ML16265A165

Ltr 09/20/16 Prairie Island Nuclear Generating Plant, Units 1 and 2 - Notification of an NRC Triennial Heat Sink Performance Inspection and Request for Information; Inspection Report 05000282/2016004; 05000306/2016004 (GFO)

ML16265A165
Person / Time
Site:	Prairie Island
Issue date:	09/20/2016
From:	O'Dwyer G F NRC/RGN-III/DRS/EB2
To:	Northard S Northern States Power Company, Minnesota
References
IR 2016004
Download: ML16265A165 (8)

See also: IR 05000282/2016004

Text

September 20, 2016

Mr. Scott Northard Site Vice President Prairie Island Nuclear Generating Plant Northern States Power Company, Minnesota 1717 Wakonade Drive East Welch, MN 55089

SUBJECT: PRAIRIE ISLAND NUCLEAR GENERATING PLANT, UNITS 1 AND 2 NOTIFICATION OF AN NRC TRIENNIAL HEAT SINK PERFORMANCE INSPECTION AND REQUEST FOR INFORMATION; INSPECTION REPORT 05000282/2016004; 05000306/2016004

Dear Mr. Northard:

On November 14, 2016, the U.S. Nuclear Regulatory Commission (NRC) will begin the onsite portion of the Triennial Heat Sink Performance Inspection at your Prairie Island Nuclear Power Plant, Units 1 and 2. This inspection will be performed in accordance with NRC baseline Inspection Procedure 71111.07. In order to minimize the impact that the inspection has on the site and to ensure a productive inspection, we have enclosed a request for documents needed for the inspection. The documents have been divided into three groups. The first group lists information necessary for our initial inspection scoping activities. This information should be available to the lead inspector no later than September 30, 2016. By October 10, 2016, the inspector will communicate the initial selected set of approximately 2-3 risk-significant heat exchangers. The second group is needed to support our in-office preparation activities. This set of documents, including the calculations associated with the selected heat exchangers, should be available at the Regional Office no later than October 31, 2016. This information should be separated for each selected component, especially if provided electronically (e.g., folder with component name that includes calculations, condition reports, maintenance history, etc.). During the in-office preparation activities, the inspector may identify additional information needed to support the inspection. The last group includes the additional information above as well as plant specific reference material. This information should be available onsite to the inspector on November 14, 2016. It is also requested that corrective action documents and/or questions developed during the inspection be provided to the inspector as the documents are generated. All requested documents are to be for the time period from the onsite inspection period back to the documents that were provided in response to the previous Heat Sink Performance Inspection. If no activities were accomplished in that time period, then the request applies to the last applicable document in the previous time period. It is important that these documents be as complete as possible, in order to minimize the number of documents requested during the preparation week or during the onsite inspection. We understand that our licensing contact for this inspection is Pamela Johnson of your organization and she has been informed that . If there are any questions about the inspection or the material requested in the enclosure, please contact the lead inspector at 630-829-9624 or via e-mail at Gerard.ODwyer@nrc.gov. This letter does not contain new or amended information collection requirements subject to the Paperwork Reduction Act of 1995 (44 U.S.C. 3501 et seq.). Existing information collection requirements were approved by the Office of Management and Budget, Control Number 3150-0011. The NRC may not conduct or sponsor, and a person is not required to respond to, a request for information or an information collection requirement unless the requesting document displays a currently valid Office of Management and Budget Control Number. In accordance with Title 10 of the Code of Federal Regulations tice," a copy of this letter, its enclosure, and your response (if any) will be available electronically for public component of the NRC's Agencywide Documents Access and Management System (ADAMS). ADAMS is accessible from the NRC Web site at http://www.nrc.gov/reading-rm/adams.html (the Public Electronic Reading Room).

Sincerely,/RA/ Reactor Inspector Engineering Branch 2 Division of Reactor Safety Docket Nos. 50282, 50306 License Nos. DPR42, DPR60

Enclosure:

