ML19294C183
| ML19294C183 | |
| Person / Time | |
|---|---|
| Issue date: | 11/26/1979 |
| From: | Bessette D Advisory Committee on Reactor Safeguards |
| To: | Bender M, Okrent D, Shewman P Advisory Committee on Reactor Safeguards |
| Shared Package | |
| ML19294C184 | List: |
| References | |
| REF-GTECI-A-03, REF-GTECI-A-04, REF-GTECI-RV, REF-GTECI-SG, TASK-A-03, TASK-A-04, TASK-A-3, TASK-OR ACRS-SM-0151, ACRS-SM-151, NUDOCS 8003070291 | |
| Download: ML19294C183 (2) | |
Text
~ 8[g.cn macq)o ge UNITED STATES A4'#s5 " U U NUCLEAR REGULATORY COMMISSION gg
' g ADVISORY COMMITTEE ON REACTOR SAFEGUARDS
. j 0,
a WASHINGTON, D. C. 20555 k
o g
November 26, 1979 D..
ert T0:
P. Shewmon
)
M. Bender
) Metal Components Subcommittee H. Etherington )
NRC REQUIREMENTS FOR PWR SECONDARY WATER CHEMISTRY Secondary system water chemistry has a significant effect on steam generator materials performance.
It is, therefore, of interest to know what the NRC requirements are for control of secondary water chemistry. The following summarizes these requirements.
Prior to 1976 there were no NRC imposed secondary chemistry requi rements.
In 197t3,the NRC imposed a Standard Technical Specification (STS). The STS required:
(1) water chemistry be maintained within set limits; (2) sampling to be performed at a set frequency; and (3) sampling to be performed at defined locations in the circuit. The limits, frequency, and locations were defined by the licensee about six months after issuance of full power license. The STS was imposed on 12 plants.
Of the 12, only 3 actually developed a w:.ter chemistry program according to the STS.
Currently, the NRC wants to remove the STS, believing it to be unworkable and of little benefit.
Instead, the NRC wants the plants to submit their water chemistry program for information purposes (not for review and approval). The NRC would then use this information to better evaluate what actions to take should a plant's steam generator inspection show significant materials degradation.
If a plant's water chemistry program was relatively poor and its steam generators showed degradation, the NRC's sanctions would be more severe than if the water chemistry program was relatively good.
The NRC Staff does not want to impose secondary water chemistry require-ments because that would mean the subject would have to be designated
" safety related." Whatever limits the NRC set would have to be defended and justified.
Groups in the NRC Responsible for Secondary Water Chemistry Like most topics, responsibility for secondary water chemistry is shared among various groups within NRC. Within Nuclear Reactor Regulation (NRR) i 80 030#0 2 9l
2.
Materials Engineering Branch in the Division of Systems Safety is responsible for-design review at CP and OL stage; Engineering the groups are:
-;k; T
Division oi Opera.
Water Reactors in) yision of Project Management.
What NRC is Doing About Secondary System Chemistry Related Steam Generator Problems NRC efforts on steam generator materials degradation problems are summarized In in task action plans A-3 and A 4, which are attached as an appendix.
The addition, NUREG-0523 was issued by D. Eisenhut, et al., in January,1979.
report is a summary of operating experience with U-tube steam generators.
? L BJ David E. Bessette ACRS Fellows E. Igne cc: