ML19317G779
| ML19317G779 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 08/23/1976 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| Shared Package | |
| ML19317G780 | List: |
| References | |
| NUDOCS 8004010605 | |
| Download: ML19317G779 (2) | |
Text
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V C
o August 23, 1976 DISTRIBUTION:
NRC PDR Dross L PDR JWetrnore Gocket flo. 50-312 Docket File ORB #4 Rdg b
VStello KRGoller Sacranento 'tunicipal Utility District F
ATTH: !1r. J. J. ifattimoe TJCarter Assistant General Manager OELD and Chief Enoineer 01&E (5) 6201 S Street RReid P. O. Box 15830 VRooney (2) p~~
Sacranento, California 95813 DEisenhut TBAbernathy Centlenen:
JRBuchanan ACRS (16)
RE: RA';CHO SECO NUCLEAR GENEPATING STATIOH L
The steam generator tubing in pressurized water reactors (PUP's) is part of the reactor coolant pressure boundary.
Thus, in keeping with 10 CFR Part 50, Appendix A, teneral Design Criterion 31, " Fracture Prevention of Reactor Coolant Pressure Roundary", the stcan generator l'
tuning should rerain free of cracks, oerforations and general deterioration to raininize the likelihood of failure.
For sone tirae, the HRC staff and its consultants have been examining the factors that contribute to the degradation of steam gener: tor tubing.
Based on the results of laboratory testing to date cno the operating experience that has been obtained by the industry, it is apparent that, although the mechanisns are complex and varied, the contarination of the steam cenerator secondary ccolant is the fundamental cause of tube degradation and the ir pairnent of tube integrity.
It is also apparent that careful contrei of the secondary water chenistry serves to inhibit the potential acctr ilation of corrosive 1" purities in the steam generator and thereby limits tube deoradation.
Censequently, it is tre staff's position that secencary water chenistry nonitoring re uiresients shoulo he nade part of the Technical Specifica-tinns for all ?Wp.'s.
In this connection, we recconize that dif ferent utilities use different seconciry wate. treatment methods to limit stear nonerater tune corrosion. !!oreover, we recognize that a licensee's choice of a particular nator treat:ient method, including snecific values of xnratirg linits for cheoistry parametcrs, is everned by plant cod si.e cimracteristics that are unique tn each facilitv.
In a.ddition, we nat s lieve at this ti T that sufficient service experience exists c3 e
tn concleae that any :,3rticule.r rethod is superior to anotScr for cc':trollint inpurities that ray be intrcMced into the secondary c>mlant.
Mcuever, it is cur rosition that secondary water chenistry "cnitoring rec 9 ire ~ents are r.ecessary to ensure the control of harmful 1;me-ity cccumlation in the ster?
crators. c.i:ch a ronitorinn THIS DOCUMENT CONTAINS y0.04010 h O 9 POOR QUALITY PAGES
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Sacra tento l'.unicipal Utility L.'_..
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progran would provide infomation regarding the magnitude of impurity t'uildup and would nake it possible to detect the presence of a
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potentially corrosive environnent and would provide a basis for taking appropriate corrective action.
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Accordingly, we request that you propose changes to your Technical Specifications, witnin 30 days, that will incorporate secondary water chemistry limiting conditions for operation and surveillance requirements in accordance with the enclosed Model Technical D: 9:
Specification. You should exanine your current practices regarding secondary water chemistry control in light of your operating experience and your particular plant and site characteristics and propose appropriate limits for the parameters listed in Table 3.XX of the l'odel Technical Specification.
Your subnittal should include the basis for each of the proposed limits.
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If you have any cuestions, please contact us.
Stocerely, 6841ca1 $;gned by
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Robert W. Reid, Chief Operating Reactors Branch #4 Division of Operating Reactors
Enclosure:
l'odel Technical Specifications cc v/ enclosure:
" avid S. Vaplan, Secretary anc General Counsel 6201 s Street Fost Office Box 19330 Sacranento, California % 313 3stsiness and l'unicipal Departaent Sacranento City-Co;nty Library 623 I Stecat
%cranento, Californi.i M il '.
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