ML15323A036

Request for Additional Information, Relief Requests P-1 - LPSI and CS Pumps and P-2 - Adjusting Hydraulic Parameters Consistent W/Code Case OMN-21, Fifth 10-Year Inservice Testing Interval

ML15323A036
Person / Time
Site:	Fort Calhoun
Issue date:	11/24/2015
From:	Lyon C Plant Licensing Branch IV
To:	Cortopassi L Omaha Public Power District
Lyon C
References
CAC MF6651, CAC MF6652
Download: ML15323A036 (4)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 November 24, 2015 Mr. Louis P. Cortopassi Site Vice President and Chief Nuclear Officer Omaha Public Power District Fort Calhoun Station 9610 Power Lane, Mail Stop FC-2-4 Blair, NE 68008

SUBJECT:

FORT CALHOUN STATION, UNIT NO. 1 - REQUEST FOR ADDITIONAL INFORMATION RE: FIFTH INSERVICE TESTING INTERVAL RELIEF REQUESTS P-1 AND P-2 (CAC NOS. MF6651 AND MF6652)

Dear Mr. Cortopassi:

By letter dated August 27, 2015 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML15239B214), Omaha Public Power District submitted relief requests for the fifth 10-year inservice testing program interval at Fort Calhoun Station, Unit No. 1 (FCS).

The U.S. Nuclear Regulatory Commission staff has reviewed the information provided in your application and determined that additional information is required in order to complete its formal review of relief requests P-1 and P-2. The enclosed questions were provided to B. Hansher of your staff on November 19, 2015. Please provide a response to the enclosed questions within 45 days of the date of this letter. If you have any questions, please contact me at 301-415-2296 or via e-mail at Fred.Lyon@nrc.gov.

Sincerely, Carl F. Lyon, Project Manager Plant Licensing Branch IV-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-285

Enclosure:

Request for Additional Information cc w/encl: Distribution via Listserv

REQUEST FOR ADDITIONAL INFORMATION RELIEF REQUESTS P-1 AND P-2 OMAHA PUBLIC POWER DISTRICT FORT CALHOUN STATION, UNIT NO. 1 DOCKET NO. 50-285 By letter dated August 27, 2015 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML15239B214), Omaha Public Power District submitted relief requests for the fifth 10-year inservice testing (IST) program interval at Fort Calhoun Station, Unit No. 1 (FCS).

The U.S. Nuclear Regulatory Commission staff has reviewed the information provided in your application and determined that the following additional information is required in order to complete its formal review of relief requests P-1 and P-2.

RAI P-1-1 Please provide the units of measure for the minimum flow and shutoff head values given in the table in Section 4.

RAI P-1-2 In Section 4, it states that while in an extended refueling outage, internal inspections and pump refurbishment were performed for pumps Sl-1A, Sl-1B, Sl-3B, and Sl-3C. Please explain why pump Sl-3A was not inspected internally and not refurbished, and what has been done to conclude that pump Sl-3A does not have degradation due to operating on mini-flow conditions during Group A testing. Also, provide the IST vibration data for the past 10 years for pump Sl-3A.

RAI P-1-3 Please provide performance curves and net positive suction head curves for the pumps.

RAI P-1-4 Please provide the minimum continuous stable flow for each pump.

RAI P-1-5 Please describe the purpose of the minimum flow recirculation lines and to where they discharge.

Enclosure

RAI P-1-6 Please explain why these pumps are operated on mini-flow for Group A testing.

RAI P-1-7 Section 4 states, in part, that The absolute limits for vibration of .325 in/sec for Alert and .70 in/sec for Required Action are too restrictive for the Ft. Calhoun Low Pressure Safety Injection (LPSI) and Containment Spray (CS) pumps during Group A testing as they are normally above those limits when tested.

Later in Section 4 it states, in part, that:

A review of lnservice Test (IST) history to date has determined these pumps have never exceeded the Required Action limits of ISTB-5131-1 during Group A or Comprehensive Pump Tests (CPTs).

Please explain this apparent contradiction.

RAI P-1-8 If spectral analysis is performed on the pumps, please provide the results for the past 10 years and discuss the results.

RAI P-2-1 Please discuss if plant operators will try to achieve the exact test flow or differential pressure (or discharge pressure) reference values during testing, or if they will only try to achieve a value in the reference band.

ML15323A036 *email dated OFFICE NRR/DORULPL4-1/PM NRR/DORULPL4-1/lA NRR/DE/EPNB/BC NRR/DORULPL4-1/BC NRR/DORULPL4-1/PM NAME FL yon JBurkhardt DAiiey* RPascarelli FL yon DATE 11/23/15 11/19/15 11/18/15 11/24/15 11/24/15