ML20148H140
| ML20148H140 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 04/17/1978 |
| From: | Burger A Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8011170300 | |
| Download: ML20148H140 (30) | |
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. Docket No. 50-29 v APRIL 1 7 1978 LICENSEE: Yankee Atomic Electric Company (YAEC)
FACILITY: Yankee-Rowe-p
SUMMARY
'0F APRIL 4,1978 MEETING CONCEPJ11NG EXPANSION OF-SPENT FUEL
-STOP, AGE CAPABILITY On April 4,1978 representatives of YAEC presented to the NRC staff their plan to modify the' spent fuel pool and related structures and systems. The plan would provide for long-terra spent fuel storage needs; achieve; an integrated solution to the cask handling accident;
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and accomplish general upgrading of the pool which may be required as part of the ongoing Systematic Evaluation Program (SEP) for Yankee-Rowe.
A list of attendees is attached.
[
As background. Yankee-Rowe's original spent fuel storage capacity u
accormodated 172 assemblies.
In December 1976, a modification was u
authorized that increased the spent fuel storage capacity to 391 assemblies. This capacity would be sufficient to meet spent fuel storage needs until about 1985.
During the F.ceting YAEC presented a phased plan to further expand the spent fuel storage capacity to satisfy storage needs until 1997, utilizinq a c' oubig-tier storage scheme.
A replacement structural d
frauework installed in the stainless steel lined pool would support a second tier of storage racks. The existing storage racks (consisting of assemblics of five element codules) would be used as the first tier. The second tier of storage racks would also consist of five element modules each supported at the top and bottom bf the second tier support framework. While the first tier modules are bolted together by tie plates, the second tier nodules would be sepdate units. The planned double tiered storage design would provide sufficient flexibility to allow top loading of the second tier storage
.raci:s with several feet of water shielding above the top of any fuel assembly noved into storage on the second tier.
It would also y
facilitate inspection of the stored fuel assemblies.
c THIS DOCUMEllT CollTallis V'y
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APRIL 7 m79 9
J The plan also provides for the installation.of a stainless steel o
liner in the spent fuel pool and a gated separation wall in the pool. The stainless steel liner would upgrade the spent fuel pool
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by significantly reducing the potential leakage of pool water. The gated wall section would physically separate the lined fuel storage area of the pool from the remaining pool area where cask handling would taketplace. Separation of the cask handling area and planned provisions for transferring the cask through a wall section of the fuel pool building in lieu of transfer through the roof hatches will significantly reduce the potential of a cask drop accident.
It would also obviate the need to modify the Yard crane to a single failure pro 6f crane since the cask would be moved close to the pool floor thus minimizing the consequences of a cr.sk drop.
3 The spent fuel pool area would be divided in half by installing a cofferdam and dewatered to facilitate the modification. Therefore construction could be perfonned in the dry part of the pool while the spent fuel inventory isremairim) submerged in the other pool section. The number of fuel elements that can be stored in this F
manner (225 elements) will be exceeded by June 1921.
Therefore, all spent fuel pool modifications that require draining of the water would have to be completed by that date.
^
YAEC presented the step-by-step installation procedure and the key event schedule for the cofferdam schene.
Yankee plans to submit by July 15, 1978, detailed design of the cofferdam and planned modifications. YAEC will make a separate submittal on the double tiered racks by September 1,1978.
ImC approval of the cofferdam and pool modifications is required by December 1,1978 to proceed with the upgrading of the pool, but approval of the double tiered storage rocks design is not required before September 1979.
In response to YAEC's request for guidance, we indicated that cofferdam and specific pool modification, and installation of the Liouble tier storage racks could be considered as separate licensing actions to accomodate the licensee's schedule.
As a result of our discussions of YAEC's plans to increase the storage capacity of spent fuel we indicated that the following should be specifically addressed in their initial submittal:
show that occupational exposures would bc limited E
as low as possible 1
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APRR 1 7 1978.
. the potential consequences of construction accidents
~ and any planned precautionary measures during the construction phase to preclude or mitigate the consequences of such accidents show that the spent fuel will always be under water
'during the construction period regardless of what happens to the temporary cofferdam
. demonstrate that the temporary inlet and outlet piping of the spent fuel cooling system will be reliable and e
that it will not be able to siphon the water out of the pool show that there will be redundant reliable sources of makeup water available for spent fuel cooling after an earthquake
. temporary storage of pool water during construction phase and assessment of consequences of total loss of this water structural reanalysis of first tier racks, even if they are not changed, to account for offect cups to be
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installed for restraining lateral motion of lower racks plans for field testing anchors used for restraining the pool linor tlith regards to YAEC's future submittal of proposed double tiered spent fuel storage scheme the staff comments as follows:
. upgrading of the pool design and the long term double tier storage provisions will be evaluated in accordance with the Systematic Evaluation Plan (SEP) requirements the analysis of the second tier structure shall account for gaps i
the inservice inspection access for exanining the upper and lower tiers of fuel and modules and the pnposed inspection program shall be described I
N y' AP P t '-
' 7 EB installation of a second spent fuel cooling pump should be provided for redundancy
. an analysis of the assumed worst caso rack drop accident and its effect on the grating which would be installed to protect the fuel assemblies in the first (lower) tier should be provided A. Burger, Project Manager Operating Reactors Branch #2 Division of Operating Reactors is
Enclosures:
DISTRIBUTION:
My 1.
