ML20005B018
| ML20005B018 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 06/29/1981 |
| From: | Withers B PORTLAND GENERAL ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML20005B016 | List: |
| References | |
| NUDOCS 8107060223 | |
| Download: ML20005B018 (4) | |
Text
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PORTLAND GENERAL ELECTRIC COMPANY EUGENE WATER & ELECTRIC BOARD AND PACIFIC POWER & LIGHT COMPANY TROJAN NUCLEAR PLANT Operating License NPF-1 Docket 50-344 License Change Application 76 This License Change Application requests modification of Technical Specification 4.7.11.1 contained in Appendix A to Operating License hTF-1 in order to upgrade surveillance requirements for the Control Building connection bolts at the Trojan Nuclear Plant.
i PORTLAND GENERAL ELECTRIC COMPANY By Bart D. Withers Vice President Nuclear l
Subscribed and sworn to before me this c/fyh day of dd 1981.
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Notary Public of Oregon My Commission Expires:
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8107060223 81 ~
PDR ADOCK 050 4
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LCA 76 Page 1 of 3
-LICENSE CHANGE APPLICATION 76 The proposed replacement pages to Appendix A of Facility Operating License NPF-1 are provided as Attachment 1.
A description of these changes follows:
1.
Page 3/4 7-38.
Section 4.7.11.1, Paragraph (c) has revised the method of surveillance for the Ce ntrol Building through-wall bolts by requiring that a visual inspection of the bolts be made while the bolts are under tension. A more positive inspection of the through-wall bolts would be required by eliminating the in situ ultrasonic examination ard imposing a surface examination of the through-wall bolts, as well as examination for presence of grease and water content of the grease.
2.
Page 3/4 7-38.
Section 4.7.11.1, Paragraph (d) establishes an additional lower limit to the sample g
size for surface examination.
This additional sample minimum would be five percent of the total number of bolts required for sampling in Section 4.7.11.1, Paragraph (c).
REASON FOR CHANGE i
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The Control Building Modification described in the " Report on Design Modifications for the Trojan Control Building" (PGE-1020) involves connection of steel plates and new reinforced concrete to existing walls of the building by means of bolts.
Seismic resistance of the Control-i l
Auxiliary-Fuel Building Complex is dep'ndent upon the bolts' structural e
l adequacy and the proposed change in Surveillance Requirements improves the inservice inspection program to ensure the adequacy of these bolts.
Technical Specification 4.7.11.1 pertains to examination of Control Building through-wall bolts.
It was developed under the assumption that these bolts, under normal circumstances, would never be removed from the walls. Hence, ultrasonic inspection is the means by which structural integrity of the through-bolts was to be determined. As a result of a change to the Control Building Modifications Program, the through-wall bolts are to be greased and removable.
This revision to the Surveillance Requirements establishen a more positive examination of the through-wall bolts than presently required by the Technical Specifications.
The proposed inspection would consist of a surface examination and a verifi-cation of the bolt grease for both presence and water content. Presently, the specification requires bolt inspections by ultrasonic examination techniques which are difficult to interpret and may not detect some types of bolt degradation.
SAFETY / ENVIRONMENTAL EVALUATION Summary of Change 1
The Surveillance Requirement concerning Control Building through-wall bolts are revised by specifying the removal and examination of ten
LCA 76 Psge 2 of 3 percent of the total bolts instead of an in situ ultrasonic test inspec-tion.
In addition, the minimum sample size for inspected through-wall bolts is established at five percent of that required by Paragraph (c) if the acceptance criteria of Paragraphs (b) and (c) is met during the first four inspections.
Ef fect on Technical Specifications Including Design Basea Section 4.7.11.1 of the Technical Specifications is affected as described in the Summary of Change and shown in Attachment 1.
In addition, this revision poten** 1.y af fects Section 4.7.6.1, Paragraph (d)(3) which requires the ability to achieve a positive pressure of > 1/8 inch W.C.
relative to the outside atmosphere during ventilation system operation.
Ensuring roepliance with this will require a procedure to use plugs in the bolt holes when any Control Room through wall bolts are removed for inspection. The Surveillance Procedure for Technical Specification 4.7.11.1 will include provisions for plugs similar to those used during modifica-tion construction of the Control Building Complex.
Observance of normal precautions and limitations for working in the areas where surveillance is performed will ensure that the revised Surveillance Requirement will not result in:
1.
An increase in the occurrence probability of aa accident or malfunction of safety-related equipment previously
, analyzed in the FSAR; 2.
An increase in the consequences of an accident or mal-function of safety-related equipment previously analyzed in the FSAR; 3.
The possibility of a different type of accident or malfunction of safety-related equipment from that previously analyzed in the FSAR; 4.
A reduction in the margin of safety as defined in the bases of the Appendix A Technical Specifications; 5.
Any impact on environmental analyses of the Plant as
[
contained in the FSAR.
l Effect on FSAR The present text cf the FSAR is not af fected by the changes to the Technical Specifications; however, the FSAR will be amended in the future to incorporate pertinent information.
Environmental Effects The proposed change will not af fect ef fluent types or alter any discharge limits.
No unreviewed environmental matter exists, and there will be no significant impact to the environment from this change.
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LCA 76 Psga 3 of 3 BASIS FOR DETERMINATION OF AMENDMENT CLASS
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This License Change Application has been determined to result in a Class III amendment in accordance with the criteria-of 10 CFR 170.22 since it involves a single issue with no significant hazards considerations.
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