ML17201Q378
| ML17201Q378 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Quad Cities, LaSalle, 05000000 |
| Issue date: | 03/01/1989 |
| From: | Muller D Office of Nuclear Reactor Regulation |
| To: | Bliss H COMMONWEALTH EDISON CO. |
| References | |
| TAC-59862, TAC-59863, TAC-61171, TAC-61172, TAC-61218, TAC-61219, NUDOCS 8903210119 | |
| Download: ML17201Q378 (6) | |
Text
- ,
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 March 1, 1989 Docket Nos. 50-237, 249, 254, 265, 373 and 374 Mr. Henry E. Bliss Nuclear Licensing Manager Comnonwealth Edison. Company Post Office Box 767
.Chicago, Illinois 60690
SUBJECT:
ASME CODE CASE N-411 ALTERNATIVE DAMPING VALUES FOR SEISMIC ANALYSIS OF CLASSES 1, 2 AND 3 PIPING (TAC NOS. 61171, 61172, 61218 AND 61219)
ALTERNATE SEISMIC EVALUATION CRITERIA (TAC NOS. 59862 AND 59863)
RE:
(a) Letter from J. R. Wojnarowski to H. R. Denton, dated September 30, 1985.
(b) Letter from J. R. Wojnarowski to H. R. Denton, dated April 1, 1986.
( c) Letter from E. G. Adensam to D. L. Farrar, dated April 1, 1986.
(d)
Letter from J. R. Wojnarowski to H. R. Denton, dated April 7, 1986.
(e) Letter from J. R. Wojnarowski to H. R. Denton, dated April 11, 1986.
Th~ purpose of this letter is to provide an update of the staff's current position with regard to the acceptabi'lity of the use of ASME Code Case N-411 alternative damping values for seismic analyses of Class 1, 2 and 3 piping and the use of alternate seismic evaluation criteria and methodology.
ASME Code Case N-411 Alternative Damping Values Over the last few years ASME Code Case N-411 damping values have been used by the nuclear power industry for.new analyses, r~conciliation work, or support optimization of piping systems. These damping values were recommended by the Pressure Vessel Research Committee {PVRC) as an alternate to the Regulatory Guide 1.61 damping values.
Volume 5 of NUREG-1061, "Report of the U.S. Nuclear Regulatory Conunission Piping Review Conunittee," published in April 1985 also reconunended the use of these alternative damping values.
The adequacy of N-411 damping values has been a subject of NRR internal discussions. The application of this Code Case had never formally been endorsed by the staff until the issuance of Regulatory Guide 1.84 Rev. 24, in June 1986. This endorsement represents the current staff position on the use of these dampi,ng values. It is noted, however, that a number of conditions are specified in this Regulatory Guide which should be satisfied in order for 8903210119 890301 u*
P[1R Ar1r_1L~~-*
ne1*1c1c~-7 r-
... I' P
PDC I
.11 'f.'I
--=~:-:._-~-~
~ro\\
'\\0
_-_**~~
-~
_.;._~- -_:
March 1, 1989
- Henry the use of these damping values to be *considered acceptable. These conditions exceed the interim requirements established earlier by the staff (See References (c), (d), and (e)) as follows:
(1)
(2)
- , ( 3)
(4)
The response mode frequencies of the piping system are limited to 33 H and below; C~rrent seismic spectra* are used; Supports designed to dissipate energy are not used; and Piping with incipient stress corrosion cracking is not considered.
Deviations.from the above Regulatory, Guide conditions are not acceptable to the staff without a detailed *case-*specific* evaluation. This is taken as a ___,_
- . current generic staff *position on the use of Code Case N-411 damping values, bot_h for short-term as well as* long-term evaluations of piping systems.
For LaSalle 1 *and 2, Dresden 2 and 3, and Quad Cities 1 and 2, Code Case N-411 was used for a limited scope rif applications, such as recirculation piping and supports (see ~eferen~es (b), (~), and (d)). Interim staff concurrences for. continued operation.. w.,ere bas~d on the information. available at the time, without the benefit, of.Regulatory Guide 1.84. Since this Code* case has been endorsed. by the staff,' with.the. issuance of Regulatory Guide 1.84, CECo should now re--eva'luate these applicatioris for, 'lor1g-term operation so *these open issues ori the use.of *al't;ernative dampi'ng values can be closed. Within 30 days of rec~ipt of this-letter,* a::schedu.*le for comp let ion of.this re-evaluation shoUld'be_pro!ided fo~ each of *the affected plants.
- *
- Alternat~ Sei~mi~ Eval~ation Criteria
~* '
J The Ores.den/Quad Cities alternate *~eismic.evaluati.on criteria and methodology
- as stated in Reference (a) has: not.been actively reviewed by.the staff largely due to lack* of staff resources. *Before completion of the review of these criteria by. the staff, CECo should not use.these criteria for any
- pi.ping/supp'ort re-ev.aluations.
- If you have any questions regarding the contents of this letter, please contact the appropriate Project,Manager for*each of the plants ~nvolved.
cc:
See next page DIST_RIBUIION '* I co_ocket-f-1-le* -,__,1 NRC & Local PDRs BSiegel ACRS (10)
PDIII-2:LA_.-i.-1 ~
LLuther:d~r 31J I /89 GHolahan Lluther BGri'mes MVirgil io Daniel R. Muller, Director Project Directorat~ III-2 Division of Reactor Projects - III, IV,* V and Special Projects OGC EJordan DMuller PSh~manski
- Alee PDilI-2 r/f TRoss Plant file
, r!! f.J. fol--
PDIII-.:P PDIII-2:PM BSiegel TRoss 31./ I /89 3S/ J /89.
- f. r.
