ML19253A208
| ML19253A208 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 07/23/1979 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| References | |
| TAC-08247, TAC-8247, NUDOCS 7908200107 | |
| Download: ML19253A208 (4) | |
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3 UNITED STATES g j > -c,( ( h NUCLEAR REGULATOFlY COMMISSION pf g E WASHINGTON, D. C. 20555
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Docket No. : 50-312 Mr. J. J. Mattimoe As istant General Manager and Chief Engineer Sacramento Municipal Utility District 6201 S :.treet P. O. Box 15830 Sacramento, California 95813
Dear Mr. Mattimoe:
RE: RANCHO SECO NUCLEAR GENERATING STATION In August 1976 we sent letters to the majority of licensees wno operate Pressurized Water Reactors (PWRs) regarding the control of seconaary water chemistry to inhibit corrosion of steam generator tuces. The letters requestea the licensees to prcpose Technical Specification changes to incorporate limiting conditions for operation ano surveillance requirements for secondary water chemistry parameters. hacel Technical Specifications, which reflected the requirements contained in the Comission's Standard Technical Specifications (STS), were inclucea for guidance.
Many licensees oojected to tne Model Technical Specifications principally on the basis that they could unnecessarily restrict plant operation. The majority of these licensees submitted alternative approaches that were directed more toward monitoring and record keeping ratner than specific limits on chemistry parameters. At the time of our request, we recognized that a major disadvantage of the Technical Specifications was a. potential decrease in operational fle.Tibility, but our request was motivatea by an overriding concern for steam generator tube integrity. Our objective was to provice acaed assurance that licensees would properly r.:enitor and control secondary water chemistry to limit corrosion of steam cenerator tubes.
However, based on the experience and kncwledge gained since 1976, we have now concludea that Technical Specification limits would not be the most eff%tive way of accocplishing this objective. Que to the co:.plexity of the corrosion phenomena involvea, and the state-of-the-art as it exists today, we believe that a nme effective approacn woula be to institute a license condition that requires the inplementation of a secondary uter chemistry monitoring and control program containin9 cD approp riatt urocecures and administrative controls. A hacel License cc Ccndition that is acceptable to the staff for tnis purpose is encloseo.
cv The recuired program and procecures would be developea by the licensees, witn any needed input f rom their reactor vendors or other consultants, ana tnus could more readily account for site and plant specific factors O
that affect chemistry conoitions in tne steam cenerators.
I n ou r vdw,
CO sucn a license condition would provide a%rhnce th%thlicensees culd VUI t.
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Sacramento Municipal Utility District devote proper attention to controlling secondaraj water chemi stej, while also providing the needea flexibility to allow them to more effectively deal with any off-normal conditions that might arise.
Foreover, we have concluded that such a license condition, in conjunction with existing Technical Specifications'on steam generator tube leakage ano inservice inspection, would provice tne most practical
, and cocprehensive means of assuring that steam generator tube integrity is maintained.
i Consequently, we request that you submit a proposed amnoment to your license to incorporate the requirements of the enclosed Model License l
Concition into the bocy of your license within 60 days.
If you previously submitted an aoplication for a license amencment concerning steam generator monitoring requirements prior to harch 22, 1978, you need not remit a fee for the license amendment requested by this letter.
If you have not submitted a license amencment request prior to March 22, 1978, you should remit a Class III fee with your tpplication.
If you have any questions, please contact us.
No further action will be taken on any proposed Technical Specification changes you may have suomitted in response to our August 1976 request.
Such change reques:s will be considerea withdrawn unless ycu express oajections within 60 days.
Sincerely, M
'.s Robert W. Reid, Chief Operating Reactors Branch 34 Division of Operating Reactors
Enclosure:
Mocel License Condition cc w/ enclosure:
See next page 801 289
Sacranento f!unicipal Utility District cc: David S. Kaplan, Secretary and General Counsel G201 S Street Post Of fice Box 15830 Sacramento, California 95813 Mr. Robert 8. Borsum Babcock & Wilcox Nuclear Power Generation Division Suite 420, 7735 Old Georgetown Road Bethesda, Maryland 20014 Business and Municipal Department Sacramento City-County Library 828 I Street Sacramento, California 95814 9
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i ENCLOSURE MOCEL LICENSE CONDITION SECCNCARY 'iATER CHEMISTRY MONITCRING The licensee shall implement a secondary water chemistry monitoring program to inhibit steam generator tube degradation. This program shall include:
.l.
Identification of a sampling schedule for the critical parameters and control points for these parameters, t
2.
Identificaticn of the procedures used to. quantify parameters that I
are critical to control points; 3.
Identification of process sampling points; 4.
Procedure for the, recording and management o' data; 5.
Procedures defining corrective actions for off control point chemistry conditions; and
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6.
A procedure identifying the authority responsible for the inter-pretation of the data, and the sequence and timing of acninistrative events required to initiate corrective action.
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