Morning Report for January 17, 2001
Headquarters Daily Report JANUARY 17, 2001 *************************************************************************** REPORT NEGATIVE NO INPUT ATTACHED INPUT RECEIVED RECEIVED HEADQUARTERS X REGION I X REGION II X REGION III X REGION IV X PRIORITY ATTENTION REQUIRED MORNING REPORT - HEADQUARTERS JANUARY 17, 2001 Licensee/Facility: Notification: MR Number: H-01-0001 Westinghouse Date: 01/17/01 Subject: Westinghouse - Reactor Protection for Rod Withdrawal from Subcritical in Lower Modes Discussion: Westinghouse identified an issue in Nuclear Safety Advisory Letter, NSAL-00-016, regarding the protection functions assumed for the safety analysis of the Uncontrolled Rod Control Cluster Assembly Bank Withdrawal from a Low Power or Subcritical Condition event. The information below is drawn from that document. The safety analysis contained in most Final Safety Analysis Reports uses the power range neutron flux - low setpoint trip function as the primary protection for a rod withdrawal event. This analysis credits the power range trip function for operation in Modes 1 and 2; further, it implicitly credits the source range trip function for providing similar protection during operation in Modes 3, 4, and 5. In the Final Safety Analysis Report, it is assumed that the Mode 3, 4, and 5 rod withdrawal events are bounded by the Mode 2 analysis, based upon implicitly crediting the source range reactor trip function. A rod withdrawal transient could occur in these lower modes if the trip breakers were closed. However, the safety analysis should only credit reactor trip functions that meet the requirements of IEEE 279-1971, including seismic qualification. Since the source range trip function is not usually time response tested or seismically qualified, the assumption that the Mode 2 rod withdrawal analysis bounds the lower modes of operation may be unwarranted. To address this issue, some utilities have changed the power range neutron flux - low setpoint function to be operable in Mode 3 in addition to Modes 1 and 2. Unfortunately, this solution does not account for the possibilities of a rod withdrawal event during Modes 4 or 5. Also, the power range setpoint may not be operable for much of Mode 3. Westinghouse states that if the plant were in Mode 3 at a temperature significantly below the no-load temperature, the power range neutron flux - low setpoint would be incorrectly calibrated due to shielding caused by the lower temperature water in the down comer. In assessing the safety significance of this issue, Westinghouse concludes that there is "...no major reduction in the degree of protection provided..." Even though the source range trip function is not periodically time response tested, Westinghouse states that the source range trip time for the Mode 3, 4, or 5 rod withdrawal event, assuming degraded source range channels, would be less than 1.0 second. They also assert that it is very unlikely that a seismic event would occur concurrently with an energized rod control system well below the no load temperature in Modes 3, 4, or 5. As a corrective action, Westinghouse proposes two options. The first option is to seismically qualify and time response test the source range reactor trip function. Westinghouse goes on to note that a risk informed approach might eliminate the need for seismic qualification. The second HEADQUARTERS MORNING REPORT PAGE 2 JANUARY 17, 2001 MR Number: H-01-0001 (cont.) option is to revise the plant procedures. One possible procedure revision would be to prevent RCCA withdrawal capability until the system Tavg is above the minimum temperature for criticality and the power range trip function is operable. A second procedure revision option would be to increase reactor coolant system boron concentration to a level where the reactor would remain subcritical with "all-rods-out." Contact: Sean Peters, NRR 301-415-3469 E-mail: sep@nrc.gov _ REGION I MORNING REPORT PAGE 2 JANUARY 17, 2001 Licensee/Facility: Notification: New York Power Authority MR Number: 1-01-0002 Indian Point 3 Date: 01/17/01 Buchanan,New York Dockets: 50-286 PWR/W-4-LP Subject: RE-ORGANIZATION OF INDIAN POINT 3 PLANT MANAGEMENT STRUCTURE Discussion: Effective January 15, 2001 the IP3 site organizational structure was changed as follows: (1) the plant manager position is now the General Manager of Plant Operations (F. Dacimo) who reports directly to the Vice President of Operations - IP3 (R. Barrett); (2) all former General Manager positions reporting to the Plant Manager have been eliminated. Now reporting directly to the General Manager of Plant Operations are the Managers of Operations (P. Rubin), Maintenance (A. Vitale), Health Physics/Chemistry (D. Mayer), and Planning and Scheduling (R. Cavalieri). The manager of the newly created department of Projects (J. Russell) also reports to the General Manager of Plant Operations; (3) The Plant Licensing (K. Peters) and Corrective Action/Assessment (D. Landeche) managers now report to the newly created Director of Safety Assurance (J. Comiotes), who in turn reports directly to the Vice President of Operations - IP3. The Training Manager (J. Wheeler) now reports directly to the Vice President of Operations - IP3. The site Director of Engineering (J. DeRoy), the Manager of Human Resources (D. Birnbaum), and the Manager of Communications (J. Steets) now report indirectly to the Vice President of Operations - IP3. These changes were implemented to bring IP3 organizational structure in line with the current Entergy model. Regional Action: None. Contact: Robert Summers (610)337-5282 Peter Drysdale (914)739-8565 _ REGION II MORNING REPORT PAGE 3 JANUARY 17, 2001 Licensee/Facility: Notification: Tennessee Valley Authority MR Number: 2-01-0001 Browns Ferry 1 2 3 Date: 01/17/01 Decatur,Alabama Dockets: 50-259,50-260,50-296 BWR/GE-4,BWR/GE-4,BWR/GE-4 Subject: TENNESSEE VALLEY AUTHORITY NUCLEAR (TVAN) ANNOUNCES MANAGEMENT CHANGES Discussion: On January 12, 2001, Chief Nuclear Officer, John Scalice announced that John Herron, the Browns Ferry Site Vice President, was resigning to accept a position as Site Vice President with Entergy's Waterford 3 facility in Louisiana. Mr Herron's resignation is effective January 19, 2001. Until a replacement for Mr. Herron is selected, Karl Singer, Senior Vice President, Nuclear Operations who once served as the Browns Ferry Site Vice President, will oversee activities at the site. Regional Action: None. Contact: Paul Fredrickson (404)562-4530 _
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Page Last Reviewed/Updated Wednesday, March 24, 2021