ML19257A073
| ML19257A073 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 11/26/1979 |
| From: | Wigginton D Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8001020046 | |
| Download: ML19257A073 (3) | |
Text
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{ }- )Mg (' g NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555
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November 26, 1979 Docket No. 50-334 LICENSEE:
Duquesne Light Company FACILITY: Beaver Valley, Unit No. 1
SUBJECT:
MEETING
SUMMARY
- REACTOR BUILDING SUMP pH CONTROL The licensee and representatives of Stone and Webster met with the staff on November 8,1979 to discuss the reactor building sump pH control as a result of proposed modifications to assure adequate net positive suction head (NPSH) to recirculation and low head safety injection pumps. An attendance list is attached.
As a result of the NPSH problems and proposed changes to the quench spray system, the lowest final pH of the sump could be as low as 7.2 while at least a pH of 8.0 is recuired to meet original design values. The licensee has considered adding baskets of tri-sodium phosphate (TSP) to the sump if needed, however, there are no definitive guidelines or standards on the use of TSP in regards to caking, solubility, surveillance requirements, etc. Calvert Cliffs was recommended to DLC for further discussion, as a plant with baskets in the sump. The use of hydrozene was discussed but it would represent a new unreviewed system for Beaver Valley No.1.
The preferred approach by the licensee would be to raise the pH in the chemical addition tank which would have a direct effect on the sump pH.
In addition to the pH control problem in the sump, the gravity feed system from the chemical addition tank proposed by DLC is based on an analysis method which has not been benchmarked or proven.
It will be necessary for DLC to conf?rm the model against actual tests and then make a case for the model applicability to the proposed gravity feed system. A positive displacement pump or eductor may be considered in lieu of the gravity feed system in which case the model verification would not be needed.
The licensee will further consider the alternatives and advise the NRC.
f Dave Wigginton, roject Manager-Operating Reactors Branch #1, D0R
Attachment:
List of Attendees cc: w/ attachment i665 116 See next page
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ATTACHMENT REACTOR BUILDING SUMP pH CONTROL BEAVER VALLEY l
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NOVEMBER 8, 1979 Organization Name D. Wigginton ORB 1 - NRC F. A. Elia Stone and Webster R. M. Stark Stone and Webster E. A. Thomas Stone and Webster R. P. Musselman Duquesne Light Company J. J. Moran Stone and Webster N. R. Tonet Duquesne Light Company J. J.Carey Duquesne Light Company C. E. Ader Stone and Webster J. B. J. Read AAB - NRC W. F. Pasedag EEB - NRC 1665 117
Meeting Summary for Beaver Valley 1 November 26, 1979 Docket Files NRC PDR Gerald Charnoff, Esquire Local PDR Jay E. Silberg, Esquire ORB 1 Reading Shaw, Pittman, Potts and Trowbridge NRR Reading 1800 M Street, N.W.
H. Denton Washington, D. C.
20036 E. Case D. Eisenhut Karin Carter, Esquire R. Tedesco Special Assistant Attorney General G. Zech Bureau of Administrative Enforcement B. Grimes 5th Floor, Executive House W. Gammill Harrisburg, Pennsylvania 17120 L. Shao J. Miller Mr. Roger Tapan R. Vollmer Stone and Webster Engineering T. J. Carter Corporation A. Schwencer P. O. Box 2325 O. Ziemann Boston, Massachusetts 02107 P. Check G. Lainas Mr. J. D. Woodward D. Crutchfield R & D Center B. Grimes Westinghouse Electric Corporation T. Ippolito Building 7-303 R. Reid Pittsburgh, Pennsylvania 15230 V. Noonan
.G. Knighton D. Brinkman Mr. Jack Carey Project Manager Technical Assistant OELD Duquesne Light Company P. O. Box 4 01&E (3) 'h/P. Kreutzer Shippingport, Pennsylvania 15077 C. Parris ACRS (16)
NRC Participants Mr. R. E. Martin NSIC Duquesne Light Company
' TERA) 435 Sixth Avenue Licensee Pittsburgh, Pennsylvania 15219 Mr. James A. Werling Marvin Fein P1 ant Superintendent Utility Counsel Beaver Valley Power Station City of Pittsburgh P. O. Box 4 313 City-Count ~y Building Shippingpcrt, Pennsylvania 15077 Pittsburgh, Pennsylvania 15219 Mr. John A. Levin Public Utility Commission P. O. Box 3265 Harrisburg, Pennsylvania 17120 1665 118