ML20024G540
| ML20024G540 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 02/04/1974 |
| From: | Skovholt D US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Mayer L NORTHERN STATES POWER CO. |
| References | |
| NUDOCS 9102120628 | |
| Download: ML20024G540 (3) | |
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Fr. L. O. Mayer, Director l
of hucIcar Support Services 414 Nicollet 11:11 l
Miuncapolis, Mirviccota $5401 L(3ti m o.
RE: License No. DPR-22 the Legulatory ataf f 's review of reactor power plant safety fastlades consideration of postulated spent fuel shipping cas.k drop accidents.
'Ihese events most be adequately doctmented and analyzed by licensees and s;iplicants and evaluated by the staf f.
Foscible damare that could o r e.r t o plara t f. t ru c t u rcu, 6ys t ete, An d componcu ta it;po r Lan t to s a f e t y in tr.c event of a caul drop caused by a failure in the crane system or her. cline, dovico twt be evaluated. Our review of the USAR for the tscility(s) indicateu that the probability of damare from these postu-i Inted evetito hr.r. not been explicitly addressed and evaluated.
Uc rec;ucst t. hat you provide ua with analyses and other relevant infor-l mation needed to deteratine the possible damage in the event of a cask crop caused by a system failure and whether design or procedural codi-i ficatic,ns would be appropriate to reduce the probability of occurrence.
For the faellity(s) havinc both the fuel transfer cast and fuci shipping l
casi, both casks should be evaluated. Areas of particular concern whieb shutdd cc included in your evaluation are the following:
1.
Interrity of the arent fuel storage pool - If the cast (s) should drop while being handled over the storage pool, would the pool floor be damagect to the extent that. makeup capability could uot be assured or resultant flooding could cause critical systems to L e cer c. in:>pc rtd It ?
J.
ipeut Iual inte;;rity - Gan the cast (s) be positiuued near spent i
t fuci so that a cask can drop on the spent fuel or be dcFlected onto the sr.cnt fuci if it should hit a pool edre?
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Integrity of critical systes.s and equipment - In moving the cask (s) through the building, to or frou the fuel storage pool arca, does it pass over systems or equipuent ireportant to safety which could be dan. aged by a cash drup! ' Ibis consideration must include the capahl.11ty of the floors to protect equipment or systees important to safety which are located below the floor.
4.
Description of the handling equipment for the spent fuel eaak -
provide a description of the crane f acilities currently installed in the plant, indicating desisu conditions to which they were designed. the tests that have been performed on the senses in accordance with accepted code procedures and describe the f actor of safety that you believe to exist in the current crane systen.
1 articular attention should be given to control braking varaus eu.ctrency holding breken that are currently installed. Evaluate the maximum stall torque of the erane ester and the espability of the brakes to preclude this torque beleg trememitted to the lead beiur lifted. Ivscribe any other protective featuras that are inmtalled that would prevent a two blocking situation from occurring o.. paid the loud be raised too hir.h. Also trovido a der.cription of all lif tint devicou a.uch au 611nto, hooks, rupes, and the attach-sento to the ri ont fuel cack(o).
If the results of your analysio indicate that chantee in the design of your fuel transfer cash or f tel shipping cask crane systens or handling devices are nacennary to protect plant structures, sys teus, or cocponents important to safety or to prevent opent fuel damage, please provide information on your plane to revice the design of your facility (s) or equipsient as required. We will need estinates of the schedula for design, fabrication, and inntc11ation of any rodifications found to be necessary. The report of your analyuis and any proposed u.odificationn should be submitted an un amendi,ent to the bafety Analysis I;cport by May 1,1974. One signed at.3 thirty-nine copies of the acnadu nt abould be provided.
Sincerely.
'17 n 1. ;
at Ictald J. Skovbolt Assistant Director for 0,eratitir Eecetore Directorato of Licet. sing e t, bW'- 11CXL })h! t'
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L'onald L. lielson, Esquire VI' and GC 1;orthern States Power Company 414 liicollet Hall Minneapolis, Minnesota 55401 Gerald Charnof f bitaw, l'ittiaan, Pot ta, tTwbridge 6 }'adden 910 - 17 th S troe t, 10. W.
Washington, D. C.
20006 llovard J. VoFo1, Esquiro Knitt.le I, Vogel L14 11our l'.xchante Bui.1 ding liinnenpolis, Minnesota 554L5 Steve Cadler, P. E.
2120 Carter Avenue Distribution ~
St. Paul, Minnesot a $5108 yD'ocket File AEC P!"
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/.u,16.t ant city Attorney RP Reading d4 7 Ci ty 1;cl1 Branch Reading St. I acl, !!ituiewta 55102 JRBuchanan, ORNL DJSkovholt, L:0R Ken Drugna TJCarter, L 0R 1:innes ota Pollution Control Agency ACRS (16) 193L U. County land B2 R0 (3) baseville, liinnesota 55113 OGC DLZiemann, L:0RB #2 Verren t., L wann, 1:. b.
JJShea, L:0RB #2 Secretary 61.xaeutive Officer RMDiggs, L:0RB #2 S t a t.
Iwparti:wnt of licalth SVarga, L:RP 717 Dela'cre Strect, S. E.
Minneapolis, Minnesota 55440 baidra S. Gardebring 1Y3) W. County Road B2 l a evill o, lunnetoota.%113 to tian,y
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