ML20050B989
| ML20050B989 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 03/29/1982 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Mcgaughy J MISSISSIPPI POWER & LIGHT CO. |
| References | |
| NUDOCS 8204070668 | |
| Download: ML20050B989 (3) | |
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DfSTRIBUTION:
lGR 2 S W F*LB#2 FileDocket Ffle;50.416/4173
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DEisenhut/RPurple RBosnak RTedesco CGraves ASchwencer bcc: PRC DHouston NSIC Docket Nos. 50-416/417 EHylton NRC PDR Wagner, OELD L PDR
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~8 Ol&E ACRS(16) q, Region II Hr. J.P. McGaughy
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RECEfYUU Assistant Vice President SHanauer Nuclear Production Z
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RMattson Mississippi Power & Lightgog 30 Iggg M HThompson P.O. Box 1640 RVollmer tw
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Dear Mr. McGaughy:
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Subject:
" Fast Scram" Hydrodynam c oads on Control Rod Drive Systems We were recently informed by a vendor of control rod drive (CRD) systems of a potential reportable condition applicable to boiling water reactors (Enclosure 1). Specifically, this vendor indicates that its analysis of the hydrodynamic loads in the piping and on the supports of a particular CRD system for a " worst case" condition resulted in structural loads which were larger than some of the previous design loads for this system.
These larger loads result from a rapid actuation of the CRD.
1 The conditions assumed by this vendor for its " worst case" calculation of the hydrodynamic loads were: (1) a design basis opening time of 20 milliseconds for the inlet line scram valve; and (2) a scram during the start-up phase of the plant with no pressure in the reactor vessel. The vendor also stated that its modeling of the CRD system may not be appro-priate which could cause the calculated hydrodynamic loads to be insuf-ficiently accurate.
This matter has been previously discussed with the members of ticensing l
Review Group II (LRG II). This group agreed to pursue this issue on their individual dockets. Accordingly, we will consider this matter to be an open item on your docket until we can resolve this issue.
Our concern in this matter is that the hydrodynamic loads in the CRD system for your facility may not have been properly evaluated. Accordingly, we request that you provide the following information for your facility:
1.
The design basis opening time for the inlet line scram valve.
2.
An evaluation of the hydrodynamic loads in your CRD system resulting from actuation of the inlet line scram valve using the design basis opening time specified in Item 1.
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A description of the conditions and configurations of the plant which result in the maximum hydrodynamic loads in the CRD system.
4.
A statement regarding the appr?priateness of the mathematical model used to calculate the hydrodynamic loads in the CRD system resulting from a scra:n.
5.
A comparison of the hydrodynamic loads evaluated in Item 2 with the present design basis loads for the CRD system.
In the event that the hydrodynamic loads calculated for your facility exceed the present design basis structural loads for the CRD system, indicate which components are affected and submit a proposed plan for structurally reinforcing the affected components.
Please indicate within 7 days of receipt of this letter, the date by which you can respond to our request,. If you have any questions on this matter, please contact the Project Manager, M.D. Houston, at (301) 492-8430.
Sincerely, ed A. Schwencer, Chief Licensing Branch No. 2 Division of Licensing
Enclosure:
As stated cc: See next page The reporting and/or recordkeeping requirements containod in this letter t.f fect fewer than ten respondents ;
therofcre, OE3 clearance is not required underP.L.96-511.8, DiY\\
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- ome, ARC FORM 318 (10-80) NACM 0a0 OFF1CIAL hECOaD C.OPY usam i,si-m-seo
Mr. J. P. McGaughy Assistant Vice President Nuclear Production
- Mississippi Power & Light Company P. O. Box 1640 Jackson, Mississippi 39205 cc: Roberc B. McGehee, Esquire
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Wise, Carter, Child, Steen and Caraway P. O. Box 651 Jackson, Mississippi 39205 Troy B. Conner, Jr., Esquire Conner and Wetterhahn 1747 Pennsylvania Avenue, N. W.
Washington, D. C. 20006 Dr. D. C. Gibbs, Vice President Middle South Energy, Inc.
225 Baronne Street P. O. Box 6100 New Orleans, Louisiana-70161 Mr. John Richardson Mississippi Power & Light Com'pany P. O. Box 1640 Jackson, Mississippi 39205 Mr. R. Trickovic, Project Engineer Grand Gulf Nuclear Station Bechtel Power Corporation Gaithersburg, Maryland 20760 Mr. Alan G. Wagner Resident Inspector Route 2, Box 150 Port Gibson, Mississippi 39150 J
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October 14, 1981
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' Director Office of In'spection & Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
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Subject:
A Potential Reportable Condition Gentlemen:
The purpose of this letter is to bring to the attention of your office ~and the other organizations listed on an attachment to this letter, a condition that Reactor Controls believes may present a potential Reportable Condition affecting-
_. safety of the Control Rod Dr ive_ Hydr _4ulic_.Sy. stem in the Boili_ng. Water Reactor.._.
plants for which Reactor Controls supplied portions of. the t.ystem. The item that causes-our concern is as follows.
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While performing the stress analysis of the piping and supports of the system for a BWR-6 unit, we were required to consider hydro dynamic loads To do so RCI requested the opening time of the Inlet Line Scram &lve. The reply stated 7# h the time to be twenty __millesec6nds. Using this opening time, the resultant ThTsTas_namic load reguired modif1 cations to the design of thQipe supports?o
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hydro dy there is no pressure in the reactor vesse1, resulting in a greater differential pressure from the accumulator.
