ML20245L162
| ML20245L162 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 04/20/1989 |
| From: | Cockfield D PORTLAND GENERAL ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-88-011, IEB-88-11, NUDOCS 8905050301 | |
| Download: ML20245L162 (3) | |
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mum David W. Cockfield Vice President, Nuclear I
April 20, 1989 Trojan Nuclear Plant Docket 50-344 License NPF-1 i
i U.S. Nuclear Regulatory Commission 1
ATTN:
Document Control Desk Washington DC 20555
Dear Sir:
Nuclear Regulatory Commission Bulletin (NRCB) 88-11
" Pressurizer Surr,e Line Thermal Stratification" Nuclear Regulatory Commission (NRC)Bulletin 88-11 requests that operating nuclear plant licensees establish and implement a program to confirm pressurizer surge line integrity in view of the occurrence of thermal stratification. Also, licensees are required to inform the staff of the actions taken to resolve this issue. As a result of the identification of unexpected pressurizer surge line movement at the Trojan Plant due to thermal stratification, Portland General Electric Company (PGE) has developed and implemented an action plan to address this issue. The NRC staff reviewed the plan in May 1988 and documented their acceptance'of it by'1etter, dated June 23, 1988.
Attached is a summary of our actions to address the specific items requested in this bulletin. We would be pleased to answer any questions you have concerning this response.
Sincerely, k
Attachment c:
Mr. John B. Martin Mr. R. C. Barr Regional Administrator, Region V NRC Resident Inspector U.S. Nuclear Regulatory Commissior Trojan Nuclear Plant Mr. William T. Dixon State of Oregon Department of Energy Subscribed and sworn to before me this 20th day of April 1989.
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121 S.W. Salmon Street, Portland, Oregon 97204,503/464-8897
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Troj n Nucicer Plant Documsnt Control Dssk f
Docket 50-344 Attachment j
License NPF-1 April 20, 1989 l
Page 1 of 2 i
PORTLAND GENERAL ELECTRIC COMPANY (PGE)
SUMMARY
OF EVALUATION OF NUCLEAR REGULATORY COMMISSION (NRC) BULLETIN 88-11 Requested Action 1.a Conduct a visual inspection [American Society of Mechanical Engineers (ASME),Section XI, VT-3 visual examination] of the pressurizer surge line (PSL). This inspection should determine any gross discernable distress or structural damage in the entire pressurizer surge line including piping, pipe supports, pipe whip restraints and anchor bolts.
PGE Response During the 1988 refueling outage, the Trojan Plant PSL piping, whip restraints, and hangers were visually inspected. No discernable distress or structural damage was found.
Requested Action 1.b Demonstrate that the pressurizer surge line meets the applicable design codes (fatigue analysis should be performed in accordance with the latest ASME Section III requirements incorporating high-cycle fatigue) and other Final Safety Analysis Report (FSAR) and regulatory commitments for the licensed life of the plant, considering the phenomenon of thermal strati-fication and thermal striping in the fatigue and stress evaluations.
PGE Response A bounding evaluation of the fatigue loading on the PSL piping was performed in accordance with ASME Section III, 1977 Edition through Summer 1979 Addende, by the Trojan Plant Nuclear Steam Supply System (NSSS) vendor. The fatigue analysis confirmed operability of the piping and nozzles for 40 heatup and cooldown cycles. With the cooldown for the 1989 i
refueling outage, Trojan has completed 36 cycles. Adequacy of the pipe whip restraints was confirmed by the Trojan Plant architect-engineer.
The plant-specific analysis to substantiate a 40-year plant life for Trojan is being performed by the NSSS vendor.
It is expected to be com-pleted in July 1989. The analysis will be performed in accordance with the latest ASME Section III Code approved for use by the NRC.
Requested Action 1.c Obtain plant-specific data on thermal stratification, thermal striping, and line deflections.
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, w Trojen Nucleer Plant Document Control Desk Docket 50-344 Attachment License NPF-1 April 20, 1989 Page 2 of 2 1
PGE Response 1
i By letter, dated September 27, 1988, PGE provided the staff with a summary report of the monitoring program at Trojan and the data representing the heatup and power operation portions of the program.
The cooldown portion of the data was obtained in November 1988. Data collected through the monitoring program have been provided to the Trojan NSSS vendor for the completion of the plant-specific analysis.
Requested Action 1.d Based on the applicable plant-specific data, update the stress and fatigue analyses to ensure compliance with applicable Code requirements.
PGE Response As discussed above in PGE Response to Requested Action 1.b, the stress and fatigue analyses will be updated to ensure compliance with applicable Code requirements. This is expected to be completed in July 1989.
Requested Action 3 Generate records to document the development and implementation of the program requested by the above Requested Actions 1.a through 1.d. as well as any subsequent corrective actions, and maintain these records in accordance with Title 10 of the Code of Federal Regulations, Part 50 (10 CFR 50), Appendix B and plant procedures.
PGE Response PGE will continue to document the development and implementation of the corrective action program for the PSL thermal stratification issue and will maintain the generated records in accordance with 10 CFR 50, Appendix B and plant procedures.
Reporting Requirements As requested in the bulletin, PGE w'ill submit a letter within 30 days after the completion of Requested Actions 1.b and 1.d, which notifies the staff that the actions have been performed and that the results are avail-able for inspection. A description of the analytical approaches used and a summary of the results will be included in the letter.
2997W.0489
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