ML20199D767

Safety Evaluation Granting Relief from ASME Code Section XI Inservice Exam Requirements Re Hydrostatic Testing of Pressurizer Safety Valve Seal Water Drain Line

ML20199D767
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	03/17/1986
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML20199D765	List: ML20199D762 ML20199D767
References
TAC-60039, NUDOCS 8603240344
Download: ML20199D767 (3)

Text

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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO REQUEST FOR RELIEF FROM INSERVICE EXAMINATION REQUIREMENTS PORTLAND GENERAL ELECTRIC COMPANY THE CITY OF EUGENE, OREGON PACIFIC POWER AND LIGHT COMPANY TROJAN NUCLEAR PLANT DOCKET NO. 50-344 INTRODUCTION By letter dated October 3, 1985, Portland General Electric Company (the licensee) requested relief from certain inservice examination requirements of the 1974 Edition through Summer 1975 Addenda of Section XI of the ASME Code for Trojan. This report provides an evaluation of the licensee's request, supporting information, and alternative examinations or tests, as well as the staff's bases for granting or denying the requests pursuant to 10 CFR 50.55a(g). The relief request is evaluated below.

DISCUSSION A. Code Requirement Class 2 components shall be hydrostatically tested in accordance with IWA-4210 and IWC-2510.

B. Code Relief Request The licensee requests relief from the requirement to perform a pressure test on the pressurizer safety valve seal water drain line (3/4",-RC-2501R-12) between the first- and second-off isolation valves (8064A, B, and C and 8093).

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C. Proposed Alternative Examination Following repa_ir'or replacement, dye penetrant and visual examinations will be performed to ensure structural integrity.

D. L.icensee Basis for Relief The pressurizer safety valve seal water drain line is 3/4-in. nominal pipe c size and the requirement to perforn a hydrostatic test of piping 1 in. and less nominal pipe size has been' deleted frem later editions of the Code.

The piping is not equipped with a test connection. As a result, that portion of piping would have to be tested with the entire system to which it is connected at the hydrostatic test pressure (a Class 2 portion of the Reactor Coolant System designed for 2485 psig would have to be tested at 3107 psig tomeet.theCoderequirement). The piping both upstream and downstream of the subject section of piping cannot be tested to 3107 psig because of design and Code limitations.

A 3/8-in.1.D. flow restriction orifice is installed in the pressurizer safety valve seal water drain line at the Class 1 to Class 2 boundary.

This orifice limits break flow from the Reactor Coolant System to that assumed in the safety analyses. Therefore,. failure of this line does

.,not constitute an unreviewed safety question.

_ EVALUATION AND CONCLUSION A valve was replaced on-the subject drain line en September 29, 1985. The ASP.ECode(articleIWA-4400)beginningwiththe1977editionhasexempted the system hydrostatic pressure test after repair for component connections, 1

piping, and associated valves that are 1 in, nominal pipe size and srialler.

The subjected drain line is of 3/4 in nominal pipe size.

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- 3-s The subject drain line has an installed flow restriction orifice that  ;

limits break flow from the Reactor Coolant System to that assumed in the safety analyses. The licensee has committed to perform dye penetrant and visual examinations.

l Based on the staff's evaluation, the staff has determined that the ende l requirements are impractical and that the relief request is authorized by law and will not endanger life or property or the common defense and security and is otherwise in the public interest giving due consideration to the burden upon the licensee that could result if the requirements were imposed l on the facility. It is further concluded that the alternative examinations discussed above will provide the necessary added assurance of the drain

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line's structural reliability. Accordingly, the requested Relief should be-granted from the pressure test for the subject drain line after repair, on the condition that the licensee shall perform the proposed dye penetrant and visual examinations.

Dated: March 17, 1986 PRINCIPAL CONTRIBUTOR:

S. Lee r

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