At that time we thought that the " Fast Scram" fea.tur.e_of_thA_BWR-5_xas_introduc-in.g_a new load _conditi.on o.rtthe_syjstem. But upon further inquiry we have been informed by General Electric Company that the same valve opening time applies to earlier units of the Boiling Water Reactor also.
R E1Qr_ Controls.has.. fabricated and installed the piping and supports for many f
Control Ro(Drive HydraulTc Systsms and'deligiied_those--@~plirls w3.Otqu,t consider-F,n,.g_Eydrti Dyn'Efiloads-olie~'~tdThe scram function.
Our concern 3._that..this-additional load _.may. represent.a.potentialsafe,ty consid-eration for those plants whose design did not include it.
Consequently we Teel' TGi obligation is'to infirm yode ' office.~ByTopy of ~tliis letter we are also in-forming those utilities constructing or operating plants for which Reactor Co trols has provided portions of the Control Rod Drive Hydraulic System.
However we are also aware of, and wish to point out, that the Control Rod Drive i
Hydraulic System.has many years of successful operation at all plants without J110200176-811014 PDR MISC HESTER BLVD.
- SAN JOSE. CAUFORNIA 95128. (4o8) 246-3801 + TLX 34 6316 PDR ZE-2.A
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' October 14, 1981 Reactor Controls, Inc.
. ?aee 2 any reported, difficulties from this load. Our findings are the result of analysis using computer programs that may not parallel the system closely enough to repre-sent the actual condition. But we are taking the opportunity by this letter to infom you of the facts as we presently understand them.
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Very truly yours, G
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J C ice President
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REACTOR CONTROLS, INC.
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Reactor Controls, Inc.
Attachment -inge 1 Copies sent to:
Mississippi Power & Light Company Stone & Webster Engineering Corporation Post Office Box 756 3 Executive Campus Port Gibson, Mississippi 39150 Post Office Box 5200 Attn: Mr. George Rogers' Attn: Mr. C. Zappille Cherry Hill, New' Jersey 08034 Bechtel. Power Corporation I~/
15740 Shady Grove Road Send Letter to:
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Gaithersburg, Maryland 20760 John D. Leonard Jr.
Attn: Mr. Adrian Zaccaria, Resident Manager
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. Project Engineer Fitzpatric Nuclear Power Station Post Office Box 41 Lycoming, New York 13093 Philadelphia Electric Company 2301 Market Street Philadelphia, Pennsylvania 19101 Pilgrim Unit #1 Attn: Mr. M.J. Cooney Boston Edison Company Supt. of Nuclear Generation Plymouth, Massachusetts. 02360 Attn: Mr. Peter O'Brien h
,_ _,_.Bec tel Power Corporation.
. Vermont Yankee Post Office Box 3965 San Francisco, California 94119 Post Office Box 157
~ Vernon, Vennont 05354
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Attn: Mr. H.C. Morris Project Engineer Attn: Mr. Fred Burger l
QA Coordinator
. I Bechtel Power Corporation l
Post Office Box 3965 Millstone Unit #1 San Francisco, California 94119 Northeast Utilities Service Company J;
l Attn: Mr. R. Elias Post Office Box 270 Project Engineer Hartford, Connecticut 06101 Attn: Mr. Dick Werner LILCO.
Post Office Box 604 River Bend North Country Road Stone & Webster Engineering Corporation Wading River, New York 11792 3 Executive Campus
. Attn: Mr. W.J. Museler Post Office Box 5200 Cherry Hill, New Jersey 08034 Attn: Mr. C.G. White Coninonwealth Edison Company Contract Administrator Post Office Box 767 Chicago. Illinois 60690 l
Attn: Mr. B.R. Shelton Gulf States Utilities Company Post Office Box 2951 Beaumont, Texas 77704 j
Attn: Mr. -W.J. Cahill Sr. Vice President-RBNG i
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Attachment.Page 2
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Copies sent to:
Lacuna Verde Hatch EBASCO Services, Inc.
Georgia Power Cortpany One Jericho Plaza E.I. Hatch Nuclear Plant P h Jericho, New York 11753 Post Office Box 442
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i Attn: Mr. N.P. Singh Baxley, Georgia 31513
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4 Project Manager Attn: Mr. M. Manry Plarit Manager
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TVA-Stride
.E ;'., i Tennessee Valley Authority
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640 E. Connerce Union Bank Building
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Chattanooga, Tennessee 37401
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- Attn: Mr. J. Marcel Anderson
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Purchasing Agent
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.. Chattanooga, Tennessee 37401 fttn:. Mr. J. Marcel Anderson _ _ _
Purchasing Agent d
.y Cooper
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.:, Nebraska Public Power District 4
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- Post Office Box 499
. t *..g Columbus Nebraski 68601
..;.? -n' B Attn: Mr. J. Pflant
.i.'d.:'.y.' g;6. i Div. Manager of Licencing & Q.A.
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.>- c. Sec.:(,^.',g Iowa Electric Light & Power Company 1 Post Office Box 351
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Attn: Mr. Karl Meyer c:t RNp 'j..,.'s...(
Manager of Nuclear Licencing 2
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- f Carolina Power & Light Company)
P Post Office Box 1551 (M/C 7C3
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Attn: Mr. S.R. -Zinnermati
..d Manager of Licencing & Permits
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