ML20050B992
| ML20050B992 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 03/29/1982 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Davidson D CLEVELAND ELECTRIC ILLUMINATING CO. |
| References | |
| NUDOCS 8204070671 | |
| Download: ML20050B992 (3) | |
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Docket 1F11e : 50-440/4414
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ASchwencer bcc: PRC Docket Nos. 50-440/441 RECEIVED MDLynch NSIC
,2 MAR 3 01982b '
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Mr. Dalwyn R. Davidson OI&E 6
Vice President, Engineering g
Region III The Cleveland Electric Illuminating R.I.
P.O.. Box 5000 SHanauer Cleveland, Ohio 44101 RMattson HThompson
Dear Mr. Davidson:
RVollmer
Subject:
" Fast Scram" Hydrodynamic Loads 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.
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 Licensing Review Group !! (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 matten 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 infomation 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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8204070671 820329 PDR ADOCK 05000440 E. 6.......-.. ~
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2 Mr. Dalwyn R. Davidson 3.
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 appropriateness of the mathematical model used to calculate the hydrodynamic loads in the CRD system resulting from a scram.
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, J. Stefano, at (301) 492-9536.
Sincerely, s,
A. Schwencer, Chief Licensing Branch No. 2 Division of Licensing
Enclosure:
As stated cc: See next page
'The reporting and/or recordheeping requirements ccntained in this letter e.ff ect f ever than ten respondents ;
therefore. 02 clearance is not required under P.Ir.96-611. "
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- r Mr. Dalwyn R: Davids~cn Vice President, Engineering The Cleveland Electric Illuminating Company-P.O. Box 5000 Cleveland, Ohio 44101 cc: Gerald Charnoff, Esq.-
Shaw, Pittman, Potts & Trowbridge
. 1800 M Street,' N.W.
Washington, D.C.
20006 Donald H. Hauser, Esq.
The Cleveland Electric Illuminating Company -
P.O. Box 5000 Cleveland, Ohio 44101
?esident Inspector's O'fice U.S. N.R.C.
Parmly at Center Road Ferry, Chic 44081 Donald T. Ezzone, Esq.
Assistant Prosecuting Attorney 105 Main Street Lake County Admini.stration Center Painesville, Ohio 44077 Tod J. Kenney 228 South College, Apt. A Bowling Green, Ohio 43402 Daniel D. Wilt Wegman, Hesiler & Vanderberg.
7301 Chippewa Road, Suite 102 Brecksville, Ohio 44141 Ms. Sue Hiatt OCRE Interim Representative 8275 Munson Mentor, Ohio 44060 I
j Terry Lodge, Esq..
915 Spit:er Building
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Toledo, Ohio 43604 John G. Cardinal, Esq.
Prosecuting Attorney Ashtabula County Courthouse Jefferson, Ohio 44047 J
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v October 14, 1981 Q
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No;
~ Director Office of Inspection & Enforcement I*
U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Subject:
A potential Reportable Condition Gentlemen:
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The purpose of this letter is to bring to the attentiian 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 pod Drive _ Hydr _4ulic_.Sy.st.eal in the B.o_1.1.i_n.g Water. Reactor :--
plants for which Reactor Controls supplied portions of the system. The item that causes our' concern is as follows.
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 3 # N.;
RCI requested the opening time of the Inlet Line Scram Valve. The reply stated the time to be twenty milleseco~nids. Using this opening time,__the resultant hy.dro dynamic load required modiflcations to_the design of the y_1pe supports This was on tEliisis 6Fusin'g~fh 76FsY c~ase,"iWdurin'g"~a' start'ufscram'wfien there is no pressure in the reactor vessel, resulting in a greater differential pressure from the accumulator.
At that time we thought that the " Fast Scram" fe.a.tur_e_o.f_th.e_WR-6_xas introduc-1,n.g a new load _.conditi.co._on_the__s_y.s. tem. But upon further. inquiry we have been~
fnformed by General Electric Company that the same valve opening time applies to earlier units of the Boiling Water Reactor also.
