ML20004F414

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Requests Approval of Use of Administrative Procedures to Restrict Handling of Loads Over Auxiliary Bldg.Limit Switches Will Be Used to Restrict Height to Which Loads Can Be Lifted,Pending Approval.Fee & Supporting Info Encl
ML20004F414
Person / Time
Site: Rancho Seco
Issue date: 06/12/1981
From: Bossenmaier W
SACRAMENTO MUNICIPAL UTILITY DISTRICT
To: Stolz J
Office of Nuclear Reactor Regulation
References
TAC-46519, NUDOCS 8106180314
Download: ML20004F414 (20)
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Text

{{#Wiki_filter:~ s q j\\ m THIS DOCUMENT CONTAINS P00R QUAUTY PAGES SACRAMENTO MUNICIPAL UTILITY DISTRICT C 6:01 S Street, Box 15830, Sacramento, Cahfornia 95813; (915) 452 3211 June 12, 1981 5 g O M I. & vq fj y-U c(- . t JUN 13199; w 'g. DIRECTOR OF NUCLEAR REACTOR REGULATION p.8. u iu = % r m M ATTENTION JOHN F STOLZ CHIEF ( / OPERATING REACTORS CRANCH 4 8 /h 9 \\,g Y U S NUCLEAR REGULATORY COMMISSION 7 UASH!NGTON D C 20555 DOCKET 50-312 OAT.CFO SEC0 ECLEAR GENERATING STATION UNIT N0 1 TOUER CRANE USE The Sacramento t'unicioal Utility District advised you by letter on November 26, 1950 of our intention to build three new buildings on the Rancno Seco Unit No 1 site. The first of these cuildings, tne Nuclear Service Electrical Builning, is cresently under construction. A tower crane has been erected cnsite to crovide tercorary liftinq capability 'or erec-ion of this buiidino. The crane consists of a 110 foot hign, four leg tower; a 125 foot, 3 mercer stayed jib witn 116 foot reach; a 54 foot occasinc counter balanced 3 rember stayed jib with an 18 kic fixed counter balanced at 46 feet; and an inclined jib tower 30 feet above the jibs succortino these stays. The District has cerfor ed a safety analysis to determine if use of tnis crane cens*itutes an unreviewed safety question as defined by 10 CFR 50.5?. This safety analysis considered wind and earthquake loadings, plant security, and oceration of the crane. This review has been concleted by both the Plant Peview Comittee and Management Safety Review Comittee. It has been determined that there are no unreviewed safety nuestions associated with the design of the crane or its imoact en plant security. However, the crane is located such that the hoist could be moved over the Auxiliary Building, includinq the control rocn, the nuclear service coolino water tanks, or the intake to the control room emer-gency ventilation system. Limit switches are not available to orevent hoist move ent over nese areas since trollev rovement would have to be restricted as a func-ion of ancular ro*ation of tne boor, cor this reason, it is ornrosed that administrative orecedures be relied ucen to restrict the handlina of loads over the Auxiliary Euilding. These adninis*rative procedures would be sinilar to those used to restrict roverent of loads by the pol 3r crane in the Contain-ent Suilding, or with several other cranes arnund the olant site. S106I8031Y 0 h

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\\- ,h c. JOHN F STOLZ June 12, 1981 Since it has been determined that reliance on administrative procedures does. create the possibility of an accident of a different type than any evaluated in the FSAR, we are asking for your approval for the use of the crane in this manner. Until approval is received, linit switches will be used to limit the height to which a load can ce lifted to prevent lif ting anything above the level of the control roon floor. Eventually, these linit switches will have to be removed to allow for completion of the buildino construction above this height. A cocy of the safety analysis described above is attached for your information. Also enclosed with this letter is payment of S4,000 for this review as required by 10 CFR 170. This request has been deternined to be Class III since the required approval involves a single safety issue. William S. Bossenraier Acting General Panaaer Enclosures

