ML20009D835
| ML20009D835 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 07/07/1981 |
| From: | Nichols T SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| IEB-81-02, IEB-81-2, NUDOCS 8107240399 | |
| Download: ML20009D835 (2) | |
Text
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SOUTH CAROLINA ELEcmc & gas COMPANY POST OFFICE Box 784 CotuMelA, Soutu CAnoLINA 29218 h[g July 7, 1981t f
T. C. NicMoLs, Jn.
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Mr. James P. O'Reilly, Director
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j Region II, Suite'3100 101 Marietta Street, N. W.
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Atlanta,' Georgia 30303
Subject:
Virgil C. Summer Nuclear Station Docket No. 50/395 IE Bulletin 81-02 Re: URC Letter Dated 4/9/81 Nuclear Eng. File 2.8950
Dear Mr. O'Reilly:
IE Bulletin 81-02, " Failure of Gate Type Valves to Close Against Differential Pressure," required identification and action taken or planned for the subject valves at the V. C. Summer Nuclear Station.
Table 1 tabulates the required infor-mation for each of these valves.
Briefly, all 3GM38 type valves have received modifications to meet the 2750 nsi specification differential. As noted in Table 1, seven of these valves were modified, although the valve capability satisfied functional requirements. All 4GM88 type valves meet their functional requirement and do not require modification.
The key to interpreting Table 1, " Potential Safety Consequences," is as follows:
ID No.
Consequences 1.
(PORV Block Valves) Potential incomplete isolation of pressurizer PORV. This is not a safety issue per WCAP 9600.
(FSAR Se'ction 15..).
2.
Pote.. lal cavitation of a centrifugal charging pump or safety injection pump due to operation beyond maximum runout flow.
3.
Potential inability to perform post accident containment isolation.
4.
Potential degradation of safety injection flow below values given in SAR.
5.
Potential inability to isolate RCS pressure boundary.
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ih 8107240399 810707 PDR ADOCK 05000395 G
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- w Mr. James P. O'Reilly July 7, 1981 Page Two Should there be any questions or additional information desired, please give us a call.
Very truly yours, f
g T. C. Nichols, Jr.
RMC:TCN:glb Attachment ec:
V. C. Summer w/o att.
G. H. Fischer w/o att.
T. C. Nichols, Jr. w/o att.
H. N. Cyrus
- 0. W. Dixon, Jr.
D. A. Nauman W. A. Williams, Jr.
R. B. Clary O. S..Bradham A. R. Koon A. A. Smith H. Radin M. N. Browne l
H. E. Yocom B. A. Bursey J. L. Skolds j
J. B. Knotts, Jr.
l Dr. J. Ruoff i
R. M. Campbell l
.I&E (Washington) l Document Management Branch (55e, 21, LER Only)
NPCF File r
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