POii I-2 :PM PShemanski 3t/ I /89 f.f. rtl PDII I-2: PD DMuller
~11 / /89
_....::=::..:;:~=-
~. **-::::.._*_ : __
-~-.::-=*-~*-
- .;_~ '
- :':....--.
..:.--~--==-
~=--*-,_:-=--
Henry the *use of these damping values to be considered acceptable. These conditions exceed the foterim requirements established earlier by the staff (See References (c), (d), and (e)) as follows:
(1) The response mode frequencies of the piping system are limited to 33 H and below; (2) c6rrent seismic spectra are used; (3) Supports designed to dissipate energy are not used; and (4) Piping with incipient stress corrosion cracking is not considered.
Deviations from the above Regulatory Guide conditions are not acceptable to the staff without a detailed case-specific evaluation. This is taken as a current generic staff position on the use of Code Case N-411 damping values, both for short-term as well as long term-evaluations of piping systems.
For LaSalle 1 and 2, Dresden 2 and 3, and Quad Cities 1 and 2, Code Case N-411 was used for a limited scope of applications, such as recirculation piping and supports (see References (b), (c), and (d)). Interim staff concurrences for continued operation were based on the information available at the time, without the benefit of Regulatory Guide 1.84. Since this Code Case has been endorsed by the staff, with the issuance of Regulatory Guide 1.84, CECo should now re-evaluate these applications for long-term operation so these open issues on the use of alternative damping values can be closed. Within 30 days of receipt of this letter, a schedule for completion of this re-evaluation should be provided for each of the affected plants *
. -Alternate Seismic Evaluation Criteria The Dresden/Quad Cities alternate seismic evaluation criteria and methodology as stated in Reference (a) has not been actively reviewed by the staff largely due to lack of staff resources. Before completion of the review of these criteria by the staff, CECo should not use these criteria for any piping/support re-evaluations.
If you have any questions regarding the contents of this letter, please contact the appropriate Project Manager for each of the plants involved.
cc: See next page r\\)J c. s-~
f"c>~
Daniel R. Muller, Director Project Directorate IH-2 Division of Reactor Projects - III, IV, V and Special Projects
Mr. Henry E. Bliss Co1T1110nwealth Edison Company cc:
Michael I. Miller, Esq.
Sidley and Austin One First National Plaza Chicago, Illinois 60603 Mr. J. Eenigenburg Plant Superintendent Dresden Nuclear Power Station Rural Route #1 Morris, Illinois 60450 U. S. Nuclear Regulatory CoR111ission Resident Inspectors Office Dresden Station Rural Route #1 Morris, Illinois 60450 Chainnan Board of Supervisors of Grundy County
.- Grundy County Courthouse Morris~ Illinois 60450 Regional Admini~trator Nuclear Regulatory CoR111ission, Region III 799 Roosevelt Road, Bldg. #4 Glen Ellyn, Illinois 60137 Mr. Michael E. Parker, Chief Division of Engine~ring Illinois Department of Nuclear Safety 1035 Outer Park Drive, 5th Floor Springfield, Illinois 62704 Dresden Nuclear Power Station Units 2 and 3
_::...:_::"-=--
..:::=-*~-=-=-*-
.-*:*~-----~-*
Mr. Henry E. Bliss Commonwealth Edison Company cc:
Mr. Stephen E. Shelton Vice President Iowa-Illinois Gas and Electric Company P. O. Box 4350 Davenport, Iowa 52808 Michael I. Miller, Esq.
Sidley and Austin One First National Plaza Chicago, Illinois 60603 Mr. Richard Bax Station Manager Quad Cities Nuclear Power Station 22710 206th Avenue North Cordova, Illinois 61242 Resident Inspector U. s. Nuclear Regulatory Commission 22712 206th Avenue North Cordova, Illinois 61242 Chairman Rock Is land CouAty Boar*d of Supervisors 1504 3rd Avenue Rock Island County Office Bldg.
Rock Island, Illinois 61201 Mr. Michael E. Parker, Chief Division of Engineering Illinois Department of Nuclear Safety 1035 Outer Park Drive, Sprin~field, Illinois 62704 Regional Administrator, Region III U. S. Nuclear Regulatory Commission 799 Roosevelt Road, Bldg. #4 Glen Ellyn, Illinois 60137 Quad Cities Nuclear Power Station Units 1 and 2
~- - -. : -.:. ~ - -
"'io ' '** **.*.,;.
f I
'j"'
Mr. Henry E. Bliss Commonwealth Edison Company cc:
Phillip P. Steptoe. Esquire Sidley and Austin One First National Plaza Chicago, Illinois 60603 Assistant Attorney General 100 West Randolph Street Suite 12 Chicago, Illinois 60601 Resident InspectQr/LaSalle, NPS U.S. Nuclear Regulatory Commission Rural Route No. 1 P. 0. Box 224 Marseilles, Illinois 61341 Chainnan LaSalle County Board of Supervisors LaSalle County Courthouse Ottawa, Illinois 61350 Attorney Genera 1 500 South 2nd Street
---*Springfield, Il\\inois 62701 Chairman Illinois Commerce Commission Leland Building 527 East Capitol Avenue Springfield, Illinois 62706 Mr. Michael C. Parker, Chief Division of Engineering Illinois Department of Nuclear Safety 1035 Outer Park Drive, 5th Floor Springfield, Illinois 62704 Regional Administrator, Region III U. S. Nuclear Regulatory Commission 799 Roosevelt Road, Bldg. #4 Glen Ellyn. Illinois 60137 LaSalle County Nuclear Power Station Units 1 & 2 John W. Mccaffrey Chief, Public Utilities Division SOIC 100 West Randolph Street Chicago, Illinois 60601
.... _,.