ML17187A673

Requests Addl Info Re 960920 Request for Proposed Amend to TS for Both Dresden Units 2 & 3 & Quad Cities,Units 1 & 2 to Update Pressure Temp Curves

ML17187A673
Person / Time
Site:	Dresden, Quad Cities
Issue date:	12/09/1996
From:	Stang J NRC (Affiliation Not Assigned)
To:	Johnson I COMMONWEALTH EDISON CO.
References
TAC-M96898, TAC-M96899, TAC-M96900, TAC-M96901, NUDOCS 9612120258
Download: ML17187A673 (5)

Text

• December 9, 1996 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:

REQUEST FOR ADDITIONAL INFORMATION (TAC NOS. M96898, M96g99, M96900 ANO M96901)

Dear Ms. Johnson:

In a letter dated September 20, 1996, Commonwealth Edison Company proposed amendments to the Technical Specifications for both Dresden, Units 2 and 3, and Quad Cities, Units 1 and 2, to update the Pressure Temperature (P-T) curves.

In order to complete our review of the proposed amendments, additional information is required.

Please provide a response to the enclosed Request for Additional Information (RAJ) within 30 days after receipt of this letter, to allow the staff adequate time to evaluate the proposed amendment requests and issue the amendments prior to February 20, 1997.

Any questions concerning this issue please contact me at (301) 415-1345.

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, 50~249, 50-254, 50-265

Enclosure:

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I. Johnson Conmonwealth 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 Horris, Illinois 60450-9765 U.S. Nuclear Regulatory Commission Resident Inspectors Office Dresden Station 6500 North Dresden Road Horris, Illinois 60450-9766 Richard J. Singer Manager - Nuclear MidAmerican Energy Company 907 Walnut Street P.O. Box 657 Des Moines, Iowa 50303 Brent E. Gale, Esq.

Vice President - Law and Regulatory Affairs MidAmerican Energy Company One RiverCenter Place 106 East Second Street P.O. Box 4350 Davenport, Iowa 52808 Chairman Rock Island County Board of Supervisors 1504 3rd Avenue Rock Island County Office Bldg.

Rock Island, Illinois 61201 Regional Administrator U.S. NRC, Region III 801 Warrenville Road Lisle, Illinois 60532-4351 Dresden Nuclear Power Station Unit Nos. 2 and 3 Quad Cities Nuclear Power Station Unit Nos. 1 and 2 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, 111 i noi s 60450 Mr. L. William Pearce Station Manager*

Quad Cities Nuclear Power Station 22710 206th Avenue North Cordova, Illinois 61242 U.S. Nuclear Regulatory Commission Quad Cities Resident Inspectors Office 22712 206th Avenue North Cordova, Illinois 61242 Document Control Desk-Licensing Conmonwealth Edison Company 1400 Opus Place, Suite 400 Downers Grove, Illinois 60515

~*:

REQUEST FOR ADDITIONAL INFORMATION CONCERNING THE PROPOSED AMENDMENTS ASSOCIATED WITH THE PRESSURE TEMPERATURE CURVES COMMONWEALTH EDISON COMPANY DRESDEN NUCLEAR POWER STATION. UNITS 2 AND 3. AND QUAD CITIES NUCLEAR POWER STATION, UNITS 1 AND 2 DOCKET NOS. 50-237, 50-249, 50-254 AND 50-265

1)

By teleconference conducted on November 26, 1996, the licensee indicated that there was no traceability of beltline welds fabricated using the electroslag process to specific weld wire heat numbers.

The electroslag welds in the Dresden, Units 2 and 3, and Quad Cities, Units 1 and 2, beltlines are id~ntified in the submittal dated September 20, 1996.

For all beltline welds fabricated using the electroslag welding process, identify the weld wire heat numbers and "PQ" numbers that could have been used to fabricate the welds.

2)

Provide the best-estimate percent copper for the beltline welds fabricated using the electroslag process using one of the following methods (per 10 CFR 50.61,(c)(l)(iv)(A)):

a) b)

c) d)

The best estimate is the mean of the measured values for a weld deposit made using the same weld wire heat number as the critical vessel weld, If these values are not available, upper limiting values given in the materials specification to which the vessel material was fabricated may be used, If not available, conservative estimates (mean plus one standard deviation based on generic data1) may be used if justification is

provided, If none of the above are available, 0.35% copper and 1.00% nickel may be used.

