ML20002E188
| ML20002E188 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 01/16/1981 |
| From: | Nichols T SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8101260607 | |
| Download: ML20002E188 (2) | |
Text
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Mr. James P. O'Reilly U. S. Nuclear Regulatory Commission U,
e Region II, Suite 3100 101 Marietta Street, N.W.
Atlanta, Georgia 30303 Subj ect: Virgil C. Summer Nuclear Station Docket No. 50/395 l
Reportable Item in Accordance with 10CFR21 I
Inadvertent Boron Dilution 4
Dear Mr. O'Reilly:
On October 24, 1980, South Carolina Electric & Gas Company (SCE&G) informed NRC of a substantial safety hazard concerning the potential for an inadvertent boron dilution event at cold or hot shutdown conditions while on the Residual Heat Removal System. A boron dilution results in a reactivity addition which could lead to a loss of shutdown margin and cause a substantial safety hazard as defined by 10CFR21. Under the SCE&G program, we reported this as a signif-icant deficiency under 10CFR50.55(e).
f On November 20, 1980, SCE&G submitted an interim report on this item.
At-tachment A of this report presented a discussion of the Westinghouse concerns and recommended actions. Appendix A of Attachment A presented two methods for locising out reactor makeup water supply. There are some incorrect valve number-listed in these methods.
In Item 1, valve 8457 is incorrect and should be
,I designated as valve 8430.
In Item 2, valve FCV-114A is incorrect and should be designated as valve FCV-168A.
s A final report will be issued after the Westinghouse investigation is completed and the long-term solution has been evaluated.
If you have any questions concerning this report, please call me.
Very truly yours, f
f x
T. C. Nichols, Jr.
BSM:TCN:gib cc: Page Two
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p-Mr. James P. O'Reilly January 16, 1981 Page Bro cc:
B. A. Bursey V. ' C. Sunener G.
H.~ Fischer W. A. Williams, Jr.
T. C. Nichals, Jr.
E. H. Crews, Jr.
D. A. Nauman O. S. Bradham O. W. Dixon, Jr.
J. B. Knotts, Jr.
R. B. Clary i
A. R. Koon A. A. Smith J. L. Skolds I&E (Washington) t t
Document Management Branch (55e/21/LER Only)
NPCF/Whitaker File t
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