ML20027E237
| ML20027E237 | |
| Person / Time | |
|---|---|
| Site: | 05000000, San Onofre |
| Issue date: | 07/12/1977 |
| From: | Head J SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| Shared Package | |
| ML20027A625 | List:
|
| References | |
| FOIA-82-394 NUDOCS 8211120288 | |
| Download: ML20027E237 (6) | |
Text
{{#Wiki_filter:- (. n: .:.y A,. ') l D F.ECEIVED t <9p JUL 22 g, a 30 6 t> July 12, 1977 p.s'"''"f Director of Huclear Material Safety & Safeguards U. S. Nuclear Regulatory Conraission Wachington, D.C. 20555 .f s /. Q' Y. i.'< ' Docket No. 50-206 l San Onofre Unit 1 .. FED .f ,,3 p g-!'. ) Gentlemen: O g sc.- The purocse of this letter is to report three ceparate occasions when the vent valve on the spent fuel shipping casks used at San Onofre Nuclear Generating / Station, Unit 1, was found open upon arrival at the General Electric Spent Fuel Storage Facility in Morris, Illinois. Submittal is in accordance with direction received from the Office of Inspection and Enforcenent, Region V, and the pro-visions of 10CFR 71.61. Identifying information on the three seoarate shipnents, where the vent valve was found to be open on arrival at the General E.lectric Spent Fuel Storage Facility, is listed in Table 1. Three different casks with the following 16enti-fication nu.Tbers are currently used to ship spent fuel at San unofre: NAC-IS, i&C-lC, HAC-1D. Station precedures used in preparing the casks for shiperent of spent fuel require that the vent valve be c1cse6 before offsite chip::ent. Check-off sheets associated with these procedures are used to document the fact that the vent valve is closed before off-site shioment of each cask. The cm.pleted check-off sheets for the three shiprents cited above show the vent valves to have been closed prior to shipacnt. ] As shown in the attached Figure 1, the vent valve is located on a 3/4" I.D. pipe which originates in the spent fuel cask cavity. Downstream of the vent valve (reference figure 2) a 1/2" quick disconnect cnap-tite valved coupler is attached to act as a hose c1crp when flushing the cosk cavity. A cover plate I with a gasket is used to ceal the recessed cavity containing the vent valve and encp-tite. Tne co::ponents of the vent valve are shown in ficure 3. Although the vent valve is considered a primary boundary, no significant contmination would be expected with the valve ooen. The presence of the sc.mstrea::: cnap-tite valved coupler, and the coverplate with gasket, would at 1 cast ninimize corrunication of the cask cavity with the environs. Addition-ally, cince the caskc are shipped dry, direct venting to the atzrosphere would not produce any aporeciable contarination ha::crd. 8211120288 '820928 i PDR FOIA i RAPKIN82-394 PDR P
p t 1 . An examination of the vent valves has suggested that the packing nay not have been sufficiently tightened. Eith a loosened packing, vibration during transit n.ay have caused the valves to cren. Since adjustrent of the packings, all casks have arrived at the General Electric Spent Fuel Storage Facility with the vent valves in the closed position. Spent fuel shipping procedures new recuire that the condition of the vent valve be ascertained prior to releasing the cask for shipment. Adjustrents are rade as necessary to assure that the packing is sufficiently tightened to n.iniraize the possibility of the valve roving to the open position during transit. Should you have any further cuestions regarding this matter, please contact re. Sincerely, ii l URIGINAL SIGfu l BY I (J. T. iiead, Jr) GFF/JCS:dno ( attachrents Director, Office of I'.r.nagement Inforr.ation & Program Centrol. cc: Director, Office of Inspection and Enforcerent, Region V. / i
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b*' c E s HANDLE NUT-~. -6 PIPE END HANDLE e BDDY Y STOP STEM SEAL ?
- CASKET S
b /t/! RETAINING NUT A O g r.b: Q t a-BELL. WASHERS'A / )g = SEAT ~ VIEW A-A FOLLOWER' ,/ ( s ' BODY NUT BALL 3 \\ PIPE END SEAT p BODY SEAL s BODY SE AL SEAT PIPE END j I \\ BODY o pTHRUST BEARING ^ /S \\g / 4 BODY BOLTy TO REPL ACE SE ATS AND SE ALS ON ADJUST ABLE STEM VALVES EtCNONb"eYT o"ENiPE tE' E. wlTM STEM IN CLOSED POSITION [ REMOVE OLD SE ATS, 8007 SE ALS, AND D ALL.
- 3. REMOVE M ANDLE NUT, M ANDLE, AND STOP F ROM $7EM.
- 4. U$tNG A mRENCH TO PREVE8si STEM FROM TURNING, RE MOVE ADJUSTING NUT FROM STEM. REMOVE ST E M THROUGM DODY C AvlTV.
CHECA AND CLE AN ALL SE ALING $URFACEg, {0WER AND STEM SE AL. S. E E
- 4. FL ACE THRUST ET ARING CN STEM AND INSERT THROUOM 800Y CavlTY.
AND DELLEVILLE WA5HERS IN PollTION. PL ACE STEM SE AL, STE M SE AL FOLL0wf R[ARING.) 7. ( ST EM SE AL IS T HICKER TH AN TMRUST B FOR STEMS WITM EL ASTOMER *0* RING 8E ALS* THESE ARE NO LONGER Avail APLE AND Amt REPL ACED ST THE ADOWE SE AL PACn ACE. ASSEMBLE AS DIRECTED ABOVE. AE5f *'RLE ADJU5f tNO NUT F AR ENOUOM 30 THE WRENCH M AT SE PL ACEis ON TOP OF ST E M TIGHTEN ADJUST.40 NUT TO MauE THE STE M $4UG AND FIRM E JrCE S5IVE TIGMT E NING ONLY CauSES MiOMER TORQUE AND SHORTER SE AL ElFE. 3 DE PL ACE STOP, H ANDLE. AND MANDLE aty? 04 STE M. wlTM STE M IN CLOSED POSITION. RE PL ACE S ALL Ano SE ATS. WITM l!E M IN OPE nE D POSITION, sN5ERT 3007 SE ALS AND PL ACE CENT E R SECTION BET etE N P6PE ENDS. NOTE
- W ME N RE PL ACING OPTION AL STAINt E SS S1E EL *S* GalsE T 900Y SE ALSEE ViEm h A.
TME WIDE FL ANGE IS PL ACED AGAINST 5001 OF TME WALVE. I REPL ACE BOOT Il0LTS AND NUT S AND TIGMTEN. g 10854-3 I L '.i e s e I -~ r e = i ngure_.No'..q3., e -}}