Triennial Heat Sink Performance Inspection Document Request cc: Distribution via LISTSERV TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST Enclosure Inspection Report: 05000282/2016004; 05000306/2016004 Inspection Dates: November 14 18, 2016 Inspection Procedure: Lead Inspector: 630-829-9624 Gerard.ODwyer@nrc.gov I. Information Requested By September 30, 2016: 1. List of the Generic Letter (GL) 89-cting Safety- heat exchangers in order of risk significance. 2. Copy of heat exchanger performance trending data tracked for each GL 89-13 heat exchanger. 3. List of Corrective Action Program (CAP) documents (with a short description) associated with GL 89-13 heat exchangers, heat sinks, silting, corrosion, fouling, or heat exchanger testing, for the previous 3 years or since the last CAP document list was sent to the U.S. Nuclear Regulatory Commission for the previous Heat Sink Performance Inspection. The list should include all CAP documents not on the last CAP list. 4. Copy of any self-assessment done on any of GL 89-13 heat exchangers. 5. Last two System Health Report(s) and maintenance rule system notebooks for all the GL 89-13 heat exchangers. 6. List of engineering-related operator workarounds (with a short description) associated with GL 89-13 heat exchangers. The requested documents are to be for the time period from the onsite inspection period back to the documents that were provided in response to the previous Heat Sink Performance Inspection. 7. List of permanent and temporary modifications (with a short description) associated with GL 89-13 heat exchangers. The requested documents are to be for the time period from the onsite inspection period back to the documents that were provided in response to the previous Heat Sink Performance Inspection. 8. A schedule of all inspections, cleanings, maintenance, or testing of any safety-related plant heat exchanger to be performed during the onsite portion of the inspection. II Information Requested By October 31, 2016: 1. Copies of the GL 89-13 responses. 2. Copy of the Updated Final Safety Analysis Report (UFSAR) section applicable to the GL 89-13 Heat Exchanger Program.

TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST 2 3. Copies of procedures developed to implement the recommendations of GL 89-13 (e.g., the GL 89-13 Heat Exchanger Program description). 4. Copies of the selected CAP documents. 5. For the specific heat exchangers selected: a. Copies of the UFSAR sections applicable for each heat exchanger. b. Copy of system description and design basis document for the heat exchangers (as applicable). c. Provide a list of calculations (with a short description) which currently apply to each heat exchanger to: i. establish the limiting design basis heat load required to be removed by each of these heat exchangers; ii. demonstrate the heat exchangers capacity to remove the limiting heat load; iii. correlate surveillance testing and/or inspection results from these heat exchangers with design basis heat removal capability (e.g., basis for surveillance test and/or inspection acceptance criteria); iv. evaluate the potential for water hammer in each heat exchanger or associated piping; and v. evaluate excessive tube vibration in each heat exchanger. d. Copy of any operability determinations or other documentation of degradation associated with the heat exchangers or the systems that support the operation for the selected heat exchangers. e. Copy of the construction code, Design Specification, heat exchanger data sheets, and vendor documents including component drawings applicable for the heat exchangers. f. Copies of normal, abnormal, and emergency operating procedures associated with the selected heat exchangers. 6. For the Ultimate Heat Sink (UHS) including the Emergency Cooling Water Intake Pipe: a. Copies of the applicable UFSAR sections. b. Copy of system description and design basis document (as applicable). c. Copy of any operability determinations or other documentation of degradation associated with the UHS. d. Copy of the section of the document (e.g., UFSAR or Technical Requirements Manual) that states the maximum safety related service water system inlet temperature limit that still allows full licensed power operation of the nuclear reactor. e. Copy of system description and design basis document (as applicable).

TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST 3 f. Copy of the construction code and Design Specification for the UHS. g. Copies of normal, abnormal, and emergency operating procedures associated with the UHS including procedures for loss of UHS. h. Provide an electronic copy of piping and instrumentation diagrams or other appropriate drawings for the service water system and the UHS, including the intake structure. i. Provide a list of calculations (with a short description), which currently apply to UHS. j. Provide a list of instruments (with a short description) associated with automatic or alarm functions for the UHS. k. Provide a list of any design change (with a short description) performed on the UHS since the last Heat Sink Performance Inspection. 7. An updated schedule of all inspections, cleanings, maintenance, or testing of any safety-related plant heat exchanger to be performed during the on-site portion of the inspection. III Information Requested to be Available on First Day of Inspection, November 14, 2016: 1. For both units, please provide a computer copy of UFSAR, Technical Specifications and Bases, and Technical Requirements Manual. 2. For the specific heat exchangers selected. a. Copy of the calculation which correlates surveillance testing results from these heat exchangers with design basis heat removal capability (e.g., basis for surveillance test acceptance criteria). b. Copies of the two most recent completed tests and evaluation data confirming thermal performance for those heat exchangers which are performance tested. c. Documentation and procedures that identify the types, accuracy, and location of any special instrumentation used for the two most recently completed thermal performance tests for the heat exchangers (e.g., high accuracy ultrasonic flow instruments or temperature instruments). Include calibration records for the instruments used during these tests. d. Information regarding any alarms which monitor online performance. e. Copy of the document describing the inspection results of each heat exchanger. The requested documents are to be for the time period from the onsite inspection period back to the documents that were provided in response to the previous Heat Sink Performance Inspection. f. The cleaning and inspection maintenance schedule for each heat exchanger for the next 5 years. g. Copy of the design specification and heat exchanger data sheets for each heat exchanger.

TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST 4 h. Copy of the vendor manuals including component drawings for each heat exchanger. i. Copy of the calculation which establishes the limiting (maximum) design basis heat load which is required to be removed by each of these heat exchangers. j. Copy of the operating procedure that ensures that the maximum cooling water system inlet temperature limit is not exceeded. k. Copy of the calculations or documents which evaluate the potential for water hammer in each heat exchanger or associated piping. l. Copy of the calculations that evaluate excessive tube vibration in each heat exchanger and the documents that describe the controls that prevent heat exchanger degradation due to excessive flow induced vibration during operation. m. Copy of the periodic flow testing at or near maximum design flow. The requested documents are to be for the time period from the onsite inspection period back to the documents that were provided in response to the previous Heat Sink Performance Inspection. n. Copy of the document which identifies the current number of tubes in service for each heat exchanger and the supporting calculation which establishes the maximum number of tubes which can be plugged in each heat exchanger. o. Copy of the document establishing the repair criteria (plugging limit) for degraded tubes which are identified in each heat exchanger. p. Copies of the documents that verify the structural integrity of the heat exchanger (e.g., eddy current summary sheets, ultrasonic testing results, and visual inspection results). q. Copies of those documents that describe the methods taken to control water chemistry in the heat exchangers. 3. For the UHS including the Emergency Cooling Water Intake Pipe: a. Copies of the inspection procedures of the rip rap protection placed on excavated side slopes and the associated results. The requested documents are to be for the time period from the onsite inspection period back to the documents that were provided in response to the previous Heat Sink Performance Inspection. b. Copies of the dam inspection procedures that monitor the integrity of the heat sink and the associated results. The requested documents are to be for the time period from the onsite inspection period back to the documents that were provided in response to the previous Heat Sink Performance Inspection. c. Copies of calculations and surveillances that demonstrate the UHS reservoir capacity and heat transfer capability including the Emergency Cooling Water Intake Pipe. d. Copies of the inspection procedures for the verification of the structural integrity of underwater UHS and the associated results. The requested documents are to be for the time period from the onsite inspection period back to the documents that were provided in response to the previous Heat Sink Performance Inspection.

TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST 5 e. Copies of the maintenance and/or inspection procedures for underwater UHS sediment intrusion and the associated results including underwater diving inspections and/or sediment removal activities. The requested documents are to be for the time period from the onsite inspection period back to the documents that were provided in response to the previous Heat Sink Performance Inspection. f. Copies of the procedures used for verifying that adjacent non-seismic or nonsafety-related structures cannot degrade or block safety-related flow paths during severe weather or seismic events. g. Copy of the calculation associated with the structural integrity of the UHS. The requested documents are to be for the time period from the onsite inspection period back to the documents that were provided in response to the previous Heat Sink Performance Inspection. 4. For the review associated with the system walkdown of the service water intake structure: a. Copies of corrective maintenance for the last 6 years associated with service water strainers, traveling screens and trash racks. b. Copies of the last two inspections and/or surveillances associated with service water strainers, traveling screens and trash racks. c. List of preventive maintenance, including frequency, associated with service water strainers, traveling screens and trash racks. d. Copies of abnormal procedures for the traveling screens and service water strainers. e. Copies of the last two inspections and/or surveillances documenting that component mounts have not excessively degraded (i.e., due to corrosion). For example, inspections for the mounts for the, Service water pumps, service water strainers, traveling screens and trash racks. f. Copies of the documents associated with the monitoring, trending, and remediation of silt accumulation at the service water pump bay. g. Copies of surveillance procedures and testing results performed on the service water pump bay water level instruments. The requested documents are to be for the time period from the onsite inspection period back to the documents that were provided in response to the previous Heat Sink Performance Inspection. h. Copies of procedures associated with operating during adverse weather conditions (e.g., icing, high temperatures, or low level). i. Copy of the evaluation for the potential effects of low flow/level on underwater weir walls intended to limit silt or sand intake, if applicable. If any of the information requested above will as soon as possible at 630-829-9624 or e-mail at Gerard.ODwyer@nrc.gov.