TXX-7059, Final Deficiency Rept CP-87-75 Re Contact Surface Temps for Epoxy Grouts.Initially Reported 870824.Engineering Became Responsible for Development of Insp for Epoxy Grouts. Condition Not Reportable Under 10CFR50.55(e)
| ML20237E718 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 12/23/1987 |
| From: | Counsil W, John Marshall TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| CP-87-75, TXX-7059, NUDOCS 8712290145 | |
| Download: ML20237E718 (3) | |
Text
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s Log # TXX-7059 M
File # 10110 2M 903.8 d
Ref. # 10CFR50.55(e) nlELECTRIC December 23, 1987 William G. Coumil Execu,ive Vice 14cnknt U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C.
20555
SUBJECT:
COMANCHEPEAKSTEAMELECTRICSTATION(CPSES)
DOCKET NOS. 50-445 AND 50-446 EP0XY GROUT TEMPERATURES SDAR: CP-87-75 (FINAL REPORT)
Gentlemen:
On August 24, 1987, we verbally notified your Mr. H. S. Phillips of contact surface temperatures that may not have been properly recorded prior to placement of epoxy type grouts. Specifically, manufacturers' technical data on contact surface or ambient temperature limitations for epoxy grout placements were not always available, and were not incorporated into the specification 2323-55-09, " Concrete," prior to Rev. 6, or. the applicable Quality Control (QC) Procedure QI-QP-11.0-12. " Inspection of Pressure Grouted Bases Plates and Equipment Bases," prior to Rev. 5.
After further evaluation we have determined that this condition is not reportable under the provisions of10CFR50.55(e). Our latest interim report, logged TXX-6942, was submitted on November 13, 1987.
This is our final report on this issue.
Stone and Webster (SWEC) has reviewed the manufacturers' requirements for epoxy grouts used at CPSES, when procedure QI-QP-11.0-12, Rev. O, 1, 2, 3 and 4 were in effect.
SWEC found that, although the QC procedure did not contain the ambient temperature limitation for Escoweld-7502 and contact surface temperature limitation for Ceilcote 6481 and 658N, the applicable construction procedure (CEl-25, " Grouting Pipe Support Wall and Ceiling," Rev. 0, 1, 2 and
- 3) indicated a minimum contact surface temperature for Ceilcote 658N, as well as a minimum ambient tem)erature for Escoweld-7502. Additionally, a review of Inspection Reports for the period when procedure QI-QP-11.0-12, Rev. 0-through 4 was in effect, indicates that despite the lack of a procedural requirement, inspection personnel usually documented temperature readings or referred to manufacturer's requirements and therefore were aware of temperature requirements associated with epoxy grout placements.
With the exception of one placement, the placements under review for the subject period utilized Construction Procedure CEI-25 which had the following specific temperature requirements for each type of epoxy grout used:
i 8712290145 871223 D
PDR ADOCK 05000445 S
DCD D Nonh Olive Street LB 81 Dallas, Texas 73201
i TXX-7059 December 23, 1987 Page 2 of 3 Ceilcote 6481 and 658N...... Minimum Contact Surface l
Temperature - 50 Degree F Escoweld 7502........... Minimum Ambient Temperature
= 60 Degree F The results of our evaluation are summarized as follows:
1.
Escoweld 7502: All Escoweld-7502 placements provided the actual temperature recording of the daily ambient temperature on the inspection report, and met the requirements of the manufacturer and revised specification 2323-SS-09, Rev. 6.
2.
Ceilcote 658N: With'the exception of the seven discussed below, all Ceilcote 65BN placements provided either the actual recording of the contact surface temperature or noted that the manufacturer's requirements were met on the inspection report.
Reference was made to Construction Procedure CEI-25 which indicated 50 degrees F as contact surface minimum temperature requirement.
There were seven placements for which this information was not provided.
For these seven placements, daily meteorological temperature records were reviewed and found to be above the minimum surface temperature requirements when'the placements were made.
When considered with the demonstrated awareness of minimum placement
{
i temperatures by construction and inspection personnel, adequate confidence j
is established that these placements are satisfactory. No corrective i
action is necessary for these placements.
- 3. 'Ceilcote 6481:
During the evaluation period, there was only one 31acement ifaife with Ceilcote 6481.
The inspection records indicated that tie manufacturer's requirement was met, and reference was made to construction Procedure CEI-22 " Diesel Generator Base Grouting," which required a minimum ambient temperature of 50 degree F as a working temperature for mixing the grout. When considered with the )reviously demonstrated awareness of minimum placement temperatures )y construction and inspection personnel, adequate confidence is established that this placement is sat is factory. No corrective action is necessary for this placement.
To prevent the reoccurrence of this condition, engineering has become responsible for the development of inspection attributes for epoxy grouts.
Specification 2323-SS-09 has been revised to include the contact surface temperature requirements in Appendix "B" of revision 6.
This appendix will be used as the inspection criteria for all future grout placements.
Therefore, QC Procedure QI-QP-11.0-12 has been deleted.
No further corrective action is required on this subject.
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rTXX-7059 December 23, 1987 Page 3 of 3 Records supporting the above conclusions are available for review by your inspectors at the CPSES plant site.
Very truly yours, h,(. boM G [
W. G. Counsil By:
J. S. Marshall i
Supervisor, 1
Generic Licensing CBC/mgt.
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c - Mr. R. D. Martin, Region IV Resident Inspectors, CPSES (3)
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