ML20113F423
| ML20113F423 | |
| Person / Time | |
|---|---|
| Site: | Hope Creek  |
| Issue date: | 01/18/1985 |
| From: | Mittl R Public Service Enterprise Group |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| REF-GTECI-A-36, REF-GTECI-SF, RTR-NUREG-0612, RTR-NUREG-612, TASK-A-36, TASK-OR NUDOCS 8501240014 | |
| Download: ML20113F423 (6) | |
Text
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e O I)#S G Company Pubc Serwce Electnc and Gas 80 Park Plaza, Newsrk, NJ 07101/ 201430-8217 MAILING ADDRESS / P.O. Box 570, Newark, NJ 07101 Robert L. Mitti General Manager Nuclear Assurrnce and Regulation January 18, 1985 Director of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue Bethesda, MD 20814 Attention:
Mr. Albert Schwencer, Chief Licensing Branch 2 Division of Licensing Gentlemen:
SUPPLEMENTAL RESPONSE TO HCGS SER OPEN ITEM 8 HOPE CREEK GENERATING STATION DOCKET NO. 50-354 The Hope Creek Generating Station Safety Evaluation Report, Section 9.1.5, states that the applicant must provide a discussion of the effects of a failure of a shield plug while it is being removed before refueling.
This request is supplemental to HCGS SER Open Item No. 8.
Public Service Electric and Gas Company hereby submits the attached as response to the request of SER Open Item 8 stated above.
Should you have any quest lont in this regard, please contact us.
Very truly yours, fy/
/
Attachment 8501240014 850118 PDR ADOCK 05000354 E
'300 i The Energy People g
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-Director of Nuclear Reactor Regulation 2
1/18/85 C.
- D.
H. Wagner:
USNRC Licensing Project Manager Mr..A. R. Blough USNRC Senior Resident Inspector
.ME.16.01/02 t
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ATTACHMENT 1
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' SUPPLEMENTARY RESPONSE TO SER OPEN ITEM NO. 8 (SER Section 9.1.5)
HEAVY LOAD HANDLING' OPEN ISSUE:
The applicant must provide a-discussion of the
. effects of a failure of a shield plug while it is being removed before refueling:
RESPONSE
Six reactorfwell shield plugs, four dryar-separator pool plugs, and five refueling channel slot plugs are handled on the-refueling floor during refueling.
- The crane, lifting devices,-and lift points associated with all the. plugs satisfy the single-failure-proof guidelines of NUREG-0612, Section 5.1.6.
Therefore, in accordance with the NUREG-0612 guidelines, a load drop need not. be postulated.
'All'of the plugs are comprised of reinforced concrete.
The slot plugs-and pool plugs are completely enclosed within a 1/4-inch stainless steel liner.
The reactor well shield plugs are enclosed on the sides with a stainless steel liner.
- Each reactor-well shield plug has four lifting eyes.
Each eye..is comprised of a length of fabricated I-shaped section
. embedded-2 ft.-3 in. into the concrete and provided with a shackle-pin hole at the exposed upper end of the web.
The
. embedded end of the lifting eye is welded to a 1.5 in. x 20 in. x 27.in. rectangular steel anchor plate.
The calculated factor of' safety, using.a dynamic load factor of 0.15, versus ultimate strength is 10 for the shield plugs.
Each pool ~ plug has four lifting eyes, and each slot plug-has "a single lifting eye.
The lifting eyes are stainless steel barsithat extend down through the-full thickness of the plug, and are welded to the liner at both the top and the bottom.'
The slot plug lif ting eye bars are 1.5 in. x 7 in.,
and-are embedded a distance of 3 ft. --11 in. (lower plugs) or 5 ft. - 3 in. (upper plug).,lThe pool' plug lifting eye bars are 2 in'. x 8 in., and'are embedded 4 ft. - 0 in.
(lower. plugs) or. 6 f t. - 4 in. (upper plug).
Each lifting eye.bar-is' anchored in-the concrete itself;by means of shear lugs..Two pairs of shear lugs are provided on ea'ch slot plug' lifting eye bar, and four. pairs of shear lugs are provided on each pool plug lifting eye bar.
The calculated factor of safety, using a dynamic load factor of 0.175, versus ultimate strength is 19 for the slot plugs.
Using a
- dynamic load factor,of 0.15, the calculated factor of safety is 17'for the upper pool-plug and 23 for the three lower pool? plugs.
t MP 85 20/03 1-mr I-
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/AllEof.t'e' concrete plugs handled during refueling are h
designed as structural elements to resist the design loads and loads induced by their handling systems.
~
~
LThefreactor well shield plugs are designed for the design structural-floor loads.
As described in FSAR Section 9.1.5, they are handled:by a single-failure-proof handling system along:a defined load path in accordance with a written procedure. ' The shield plug sling is a dual path special lifting / device.. It includes an equalizer to maintain. load
, stabilityf if one - of the four-lif ting eyes should fail.
Thus, a reactor well shield plug would not impact another
-structure as a result of a lif ting eye failure.
Each steel enclosed pool plug and slot plug is designed to support the load of the plug (s) above it and seismic inertial loads.
The pool l plugs are also designed to withstand the hydrostatic pressure from a 19 ft. water head.: As described in Section 9.1.5, the pool plugs and
-slot plugs are handled by a single-failure-proof handling system along a defined load path in accordance with a written procedure.
The-pool plug grapple is a single-failure-proof special
-lifting device as described in FSAR Section 9.1.5.3.2.5.
The concrete heavy loads. handled during refueling are listed in Table'l.for reference.
In summary, the single-failure-proof design of the handling
~
systems for the concrete heavy loads removed before refueling, together with their embedded lifting eyes with shear' lugs or - bearing plates, assures lif ting - eye integrity.
The steel liners, single-failure-proof handling systems,-defined load paths, and written procedures assure the integrity of the-concrete heavy' loads against failure.
during handling or impact on other structures.
The four lift points and lifting device equalizer provide additional-assurance of integrity for the reactor'well shield plugs and dryer-separator pool plugs.
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r MP 85 20/03 2-mr.
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'IABLE 1. CDNCRETE HFAVY URDS IRNDLED I1JRING REFUELING Number Lif t Point Single Failure Proof?
Load of Factor of Steel Weight Lifting Lift Safety vs.
Lifting Lift Encased Concrete Inad Quantity (tons)
Device Points Ultimate Crane Device Points Plug?
1.-Reactor Well Shield Plug Shield
- a. Upper middle 1
107.5 Plug Sling 4 10 Yes bs Yes No
- b. Upper outside 2
105.5 for all 4
10 Yes Yes Yes No
- c. Iower middle
-1 97.5 4
11 Yes Yes Yes Yes
- d. Lower outside 2
96.0 4
11 Yes Yes Yes Yes
- 2. Dryer-Separator Pool Plug
- a. Upper 1
53.0 shield 4
17 Yes Yes Yes Yes Pltig Sling
- b. Lower 3
38.0 Pool Plug 4
23 Yes Yes Yes Yes Grapple
- 3. Refueling Channel Slot Plug
- a. Upper fuel pool 1
6.9 Sling 1
19 Yes Yes Yes Yes
- b. Lower fuel pool 4
7.2 Sling 1
19 Yes Yes Yes Yes MP 85 20 03/3-mr