ML043230361

(TMI-1), RAI,Bulletin 2003-01, Potential Impact of Debris Blockage on Emergency Sump Recirculation at Pressurized-Water Reactors,

ML043230361
Person / Time
Site:	Three Mile Island
Issue date:	12/17/2004
From:	Colburn T NRC/NRR/DLPM/LPD1
To:	Crane C AmerGen Energy Co
Colburn T, NRR/DLPM, 415-1402
References
BL-03-001, TAC MC9620
Download: ML043230361 (5)

Text

December 17, 2004 Mr. Christopher M. Crane President and Chief Executive Officer AmerGen Energy Company, LLC 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

BULLETIN 2003-01, POTENTIAL IMPACT OF DEBRIS BLOCKAGE ON EMERGENCY SUMP RECIRCULATION AT PRESSURIZED-WATER REACTORS, FOR THREE MILE ISLAND NUCLEAR STATION, UNIT 1 (TMI-1), REQUEST FOR ADDITIONAL INFORMATION (RAI) (TAC NO.

MB9620)

Dear Mr. Crane:

By letter dated August 6, 2003, as supplemented July 6, 2004, you submitted your response to Nuclear Regulatory Comission (NRC)Bulletin 2003-01. The NRC staff has reviewed your submittals and determined that it will need the additional information contained in the enclosure in order to complete our review of the containment sump screen debris blocking issue at TMI-1.

As discussed with and agreed to by your staff, 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

December 17, 2004 Mr. Christopher M. Crane President and Chief Executive Officer AmerGen Energy Company, LLC 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

BULLETIN 2003-01, POTENTIAL IMPACT OF DEBRIS BLOCKAGE ON EMERGENCY SUMP RECIRCULATION AT PRESSURIZED-WATER REACTORS, FOR THREE MILE ISLAND NUCLEAR STATION, UNIT 1 (TMI-1), REQUEST FOR ADDITIONAL INFORMATION (RAI) (TAC NO.

MB9620)

Dear Mr. Crane:

By letter dated August 6, 2003, as supplemented July 6, 2004, you submitted your response to Nuclear Regulatory Comission (NRC)Bulletin 2003-01. The NRC staff has reviewed your submittals and determined that it will need the additional information contained in the enclosure in order to complete our review of the containment sump screen debris blocking issue at TMI-1.

As discussed with and agreed to by your staff, 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 SWeerakkody OGC PDI-1 Reading TColburn ACRS RLaufer LWhitney GMatakas, Rgn-I MOBrien Accession Number: ML043230361 OFFICE PDI-1/PM PDI-1/LA SPLB/SC PDI-1/SC NAME TColburn MOBrien DSolario for SWeerakkody RLaufer DATE 11/22/04 11/22/04 12/10/04 12/14/04 OFFICIAL RECORD COPY

REQUEST FOR ADDITIONAL INFORMATION (RAI)

THREE MILE ISLAND NUCLEAR STATION, UNIT 1 (TMI-1)

BULLETIN 2003-01, POTENTIAL IMPACT OF DEBRIS BLOCKAGE ON CONTAINMENT EMERGENCY SUMP RECIRCULATION AT PRESSURIZED-WATER REACTORS The Nuclear Regulatory Commission (NRC) staff has reviewed the TMI-1 licensees August 6, 2003, as supplemented July 6, 2004, response to Bulletin 2003-01, and has determined that the additional information requested below is needed for the NRC staff to complete its review.

1. For TMI-1, has the licensee done any risk-assessment or quantitative/qualitative analysis to evaluate throttling emergency core cooling system (ECCS)/

containment spray (CS) system as a measure to delay switchover to sump recirculation?

2. Please re-answer RAI question No. 1 from your July 6, 2004, RAI response letter. The response given (start recirculation EARLY (emphasis added) using one CS pump to refill the borated water storage tank (BWST)), is contradictory to the key premise of the original question (the purpose of refilling the BWST is to DELAY (emphasis added) having to use sump recirculation).

3. Has, or will, the licensee provide training to inform operators to consider the option of aggressive cooldown as a strategy for small loss-of-coolant accident (LOCA) events? If not, why not?

4. Please provide a more detailed discussion regarding TMI-1 evaluations of ECCS pump and valve susceptibility to clogging/damage/loss of lubrication/loss of cooling (e.g. wetted soft-surface pump bearings, pump flow channels, and valve seats) due to small debris downstream of sump screens.

5. On page 4 of the July 6, 2004, RAI response, the licensee correctly stated that the WOG [Westinghouse Owners Group] guidance provided the following actions for consideration as interim measures: (a) Secure one or both trains of containment spray prior to switchover. On that same page, the licensee stated that TMI-1 has incorporated a modified version of (a) into symptom-based guidance... to reduce draw on the sump whenever containment spray is not absolutely needed for dose or containment pressure reduction. On page 2 of the licensees July 6, 2004, response, the licensee also stated, in response to Bulletin 2003-01, we enhanced the emergency procedures to provide the following guidance in regard to ECCS operation after switchover to ECCS sump suction: ...3. SHUTDOWN both containment spray trains based on other emergency procedure guidance...

Please provide the rationale for not implementing procedures to secure one or both CS trains prior to sump recirculation.

Enclosure

Three Mile Island Nuclear Station, Unit 1 cc:

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

U.S. Nuclear Regulatory Commission P.O. Box 219 Middletown, PA 17057

Three Mile Island Nuclear Station, Unit 1 cc:

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 P.O. Box 160 Kennett Square, PA 19348 Manager Licensing - Three Mile Island Nuclear Station, Unit 1 Exelon Generation Company, LLC 200 Exelon Way, KSA 3-E Kennett Square, PA 19348 Associate General Counsel AmerGen Energy Company, LLC 4300 Winfield Road Warrenville, IL 60555