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Rgaraqr_ Controls.has.. fabricated and installed the piping and supports for many
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Control Ro(Drive HydraulTc Sy3tems in~d del {giieiCihose s_u.ppoEtsMtJ1qut consider-17,g_ Hydro Dy0W1[loHs-dUe-to 'the scram function.
Ou r co ncern _ts._that.thi s addi tio nal. load _Inay _ rep res ent a.. pot ential s afe,ty_c,o nsi d-n eration for those. plants whose design did not include it. Consequently we feei' TJi 6bT@ition is to fnfonn yddF office'. By'-E6Fy of ~tlits letter we are also in-
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forming those utilities constructing or operating plants for which Reactor Con trols has provided portions of the Control Rod Drive Hydraulic System.
However we are also aware of, and wish to paint out, that the Control Rod Drive I
Hydraulic System.has many years of successful operation at all plants without Jt i n?OO176-8110 id' ' '
PDR MISC r4 ESTER BLVD. + SAN Jose. CAUFORNIA 95128 + (408) 246-3801. TLX 344316 PDR ZE-%A
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' October 1.4, 1981 Reactor Omtrols, Inc.
page 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 infonn you of the facts as we presently understand them.
Very truly yours.
s:
J C.
lett ice President REACTOR CONTROLS, INC.
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j Copies sent to:
Mississippi Power & Light Company Stone & Webster Engin2ering Corporation Post Office Box 756 3 Executive Campus Port Gibson, Mississippi 39150 Post Office Box 5200 Attr.: Mr. George Rogers, Cherry Hill, New Jerscg 08034 Attn: Mr. C. Zappille p.
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Bechtel Power Corporation _....
Send Letter to:
15740 Shady Grove Road Gaithersburg, Maryland 20760 John D. Leonard Jr.
Attn: Mr. Adrian Zaccaria, Resident Manager
. Project Engineer Fitzpatric Nuclear Power Station Post Office Box 41 Philadelphia Electric Company 2301 Market Street Philadelphia, Pennsylvania 19101 Pilgrim Unit il e
Attn: Mr. M.J. Cooney Boston Edison Company Supt. of Nuclear Generation Plymouth, Massachusetts 02360 Attn: Mr. Peter O'Brien Bechtel Power Corporation...__.
_. _ Vermont Yankee... _ _.. _ _. _ _.. _.. _ _ _.
Post Office Box 3965 San Francisco, California 94119 Post Office Box 157 Attn: Mr. H.C. Morris
~ Vernon, Vennont 05354 Project Engineer Attn: Mr. Fred Burger QA Coordinator Bechtel Power Corporation Post Office Box 3965 Millstone Unit #1 San Francisco, California 94119 Northeast Utilities Service Company Attn: Mr. R. Elias Post Office Box 270 Project Engineer Hartford, Connecticut CC101 Attn: Mr. Dick Werner LILCO.
Post.0ffice Box 604 River Bend North Country Road Stone & Webster Engineerine 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 Attn: Mr. B.R. Shelton Gulf States Utilities Company Post Office Box 2951 Beaumont, Texas 77704 Attn: Mr. W.J. Cahill Sr. Vice President-RBNG 5
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. Copies sent to:
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Lacuna Verde Hatch l
EBASCO Services, Inc.
Georgia Power Company One Jericho Plaza E.I. Hatch Nuclear Plant i" 5 Jericho New York 11753 Post Office Box 442
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3 Attn: Mr. N.P. Singh Baxley, Georgia 31513 4
Project Manager Attn: Mr. M ManTy 1
P) ant Manager
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-Tennessee Valley Authority 640 E. Commerce Union Bank Bu'ilding
.. Chattanooga, Tennessee 37401 Attn: Mr. J. Marcel Anderson Purchasing Agent
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.; Post Office Box 499 2
..:; Columbus, Nebraski 68601
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Brunswick
, 'te ' :""**w' Carolina Power & Light Company P
Post Office Box 1551(M/C7C3)
Raleigh, North Carolina 27602 u
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