ML20042H027
| ML20042H027 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 05/15/1990 |
| From: | Charemagne Grimes Office of Nuclear Reactor Regulation |
| To: | William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| References | |
| IEB-88-011, IEB-88-11, NUDOCS 9005170083 | |
| Download: ML20042H027 (4) | |
Text
-.
e UNITED STATES
'j j'
NUCLEAR REGULATORY COMMISSION g.
W W ASHINGT ON, D. C. 20666 May 15, 1990 l
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Docket No. 50-445 t
Mr. William J. Cahill, Jr.
i Executive Vice President, Nuclear
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Texas Utilities Electric Company 400 North Olive Street, L.B. 81 i
Dallas, Texas.75201
~
Dear Mr. Cahill:
l
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION UNIT.1 -
1 PRESSURIZER SURGE LINE THERMAL STRATIFICATION ISSUE The staffs review of the Comanche Peak Unit 1 pressurizer surge line thermal stratification issue as related to NRC Bulletin 88-11 and the
" leak-before-break" methodology permitted by General Design Criterion 4 was documented in Supplement 23 to the Safety Evaluation Report-(NUREG-0797).
Since the issuance of Supplement 23, there have been instances at other PWRs where the temperature difference between the pressurizer and the hot leg exceeded the 320*F value utilized in the Westinghouse analysis (WCAP-12248).
Such oc-currences may invalidate the thermal stratification loads defined in WCAP-12248 and the conclusions contained in Supplement 23.
In order to assure that the Comanche Peak Unit 1 pressurizer surge line meets the requirements of General t
Design Criterion 4 and NRC Bulletin 88-11, you are requested to' provide resp ~onses by June 15, 1990 to the information requests detailed below.
1)
Describe the measures in place that will prevent the pressurizer-torhot leg temperature difference from exceeding the value assumed in WCAP-12248 during all modes of plant operation.
2)
If the 1ressurizer-to-hot leg temperature difference cannot be maintained below tie 320*F value used in WCAP 12248 at all times, provide an analysis of the effects of this potential excess on the thermal stratification loads defined in WCAP-12248 and verify continued compliance with Section III of the ASME Boiler and Pressure Vessel Code.
3)
The assumptions used in the " leak-before-break" analysis should be consistent with the assumptions used to show compliance with the ASME Section III Code.
The " leak-before-break" analysis should include the loading resulting from the combination of pressure, deadweight, thermal expansion (including thermal stratification with a differential temperature of 320*F), and safe. shutdown earthquake loads.
The corresponding leakage flaw size for this loading in the analysis should be based on " Case B" in Table 5-7 of WCAP-12248.
Should you have any questions regarding this request, please contact either of 4
our project managers, Mel Fields at (301) 492-0765 or Melinda Malloy at (301) 492-0738.
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4 Mr. '.W. J. Cahill, Jr..
G The reporting requirements contained in this letter affect fewer than ten respondants, therefore OMB clearance is not required under P. L.96-511.
Sincerely.
T Christop er I. Grimes, Director Comanche Peak Project Division Office of Nuclear Reactor Regulation ec:
See next page I
I i
4 i
t 4,I Mr. W. J. Cahill, Jr. '
cc:
Assistant Director Jack R. Newman, Esq.
for Ir.nection Programs Newman & Holtzinger i
Com echa ?eak Project Division 1615 L Street, NW U. S. huclear Regulatory Comission Suite 1000 P. 0. Box 1029 Washington, D.C.
20036 Granbury, Texas 76048 Chief, Texas Bureau of Radiation Control Regional Administrator, Region IV Texas Department of Health U. S. Nuclear Regulatory Comission 1100 West 49th Street 611 Ryan Plaza Drive, Suite 1000 Austin, Texas 78756
. Arlington, Texas 76011 l
Honorable George Crump l
Ms. Billie Pirner Garde, Esq.
County Judge j
Robinson, Robinson, et al.
Glen Rose, Texas 76043 103 East College Avenue Appleton, Wisconsin 54911 Mrs. Juanita Ellis, President Citizens Association for Sound Energy 1426 South Polk Dallas.. Texas 75224 E. F. Ottney l
P. O. Box 1777 l
Glen Rose, Texas 76043 l
Mr. Roger D. Walker Manager, Nuclear Licensing l
Texas Utilities Electric Company 400 North Olive Street, L. B. 81 Dallas, Texas 75201 Texas Utilities Electric Company c/o Bethesda Licensing 3 Metro Center, Suite 610 Bethesda, Maryland 20814 William A. Burchette, Esq.
Counsel for Tex-La Electric Cooperative of Texas Heron, Burchette, Ruckert & Rothwell 1025 Thomas Jefferson Street, NW Washington, D.C. 20007 GDS ASSOCIATES, INC.
Suite 720 1850 Parkway Place Marietta, Georgia 30067-8237 i
May 15, 1990
?
' Mr'. W. J. Cahill, Jr..
The reporting requirements contained in this letter affect fewer than ten respondants, therefore OMB clearance is not required under P. L.96-511.
Sincerely, (original signed by)
Christopher I. Grimes, Director ComanchePeakProjectDivision Office of Nuclear Reactor Regulation cc:
See next page
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DATE :05//s/90
- 05/f /90
- 05/4r/9
- 05/f/90 OFFICIAL RECORD COPY Document Name:
MEMO CAHILL
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