ML18037A358
| ML18037A358 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 07/28/1981 |
| From: | Dise D NIAGARA MOHAWK POWER CORP. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8108040118 | |
| Download: ML18037A358 (94) | |
Text
REGULAiTORY I FORMATIONi DtISTRIBUT'ION SYS M (RIDS)
ACCESSIONi NBR:8108040]18, DOC.DATKts 81/07/28 NOTARIZED:.NO DOCKEiT' FACILis50'20 Nine~ Mile> Point Nuclear Stationi i Und t" ig, Niagar aI Powei 05000220 DISEUR AUTH',NAMEi'UTHOR'FFIL'IATION D"e P"s Niagarai Mohawk< Powe'ri NAMEl RECIPIENT AFFILIIATION Corp'ECIP
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K'ISENHUT'g DOG, Division of Licensing SUBJEC'T's: Forwards info'e. control of heavy loadsi in response'o NRC.
801222' 810203 requests;Main h'andling sys include re'actorI bldg, overhead 'trave:ling crane<auxiliary 8 overhead- hoistsA S~
DISTRISUTION CODES A033S" C PIES'ECEIVEDILiTR 'NCI.IZE': 'Q Ra'actor TZTLEh'bnrtol of Heavy Loads Ne'ar Spent Fuel (USI A 36) Operat7ng, NOTES's:
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NIAGARA MOHAWK POWER CORPORATION/300 ERIE BOULEVARD WEST, SYRACUSE, N.Y. 13202/TELEPHONE (315) 474-1511 July 28, 1981 Mr. Darrell G. Eisenhut, Director Division of Licensing U.S. Nuclear Regulatory Commission aUG @tI >~II>
Washington, D.C. 20555 ~gsust++,t.(g Re: Nine Mile Point Unit 1 Docket No. 50-220 qp /g DPR-63
Dear Mr. Eisenhut:
Your letter of December 22, 1980 as amended on February 3, 1981 requested information regarding the control of heavy loads at Nine Mile Point Unit l.
The attached information addresses your request.
Very truly yours, NIAGARA MOHAltK POWER CORPORATION 8~8~
Donald P. Disc Vice President Engineering DPD:bd Enc.
8108040118 81072 PDR ADQCK P 05000220,~
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Niagara Mohawk Power Corporation Nine Mile Point Unit 1 Docket 50-220 DPR-63 Control of. Heavy Loads COntrsl ~ 8<>8<<
REGUlNORY DOCKET FILE COPY
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I. Introduction By letter dated December 22, 1980 from Mr. D. G. Eisenhut, licensees were requested to review controls for the handling of heavy loads. The results of thi s .review are to be reported in two parts.
This submittal is the review of the controls of heavy loads at Nine Mile Point Unit 1 relative to Section 2.1 of Enclosure 3 to the Commission letter.
The remainder of the report will be supplied, as required, by September 22, 1981.
II. Discussion Section 2.1(1)
Re<euest Report the results of your review of plant arrangements to identify all overhead handling systems from which a load drop may result in damage to any system required for plant shutdown or decay heat removal (taking no credit for any interlocks, technical specifications', operating procedures, or detailed structural analysis).
~Res onse The main handling systems at Nine Mile Point Unit 1 are the reactor building 125 ton overhead traveling crane, the reactor building auxiliary 25 ton hoist, the reactor building one half ton overhead hoist, the turbine building 150 ton overhead traveling crane with 35 ton auxiliary hoist, the reactor building jib crane and two 1 ton hoists on the west and south side of the refueling bridge. Of these systems, only the reactor building 125 ton and 25 ton hoists have been identified as handling loads over systems required for plant shutdown or decay heat removal.
Section 2.1( 2)
~Re uest Justify the exclusion of any overhead handling system from the above category by verifying that there is sufficient physical separation from any load impact point in any safety related component to permit a determination by inspection that no heavy load drop can result in damage to any system or component required for plant shutdown or decay heat removal.
~Res onse The 150 ton turbine building crane with the 35 ton auxiliary hoist is used for maintenance of the turbine generator. There are no systems required for plant shutdown or decay heat removal within, the pickup area of the turbine building crane. However, if the turbine floor were breached by a load drop, it may cause damage to safety related components. Niagara Mohawk is currently evaluating this postulated load drop and will report the results by September 22, 1981.
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The reactor building jib crane is a semi-portable cantilever circular movement electrically controlled one-half ton hoist. The jib crane can be set up on any one of four setup areas on the refueling floor. These setup areas are near the corners of the spent fuel pool. The diameter of the pickup area is 15 feet which precludes handling of loads directly over the reactor core or any safety related component.
The two refueling bridge 1 ton hoists are used for handling of core components such as LPRtls and control blades. The travel path of the refueling bridge is limited to the core and spent fuel pool. However, since core components weigh less than fuel bundles, damage from dropped components would be within the results of the fuel drop analysis in the Nine bile Point Unit 1 Final Safety Analysis Report.
Section 2.1( 3)
~Re uest llith respect to the design and operation of heavy load handling systems in the reactor'uilding and those load handling systems identified in 2.1-1, above, provide your evaluation concerning compliance with the guidelines of NUREG 0612, Section 5.1.1. The following specific information should be included in your reply:
- a. Drawings or sketches sufficient to clearly identify the location of safe load paths, spent fuel, and safety related equipment.
- b. A discussion of measures taken to ensure that load-handling operations remain within safe load paths, including procedures, if arly, for deviation from these paths.
