the discussion, the likeliness of successful protection of each opening in the Intake Structure and Auxiliary Building was determined. Each likeliness ranking referred to the percent of success of protection. The success likeliness rankings are as follows:

extremely likely = 95% success, very likely = 90%, likely = 75%, uncertain = 50%,

doubtful = 25%, very doubtful = 10% and impossible = 0%.

DEN was tasked to determine the height at which the column between the personnel door, IS-4, and roll-up door, IS-5, would lose structural integrity. DEN calculated that the column is structurally sound up to a level of 1010.8 msl. The operations representative mentioned that the sluice gate/RW pumps would be used to control water level in the cells. The expert panel decided the intake structure protection was extremely likely to a level of 1010.8 msl including operating the sluice gates and RW pumps. The expert panel decided internal (protection from trash trough) intake structure protection was impossible above 1010.8 msl.

For the Auxiliary Building, the probability of success could be determined from the levels at which the doors would be challenged. For Auxiliary Building floods up to 1010.8, the protection would be very likely, which corresponds to 90% success. For Auxiliary Building floods up to 1014, the protection were averaged over two levels, from 1010.8 to 1013, then from 1013 to 1014. For floods between level 1010.8 and 1013, the protection would be very likely, which corresponds to 90% success. For floods between 1013 to 1014, the protection would be likely, corresponding to 75%

success. To combine these values, success would be 90% for 2.2 feet, from 1010.8 to 1013, then success would be 75% for 1 foot, from 1013 to 1014. When these values are combined for a level of protection between 1010.8 to 1014, the probability of success is 85%.

Enclosure 3

The following table documents the results of the expert panel discussion.

% To Building Door Likeliness Success Level Comments Floodgate and 2550 sandbag 7 (4.5 above floodgate) pyramid 1007-1A Very spanning Radwaste and Corr. 26 w/

Aux 1B Likely 90 1014 floodgate Extremely Aux 1007-9 Likely 95 1014 Close and caulk door Floodgate and 1620 sandbag 7 Very (4.5 above floodgate) pyramid Aux 1007-19 Likely 90 1014 Add 8.25 x 4.5 plate above RR existing floodgate. Channel exists Siding Extremely to support plate and easy access to Aux Cor. 26 Likely 95 1014 sandbags if needed Extremely Aux 1011-1 Likely 95 1014 Weld 3 x 3 plate Extremely Aux 1011-2 Likely 95 1014 Weld 3 x 3.4 plate Extremely Aux 1011-3 Likely 95 1014 Weld 3 x 4.4 plate Extremely Aux 1011-4 Likely 95 1014 Weld 3 x 4.4 plate Extremely Aux 1011-11 Likely 95 1014 Weld 3 x 8.5 plate Extremely Aux 1013-4 Likely 95 1014 30 sandbags for 1 of protection DG 3x3 Plate on floor of Equipment Room hatch 1013' elev. to stressing Aux Plate Likely 75 1014 gallery requires 60 sandbags Extremely Install existing floodgate and weld Intake IS-1 Likely 95 1014 2 x 3 plate above gate Extremely Install existing floodgate and weld Intake IS-2 Likely 95 1014 2 x 3.5 plate above gate Extremely Install existing floodgate and weld Intake IS-3 Likely 95 1014 2 x 3.5 plate above gate Extremely Install existing floodgate and weld Intake IS-4 Likely 95 1014 5 x 3 plate above gate Extremely Install existing floodgate and weld Intake IS-5 95 1010.8 Likely (2) 2 x 6 plate above gate Intake IS-5 Impossible 0 1014 Install existing floodgate and weld (2) 6x1.5 plates above gate Enclosure 3

% To Building Door Likeliness Success Level Comments 4 x 8 plywood wall with plastic sheet and sandbags placed behind.

Screen Very Need knee braces - using sluice Intake 90 1011.5 Wall Likely gates and RW pumps to help control cell level, sandbag instrument trenches 4' wood wall no protection past 1011.5, requires sandbagging the Screen Intake Doubtful 25 1014 trash chute, control of gates being Wall on water side of the screen wall, throttle RW pumps Expert Panel References Used or Discussed

• PE-RR-AE-1001 Floodgate Installation and Removal

• GM-RR-AE-1002 Flood Control Preparedness for Sandbagging

• Welder and welding e-mail from Maintenance to Licensing on April 28, 2010

• FCS Floodgate Strategy

• Expert Panel Guidance - WEC

• CEOG Guidelines for Using Expert Panels

• 1011 Flood e-mail from DEN about load on Intake Structure column on August 9, 2010 Enclosure 3