ML20066E206
| ML20066E206 | |
| Person / Time | |
|---|---|
| Site: | Robinson  |
| Issue date: | 11/03/1982 |
| From: | Moore R AMETEK, INC. |
| To: | Deyoung R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| REF-PT21-82-738-000, REF-PT21-82-822-000 PT21-82-738, PT21-82-738-000, PT21-82-822, PT21-82-822-000, NUDOCS 8211120470 | |
| Download: ML20066E206 (7) | |
Text
a AIWI = T = K SCHUTTE & KOERTING DIVISION
- 2233 STATE ROAD, CORNWELL5 HEIGHTS, PA 19020 TELEPHONE: (215)639M TELEX: 84-5283 CABLE: SCHUTTE November 3, 1982 U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Attention: hfr. Richard De Young, -
Director of Inspection and Enforcement hO Subj ect : Carolina Power and Light Co.
II. B. Robinson Steam Electric Plant Licensee Event Report 82-005 Main Steam Check Valves Gentlemen:
Pursuant to the subject event we wish to report to you under the provisions of 10 CFR 21.
Judging from the Carolina Power and Light Co. report the valves had been modified. As a result of that modification the setscrews holding the rockshaft locked to the tail link loosened and, on one valve, backed out sufficiently to free the rockshaft which moved axially causing one end to disengage from its bushing.
The original configuration supplied for Robinson Station and similar valves supplied for other stations are so dimensioned that, should the setscrews loosen and back out, the shaft could not disengage from its bushings. Ilowever in many cases the amount of engagement would be materially reduced.
We have identified all of the installations which might be affected.
A list of them is attached.
l We are in the process of cautioning each of the listed owners about this situation and will provide each with procedural instructions covering the spotting of the setscrews into the shaft and staking i to prevent the setscrews from backing out. We have enclosed a copy of
! cach instruction and the form cover letter used to transmit them.
If you require more information relating to the matter please contact l
the writer.
Sincerely, AMETEK/Schutte S Koerting Division 8211120470 821103 PDR ADOCK 05000261 g* 'b* /)k # f8'/ 7 S PDR R. G. Moore, Proj ect Engineer RGM/ckb
Enclosures:
- a. Form Cover Letter,
- c. Installation List
e AMETEK SCHUTTE & KOERTING DIVISION
- 2233 STATE ROAD, CORNWELLS HEIGHTS, PA 19020 TELEPHONE: (215) 6396
, TELEX: 84-5283 CABLE: SCHUTTE Attention: Plant Superintendant
SUBJECT:
AMETEK/SSK DIV. S.O.
CUSTOMER 6 ORDER NO.
Gentlemen:
During an c'itage at Carolina Power and Light H. B. Robinson Station it was diteovered that setscrews which lock the tail link to the rockshaft on the main steam check valves had loosened. On one valve the rockshaft had shifted axially causing one end to disengage from-its bushing. A modification to those valves resulted in a dimensional configuration (which was not as originally supplied) which allowed the shaft to drop out of the bushing. Should the setscrews loosen in an unmodified valve the shaft would remain engaged however the amount of engagement would be materially reduced.
If your valves have been or will be modified or repaired in this area the setscrews must be spotted into the shaft and staked to prevent their loosening. Procedures for accomplishing this are
! attached. Please insert them in your maintenance manuals and apply them when performing maintenance on the subj ect equipment.
Note that the instructions indicate in the application list with an
'X' which of your valves are affected.
In addition to the above precautions you may wish to replace the valve shaft with one sufficiently long to prevent its becoming disengaged from the bushings. Setscrews will still be required with this shaft.
Should you wish to pursue this option, please contact Ah!ETEK/Schutte 6 Koerting Division.
Sincerely, AMETEK/Schutte 5 Koerting Division i
R. G. Moore, Proj ect Engineer i
RGM/ckb Enclosures t
INSTALLATION LIST MAIN STEAM ISOLATION VALVES AND MAIN STEAM CHECK VALVES UTILITY STATION LOCATION Northeast Utilities Connecticut Yankee Haddam Neck, Connecticut l Carolina Power 6 H. B. Robinson Hartsville, South Carolina Light Company Florida Power 6 Light Turkey Point Dade County, Florida Company Omaha Public Power Fort Calhoun Omaha, Nebraska District Duquesne Light Co. Beaver Valley Shippingport, Pennsylvania Wisconsin Public Service- Kewaunce Kewaunce, Wisconsin Corp.
Northern States Power Co. Prairie Island Welch, Minnesota Florida Power'6 flight St. Lucie Hutchinson Island, Company Florida WEDC0 Indian Point Buchanan, New York Pacific Gas 6 Electric Co. Diablo Canyon Avila, California P.GM/ckb 11-3-82
i
..n ..... u. Y 6 2 G- O /3/ V
\ COMPAHE 9 gju H E VISIONS g stje: l DRAWING *~* /d g ygr p gg, 3* F IL ME D lt lH l UI SC HIPIlON lOAgt l APPHOVED) g: c- / n.g i t.i 322W ' """" '2 $)
/ / .f ROCKSHAFT REPLACEMDIT s#
3 M/ (jb x1 :
NALF Do6 POIN7* SETSC(REW i 1. REMOVE HALE DOG Po!NT SETSCREW (t* SETSCREWS) PART !.
f) ~Q-- ' . O'g g x[a ,' g g g gjC s!
TA/L l /MX A St.
j L~
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- 2. ATTALH SLINC To " LINK AND DIF ASSENBLY" TilkN RDt0VE 80CESHAFT PAAT 2.
l ~Q l DISC AND LINK ASSLMblY IS THEN NUtOVED Fkitt BODY.
8 gock'SNApy* py; 2 4 WITil A SMALL D#IIL (* CENTER PUNCH MARK THE SHAPT VHEEE THE SETSCREW OR SETSCREWS WI1J. BE IFCATED.
5.
m / 6.
RDt0VE 1HE SHAFT AND CRill TIIE SPOT e'R SPOTS FER SKETCH #2.
PUT " TAIL LINK AND DISC ASSEMBLY" IN THE VALVE AND INSERT SHAFT INTO LINK. LINE UP CHUNTER-DRILLED H01.E IN SHAFT WITH SETSCREV h0LE IN LINK.
- d f*f
- f PUT THE HA!E DOC POLNT SETSLDEW IN AND TIGHTEN IT. STAKE THE p
'k TOP T11 READ ABOVE TtiE SETSCREW (2 P! ACES) TO KEEP THE SETSt1tEW
= M Fu(H BACKINC UUT.
7 IF A SHAFT IS Ri}iOVED F(E INSPECTjuN AND FOUND TO BE SATISFACTURV FOLLOW THE ABOVE Pk0CEDUkES AT REASSt}tBLY.
SA'E TCN / PARM'RAPH 6 IS MANDATt*Y FUN (*1GINAL UK NEW SilAFTS.
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