ML19247B809
| ML19247B809 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 08/02/1979 |
| From: | Parr O Office of Nuclear Reactor Regulation |
| To: | Eric Turner HOUSTON LIGHTING & POWER CO. |
| References | |
| NUDOCS 7908130544 | |
| Download: ML19247B809 (4) | |
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NUCLEAR REGULATORY COMMISSION g
Y hE W ASHINGTON, D. C. 20555 s..~..[.p AUG 0 21979 Docket t.o. STN 50-498 and STN 50-499 Mr. E. A. Tu rner Vice President Houston Lighting and Powr Company P. O. Box 1700 Houston, Texas 77001 Dea r Mr. Tu rner:
SUB JECT: SEC0f,DA'd WATER CHEMISTRY CONTROL (South Texas Projects, Units 1 and 2)
In late 1975 we incorporated provisions into the Standard Technical Specifi-cations (STS) that required limiting conditions for operation and surveillance requirements for secondary water chemistry parameters. The proposed Technical Specifications for your plant (s), as well as for other Pressurized Water Plants that have been issued an Operating License since 1974 or are now under review for an Operating License, contain either these provisions or a requirement to establish these provisions after baseline chemistry conditions have been determined.
The intent of the provisions was to provide added assurance that the operators of newly licensed plants would properly monitor and control secondary water chenistry to 1imit corrosion of steam generator tubes.
In a number of instances the Technical Specifications have significantly restricted the operational flexibility of some plants with little or no benefit with regard to limiting corrosion of steam generator tubes. Based on this experience and the knowledge gained in recent years, we have concluded that Technical Specification limits are not the most effective way of assuring that steam generator tube corrosion will be minimized.
Due to the complexity of the corrosion phenomena involved and the state-of-the-art as it exists today, we believe that, in lieu of Technical Specifications, a more ef f'ctive approach would be to institute a license condition that requires the implementation of a secondary water chemistry monitoring and control program containing appropriate procedures and admin-istrative controls.
The required program and procedures would be developed by the licensee (orM~
applicant) with any needed input from their reactor vendors er other g y,
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ccnsultants, and thus could n: ore readily account for site and plant-specilic factors that affect chenistry conditions ia the steam generators.
In our {-
view, plant operation following such procedures would provide assurance i
that licensees would devote proper attention to controlling secondary water chemistry, while also providing the needed ficxibi. ity to allow + hem to deal inore effectively with any of f-normal conditions that might arise.
LIS119 7008130
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t r. E. A. Turner AUG 0 21979 Consequently, we request that you submit within 60 days your proposed secondary water chemistry program which will be referenced in a condition to your operating license and will replace any proposed Technical Specifications on secondary water chemistry. A model license condition is enclosed. We have concl uded that such a license conJition, in conjunction with existing Technical Specifications on steam generator tube leakage and inservice inspection, would provide the most practical and comprehensive means of assuring that stean generator tube integrity would be maintained.
If you have any questions, please contact us.
Sincerely, IS. b an D. Parr, Chief Light Water Reactors Branch feo. 3 Division of Project Management Encl osu re :
Model License Condition cc w/ enclosure:
See next page
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Mr. E. A. Turner cc: Mr. D. G. Barker fir. Troy C. Webb w
. Manager, South Texas art Assistant Attorney General s-
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Houston Lighting anc Company Environmental Protection Div.
P. O. Box 1700 P. O. Box 12548 Houston, Texas 770 Capitol Station Austin, Texas 78711 Mr. M. L. Eorchel t Central Power and L1
- ny fir. R. Gordon Gooch, Esq.
P. O. Box 2121 Baker & Botts Corpus Christi, Texa 1701 Pennsyl vania Avenue, N.W.
Washington, D. C.
20006 P
Mr. R. L. Hancock E~P City of Austin Di rector, Governor's Budget h
Electric Utility Den and Planning Of fice
.s P. O. Box 1088 Executive Of fice Building Austin, Texas 78767 411 W. 13th Street Austin, Texas 78701 i
Mr. J. B. Poston Assistant General P<
for Operatiors John L. Anderson City Public Service.
Oak Ridge National Laboratory L.;,
P. O. Box 1771 Union Carbide Corpor' tion 64 '.
San Antonio, Text s i didg. 3500, P. O. Bo, X Oak Ridge, Tennessee 37830
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Mr. Jac k R. Ne u,n, i Lo ve ns t e i n, Ne vn an, T.
ac 6 Toll 1025 Connecticut Aser h.
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Washington, D. C.
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Mr. Melbert Schwarz,
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Baker & Botts P'
One Shell Plaza p
Houston, Texas 7700:
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Mr. A. T. Pa rk er Pir$
Westinghouse Electric oration Mi Q*/V P. O. Box 355 Pittsburgh, Pennsyl vi
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Mr. E. R. Sc hni dt NUS Corporation 4,..-
NUS-4 Research Place Rockville, Maryl and
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-e Mr. J. H. Pepin Brow 1 & Root, Inc.
P. O. Box 3 5
Houston, Texas 77c
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ENCLOSURE FDDEL LICENSE CONDITION SECONDARY WATER CHEFJSTRY FDNITORING The licensee shall implement a secondary water cheaistry monitoring program in accordance with ( reference Licensee's Procedure) to inhibit steam generato.'
tube degradation.
This program incl udes:
1.
Identification of a sampling schedule for the critical parameters and of control points for these parameters; 2.
Identification of the procedures used to measure the value of the critical
. pa r ameters ;
3.
Identification of process sampling points; 4.
Procedure for the recording and management of data; 5.
Procedures defining corrective actions for off-control point chemistry conditions ; and 6.
A procedure identifying (1) the authority responsible for the interpretation of the data and (2) the sequence and timing of adainistrative events required to initiate corrective action.
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