ML20108A556
| ML20108A556 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 11/08/1984 |
| From: | Dixon O SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8411150057 | |
| Download: ML20108A556 (2) | |
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f SOUTH CAROLINA ELECTRIC 4k' gas COMPANY-
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L O' W. Dix 0N. JR. '
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- November;8, 1984:
3 5 NucLaAm OpsstATeosse -
1Mr..--Harold R. Denton,'DirectorE LOfficeiof Nuclear Reactor Regulation
?U.S.~ Nuclear Regulatory Commission Washington, D.C. 120555
Subject:
Virgil C. Summer Nucl' ear Station
. Docket ik). 50/395
. Operating License No. NPF-12:
Licensing Condition 2.C.19-Diesel Generator Vibration
Dear'Mr. Denton:
In a letter from O.'W. Dixon, Jr. to H. R. Dentonidated June 6, 1984, South Carolina Electric and Gas Company (SCE&G) outlined the~ modifications being made to the Emergency Diesel Engine Auxiliary' Support System-to meet Operating License = Condition 2.C.19 for the Virgil'C.. Summer Nuclear Station.- This letter is
-provided to clarify two'(2) points-in the June 6, 1984 letter
-concerning the components being relocated from the skid-mounted control' panels and :the location of one of the instrument stands.
' The active components in the control relay panel located on -the diesel' skid have been relocated to a new wall-mounted control' panel as outlined in our June 6, 1984 letter.
These active components
- include all relays, fuses, speed switches, and heaters.
.The existing control panel has been lef t mounted on the diesel skid and contains only passive components such as terminal blocks and' indicating lights.
Therefore,-this panel now serves only as a termination cabinet.
The pressure switches originally located on'an engine gauge board have been removed from the diesel skid-mounted location and installed on a floor-mounted instrument stand separate from~ the skid.
In addition, the air-start and shutdown solenoids have been moved to a second floor mounted stand separate from the skid.
The. connections from the floor stands to the diesel skid are made via flexible hoses and flexible conduits to reduce transfer of' i
, vibration (due to diesel vibration).
The diesel generator skid is supported by its own ' foundation that transfers load directly from elevation 436 to elevation 427 (basement floor).
This load bearing foundation directly below the skid consists of solid reinforced : concrete which extends from the 436 elevation floor down to,.and becomes a part of, the 427 elevation (basement floor). 'The basement floor itself~ rests on caissons embedded in bedrock.
Thus the ' diesel skid vibration transfer is through the foundation below the skid to the caissons.
The new instrument stands are located on elevation 436 floor adjacent to, but not a partiof, the diesel' generator skid.
5411150057 6
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- Mr.1 Harold cR. Denton
' Diesel; Generator? Vibration-November.8,;1984 a.
Page #2-The ' equipment that is now being movedL but'which previously.was
' located on the diesel skid, has never experienced any adverse performance effects c.s'a result of' diesel l vibration. ~ However,; by ilocating instrument standsioff the-skid u and? utilizing flexible -
connections' to 'the : stands, the potential L for any equipment -
failure due to operational stress 1vibrationJis1further reduced.
-These modifications are currently-being made=during:the present
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refueling outage.-. Upon' completion l of these modifications, SCEEG
- will consider that License Condition 2.C.19:for the Virgil C.
Summer Nuclear Station has been satisfied.
If you-have any questions, please advise.-
Very truly yours, 4
/
1 O. W.-Dixon, Jr.
AMM/OWD/gj cc:
V. C.
Summer C. A.
Price T.
C. Nichols, Jr./O. W. Dixon, Jr.
C.
L.
Ligon (NSRC)
E.
H.' Crews,:Jr.
K.
E. Nodland E.
C. Roberts R. A.
Stough W. A. Williams, Jr.
G.
Percival D. A. Nauman C. W. Hehl J.
P..O'Reilly J.
B.
Knotts, Jr.
Group Managers
- H.
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Shealy-
- O. S. Bradham NPCF File
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