ML20095H008
| ML20095H008 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 07/09/1984 |
| From: | Dixon O SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| IEB-84-02, IEB-84-2, NUDOCS 8408280287 | |
| Download: ML20095H008 (3) | |
Text
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SOUTH CAROLINA ELECTRIC & GAS ' COMPANY POST OFFICE 764 COLUMe A south CAROUNA 29218 84$4%9,P]l9p{g o.w.omON a.
VICE PntsIDENT NUCLeam OpenarioNS Mr. J.
P. O'Reilly, Regional Administrator U.
S. Nuclear Regulatory Commission Region II, Suite 2900 101 Marietta Street, N.W.
Atlanta, GA 30323
Subject:
Virgil C. Summer Nuclear Station Docket No. 50/395 Operating License No. NPF-12 NRC IE Bulletin No. 84-02
Dear Mr. O'Reilly:
On March 12, 1984, the Nuclear Regulatory Commission (NRC) issued IE Bulletin No. 84-02, " Failure of General Electric Type HFA Relays in Use in Class lE Safety Systems."
Licensees were requested to develop plans and schedules for replacing nylon or Lexan coil spool-type HFA relays, develop and implement surveillance plans, provide a basis for continuing operation and review the general concerns expressed in the bulletin for applicability to their facility.
With the issuance cf NRC IE Notices 81-01 and 82-13, South Carolina Electric and Gas Company (SCE&G) became aware of the Staf f's concern with the f ailures of General Electric (GE) HFA relays.
A subsequent investigation performed by SCE&G identified the utilization of HFA relays in GE supplied 7.2KV switchgear.
This was the only application of GE HFA relays in a class lE safety system at the Virgil C.
Summer Nuclear Station.
Action was taken to replace the HFA relays installed in the 7.2 KV switchgear with the new GE " Century Series" HFA relays.
The replacement of the HFA relays was completed on January 23, 1984.
HFA relays in non-lE safety systems are considered acceptable as installed and will not be replaced.
Additionally, the safety classification of all HFA relays, with the exception of the Century Series, has been downgraded for use in non-lE applications.
To ensure that the older and problematic HFA relays are not inadvertently used in class lE safety systems, the safety class and non-safety class relays are physically segregated and administratively controlled.
A review of the general concerns expressed in the bulletin was performed to determine if other relays used in safety-related applications had experienced similar failures.
A review of past operating history gave no indications of relay failures resulting 8408280297 840709 PDR ADOCK 05000395 G
PDR AN 'l 0
7 Mr. J.
P.
O'Reilly NRC IE Bulletin No. 84-02 July 9, 1984 Page #2 from degradation of component materials.
SCE&G, as part of an existing program, reviews manufacturers' technical information upon receipt to determine applicability and to initiate any necessary corrective action.
This program ensures that a proper evaluation of technical information is performed and documented.
As requested, SCE&G provides the following man-hour estimate for both replacing the HFA relays and subsequently preparing this response:
Approximately 600 Operations related man-hours which includes a visual examination, surveillance, tag-out of circuits and replacement of relays.
Approximately 135 Engineering related man-hours which includes a determination of affected equipment, visual examination, initiation of a modification package, procurement of materials and response to the bulletin.
I declare the statements and matters set forth herein are true and correct to the best of my knowledge, information and belief.
Should you have any questions, please contact us at your convenience.
r47 ry tfuly yours,
\\g
\\
lMb
(
4 ixon, Jr.
WRM/OWD/gj cc:
(see page #3)
- o Mr.'J. P. O' Reil'ly NRC IE Bulletin No. 84-02~
July 9,'1984 Page #3 cc:
V. C.
Summer K.
E.
Nodland T.
C. Nichols,-Jr./O. W.
Dixon, Jr.
R. A.
Stough E.
H. Crews, Jr.
G.
Percival E.:C. Roberts C. W.
Hehl W. A.
Williams, Jr.
J. B.
Knotts, Jr.
D. A. Nauman I&E Washington Group Managers Document Management O. S. Bradham Branch C.
A.
Price INPO Records Center D. A. Lavigne NPCF C.
L. Ligon (NSRC)
File I
4
,y
.