ML20132E338
| ML20132E338 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 09/26/1985 |
| From: | Noonan V NRC - COMANCHE PEAK PROJECT (TECHNICAL REVIEW TEAM) |
| To: | Ellis J Citizens Association for Sound Energy |
| References | |
| NUDOCS 8510010063 | |
| Download: ML20132E338 (7) | |
Text
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/ m'o, O'NITED STATES
^t NUCLEAR REGULATORY COMMISSION Y
U E
WASHINGTON, D. C. 20555 IEP 2 8 g Docket Nos.:
50-445 50-446 Mrs. Juanita Ellis, President Citizens Association for Sound Energy 1426 South. Polk Street Dallas, Texas 75224
Dear Mrs. Ellis:
I am writing you to respond to 2 questions that you raised in our February 1, 1985 telephone conversation. The questions you asked involved a reactor coolant pump motor ~ failure and cutting of the spent fuel pool liner at Comanche PeakSteamElectricStation(CPSES).
I have asked the Region IV staff to look into these questions and provide answers. They have completed their review of the two areas and the following facts have been reported to me:
On October 28, 1984, while filling and venting the Unit 1 Reactor Coolant, (RC)
System, the No. 4 RC pump motor tripped due to a phase A and B over-current condition. This overcurrent condition was apparently caused by a stator winding insulation breakdown. A piece of metal resembling a washer could have caused the insulation breakdown. The puinp motor failure was considered by the Applicant to be an isolated incident on a non-safety related component.
I understand that this motor failure was discussed with you durin'g a meeting at the Dallas Fort Worth Airport Hilton Hotel on November 7, 1984.
The second reactor coolant pump failure you mentioned did not involve the coolant pump motor, but was a seal leak on the No. 2 reactor coolant pump shaft seal assembly. During the plant cooldown that followed the hot plant tests conducted in November and December 1984, an operator observed excessive leakage coming from a seal. Upon disassembly and inspection of all 3 seals on No. 2 RC pump, the Applicant noted a degradation of the " double Delta seals." The Applicant checked the seal ring assemblies on all RC pumps for similar problems and is investigating the cause with assistance from the pump seal vendor. The NRC Resident Inspectors are following this problem to insure that the corrective actions are adequate.
You also mentioned to me that you heard that the Applicant was cutting spent fuel pool liners for the purpose of examining the concrete. Your understanding of this matter is correct.
In August of 1982, the Applicant's personnel made preparations to pour the concrete annulus around the reactor vessel for Unit 2.
On removing the expanded metal frame work from the reactor side of compartment concrete walls, a void in the concrete at the bottom of the stainless steel liner wall for compartments I and 4 was observed. The Applicant documented this void on NCR C-82-01202. The repair of the identified void required 8510010063 850926 PDR ADOCK 05000445 S
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j i removal of a portion of the stainless steel liner; therefore, final disposition of NCR C-82-01202 was delayed until the completion of construction activities for Unit 1.
During late 1984, the Applicant's resources were then made available to accomplish the work related to the concrete void.
To fully evaluate the extent of voids and confirm repairs, 3 areas of the liner were removed and concrete excavated by Applicant's personnel. To assure full definition of the suspect area, a grid pattern of li-inch diameter probe holes and grout holes was used. The Applicant reviewed the grid pattern results and compared the grid pattern results in compartments 2 and 3 to compartments 1 and 4.
The Applicant's reviews indicated that the voids do not exist in compartments 2 and 3.
The repair procedure (DCA-20856) required that the total extent of the concretq voids be. determined and repairs be made f o the identified concrete voids.
Twenty five bags of grout (i cubic yard) were used to make the repairs. The
' repairs are documented on grout card 261. The DCA indicates that the voids were not extensive ('28 square feet by 8 inches maximum depth). The Applicant states that its repair procedure indicated that the total extent of the voids have been discovered.. Repair was accomplished as directed by DCA-20856, Revision 1.
The stainless steel liner plates had been reinstalled. The Comanche Peak Project staff is also reviewing the technical aspects of this matter and will report the results of its review when completed. As we discussed, Dr. Shao has responsibility for this matter.
I trust that this letter has answered your questions.
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6f or Comanche P ak Qoject cc:
L. Shao
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W. G. Ccunsil Comanche Peak Steam Electric Station Texas Utilities Generating Company Units 1 and 2 cc:
Nicholas S. Reynolds. Esq.
Resident Inspector /Comimche Peak Bishop. Libeman, Cook, Nuclear Power Station Purcell & Reynolds c/o U.S. Nuclear Regulatory. Comission 1200 Seventeenth Street, NW P. O. Box 38 Washington, D.C.
20036 Glen Rose Texas 76043 Robert A. Wooldridge, Esq.
Regional Administrator, Region.IV Worsham, Forsythe, Sampels &
U.S. Nuclear Regulatory Comission Wooldridge 611 Ryan Plaza Drive Suite 1000 2001 Bryan Tower, Suite 2500 Arlington, Texas 76011 Dallas, Texas 75201 Mr. Homer C. Schmidt Larry A. Sinkin
' Manager - Nuclear Services 3022 Porter Street, NW #304 Texas Utilities Generating Company Washington, D.C.