List of Attendees Docket
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YAEC Handout NRC PDR d
Local PDR H
ORB-2 Reading NRR Reading l
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1 5-April 17,1978 0
ficeting Sumary for Yankee-Rowe q
ec w/ enclosures:
l E. G. Case
-V. Stello O. K. Grimes T. J. Carter i
D. Eisenhut H
R. Cudlin 1
J. Guibert-1 G. Lear n
R. Reid L. Shao t.
E. Adensam i _ ';
J. licGough 5
A. Schwencer D. Ziemann D. K. Davis hF
- 11. Butler
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R. Baer
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F. Burger
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Attorney. OELD OI&E(3)
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R. F. Fraley, ACRS (16)
I" T. B. Abernathy i-J. R. Buchanan J. fl. Donohew l-G. Bagchi i
E. Lantz l
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EflCLOSURE fi0. 1 i
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.1 MEETING WITH YAtlKEE ATOMIC ELECTRIC C0tiPAllY 9
APRIL 4, 1978 YANKEE ATOMIC ELECTRIC COMPANY _
P. D. Baughman G. Kingston J. W. Stacey flRC - STAFF A. Burger J. N. Donohew O. Bagchi J. Carter E. Lantz I'
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ENCLOSURE NO. 2 Section I Introduction i
This presentation discusses design modifications Yankee i
desires to make to the spent fuel pit and related structures, systems, and equipment at the Yankee Nucicar Power Station, Rowe, Massachusetts.
These modifications are planned to provide and fulfill requirements of both iong term spent fuel storage and design upgrading per the Systematic Evaluation Plan (SEP).
Below is an outline of the introductory comments to be made by the Proj ect Managor.
Int roductory, Comments 1.
Cask Handling Crane Modifications a.
Technical Submittal b.
Technical Spei;ifications c.
Schedule d.
Concerns 2.
Regional Spent Fuel Storage Facility a.
Utilities loss of full core reserve capacity b.
Schedule and Cost c.
Al t e rnat i ves 3.
Shipment of Spent Fuel to Existing Facility
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4.
On-Site Spent Fuel Storage Facility a.
Schedule 1
l b.
Cost c.
Licensing /SEP l
S.
Modifications to Existing Facilities a.
Licensing b.
Double-tier storage concept c.
Associated modifications d.
Methods of handling existing spent fuel inventory during i
construction (1)
Cofferdam (2) Transfer to Ion Exchange Pit c.
Schedule i
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,Section II Spent Fuel Pit dodifications The modifications planned for the spent fuel pit are:
a.
Stain 1 css steel liner b.
Gated separation wall Double-tiered spent fuel st.orage racks c.
Figures 1 and 2 show the spent fuel pit after installation of the above modifications.
The design modifications serve the following purposes:
Liner The stainless steel liner will upgrade the spent fuel pit te: ward more current design criteria.
It will significantly reduce the potential for Icakage of contained water during both steady state and upset conditions. The liner will be designed to maintain its watertight integrity during the design basis scismic and spent fuel shipping cask drop events.
No leakage detection capability is to be provided with the liner.
Since this liner is a backfit item, provision of leakage detection capability presents in unjustifiable complication in both design and installation.
Instead of leakage detection capability, thorough inspection of all stain 1 css steel welds will be performed to ensure a satisfactory state of leak tightness.
The liner will be installed only in the portion of the pit south of the separation wall.
This encompasses the entire pit solume designated for spent fuel storage.
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Cated' Separation Wall
- First, The gated separation wall will serve two basic functions.
it will physically separate the lined, fuel storage volume from the J
remaining pit volume where ultimate cask handling will take place.
Thus, in the unlikely event of a cask drop incident,.the wall will protect the spent fuel from the effects of a tipped cask. The wall-and liner together will protect against loss of watertight integrity of the fuel storage section f rom the ef fects of a cask drop accident.
Secondly, the separation wall.will permit the de-watering of the north end of the pit to permit preventative or corrective maintenance on the
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fuel transfer equipment.
Presently, such work can only be donc under-water.
The separation wall will be approximately one foot thick vnd will be constructed of structural steel and concrete.
A gate is to be of single provided in the upper one third of the wall to permit movement fuel assemblics from one side to the other.
