ML17187B145
| ML17187B145 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 10/02/1997 |
| From: | Stang J NRC (Affiliation Not Assigned) |
| To: | Johnson I COMMONWEALTH EDISON CO. |
| Shared Package | |
| ML17187B146 | List: |
| References | |
| GL-88-20, TAC-M96178, TAC-M96179, NUDOCS 9710100113 | |
| Download: ML17187B145 (4) | |
Text
..
October 2, 1997 Ms. Irene Johnson. Acting Manager Nuclear'Regulatory Services
' Commonwealth Edison Company Executive Towers West III 1400 Opus Place. Suite 500 Downers Grove. IL 60515
SUBJECT:
DRESDEN. UNITS 2 AND 3. MODIFIED AND UPDATED INDIVIDUAL PLANT EXAMINATION ( IPE) SUBMITIAL - INTERNAL EVENTS CTAC NOS. M96178 AND M96179)
Dear Ms. Johnson:
On November 9. 1995. the NRC issued a staff evaluation regarding the Dresden Nuclear Power Station IPE report submitted on January 28. 1993.
The IPE was submitted in response to Generic Letter CGL) 88-20 and associated supplements.
In the letter and associated evaluation. the staff indicated that. based on its review. it was unable to conclude that the Dresden IPE submittal and associated documentation met the intent of GL 88-20.
In response to the staff letter. Commonwealth Edison Company CComEd. the licensee). by letter dated June 28. 1996. submitted a modified Dresden IPE to address the concerns raised by the staff.
In the modified IPE. the licensee estimated a core damage frequency CCDF) for Unit 2 of approximately 3E-6/reactor-year from internally initiated events and internal floods.
For Unit 3. the estimated CDF for internal initiated events and internal floods is estimated to be 5E-6/reactor-year.
The licensee made several revisions in its IPE analysis addressing the concerns raised by the NRC staff.
In addition. the licensee made hardware and procedural improvements during the revisions of the IPE to further reduce the CDF for Dresden. Units 2 and 3.
Based on the enclosed evaluation of the Dresden Modified IPE. the NRC staff concludes that the Dresden IPE meets the intent of GL 88-20.
Docket. Nos. 50-237 and 50-249
Enclosure:
Staff Evaluation Sincerely, ORIGINAL SIGNED BY:
John F. Stang, Senior Project Manager Project Directorate III-2 Division of Reactor Projects - III/IV Office of Nuclear Reactor Regulation DISTRIBUTION:
, Docket Fil es *
- RCapra PHiland. RIII WKropp. RIII DOCUMENT NAME: G: [MNTJR\\DRESDEN\\DR96178.IPE document, indicate in the box: "C" = Copy without enclosures "E" = Copy with enclosures "N" = No copy OFFICE NAME DATE 9710100113 971002 PDR ADOCK 05000237 P
<2_., 1D: PD I II -
- JR CAPRA
- -q FHHA RE ORD COPY JL[£ rf [~MJ1Y!Bi;l rGlf '\\1ff JW I l!llll !1111 !1111 !1111!1111!1111 jlll l!ll
~ October 2, 1997 Ms. Irene Johnson. Acting Manager Nuclear Regulatory Services
- Commonwealth Edison Company Executive Towers West III 1400 Opus Place. Suite 500 Downers Grove. IL 60515
SUBJECT:
DRESDEN. UNITS 2 AND 3, MODIFIED AND UPDATED INDIVIDUAL PLANT EXAMINATION (IPE) SUBMITTAL - INTERNAL EVENTS (TAC NOS. M96178 AND M96179)
Dear Ms. Johnson:
On November 9. 1995. the NRC issued a staff evaluation regarding the Dresden Nuclear Power Station IPE report submitted on January 28. 1993. The IPE was submitted in response to Generic Letter (GL) 88-20 and associated supplements.
In the letter and associated evaluation. the staff indicated that. based on its review. it was unable to conclude that the Dresden IPE submittal and associated documentation met the intent of GL 88-20.
In response to the staff letter. Commonwealth Edison Company (ComEd. the licensee). by letter dated June 28. 1996. submitted a modified Dresden IPE to address the concerns raised by the staff.
In the modified IPE. the licensee estimated a core damage frequency (CDF) for Unit 2 of approximately 3E-6/reactor-year from internally initiated events and internal floods.
