ML19093B050
| ML19093B050 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 02/14/1978 |
| From: | Stallings C Virginia Electric & Power Co (VEPCO) |
| To: | Case E, Reid R Office of Nuclear Reactor Regulation |
| References | |
| Serial No. 019 | |
| Download: ML19093B050 (2) | |
Text
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Riol'lM:OND, VIRGINIA 23261 February 14, 1978 Mr. Edson G. Case Acting Director*of Nuclear Reactor Regulation
- united States Nuclear Regulatory C~mmission
.Washington, D. c. *20555 Attention:* Mr. Robert w. Reid, Chief Operating Reactors Branch 4
Dear Mr. Case:
50-281 License N~s. DPR-32 DPR-37 STF.AM GEt~ERATOR REPLACEMENT SURRY POWER STATION UNIT NOS. 1.AND 2 Due to st~am generator* tube degradation, the Virginia Electric ana*Power. Com-pany has determined that the replacement of all.steam generators for.Surry Power
. Station Unit Nos; 1 and 2'will be necessary.
At the time this decision was made,
- the history of tube failures for both units.indicated that an unacceptable unit*
-availability would persist uiltil*steam-generators could be *replaced. Accordingly, preliminary arrangements were made to*replace 'steam generators on both units at the earliest possible date.
As explained in our submittal of Aµgust 17, 1977 en-titled. "Steam Generator Program, Surry -Power Station, Unit lios. 1 and 2", the pre-liminary schedule* included the replacement of Unit 1 steam generators.during the period of May through October of* *1978 and Unit 2 steam generators during the per-iod February through July 1979.-.
. However,
- components and materials necessary for steam generator replacement.
ar~ behind schedule and ther~ may be considerable delays in deliveries beyond the originally scheduled dates *. If the.preliminary schedule for Uriit 1 steam geni;ra-tor replacement is maintained and if component or material delivery delays do oc- -
cur, the outage would extend accordingly. In view of this.risk, a new steam gen-erator replacement schedule baa become necessary.
The new schedule would include
- the replacement of Unit 2 steam*getteratora during the period October 1978 to May 1979 _and Unit 1 steam generators _during the period November-1~79 to April 1980.
In addition to reducing the risk of outage extension due to delays in deli-veries, the new schedule offers several other advantages.
Concurrent with the development and.implementation of an.improved st~em generator.inspection and pre-ventative tube plugging program, the availability of both units has improved con-
- siderably.
The improvement in availability has provided additional scheduling flexibility.and altered the optimal outage ocheduling*sequenc~ for our nuclear and fossil units.. The new schedule represellts an* optimal. outage sequence based on.
,*.~*-.
r Hr. Edson _G.. Case Page No. 2 the improved nuclear tulit availability. T~*new sche4ule.will"place both steam generator replacement outages d~ring -periods 01: reduc'ed system -demand and eli-minates the need _for back to back outages, a potential prob_lem should the fire~
outage extend beyond its scheduled coropiet:i.on date. -
Th~s, t~e new schedule reduce~.t:he risk of outage exteiis:ldn due to delays in component or materials_delivery and optimizes th~ schedulillg of-station out~
~
ages *.
Steam generator inspection and plugging criteria for continued operation*
- will be consistent with those currently being* utilized.
- Due to the* redu~ed incidenc:~ of tube,~ailures and. improved techniques in_
failure dete~tion and prevention,
- the *additional operation with the existing *
- _ steam *generators poses no. danger to the health and saf e~y of the general public.
~
cc:
Mr. Robert W *. Re.idv-'-_
.r...
Very truly yours,
-~ *7/)/J
.. 7-ZJ}, ~ // (i \\0~it4(-L,:o/, _--
-.c-. M. Stallings.
Vice. President - l?ower. Supply._* -*
- and.Production.Operations
,' ~. '.