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s LW " 4 U ** ./ SAFETY ANALY${$ RANCHO SECO NUCLEAR GENERATING STATION UNIT N0. 1 A. m. ~n NCR. c'..',^..'. N. 0 0.' O.e *U r.(.T c c... S r. c. C R ? P M.. u* *l A ter.corary t:wer crane for the construc;ien of the Nuclear Service Electrical 3uiicinn /ECN A-I 501 is to be located at N 53-42 E 32-57. The :Wer c'2"e is a fised base "Pecco 1200" witn 110 Ft. nign, a le'; : wer,125 et. 3 ceN-stayed jib witn l'5' ralen, 5 Ft. Occcsinc ::unter balance 3 ember sta:,ec jib with 10 kn, fix. d 00unter 'salance at 26', and an inclinded ;ib :: war 30 Motors are Ounted above tre Ft. high above the jibs su::crtinc :ne stays. counter balances. Ocerat:r's c2d is richt side tander:.cunted on :ne ;ib 0 hori:en*al rotaticn swieel. The crane has a #ixed elevation fit wi*.n 350

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../.. - SAFETY FINDING The proposed. facility change.does not involve a change in Technical Specifi-cations or an unreviewed safety question. t l', t.icensing Engineer bh t __Cate; 9 b Review Engineer l-c. - Cate NOTE: Due to PRC c ncern, the followinc item has been identified for res;cese: Security concern to prevent the unautnoci:ed access to the roof of 1. the 'uxiliary Building by a :ersen lowering himself from the : wer crane beca during the internittant times, the unoperated crane becm extends over tne Auxiliary Building in its' weathervane mod 2. Since the t:wer crane is in full view of a ::ntinuously manned, adjacent, defensive ;csitien, the unau:ncri:ec climbing of the crane aili be under c:ntinuous surveillance ne same as the doors to the.3uxiliary "ad Turbine Buildincs, 'anc the stairway on the west side of the Turbine Bui~. ding. There will also be intermittant CCTV conitoring available in the C*S and SAS. c_ Cate sa Licensing Encineer -t s-u - - Review Er.cineer d, Cate W l e e

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r 1 i I I. . PURPOSE OF DESIGN CHANGE _ L To provide tercerary lifting capabilities to. erect the materials of c0nstruction fer the Nuclear Service' Electrical' Building by -the use of a tower crane. \\ II. DESIG1 CRITERIA USED The crane evaluaticn is based on the recuirements of the FSAR's which includes Section 5.1.2.1.5 with Apoendix 2B, 5.1.2.1.6 with Appendix 2.A.A, and A;cendix 5.A.85. Related criteria frem USC-75, AISC-85,.and f0r im;act, technical sections from " Design of Prestressed Ccncrete Structures: by T. Y. Lin, and " Dynamics, Part 2", by J. L. Meriam were useo in this analysis. Crane ccmponent data was taken j from supplier's. data provided in their "Pecco PC 1400 Mcdel" crane ' manual. Plant design drawings were used for. plant configuration data. NUREG C512 was reviewed and found to be not applicable. III. CALCULAT!ONS tND DESIGN INFORMATION A. Configuraticn i 1. The "Pecco 1400" :wer crane is an all steel trussed structure with fixed base. The tower is ccncesed cf 5 welded tubular four legged trusses boltad :: gather, sup; ort:d en a 2.5' Ft. thickl3.5Ft.scuarsreinforced c:ncrete foundation ?ad a Ft. celcw grade. The three legged " trolley" Jib and opposing platform counter-balance jib are horizentally pin connected j to the t wer mountec rotation gear and stay supported frcn an inclined vertical stay jib mounteo to the rotation assembly. The tower is 5.5 Ft. square and is 110 Ft. high. The stay jia is 30 Ft. hign. The 4-piece trolley jib 's 125 Ft. Icng with an effective reacn of 115 Ft. The trolley is powered for in-cut movement, as well as lift. The counter-tal:nce fib is 5a Ft. Iong with fixed 18.5 kip counter-balance at a6 Ft. j Motors are mounted above the counter-balance. The operator j cab is right tandum mounted to the rotation gear and below i jib level. A main power di connect is located at the base cf the t:wer. The base is located 57 Ft. scuth of the Auxiliary Building on the east side of the Nuclear Servier Electrical 5uilding constructicn site (N59'a2, E32+57). The weight of this crane-assembly is S3,000 pounds total. The crane has limit switches and safety break 3 for load limits, motor speed, trolley,.and c:ble travei. the location of the crane in relatien to surrounding plant t c. structures, places its trolley jib swing over parts of the CAS, Teol Roca Suiloing, and auxiliary Building, with its counter-balance jib swirig over the CAS and Auxiliary Build-j ing basament roof. 50tn fibs are substantially above any piant structure or projec-ion within its operation radius. 4 .. -. - - ~ , ~.., _. -,,