20008 Skyway Tower 400 North Olive Street, L.B. 81 Dallas, Texas 75201 Mr. Robert E. Ballard, Jr.
Ms. Billie Pirner Garde Director of Projects Citizens Clinic Director
.Gibbs and Hill, Inc.
Government Accountability Project 11 Pen Plaza 1901 Que Street, NW New York, New York 10001 Washington, D.C.
20009 David R. Pigott, Esq.
Mr. A. T. Parker Orrick, Herrington & Sutcliffe Westinghouse Electric Corporation 600 Montgomery Street P. O. Box 355 San Francisco, California 94111 Pittsburgh, Pennsylvania 15230 Anthony Z. Roisman, Esq.
Renea Hicks, Esq.
Trial Lawyers for Public Justice Assistant Attorney General 2000 P. Street, NW Environmental Protection Division Suite 611 P. O. Box 12548, Capitol Station Washington, D.C.
20036 Austin, Texas 78711 Nancy E. Wiegers Mrs. Juanita Ellis, President Spiegel & McDianned Citizens Association for Sound Energy 1350 New York Avenue, NW 1426 South Polk Washington, D.C.
20005-4798 Dallas, Texas 75224 Ms. Nancy H. Williams CYGNA 101 California Street San Francisco, California 94111
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Texas Utilities Electric Company Comanche Peak Electric Station Units I and 2 cc:
Resident Inspector - Comanche Peak c/o U.S. Nuclear Regulatory Commission P. O. Box 1029 Granbury. Texas 76048 Mr. donn m. Beck Manager - Licensing Texas Utilities Electric Company Skyway Tower 400 N. Olive Street, LBf81 Dallas, Texas 75201 Mr. Jack Redding Licensing Texas Utilities Generating Company
~4901 Fairmont Avenue Bethesda, Maryland 20814 William A. Burchette, Esq.
Her un, Co,ciacite, Ruckert & Rothwell Suite 700 1025 Thomas Jefferson Street, NW Washington, D.C.
20007 Mr. James McGaughy Southern Engineering Company of Georgia 1800 Peachtree Street. NW Atlanta, Georgia 30367-8301 9
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IB#1 Reading File Project Manager M. Rushbrook Attorney.OEED j
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L. Shao S. Buzwell V. Noonan 4
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removal of a portion of the stainless steel liner; therefore, final disposition of NCR C-82 01202 was delayed until the completion of construction activities for Unit 1.
During late 1984, the Applicant's resources were then made available to accomplish the work related to the concrete void.
To fully evaluate the extent of voids and confirm repairs, 3 areas of the liner were removed and concrete excavated by Applicant's personnel. To assure full definition of the suspect area, a grid pattern of 11-inch diameter probe holes and grout holes was used. The Applicant reviewed the grid pattern results and compared the grid pattern results in compartments 2 and 3 to compartments 1 and 4.
The Applicant's reviews indicated that the voids do not exist in compartments 2 and 3.
The repair procedure (DCA-20856) required that the total extent of the concrete voids be determined and repairs be~made to the identified concrete voids.
Twenty five bags of grout (3 cubic yard) were used to make the repairs. The repairs are documented on grout card 261. The DCA indicates that the voids were not extensive ( 28 square feet by 8 inches maximum depth). The Applicant states that its repair procedure indicated that the total extent of the voids have been discovered. Repair was accomplished as directed by DCA-20856, Revision 1.
The stainless steel liner plates had been reinstalled. The Comanche Peak Project staff is also reviewing the technical aspects of this matter and will report the results of its review when completed. As we discussed, Dr. Shao has responsibility for this matter.
I trust that this letter has answered your questions.
Vincent S. Noonan, Director Comanche Peak Project cc:
L. Shao
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To fully evaluate the extent of voids and confirm repairs, 3 areas of.-the s
liner were remove (and concrete excavated by Applicants personnel./To assure full definition of th( suspect area, a grid pattern of 11-inch _dfameter probe holes and grout holes das used. The Applicants reviewed the grid pattern results and compared the gr(e pattern results in compartments 2 and 3 to d
l compartments 1 and 4.
Thes views indicated that the voids do not exist in compartments 2 and 3.
t The repair procedure (DCA_20856) required that the total extent of the concrete voids be detemined and repaifs be.made to the. identified concrete s
voids. Twenty five bags of grout (i cubicsy.ard) were used to make the repairs. The repairs are documented on' grout' card 261.
The DCA indicates that the voids were not extensive ( 28 square fAet by 8 inches maximum depth). The repair procedure indicated that the total extent of the voids have been discovered. Repair w'as accomplished as dir'stted by DCA-20856, Revision 1.
The stainless, steel liner plates had been reinstalled.
I trust that this lette'r as ansyered your questions.
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