ML030590485

RAI, Integrated Leak Rate Test (ILRT) Extension Request

ML030590485
Person / Time
Site:	Three Mile Island
Issue date:	02/28/2003
From:	Colburn T NRC/NRR/DLPM/LPD1
To:	Skolds J AmerGen Energy Co
Colburn T
References
TAC MB6487
Download: ML030590485 (5)

Text

February 28, 2003 Mr. John L. Skolds, Chairman and Chief Executive Officer AmerGen Energy Company, LLC 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION (RAI) FAXED TO THE LICENSEE RE: THREE MILE ISLAND NUCLEAR STATION, UNIT-1 (TMI-1), INTEGRATED LEAK RATE TEST (ILRT) EXTENSION REQUEST (TAC NO. MB6487)

Dear Mr. Skolds:

By letter dated September 30, 2002, you requested a license amendment to revise the TMI-1 Technical Specifications (TSs) to allow a one-time deferral until no later than September 2008, of the scheduled performance of the next Type A containment ILRT. TS 6.8.5 would otherwise require the next ILRT to be performed by October 2003. The Nuclear Regulatory Commission staff has reviewed your request and determined that it will need the additional information contained in the enclosure to complete its review. As discussed with and agreed to by your staff on February 20, 2003, you are requested to provide your response within 30 days receipt of this request.

If you have any questions, please contact me at 301-415-1402.

Sincerely,

/RA/

Timothy G. Colburn, Senior Project Manager, Section 1 Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-289

Enclosure:

RAI cc w/encl: See next page

February 28, 2003 Mr. John L. Skolds, Chairman and Chief Executive Officer AmerGen Energy Company, LLC 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION (RAI) FAXED TO THE LICENSEE RE: THREE MILE ISLAND NUCLEAR STATION, UNIT-1 (TMI-1), INTEGRATED LEAK RATE TEST (ILRT) EXTENSION REQUEST (TAC NO. MB6487)

Dear Mr. Skolds:

By letter dated September 30, 2002, you requested a license amendment to revise the TMI-1 Technical Specifications (TSs) to allow a one-time deferral until no later than September 2008, of the scheduled performance of the next Type A containment ILRT. TS 6.8.5 would otherwise require the next ILRT to be performed by October 2003. The Nuclear Regulatory Commission staff has reviewed your request and determined that it will need the additional information contained in the enclosure to complete its review. As discussed with and agreed to by your staff on February 20, 2003, you are requested to provide your response within 30 days receipt of this request.

If you have any questions, please contact me at 301-415-1402.

Sincerely,

/RA/

Timothy G. Colburn, Senior Project Manager, Section 1 Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-289

Enclosure:

RAI cc w/encl: See next page DISTRIBUTION:

PUBLIC DTerao OGC PDI-1 Reading MRubin ACRS RLaufer RPalla BPlatchek, Rgn-I MOBrien SUniquewicz TColburn Accession Number: ML OFFICE PDI-1/PM PDI-1/LA EMEB/SC SPSB/SC PDI-1/SC NAME TColburn MOBrien DTerao MRubin RLaufer DATE 2/27/ 03 2/27/03 2/27/03 2/27/03 2/27/03 OFFICIAL RECORD COPY

REQUEST FOR ADDITIONAL INFORMATION THREE MILE ISLAND NUCLEAR STATION, UNIT 1 (TMI-1)

REGARDING INTEGRATED LEAK RATE TEST (ILRT) EXTENSION REQUEST DOCKET NO. 50-289

1. Please provide specifics on what is the accessible surface of the containment liner that was examined. Sketches or drawings would be helpful.

2. Please provide specifics on exam results including nondestructive examination exam data (surface and volumetric), trending information on corrosion and wall thickness measurements especially in the area of the moisture barrier interface.

3. Please provide any other specific data and supporting information that the licensee may have used to conclude that there is no thinning of the liner and that the concrete interface is intact in all locations.

4. Inspections of some reinforced and steel containments (e.g., North Anna, Brunswick, D. C.

Cook, and Oyster Creek) have indicated degradation from the uninspectable (embedded) side of the steel shell and liner of primary containments. The major uninspectable areas of the TMI-1 containment include the portion of the steel shell embedded in the basemat and the inaccessible areas between the steel liner and concrete containment. Please provide a quantitative assessment of the impact on large early release frequency (LERF) due to age-related degradation in these areas, in support of the requested ILRT interval extension from 10 to 15 years.

