ML20040C450
| ML20040C450 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 11/16/1981 |
| From: | Nichols T SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-SSINS-6820 IEB-81-02, IEB-81-2, NUDOCS 8201270658 | |
| Download: ML20040C450 (5) | |
Text
r.
.=
m.
c USNRC REGION SOUTH CAROLINA ELECTRIC a gas CosA'NbI/, C EC Y POST OFMCE box 764 COLUMBIA. south CAROL 1NA 29218 T. C. NicHOLs, Ja.
Novenber 16, 1981 81 NOV,
yact Fats DENT Amp GROUP Entcutevt
-..o.-~.
REctovgo Mr. James P. O'Reilly, Director JAN 261982b U. S. Nuclear Regulatory Oxunission 6
egg j
Region II, Suite 3100 menassasy,
/
101 Marietta Street, N.W.
9 Q
Atlanta, CA 30303 m
Subject:
Virgil C. Sumer Nuc -
tion Docket No. 50/395 IE Bulletin 81-02, Supplenent 1 and Reportable Substantial Safety Hazard on Westinghouse D4D 6, 8,10, 12, 14, 16 and 18 Inch Valves Re: Westinghouse 3" Gate V. ve Closure Ietter to NRC dated Novenb'r 25, 1980 Westinghouse 4" Gate Valve Closure Letter to NRC dated March 12, 1981 Westinghouse 3" and 4" Gate Valves Letter to NRC dated July 7,1981 IE Bulletin 81-02 Letter to NRC dated July 7,1981 Mestinghouse EMP 6, 8, 10, 12, 14, 16, and 18 Inch Valves Letter to NRC dated July 30, 1981
Dear Mr. O'Reilly:
IE Bulletin 81-02, Supplement No.1, " Failure of Gate Type Valves to Close Against Differential Pressure," required identification and action taken or planned for Westinghouse Electro-Mechanical Division 6, 8,10,12,14,16, and 18-inch naninal size valves in addition to 3-and 4-inch valves Ireviously subnitted. Table 1 tabulates the required information for each of these additional valves. We following corrective action was identified and parformed on each valve as follows:
x Torque Switch Adjustment y Gear mange z 'Ibrque to Limit Closed Final documentation changes are being processed.
m is letter also serves as the final report on the subject additional valves and follows up on the South Carolina Electric and Gas Company notification to the NRC Region II on June 30, 1981. An interim report dated July 30, 1981, was transmitted as referenced above.
O!$$$$h5 SEus),
4 4
Mr. James,P. O'Reilly November 16, 1981 Page 2 e
Should there be any questions or additional information desired, please give us a call.
Very truly yours, y f,. /
x
+
T. C. Nichols, Jr.
PMC:TCN:lkb Attachment cc:
V. C. Stener G. H. Fischer T. C. Nichols, Jr.
H. N. Cyrus O. W. Dixon, Jr.
D. A. Nauman W. A. Williams, Jr.
R. B. Clary O. S. Bradham A. R. Koon Site OA H. Radin M. N. Browne G. J. Braddick B. A. Bursey J. C. Ruoff J. K. Skolds J. B. Knotts, Jr.
H. T. Babb I&E (Washington)
Document Management Branch (55e, 21, LER only)
NPCF File
TABLE 1 Max.
P As Flow Approaches Zero Its Valve Valve Systs Service Equipnent Functional Consequence of No.
Type Abbrev.
Description Specification.
Requirement Failure to Cloce 1*
ICV 115 4GM72FB CS VCT Outlet 200 100
'1w valves in series; failure C, E of either valve to close reduces redundancy of
~
providing isolation.
2*' Y'
- ICV 115 80472FB CS NST to Charging 200 200 One MN in each of two B, D Ptmp Suction parallel paths frm the RWST to suction of the charging ptmps; Failure reduces redun-dancy of roviding isolation I
of NST during the recircula-tion phase following a postu-ICCA.
Isolation will be pro-vided by a check valve in series with the two paths.
3*' Y' *8130 A, B 8Gi72FB CS Charging Pump 200 200 Same as Item 1 Suction Header Separation, MELB 4 *' Y' Z8131 A, B 80472FB CS Charging Pump 200 200 Same as Its 1 Suction Header Separation, METE 5
8808 A, B, 12GM88FNH SI Accumulatory 2750 0
Valve is closed to trevent RCS C
Discharge pressurization during cold shutdown operation. If the valve fails to close, the accmulator may be depres-surized by venting the N to 7
the containment atmosphere
TABLE 1 Max.
P As Flow Approaches Zero Iten Valve Valve Systm Service Equipnent Functional Consequence of No.
Type Abbrev.
Description Specification Requirement Failure to Close 6
8809 A, B 14G174FE SI RWST to RIR 700 100 Valve is closed for recir-Pump Suction culation phase following a
'postualated LOCA.
If valve fails to close, backflow into INST is prevented by a clock valve 7
8811 A, B 140174FDI SI Containment 700 100 Valve is opened for recir-Sump to RHR Pump culation following a pst-Suction ulated IOCA. Valve would be closed for containment isolation. Valve is encap-sulated within a protective housing which acts as a redundant containment isolation 8'*
8812 A, B 14GM74FE SI Contaiment Sump 700 100 Valve 8811A (B) is in series Y
to RIE Plunp with 8812A (B), and is Suction redundant.
, 9*
8887 A, B 10GM74FE SI Iow Ilead Inject-700 300 Failure of valve to close ion Crossover reduces redundancy of pro-Line viding low heal train separation during cold leg recirculation phase following a postulated LOCA. Train separation can be achieved by closing the other valve.
e I
TABIE 1 Max.
P As Flow Apches Zero Item Valve Valve Systen Service Equipnent Functional Consequence of No.
Type Abbrev.
Description Specification Requirement Failure to Close i'
10 -
8888 A, B 10C478FN SI Irw Head Injec-2750 200 Valve is closed for switchover tion frcun cold leg to hot leg re-circulation. Failure of valve to close will degrad flow to hot legs.
l 11 -
8889 100478FN SI Iow Head Injec-2750 200 Valve is closed for switch tion over frczn hot leg to cold leg i
recirculaticn following a IOCA. If valve fails to close isolation is provided by closing the Mm discharge cross-connect valves 8887 A & B.
?'
- 8702 A, B 12GM88SEH Mm MR Inlet 700 700 Two valves in series; Failure j
Isolation, Inner of inner isolation valve to 1
close reduces redundancy of f
providing isolation.
Isolation is provided by closing the other valve.
13*'
- 8701 A, B 12CN88SEH MR ME Inlet 700 700 Same as Item 12 Isolation, Outer except for closing the inner valve.
14*
8706 A, B 8GM74FE MG ME HX to Charging 700 300 Valve is opened for Ptung Isolation recirculation phase following a postulated IOCA. Failure of valve to close precludes re-alignment of MIRS for normal operation
-