The bottom of the gate fuel channel will not extend t elow the top of the upper tier spent Braces willbe require I to be installed on either side of the elements.
gate whenever the north end of the pit is de-watered.
Since these braces would interfere with fuel handling operations, they are to b'c removed whenever the spent fuel pit is completely filled.
The bracca are not required for any scismic support of the wall.
11-2
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' t Double-tiered Spent Fuel Storage System The current maximum spent fuel pit storage capacity utilizing
, reduced spacing, f xed poison (Boral) curtain racks is 391 spent fuel i
This capacity will permit plant operation until January 1984, elements.
without loss of full core reserve.
Current assessmcat of the availability of future off-site repositions for spent fuel indicate that provisions for additional on-site storage capacity shculd be made which will permit plant operation into the mid 1990's.
The doubic-tiered storage system to be proposed will at least double the present capacity of 391 elements. This increased storage capacity will support continued plant operation until approximately 1997 without loss of full ccre reserve.
The double-tiered storage rack system is shown in Figures 3 and 4.
Existing storage racks are to be utilized on the first tier.
Presently, these racks are free-standing.
In the double-tier system, restraining lateral cups would be installed in the floor of the pool liner to prevent movement (sliding) of these racks.
A structural frameworx will be provided to support the second tier of storage ' racks. This framework will be sttached to the floor and two adjacent walls of the spent fuel pit and will straddle the first tier storage racks.
All support loads of the second tier fuel storage will be assumed by this framework; therefore, no cecond tier
' loads are assumed by the first tier racks.
11-3
The existing storage racks, to be used on the first tier, are assemblies of five-element modules.
Various numbers of five element modules are bolted together by means of top and buttom tie plates.
Since the five element module is the basic component of the existing storage racks, it is planned to use this module as the basic element of the second tier of storage also.
The second tier of storage racks will consist of an array of individual five element modules, each supported at the top and bottom by the second tier support framework.
Unlike the storage rack assemblies of the first tier, the five element modules of the second tier will not be joined by bolted tieplates.
Because of this design, actual storage of fuel on the second tier need not commence until the mid 1980's, when the first tier is completely filled.
Furthermore, only as many second tier, five element modules need be purchased as are needed from outage to outage.
This design concept was chosen, in part, to minimize the commitment of funda for long tern storage which might be precluded by future impicmentation of a Federally mandated spent fuel storage program.
In storing spent fuel on the second tier, a sufiicient number of empty five-element modules will be placed in the second tier support framework.
Then, spent fuel assemblica will be individually top-loaded into the storage containers.
Sufficient water depth exists in the spent fuel pit to permit top loading of the second tier storage racks without uncovering any portion of the !;e1 assembly.
In fact, the final design is expected to result in several foot of water shielding above II-4
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the top of a-fuel assembly being moved into' storage on the recond j
tier.
Preliminary dose rate calcu3ations indicate t; hat a vertical ~
oriented spent fuel assembly with only 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> of decay shielde 3 feet of water produces a surface dose rate of less than 16 This design provides the flexibility to relocate spent
- elements as necessary to minimize water surface dose rates provide for required inspection of any spent fuel assembly in inventory.
O 11-5 i
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1 A redundant sealing system is planned not only for purposes of safe guarding the stored spent fuel but also to achieve the dryest conditions possibic on the work side.
During construction, with the cof f erdam installed, water level l
above the spent fuel is to be lowered to the minimum practical level.
This level will be sufficiently high to both maintain adequate radiation shielding and keep the spent fuel covered in the event of cofferdam seal 1
failure which results in water behind the cofferdam equalizing i
1evel with the dry side.
i The cof ferdam would be designed to withstand the hydrostatic force l
of the water at the operating level established for the construction period.
Shielding of the werk area will be provided by either water gap or supplementary lead shielding or both as necensary.
Success of the cof ferdam scheme depends, anong other things; upon timing.
The limiting spent fuel inventory that can be accommodated by this approach is 225 elements.
This will be exceeded in June 1981.
Therefore, if this approach were carried out, all spent fuel pit installation work requ2 ring a de-watered work area should have been completed by that date.
Several major movements of both spent fuel and the cofferdam would be required during the course of this project. The basic installation sequence is as follows:
111-2
Section III Alternative Installation Approaches This section addresses two alternative approaches for installing These are:
the design modifications discussed in Section II.
I.
Use of a cofferdam in the spent fuel pit fuel in the Ion Exchange II.
Temporary relocation of the spent l
Pit Alternative I_
Use of a Cofferdam f
In order to install the desired modifications to the spent fuel pit, it is necessary to de-water the work area.
By using a cofferdam which divides the spent feel pit roughly in half, the design modifications Construction can proceed in one can be installed in a two-step process.
half of the pit while the spent fuel inventory is retained in the other half.
