ML17187B135
| ML17187B135 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 09/30/1997 |
| From: | Stang J NRC (Affiliation Not Assigned) |
| To: | Johnson I COMMONWEALTH EDISON CO. |
| Shared Package | |
| ML17187B136 | List: |
| References | |
| TAC-M98187, TAC-M98188, NUDOCS 9710060079 | |
| Download: ML17187B135 (5) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 September 30, 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:
RESOLUTION OF INCONSISTENCY IN DESIGN BASIS DOCUMENTATION CONCERNING THE FRACTURE TOUGHNESS OF THE LOW PRESSURE COOLANT INJECTION AND CORE SPRAY PUMP CASINGS DRESDEN UNITS 2 AND 3 {TAC NOS. M98187 AND M98188)
Dear Ms. Johnson:
By letter dated February 18, 1997, Commonwealth Edison Company {ComEd, the licensee) submitted a letter describing an inconsistency discovered concerning the fracture toughness associated with the low pressure coolant injection
{LPCI) and core spray pump casings for Dresden, Units 2 and 3. The licensee discovered that the documentation and associated safety evaluations accepting the fracture toughness of the LPCI and core spray pump casings were based on a minimum system water temperature of 60 degrees Fahrenheit. The value of 60 degrees Fahrenheit was submitted to the NRC in a letter dated January 6, 1989.
The minimum design temperature listed *for the LPCI and core spray systems in the Updated Final Safety Analysis Report is 40 degrees Fahrenheit.
To resolve the issue, the licensee obtained the original plant design specification from General Electric {GE).
The documentation indicated that the minimum design temperature for the LPCI and core spray systems was 40 degrees Fahrenheit.
The licensee's February 18, 1997, letter provided justification for the fracture toughness of the LPCI and core spray pump casings with the minimum system water temperature of 40 degrees Fahrenheit.
The staff evaluated the licensee's justification. Enclosed is the staff's Safety Evaluation {SE).
Based of the staff's SE, it was determined that the ferritic materials in the LPCI and core spray pump casings need not be fracture toughness tested to later editions of the American Society of Mechanical Engineers {ASME) Boiler and Pressure Vessel Code {Code).
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In addition, the staff determined that with the LPCI and core spray system minimum system temperature of 40 degrees Fahrenheit, the LPCI and core spray pump casings have adequate fracture toughness.
Docket Nos. 50-237, 50-249
Enclosure:
SE cc w/encl:
see next page
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PDn1.::2 r/f E.. Adensam, EGAl R. Capra C. Moore J. Stang T.. Harris, TLH3 B. Elliot, EMCB -
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Sincerely, Original Signed By:
'John F. Stang, Project Manager Project Directorate III-2 Division of Reactor Projects - III/Iv*
Office of Nuclear Reacto_r Regulation
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In addition, the staff determined that* with the LPCI and core spray system minimum system temperature of 40 degrees Fahrenheit, the LPCI and core spray pump casings have adequate fracture toughness.
Docket Nos. 50-237, 50-249
Enclosure:
SE cc w/encl: see next page Distribution:
Docket File PUBLIC POI 11-2 r/f E. Adensam, EGAl R. Capra C. Moore J. Stang T. Harris, TLH3 B. Elliot, EMCB OGC, 015818 ACRS, T2E26 C. Mi 11 er, RI II Sincerely,
. Original Signed By:
John F. Stang, Project Manager Project Directorate 111-2 Division of Reactor Projects - Ill/IV Office of Nuclear Reactor Regulation To receive a llf* " Copy wfth enclosures -..* = No copy OFFICE D:PDIII-2 G
NAME RCAPRA p.v-DATE 09/ /97 OFFICIAL RECORD COPY.
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I In addition, the staff determined that with the LPCI and core spray system minimum system temperature of 40 degrees Fahrenheit, the LPCI and core spray pump casings have adequate fracture toughness.
Docket Nos. 50-237, 50-249
Enclosure:
SE cc w/encl:
see next page
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~. St~ject Manager Project Directorate 111-2 Division of Reactor Projects - Ill/IV Office of Nuclear Reactor Regulation
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 65.00 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