Y ^ U 3. . Strue: ural Evaluation i .1. Seismic lead: Calculations shewLthat-the t wer crane will not collapse ander the Cesign Base Earthquake leads as ce. fined in: FSAR 5.1.2.1.5, and Appendix 23. i 2. Wind: Calculations show that the tower trane will not collapse under the wind leading defined for the plant base in FSAR 5.1.2.1.6, and Ap;endix 2.A. 3. Tornado. Generated Missile Contribution: Calcula:: ens sn:c. that the tower crane will not generate any missiles greater than tnese analyzed in FSAR Accendix 5.A.55, wnich could contact any Class I ecuipment or system. The analysis sncv.s tnat under tornade winds in excess of 130 moh the tower cc:ne - would c0llapse to its ner:5-east cuadrant, im: acting the s u:h-east portion of. the :eact:r Building wall.and/cc the Auxiliary Suilding reef at elevati n 60' and 0.0', with secondary' # :ac: en tne south. wall of the Auxiliary. Building a: elevation 2:' to 0.0', and tertiary impac: en tne basement eccf. Thesa imccc:s were analy:ed using dynamic f or:e im:act fac:cred #:e s; ear.and kinetic energy-eiastic ~ absorption for mca.enton the structure. 10 failure was found in any area, therefore, nc 1' penetra icn, concrete spalling or structural distress would result.. The energy excenced by the imcacts is small ccm:are: to tnat of the operating tase eartncuake, therefore, forces cue to vibration from :ne im:act would be of no affect :: any internal Class I system er :encenent. The :ar:s cf the : rare were assessac as being of suf#icien:..e4;nt anc/cr at aca ea-as to not become a se:arate missile of a tyce not previ:;si, evaluated in the FSAR. i 4 Structure: The structure sad its ccreenents e.ere ccm:a-3:"vely. assessa: and rancem : mcenent calculati:ns were made.- 1c j design inade:eacies were f0unc. The ins tallation is to be cneckec, and the crane loac tested and certified oy a :nir; party ex:erienced in and licensed by the State-to perform suen work. The foundation soil was indeoendently tested and f:unc to.have a design bearing ca 3 city 5CE nigner than requirst. Placement of tne foun_2 tion and its materials. sere ins:e::e: by SMUD Q.C. There is no reason to doubt the structure's-capability to acequately and safely perform :ne work. C. C: era:icn i The sucolier's operaticn manual is to be strictly ccmolted with. The c: era *or is to be experienced, and have an acceptable Vital Security Clearance background check. No leads are to be carriec F over any plant structure, or trailer. The succlier's maintenance manual is to be strictly c molied w th, and 3 leg noting the i recuired maintenance and its performance is to be kept :y ine. . contractors 0. A. Engineer. The safety limit switches are te te in

X a::- 4 = ) c- ~ L a 1ccked cabinet, and the main power disconnect at the tcwer base is-to be kept locked in -the disconnect position during' non-working hours. Ke9s are.to be controlled by t:,e contractors [ Q A ; E1gineer. No operation of' the chane will be allowed in 1 ~ winds ahicnido not allow safe load handl.ing, and in no event in winds in excess'of,45 mph. All.0SHA -rules and regulations are_to be strictly comolied with. No use of the crare by the contractor will be allev.ed until the crane has been' certified by a_ third party licensed by. his state to cerform such work. O. Erection and:Disassemoly [ The crane-is to be assembled and disassembled in strict l l accordance with the surpliers assembly and disassembly manual. E The work;is to performed by a contractor experienced in this i work. A technical recresentative frem the supplier is to be present-during assembly. 1 -r l Y - l t I 1 I i O 'O

SACRAkiE!4TO MUf alC: PAL UTILITY OISTRICT . Pace af

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