ML19095A290
| ML19095A290 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 02/09/1978 |
| From: | Stallings C Virginia Electric & Power Co (VEPCO) |
| To: | Case E, Reid R Office of Nuclear Reactor Regulation |
| References | |
| Serial No. 054 | |
| Download: ML19095A290 (2) | |
Text
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February 9, 1978 Mr. Edson G. Case, Acting Director Office of Nuclear Reactor Regulation Attn:
Mr. Robert W. Reid, *chief Operating Reactors Branch No. 4 Divisi6n of Operatin~ Reactors U.S. Nuclear Regulatory c*onmission Washing,ton, D. C.
20555
Dear Mr. Case:
Serial No. 054 ES/JCW:kbo Docket Nos.* 50-280 50-28.1
- License Nos. DPR-32 DPR-37' This is to inform you of the recent history and current status of the Surry Power Station fixed temperature monitoring system in the James River.
As noted in our letter of February 9, 1977,* most 6f the monitoring equipment was lost due to unusual adverse weather conditions and ice.* We *advised also that the system was to be reactivated as soon as repair or replacement of monitoring equipment had been completed and as soon as river conditions per-mitted.
- Since several of the stationary towers in the river were lost in January, buoy/anchor attachments had to be devised and installed for mounting the appropriate instrumentation.
Installation of the system was completed in June, 1977.
.,These.Jns.trumen.ts,,.which record.water.temperature on film, are re-trieved every 2-3 months.
During each servicing run it has been observed that one or more of the instruments have been lost* to the hostile environment that exists in the James River.
Also, film jamming or other instrument malfunction from time to time results in limited data 16ss~
Replacements are made as soon as equipment is available and weather conditions permit.
Therefore, there is some data loss at certain locations within the network; data loss up to three months duration.
On the recent January service date, it was noted that several instru-ments had been lost due to ice conditions in the river.
New mountings were devised and all instrumentation was replaced eleven days later when weather conditions permitted.
Consequently, _there was a network-wide data loss of eleven days.
7,=, -
.... 04.soo 1 3
VIRGINIA ELECTRIC AND POWER COMPANY TO Mr. Edson G. Case P.age two The system, to the best of our knowle.dge, is presently in ful 1 operation *.
cc:
Mr. James P. O'Reilly, Director Very truly yours,
~, J!)z. v!iatbn~p/*
C. M. Stallings Vice President-Power Supply*
and Production Operations Office of Inspection and Enforcement
- Re*gion *I I