ML20005G399
| ML20005G399 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 01/04/1990 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20005G393 | List: |
| References | |
| GL-88-01, GL-88-1, NUDOCS 9001190094 | |
| Download: ML20005G399 (2) | |
Text
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SAFETY EVALUAT10ft BY THE OFFICE OF NUCLEAR REACTOR REGULATION EVALUATION OF NRC GENERIC LETTER 88-01 RESPONSE-p_ETROI,T_EDJS0 TLC _0M,PANY D
WOLVERINE, POWER SUPPLY Cp0PERATIVEiJRRPORATED FERMI, UNIT 2 DOCKET NO. 50,,3_4,1 fl[0-INTRODUCTION Detroit Edison Company, the licensee, submitted its response to NRC Generic Letter (GL)88-01,"NRCFositiononIGSCCinBWRAusteniticStainlessSteel Piping" for Fermi, Unit 2 by letters dated August 5, 1988, and April 27, 1989.
Additicr.e.1 information as requested by the staff was provided by. letter dated
. May 12.-1989.. Generic Letter 88-01 requested licensees and construction permit -
holders to resolve the 1GSCC issues for BWP piping made of austenitic stainless steel that is 4 iriches or larger in nominal diameter and contains reactor coolant at a ter..perature ebove 200 degrees Fahrenheit during power operation regardless of Code classification. The licensee was requested to address the followirg:
-1.
The current plans regarding pipe replacement and/or other tr.casures taten to raitigate IGSCC and~ provide assurance of continued long terra integrity and reliability.
2.
' The licensee should comit that the Inservice Inspection (ISI) Program to be
- iraplemented at the next refueling outage will include piping covered by the scope of GL 88-01 and will be in conformance with staff positions on schedule, methods and personnel, and sample expansion included in GL 88-01.
3.
The Technical Specifications (TS) should be changed to include a staternent in the section on 151.that the ISI Program for piping covered by the scope
-of this letter will be in accordance with NRC staff positions on schedule.
methods and personnel, and sample expansion included in GL 88-01.
(See modelBWRStandardTSenclosedinGL88-01.) It is recognized that the Inservice Inspection and Testing sections may be removed from the TS Improvement programs.
In this case, this requirement shall remain with the ISI section when it is included in an alternative document.
4..
Confirmation of the licensee's plans to ensure that the TS related to leakage detecticn will be in conformance with the staff position on leak detection included in GL 88-01.
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Thelicensee'splanstonotifytheNRCinaccordancewith10CFR50.55a(g)
I of any flaws identified that do not meet IWB-3500 criteria of Section XI of the Code for continued operation without evaluation, or a change found in the condition of the welds previously known to be cracked, and your evaluation of-the flaws.for continued operation and/or your repair plans.
2.0,D_lSCUSSION-4
.The licensee's response to NRC GL 88-01 has been reviewed by(VSI).
the staff with the assistance of its contractor, Viking Systems International As a result of this review, only.one open issue remains. The licensee's position concerning leakage limits in the current Fermi-2 TS is less conservative than what is provided in NRC GL 88-01,.is not adequately justified, and is therefore i,
' unacceptable. The Fermi-2 TS requires plant shutdown when the increase in unidentified leakage exceeds 2 gpm over a four-hour period rather than a 24-hour period ~as required by GL 88-01; 7
13.0 CONCLUSION
i Based on the review of the licensee's NRC GL 88-01 response, the staff concludes that the response as evaluated is acceptable with the exception of the n
licer.see's position-concerning leakage limits. Staff recomends that the licensee propose a change to the Fermi-2 TS for determining an increase of 2 t
gpm leakage from 4.to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> in accordance with GL 88-01. The staff also q
concludes that the proposed IGSCC inspection and mitigation program will provide
. reasonable assurance of maintaining the long-term structural integrity of austenitic stainless steel piping in the Fermi-2, BWR Nuclear Power Plant.
' Principal Contributors:
T. McLellan.
W. Koo J. Stang Dated:
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