ML20054F854
| ML20054F854 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 06/14/1982 |
| From: | Dixon O SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8206180009 | |
| Download: ML20054F854 (3) | |
Text
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I
- Q SOUTH CAROLINA ELECTRIC & GAS COMPANY post omca now ve4 f
Cott as>A. Soum CanouNA 29218 O W. Dmon. Jn d','O'*[7'5~.
June 14, 1982 o
Mr. Harold R. Denton, Directc,/
Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Ccmnission Washington, D.C.
20555
Subject:
Virgil C. Sumer Nuclear Station Docket No. 50/395 Service Water Pond Structures SER Item 1.8.20
Dear Mr. Denton:
South Carolina Electric and Gas Cmpany (SCE&G) has reviewed the NRC letter, B. J. Youngblood to T. C. Nichols dated June 4,1982, concerning nonitoring of the Virgil C. Sumer Nuclear Station service water pond structures (SER Item 1.8.20).
Our coments and proposals are as followg:
(1) The service water pond was inpounded in 1978 and an appropriate inspection program was developed in accordance with the recanmendations of Regulatory Guide 1.127.
Inspections hmve been performed annually through 1982. The north and south dams of the service water pond are considered the only two vital structures for maintaining water within the pond. The east dam provides only a crest to a natural ridge, while the west embanknent is strictly the edge of the plant yard. For these reasons, the inspection program for the service water pond includes alignment and settlement for only the north and south dams. Visual inspections have been performed for all four structures to check for erosion, riprap protection, slaughing, settlenent, organic growth, etc. As stated previously, in accordance with Regulatory Guide 1.127, these inspections have been performed for five consecutive years. We consider that all the required baseline data has been obtained for the north and south dams; therefore, future inspections will be done in 19N. 1986, 1991, and at five year intervals thereafter.
(2) The service water pmphouse and intake structure are vital for conveyance of water from the por.d to the nuclear plant. These facilities are located on the west embankment and have been continuously monitored since 1977 to ensure that their function has not been cmpranised. We have previously cmmitted to semi-annually survey both structures for settlement and differential novement. Since these structures have been continuously monitored (with minimal movement since 1978), we feel that the west enbanknent itself has not experienced any unusual movenent. Regardless, at the Staff's request we will initiate additional inspections of the west enbankment, i.e., install alignment monunnnts at the crest and perform a slope survey. These inspections will be performed in 1982, 1983, 1984, 1986, 1991, and at five year intervals thereafter.
Bool 8206190009 820614 PDR ADOCK 05000395 E
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3 Mr. Harold R. Denton June 14, 1982 Page 2 (3) The service water intake structure (tunnel) has been continuously surveyed for settlenent/ rebound since 1978, by means of 3 masts (one at each end, and one approximately at the middle). Cracking of the tunnel will occur only if there is a significant differential settlement / rebound from one point to another. Since 1978 there has been an insignificant amount of movement of the structure as indicated by the masts. An underwater diver's inspection was conducted in 1979 and no new cracking was observed.
For these reasons, we do not believe that the tunnel has been subjected to any significant movenent. Despite this fact, we will perform additional diver inspections of the tunnel in 1982 and at refueling outages as close as possible to the years 1984, 1986, 1991, and at five year intervals thereafter.
We believe that the NRC's recomendation to initiate a baseline inspection as soon as practicable with annual inspections for the subsequent four years should consider the extensive inspections performed since 1978. It is our position that the inspection programs outlined in Itens 1-3 above meet or exceed the intent of Regulatory Guide 1.127 and provide assurance of integrity of the vital conponents for energency cooling. We are receptive to the NRC's coment that less frequent inspectione may be acceptable if the results of the future inspections warrant such relaxation. In the same light, it is understood that more frequent inspection may be required if the results of future inspections indicate any trends which cause concern.
We request that the Staff evaluate our proposed inspection schedule in a timely manner to achieve expeditious resolution of this issue.
If you have any questions, please let us know.
Very truly yours, O. W. D' n, Jr.
NEC:OWD,jr:lkb cc: See Page Three
I i
P Mr., Harold R. Denton June 14, 1982 Page 3 cc:
V. C. Sumrer G. H. Fischer H. N. Cyrus T. C. Nichols, Jr.
O. W. Dixon, Jr.
M. B. Whitaker, Jr.
J. P. O'Reilly H. T. Babb D. A. Nauman C. L. Ligon (NSRC)
W. A. Williams, Jr.
R. B. Clary.
O. S. Bradham A. R. Koon M. N. Browne G. J. Braddick J. L. Skolds J. B. Knotts, Jr.
D. A. Bursey NPCF File
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