3)

If best-estimate chemistry is determined generically, explain the relationship between the information provided in Question 1 and the data used to determine the generic best-estimate chemistry values.

4)

Provide the neutron fluence (ID and l/4T locations) for 22 EFPY.

Also, provide the EFPY for each unit on January 1, 1997.

1Data from reactor vessels fabricated to the same material specification in the same shop as the vessel in question and in the same time period is an example of "generic data."

ENCLOSURE

5)

The following discrepancies exist when comparing the chemistry values in Tables C-1 through C-4 of the submittal to Attachment 8 of the Letter from M. A. Jackson (CECo) to T. E. Murley (USNRC},

Subject:

Dresden Station Units 2 and 3; Quad Cities Station Units 1 and 2; LaSalle County Station Units 1 and 2, July 1, 1992 (note: these discrepancies do not seem to result from updates due to any specific evaluations). For each of the following materials, provide the explanation for the chemistry values used in the submittal:

a}

Dresden 2 Lower Shell Plate Heat A9128-2:

the July 1, 1992, letter has Ni = 0.45, the current submittal has Ni = 0.55.

b}

Dresden 2 Lower Shell Plate Heat 83990-2:

the July 1, 1992, letter has Ni = 0.42, the current submittal has Ni = 0.51.

c)

Dresden 2 Lower Shell Plate Heat A9128-l:

the July 1, 1992, letter has Ni = 0.45, the current submittal has Ni = 0.55.

d)

Dresden 2 Lower Int. Shell Plate Heat 84065-1:

the July 1, 1992, letter has Ni = 0.52, the current submittal has Ni = 0.55.

e)

Dresden 2 Lower Int. Shell Plate Heat 84030-1*:

the July 1, 1992, letter has Ni = 0.55, the current submittal has Ni = 0.59.

f)

Dresden 2 Lower Int. Shell Plate Heat 84030-2:

the July 1, 1992, letter has Ni = 0.55, the current submittal has Ni = 0.58.

g)

Dresden 2 Lower Int. Shell Axial Welds Heat 1P0815:

the July 1, 1992, letter has Cu= 0.12, the current submittal has Cu= 0.17.

h)

Dresden 2 Lower Shell Axial Welds Heat 1P0815:

the July 1, 1992, letter has Cu = 0.25 and Ni = 0.48, the current submittal has Cu= 0.17 and Ni = 0.52.

i)

Dresden 2 Lower Int.flower Shell Circ. Weld Heat 71249:

the July 1, 1992, letter has Cu = 0.21, the current submittal has Cu = 0.26.

j}

Dresden 3 Lower Int.flower Shell Circ. Welds Heat 299L44:

the July 1, 1992, letter has Cu= 0.29 and Ni = 0.72, the current submittal has Cu = 0.35 and Ni = 0.68.

k)

Quad Cities 1 Lower Int.flower Shell Circ. Weld Heat 72445:

the July 1, 1992,.letter has Cu = 0.10, the current submittal has Cu = 0.21.

1)

Quad Cities 1 Lower Int.flower Shell Circ. Weld Heat 406L44:

the July 1, 1992, letter has Cu = 0.22, the current submittal has Cu= 0.31.

6)

It should be noted that Attachment B of the above mentioned July 1, 1992, letter from M. A. Jackson (CECo) to T. E. Murley (USNRC}, uses the weld procedure qualification number (i.e., PQ2563) as the designator for the heat ID.

• For Quad Cities 1, the letter lists additional ESW welds that Table C-3 in the submittal does not show.

In addition, the submittal does not associate heat IDs with the ESW welds for Dresden and Quad Cities. The additional beltline welds are identified as Lower and Lower Int. Axial Welds.

Verify whether or not these welds exist in the Quad Cities 1 beltline. If they do exist, provide the information requested iri Questions 1 and 2.

7)

Based on the response to the above questions, provide the adjusted reference temperature for the limiting materials in Dresden, Units 2 and 3, and Quad Cities, Units 1 and 2, at the expiration of the P-T

• limits. If.responses to the above questions result iri an adjusted reference temperature greater than that used in the P-T limits, provide revised P-T limits, or adjust the expiration of the proposed P~T limits accordingly.