It is The key structure in this scheme is the cofferdam itself.
built of structural steel metaberc and spans the entire width of the spent fue.1 pit at a location slightly north of center.
It is J
walls.
completely support ed by means of guides bolted to the pit alleviates the necessity for bracing which would This type of support prese nt conside rable interf erence to conctruction in the de-watered zone.
111-1
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1 Step 1 (See. figure 5)
- Place stored spent fuel in two groups at either end as shown
- Install cof ferdam supports and liner center segments Step 2 (See Figure 6)
- Locate all' spent fuel at north end
- Establish north end cooling service
- Install cof ferdam and seals
- Lower water level and de ater south end
- Perform construction in south end
- Re-fill south end and restore normal pit water Icvel Step 3 (See Figure 7)
- Re-establish south end cooling service
- Ec-locate spent fuel in south end
- Lower water level and de-water north cnd
- Perform construction in north end
- Re-fill pit to norraal water level
- Remove cofferdam Step 4 (Sec Figure 8)
- P3 ace stored spent fuel into two groups at either end as shown
- Remove cofferJam Supports
- Connect rack support structure between north and south ends Step 5
- Arran;;c first'tfer spent fuel racks into final confiruration 111-3
l The above basic installation sequence must interface with 1
plant refueling outage periods. The following preliminary schedule
- indicates the timing of key events for the entire project, based upon the currently projected plant outage schedule.
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C_OFFrRDAM SCllT.!!E KEY TNI.TT SCIIEDUI.E Conceptual Desir,n of Cofferdnm began March 1, 1978 Int roductory !!cet inn with NRC April 4, 1978 Yankee Board of Directors MeetInc.,
April 14, 1978 Commence Detailed Design per authorization April 15, 1978 of Yankee Directors Detailed Submittal to flRC on Cofferdam July 15, 1978 and planned modifications Accomplish f uel re-nrrangement of Step 1 Detailed Submittal c a erning double-Sept emho r 1,1978 tiered racks October 24, 1978 Plant outage; spent fac1 inventory increases to 189 cicments December 1,1978 liRC approval for cof f erdam and pool December 15, 1978 design modifteations (liner, etc,)
Install cofferdam; complete Ste n 1 and 2
!;RC approvai of double tier storage Septenber 1979 racks i
Plant out age ; spent fuel i nve n t o r!,
April 1, 1980 increar,es to 225 elemento May 15, 1980 l
Compic*c Steps 3, 4, 5 Plant outage; spent fuel inventory 1
June 1981 increases to 265 elements Plant outage ; spent fuel inventory September 1982 increanen to 301 elements r i.m t out.me; opent fuel in n' o r<
j
.lanuary 1964 incre,w r to 34) eler.nts.
- i. et loot.eu tull core rese rve c.ep: b!! t y.
Au p,us t 1036 Install first modules on second t ic t 117-5
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AlternafIvo 11 Teypora_rv Rolocation of Spent Fuel to the Ion Exchanje Pit The ion exchange and spent resin storage area in a corerete walled, water filled pit located fr: mediately south of the spen t f uel pit.
It is utilized'to store vertical, cylindrical stainless secol containers which house ion exchange resins and filters used in various plant systems.
The north mont row of containers houses ion exchangers or filters actually in service and connected to the pf ping of various systems.
The remaining aren of the pit is occupied by containers of npent resin, filtern, and other material awaiting ultimate dinpocal.
This alternative approach would utilize the ion exchange pit as a temporary locat ion for spent fuci during the installation of modifications to the rpent fuel pit.
The major advantage of t his cheme in that it permito removal of all spent f uel f rom the spent fuel pit and complete de-wat e ring of t he enti re pit while installing the liner, separatJon wall, and doable-tie r st ora;;c rack r,upport f ran.ework.
A cotr.pletely de-fueled and de-wat e red npent fuci pit provid'
,oe opt.imm,. w irk condition under which int.tallation of the desired moJIfications can proceed.
A r,tect t onk could be construct ed and innta11ed in the north section of t ho lon e >.rhan; e pit.
Approximately 60 percent of the floor upace of the pit vonid be occupied by this tank.
Exist ing spent resin containen,
.u.d other
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removed to make room f or this tank.
It would not be necessary, however; to disturb the on-service ion exchangers located against the south wall of the pit.
The temporary t ank would be designed to provide suf ficient water depth for radiation shle] ding durinc, both f uel transfer and normal storage.
A horizontal meann of transfer through the common wall between the spent fuel pit and ion exchange pit would be provided using appropriate f uel handling equipment.
A typical arrangement of fuel handling equipment is shown on l'1goren 9 and 10.
The spent f uel pit hullding supe rstructure would be er. tended, under this scheme, to incl ude the temporary tank.
This would provide a closed, ventilated enclosure around both spent fuel storage. pits whenever required.
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