For Unit 3. the.estimated CDF for internal initiated events and internal floods is estimated to be 5E-6/reactor-year.
The licensee made several revisions in its IPE analysis addressing the concerns raised by the NRC staff.
In addition. the licensee made hardware and procedural improvements during the revisions of the IPE to further reduce the CDF for Dresden. Units 2 and 3.
Based on the enclosed evaluation of the Dresden Modified IPE. the NRC staff concludes that the Dresden IPE meets the intent of GL 88-20.
Sincerely, ORIGINAL SIGNED BY:
John F. Stang, Senior Project Manager Project Directorate III-2 Division of Reactor Projects - III/IV Office of Nuclear Reactor Regulation Docket Nos. 50-237 and 50-249 DISTRIBUTION:
Docket Files
Enclosure:
Staff Evaluation PDIII-2 r/f EAdensam. EGAl cc w/encl: see next page ACRS. T2E26 PUBLIC RCapra
- PHi land. RI II WKropp, RIII OGC JS tang CMoore DOCUMENT NAME: G:
MNTJR\\DRESDEN\\DR96178.IPE ocument, indicate in the box: "C" = Copy without enclosures "E" = Copy with enclosures "N" = No copy NAME DATE
1-UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555--0001 October 2, 1997 Ms. Irene Johnson. Acting Manager Nuclear Regulatory Services Commonwealth Edison Company Executive Towers West III 1400 Opus Place. Suite 500 Downers Grove. IL 60515
SUBJECT:
DRESDEN. UNITS 2 AND 3. MODIFIED AND UPDATED INDIVIDUAL PLANT EXAMINATION (IPE) SUBMITTAL - INTERNAL EVENTS (TAC NOS. M96178 AND M96179)
Dear Ms. Johnson:
On November 9. 1995. the NRC issued a staff evaluation regarding the Dresden Nuclear Power Station IPE report submitted on January 28. 1993.
The IPE was submitted in response to Generic Letter (GL) 88-20 and associated supplements.
In the letter and associated evaluation. the staff indicated that. based on its review. it was unable to conclude that the Dresden IPE submittal and associated documentation met the intent of GL 88-20.
In response to the staff letter. Commonwealth Edison Company (ComEd. the licensee). by letter dated June 28. 1996, submitted a modified Dresden IPE to address the concerns raised by the staff.
In the modified IPE. the licensee estimated a core damage frequency CCDF) for Unit 2 of approximately 3E-6/reactor-year from internally initiated events and internal floods.
For Unit 3. the estimated CDF for internal initiated events and internal floods is estimated to be 5E-6/reactor-year.
The licensee made several revisions in its IPE analysis addressing the concerns raised by the NRC staff. In addition. the licensee made hardware and procedural improvements during the revisions of the IPE to further reduce the CDF for Dresden. Units 2 and 3.
Based on the enclosed evaluation of the Dresden Modified IPE. the NRC staff concludes that the Dresden IPE meets the intent of GL 88-20.
Docket Nos. 50-237 and 50-249
Enclosure:
Staff Evaluation cc w/encl: See next page Sincerely,
~~~Senior Project Manager Project Directorate III-2 Division of Reactor Projects - III/IV Office of Nuclear Reactor Regulation r-
-* -~*-
- - --------**-**----------~--~---------------*-**---~-------..... -----**
I. Johnson Commonwealth Edison Company cc:
Michael I. Miller, Esquire Sidley and Austin One First National Plaza Chicago, Illinois. 60603 Site Vice President Dresden Nuclear Power Station 6500 North Dresden Road Morris, Illinois 60450~9765 Station Manager Dresden Nuclear Power Station 6500 North Dresden Road Morris, Illinois 60450-9765 U.S. Nuclear Regulatory Commission Resident Inspectors Office Dresden Station 6500 North Dresden Road Morris, Illinois 60450-9766 Regional Administrator U.S. NRC, Region III 801 Warrenville Road Lisle, Illinois 60532-4351 Illinois Department of Nuclear Safety Office of Nuclear Facility Safety 1035 Outer Park Drive Springfield, Illinois 62704 Chairman Grundy County Board Administration Building 1320 Union Street Morris, Illinois 60450 Document Control Desk-Licensing Commonwealth Edison Company 1400 Opus Place, Suite.400 Downers Grove, Illinois 60515 Dresden Nuclear Power Station Unit Nos. 2 and 3