- c. A tabulation of heavy loads to be handled by each crane which includes the load identification, load weight, its designated lifting device, and verification that the handling of such load is governed by a written procedure containing, as a minimum, the information identified in NUREG 0612, Section 5.1.1(2).
- d. Verification that lifting devices identified in 2.1.3-C above comply with the requirements of ANSI N14.6-1978, or ANSI B30.9-1971 as appropri ate. For 1 i fting devi ces where these standards, as supplemented by NUREG 0612, Section 5.1.1(4) or 5.1.1(5), are not met, describe any proposed alternatives and demonstrate their
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equivalency in terms of load handling reliability.
- e. Verification that ANSI B30.2-1976, Chapter 2-2 has been invoked with respect to crane inspection, testing and maintenance. l]here any exception is taken to this standard, sufficient information should be provided to demonstrate the equivalency of proposed alternatives.
- f. Verification that the crane design complies with the guidelines of CNA Specification 70 and Chapter 2-1 of ANSI B30.2-1976, including the demonstration of equivalency of actual design requirements for instances where specific compliance with these standards is not provided.
- g. Exceptions, if any, taken to ANSI B30.2-1976 with respect to operator training, qualification, and conduct.
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Response Attached are sketches used at Nine Mile Point Unit 1 for movement of
- a. heavy loads. Figures MPl.l-l through MP1.1-12 govern removal of the reactor head cavity plugs, the large canal shield plugs, small canal shield plugs 10 and 11, the drywell head, and the curtain shield support structure. Figures MP1.2-1 and MP1.2-2 govern removal of reactor head insulation and reactor. Figure MP1.3-1 governs removal of the steam dryer. Figures MP1.4-1 through MP1.4-3 govern removal of small canal shield plug no. 9 and the steam separator, and installation of the portable radiation shield. Figures MP1.5-1 through MP1.5-3, MP1.6-1, MP1.7-1 through MP1.7-3 and MP1.8-1 through MP1.8-12 govern the reversal of the above removals when the components are being installed. The sektch identified as Figure 5A is used for movement of spent fuel casks from the hatchway to the spent fuel pool cask drop protection system, and out again.
Procedures for handling LPRM's, new fuel and control blades will be revised prior to their next use in the spring of 1983.
Load paths are not marked on the operating floor, since these would only confuse the crane operators.
Response The figures provided in response to a above are used in conjunction
- b. with maintenance procedures and fuel handling procedures to assure safe load paths are followed.
Other heavy loads, such as new fuel and packages and control blades with packaging, are moved in accordance with procedures which specify that the fuel pool area and safety related equipment should be avoided. These types of heavy loads are not normally moved when the reactor building plugs are removed. These administrative procedures provide adequate assurance that damage to plant shutdown and decay heat removal systems is avoided.
Response Provided below is a list of the heavy loads normally moved on the C ~ refueling floor at Nine Mile Point Unit 1, the associated procedure governing its movement, and identification of lifting devices. These procedures comply to NUREG 0612 Section 5.1.1(2), except that the safe load path is not marked on the refueling floor . These procedures are available at the Station. Figure 3 shows the location in which all loads are placed and their weights.
Designated Removal Installation Lifting Procedure Procedure Device Shield Plugs (Except No. 9) MPl .1 MPl. 8 S-l, S5A*
Drywell Mead MP1 .1 MP1.8 Drywell Mead Lift Ass.
Curtain Shield Support Str uc ture Mpl .1 MP1.8 Drywell Head Lift Ass.**
Rx Mead Insulation gl MP1. 2 Mpl .7 4 point sling Reactor Head Mpl . 2 MP1.7 Reactor Head Lift Ass.
Shield Platform MPl . 2 MP1.7 Drywell Head Lift Ass.
Steam Dryer hIP1. 3 MP1.6 Steam Dryer 8 Seperator Lift Ass.
Shield Plug P9 MP1.4 MP1.5 S-5A Portable Radiation Shield MP1.4 MP1.5 Briddle Hitch Steam Separator MP1.4 MP1.5 Steam Dryer 8 Separator Lift Ass.
LPRMs FHP 26 4 point sling New Fuel FHP 6 4 point sling Control Blades FMP 20 4 point sling llaste Debris Shipping Casks FHP 16 Cask Yoke
- S-1 is used for plugs 1 through 5, S-5A is used for the remainder.
- Modified with 4 turnbuckles Response Niagara Mohawk is in the process of verifying that the lifting
- d. devices used at Nine Mile Point Unit 1 meet these requirements.
However, we do not expect final resolution until September, 1981.
Therefore, Niagara Mohawk will report on the issue in September along with the remaining information required by the December 22, 1980 letter.
Response The reactor building cranes at Nine Mile Point Unit 1 are classified
- e. as cranes not in regular use per Section 2-2.1.4 of ANSI B30.2.0-1976. Therefore, inspections are performed before each use.
This inspection incorporates the necessary requirements of Chapter 2-2 relative to preventative maintenance.
Response As stated in Section III A.2 of Niagara Mohawk's letter from
- f. Mr. P. D. Raymond to Mr. Donald J. Skovholt dated July 26, 1973, the redundant hoisting system at Nine h1ile Point Unit 1 complies with CMAA Specification 870-1971 and ANSI B30.2.0-1967. Since the crane was designed prior to 1976, it may not be in complete compliance with the 1976 version of ANSI B30.2. Niagara Mohawk is currently investigating this and will report the results of our review by September 22, 1981.
Response Niagara Mohawk has in place a lesson guide which is used to train
- g. crane operators. The intent of this lesson guide is to assure proper and safe operation of floor operated over head cranes in accordance with ANSI B30.2-1976.
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