5. Please provide an assessment of the impact of observed liner corrosion/thinning at the moisture barrier on the containment ultimate pressure capacity credited in the Level 2 probability risk assessment (i.e., the probability of containment over-pressure failure as a function of containment pressure). Discuss any relationship between those portions of the liner affected by the observed corrosion, and the most likely containment failure locations according to the ultimate pressure capacity analysis.

6. The September 30, 2002, submittal states that the increase in LERF associated with a change in test frequency from 1 test in 10 years to 1 test in 15 years is 2.6E-7/year when both internal and external events are considered. Please provide the corresponding risk result assuming a change in test frequency from 3 tests in 10 years to 1 test in 15 years.

7. Provide the technical justification for the assumption in the risk analysis that all release categories with fission product scrubbing (according to the general characteristics described in the notes to Table 2-2 in Attachment 4, to the September 30, 2002, application) will leave sufficient scrubbing such that these releases will not contribute to LERF. Include the definition of LERF used for this determination.

Enclosure

Three Mile Island Nuclear Station, Unit 1 cc:

Site Vice President - Three Mile Island Nuclear Senior Resident Inspector (TMI-1)

Station, Unit 1 U.S. Nuclear Regulatory Commission AmerGen Energy Company, LLC P.O. Box 219 P. O. Box 480 Middletown, PA 17057 Middletown, PA 17057 Director - Licensing - MId-Atlantic Regional Senior Vice President Nuclear Services Operating Group AmerGen Energy Company, LLC AmerGen Energy Company, LLC 4300 Winfield Road Nuclear Group Headquarters Warrenville, IL 60555 Correspondence Control P.O. Box 160 Vice President - Mid-Atlantic Operations Support Kennett Square, PA 19348 AmerGen Energy Company, LLC 200 Exelon Way, KSA 3-N Rich Janati, Chief Kennett Square, PA 19348 Division of Nuclear Safety Bureau of Radiation Protection Senior Vice President - Department of Environmental Protection Mid Atlantic Regional Operating Group Rachel Carson State Office Building AmerGen Energy Company, LLC P.O. Box 8469 200 Exelon Way, KSA 3-N Harrisburg, PA 17105-8469 Kennett Square, PA 19348 Three Mile Island Nuclear Station, Unit 1 Vice President - Plant Manager Licensing and Regulatory Affairs AmerGen Energy Company, LLC AmerGen Energy Company, LLC P. O. Box 480 4300 Winfield Road Middletown, PA 17057 Warrenville, IL 60555 Regulatory Assurance Manager - Three Mile Regional Administrator Island Nuclear Station, Unit 1 Region I AmerGen Energy Company, LLC U.S. Nuclear Regulatory Commission P.O. Box 480 475 Allendale Road Middletown, PA 17057 King of Prussia, PA 19406 John F. Rogge, Region I Chairman U.S. Nuclear Regulatory Commission Board of County Commissioners 475 Allendale Road of Dauphin County King of Prussia, PA 19406 Dauphin County Courthouse Harrisburg, PA 17120 Michael A. Schoppman Framatome ANP Chairman Suite 705 Board of Supervisors 1911 North Ft. Myer Drive of Londonderry Township Rosslyn, VA 22209 R.D. #1, Geyers Church Road Middletown, PA 17057

Three Mile Island Nuclear Station, Unit 1 cc: continued Vice President, General Counsel and Secretary AmerGen Energy Company, LLC 2301 Market Street, S23-1 Philadelphia, PA 19101 Dr. Judith Johnsrud National Energy Committee Sierra Club 433 Orlando Avenue State College, PA 16803 Eric Epstein TMI Alert 4100 Hillsdale Road Harrisburg, PA 17112 Correspondence Control Desk AmerGen Energy Company, LLC 200 Exelon Way, KSA 1-N Kennett Square, PA 19348 Manager Licensing - Oyster Creek and Three Mile Island AmerGen Energy Company, LLC Nuclear Group Headquarters Correspondence Control P.O. Box 160 Kennett Square, PA 19348