ML19327C097
| ML19327C097 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 11/09/1989 |
| From: | Charemagne Grimes Office of Nuclear Reactor Regulation |
| To: | William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| References | |
| NUDOCS 8911150269 | |
| Download: ML19327C097 (4) | |
Text
November 9, 1989
.s
' Docket No. 50-445 i
Mr. William J. Cahill, Jr.
Executive Vice President, Nuclear Texas Utilities Electric Company 400 North Olive Street, L.D. 81 Dallas, Texas 75201
Dear Mr. Cahill:
SUBJECT:
COMANCHC PEAK STEAM ELECTRIC STATION UNIT 1 - REQUEST FOR ADDITIONAL INFORMATION REGARDING THE BORG-WARNER CHECK VALVE SWING ARMS A public meeting was held on October 26, 1989 in Rockville, Maryland, to discuss the service water system check valve swing arm failure and the reliability of the other Borg-Warner check valve swing arms installed in Comanche Peak Unit 1.
As a result of this meeting the staff has determined 1
that additional information is needed as described in the enclosure to thic i
letter. Please provide your response as quickly as possible so that the
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,taff can conclude its review in a timely manner, j
Should you have any questions regarding this request please evntact either' ofourprojectmanagers,MelFieldsat(301)492-0765 or Melinda Malloy at(301)492-0738.
The reporting requirements contained in this letter affect fewer than ten j
respondents, therefore OMB clearance is not required under P. L.96-511.
Sincerely, Original signed by Christopher I. Grimes, Director Comanche Peak Project Division Office of Nuclear Reactor Regulation 1.
Enclosure:
Request for Additional Information ec: See next page DISTRIBUTION l
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WASHINGTON, D. C. 20065
.S November'9, 1989
>.i Docket No. 50-445 i
L l
Mr. William J. Cahill, Jr.
Executive Vice President, Nuclear Texas Utilities Electric Company 400 North Olive Street, L.B. 81 Dallas. Texas 75201
Dear Mr. Cahill:
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION UNIT 1 - REQUEST FOR L
ADDITIONAL INFORMATION REGARDING THE BORG-WARNER CHECK VALVE SWING ARMS c
l A public meeting was held on October 26,1989 in Rockville, Maryland, to discuss the service water system check valve swing arm failure and the reliability of the other Borg-Warner check valve swing arms installed in l.
Comanche Peak Unit 1.
As a result of this meeting the staff has determined that additional information is needed as described in the enclosure to this l
1etter. Please provide your response as quickly as possible so that the staff can conclude its review in a timely manner.
Should you have 'any questions regarding(301) 492-0765this requ a t please contac of our project managers, Mel Fields at or Melinda Malloy at(301)492-0738.
'The reporting requirements contained in this letter affect fewer than ten L.
respondents, therefore OMB clearance is not required under P. L.96-511.
Sincerely, y w N sh Christo
?. Grimes, Director Comanch Peak Project Division Office of Nuclear Reactor Regulation i
Enclo'sure:
Request for Additional Information cc:
See next page i
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Mr. W. J. Cahill, Jr. November 9, 1989 CC:
Mr. Robert F. Warnick Jack R. Newman, Esq.
1 Assistant Director Newman & Holtzinger i
for Inspection Programs 1615 L Street, NW Comanche Peak Project Division Suite 1000 i
U. S. Nuclear Regulatory Commission Washington, D.C.
20036 P. O. Box 1029 Granbury. Texas 76048 Chief, Texas Bureau of Radiation Control Texas Department of Health
. Regional Administrator, Region IV 1100 West 49th Street U. S. Nuclear Regulatory Comission Austin, Texas 78756 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 Honorable George Crump County Judge Ms. Billie Pirner Garde. Esq.
Glen Rose, Texas 76043 Robinson, Robinson, et al.
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 P. O. Box 1777 Glen Rose, Texas 76043 Mr. Roger D. Walker Manager, Nuclear Licensing 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.
CounselforTex-LaElectric 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
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1 REQUEST FOR ADDITIONAL INFORMATION COMANCHE PEAK STEAM ELECTRIC STATION UNIT 1 m
BORG-WARNER CHECK VALVE SWING ARMS t
(1) Additional tests and analyses are needed to support the applicant's position that the Borg-Warner check valve swing arms in Comanche Peak i
Unit 1 are acceptable.
Specifically, the staff recommends, for a L
statistically significant sample of. representative swing arms, the I
following:
(a) perform a 100% examination using wet flourescent magnetic particle testing (or an equivalent methoci that will detect the presence of any hot tears in tha swing arms) to verify the findings of the metallurgical replication technique used on the swing anas; (b) perform fracture toughness tests and residual tiress tests to verify the adequacy of the values used in the f racture mechanics analysis; and, (c) perform radiographic examinations for the detection of subsurface defects (as defined by applicable codes and standards).
(2) The field inspection of the swing arms included dye penetrant tests to screen for surface linear indications greater than 0.1 inches as established by the fracture machanics analysis.
The staff needs a better understandirig of the specifics of this analysis in order to make a conclusion on the acceptability of the 0.1 inch criterion.
Provide clarification / justification for the following items.
(a) The material toughness and residual stress values assumed in the fracture mechanics analysis.
(b) 'of the phenoE,e. in the analysis implies that a static representation The use of X na involved is adequate.
If the swing arm rnaterit.1 is strain rate sensitive, the K values in the fracture mechanics analysismustaccountforth{ Crate of loading associated with the design basis event.
(c) The results of the fracture mechanics analysis sho'vs that for certain size swing arms with an assumed K
= 20ksi Vin and under pipe break loading conditions, the allowade crack length is less than the 0.1 inch acceptance criterien used in the field inspection.
Provide a discussion of the implications of this result.
(3) Provide the details of the stress analysis and allowable stress values used. Also, provide the yield and ultimate stress values from the tensile tests.
(4) AMS 5398A, Rev. 7/15/61, Paragraph 6.5 states, " Castings shall not be repaired by plugging, welding, or other methods, without written permission from purc.haser." Did Borg-Warner authorize in writing weld repairing of the swing arms?
.