ML051540465
| ML051540465 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 06/03/2005 |
| From: | Chernoff H NRC/NRR/DLPM |
| To: | Koehl D Nuclear Management Co |
| Chernoff, H, NRR/DLPM, 301-415-4018 | |
| References | |
| TAC MC6729 | |
| Download: ML051540465 (6) | |
Text
June 3, 2005 Mr. Dennis Koehl Site Vice President Point Beach Nuclear Plant Nuclear Management Company, LLC 6610 Nuclear Road Two Rivers, WI 54241-9516
SUBJECT:
POINT BEACH NUCLEAR POWER PLANT, UNIT 2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING PROPOSED LICENSE AMENDMENT FOR REACTOR VESSEL HEAD HANDLING (TAC NO. MC6729)
Dear Mr. Koehl:
The Nuclear Regulatory Commission (NRC) staff has reviewed your license amendment request for Point Beach Nuclear Power Plant Unit Nos. 1 and 2 dated April 29, 2005 (ML051300534), as supplemented by letters dated May 13 (ML051450351) and May 19, 2005 (not yet available in public electronic reading room). The proposed amendment would incorporate an analysis of a reactor vessel head handling event into the Final Safety Analysis Report. Your letter dated May 13, 2005, superceded the April 29, 2005, submittal and modified the proposed amendment to apply only to Unit 2. On May 27, 2005 (ML051470299), NRC staff submitted a request for additional information. You responded to this request by letter dated June 1, 2005 (not yet available in public electronic reading room). The NRC staff has identified areas where additional information is needed to complete its review of the amendment request.
The enclosure provides the NRC staffs request for additional information related to the May 13, 2005, supplement. On June 3, 2005, these questions were informally provided to your staff for review to ensure that the intent of the questions was clearly understood and/or to identify any instances where the requested information had already been provided to the NRC staff on the docket. A mutually agreeable response date of June 6, 2005 was established with Mr. Aldo Capristo.
If you have any questions, please contact me at (301) 415-4018.
Sincerely,
/RA/
Harold K. Chernoff, Project Manager, Section 1 Project Directorate III Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-301
Enclosure:
As stated cc w/encl: See next page
ML051540465 OFFICE PM:PDIII-1 PM:PDIII-1 LA:PDIII-1 SC:PDIII-1 NAME SRay HChernoff DClarke LRaghavan DATE 06/03/05 06/03/05 06/03/05 06/03/05
Point Beach Nuclear Plant, Unit 2 Reactor Vessel Head Handling Event Request for Additional Information Docket No. 50-301 The following additional information related to your May 13, 2005, letter is being requested by Nuclear Regulatory Commission staff:
- 1.
What were the bases for establishing the human error probability (HEP) of 4.5E-4 for failure to initiate containment spray, and failure to establish sump recirculation after refueling water storage tank draindown in the postulated large loss-of-coolant accident scenario? What accident diagnosis and performance shaping factors were considered in the calculation of the HEP?
- 2.
How did these HEPs, in combination with other equipment failure probabilities, in the postulated accident sequence(s) result in a conditional core damage probability (CCDP) estimate of 7.3E-3? What were the dominant cutsets that contributed significantly to the CCDP estimate of 7.3E-3? Which of the two HEPs were the significant risk drivers in the dominant cutsets?
3.
What is the impact on the CCDP estimate if the HEP values were 1E-3, 1E-2, or 1E-1 instead of 4.5E-4?
4.
Please discuss the impact of the response to Question 5 in your May 13, 2005 letter on the probabilistic risk analysis.
Point Beach Nuclear Plant, Units 1 and 2 cc:
Jonathan Rogoff, Esquire Vice President, Counsel & Secretary Nuclear Management Company, LLC 700 First Street Hudson, WI 54016 Mr. F. D. Kuester President & Chief Executive Officer WE Generation 231 West Michigan Street Milwaukee, WI 53201 Regulatory Affairs Manager Point Beach Nuclear Plant Nuclear Management Company, LLC 6610 Nuclear Road Two Rivers, WI 54241 Mr. Ken Duveneck Town Chairman Town of Two Creeks 13017 State Highway 42 Mishicot, WI 54228 Chairman Public Service Commission of Wisconsin P.O. Box 7854 Madison, WI 53707-7854 Regional Administrator, Region III U.S. Nuclear Regulatory Commission 801 Warrenville Road Lisle, IL 60532-4351 Resident Inspector's Office U.S. Nuclear Regulatory Commission 6612 Nuclear Road Two Rivers, WI 54241 Mr. Jeffery Kitsembel Electric Division Public Service Commission of Wisconsin P.O. Box 7854 Madison, WI 53707-7854 Nuclear Asset Manager Wisconsin Electric Power Company 231 West Michigan Street Milwaukee, WI 53201 John Paul Cowan Executive Vice President & Chief Nuclear Officer Nuclear Management Company, LLC 700 First Street Hudson, WI 54016 Douglas E. Cooper Senior Vice President - Group Operations Palisades Nuclear Plant Nuclear Management Company, LLC 27780 Blue Star Memorial Highway Covert, MI 49043 Site Director of Operations Nuclear Management Company, LLC 6610 Nuclear Road Two Rivers, WI 54241