ML19308B696
| ML19308B696 | |
| Person / Time | |
|---|---|
| Site: | Crane, Davis Besse  |
| Issue date: | 09/24/1977 |
| From: | Roe L TOLEDO EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| TASK-TF, TASK-TMR 391, NUDOCS 8001160750 | |
| Download: ML19308B696 (4) | |
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. I EXHIBIT D LL File: 0017,0486, M-36
'.D, Tetroo October 11, 1977 i.iGSDN LOWEtt E. ROE Serial No. 391
%ce Pres.d.as
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84108 250-324.?
Docket No. 50-346 OAvis BSCSe.
Mr. James G. Koppler 8TMRD Regional Director, Region III 8
Office of Inspection & Enforcement U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137
Dear Mr. Keppler:
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,This, letter : super ~sedes my,fle-~~w:w~ r~isubjecttdatedLoctober;m tter toi wmn"=vww~m
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you;on(this 5
Jn_accordance,with10CFRPart,21.21,(b),,thisisa{reportiof;afdefec.tdin(
my mmm-w.,
'a compf,ncatainstalled;inithe,Davistnesse. Nuclear, Power, Station Jnir No.
Thecomponentinvolvedisthe* governor 2onthe;auxiliaryjoed[ pumps.
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The auxiliary feed pumps were supplied by Byron Jackson Pump Division.
2::'h,1 The steam driven pump turbine was supplied by Terry Corporation to Byron In turn, the turbine governor was supplied to Terry Corporation QN Jackson.
E Q* j by lloodward Covernor Company.
r The turbine g:,vernor is identified as a type PG-PL, which has a' servomotor control employing a Bodine Electric EEMce:3 Company motor.
.%.._ ~~ _.,,_,,,_._.,._- _._ _ _,_ _.(The: defect (involves,apotential:for5thegovernortob
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4 E5iidli386sliid'pEYEiiEisg thTtiirb'liiffionoiiiih7dp"tidesign speed.
The operating procedures for this equipment called for the governor to k"(%
be placed in the high speed stop position prior to shutting down the turbine.
Investigation has shown that with the Bodine servomotor driving
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against the high speed stop, a misalignment force is applied to the T-bar of the governor linkage. This misalignment force creates a potential for fg the governor to bind at a speed position less than design speed upon a turbine startup.
This misalignment force does not always cause the governor to bind and this misalignment force can be removed by driving the Bodine servomotor away from the high speed stop.
The safety hazard which could be created is the potential for both auxil-lary feed pumps to fail to como up to design speed upon startup.
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This could result in a substantial loss of auxiliary feedwater flow to the secan generators when such flow was required.
This in turn could cause significant reactor coolant system pressure / temperature transients, and 9
significant boiling in the reactor coolant system if substantial decay heat were present in the reactor core.
7 16601sh tle i tv.swJ t ge.TaNY CCO4 PL/.71 300 MAME.J AvrNtJr TCt FCO. 04:0 * *O?
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The evaluatinn and identification of this defect ~was provided to me on September 30, 1977, and was ~ discussed with Mr. T. l!arpster 'of your of fice on September 30, 1977.
There are two identical auxiliary feed pumps with the turbine governors, described above", installed in the Davis-Besee NucJear Power Station Unit '
No. I '.
The corrective action taken was to modify the governor including the removal of portions of the pneumatic speed-setting mechanism to assure that the governor will properly respond to speed demand signals.
The pneumatic speed-setting mechanism was never an integral part of the functioning of the governor, because the governor employed servomotor control.
This modification was a,ccomplished at the k*oodward Covernor Company facilitics.
Subsequent testing at these facilities has proved the proper functioning of the governor. 'The modifications were completed prior to the current unit startup., The governors have been tested for proper functioning on auxiliary steam, and the surveillance test will be completed during Mode 3 of the current startup.
Yours very truly, Vf[h4 C~ (7 '
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A Lowell E. Roe Vice President Facilitics Development db b/9-10 bec:
P. M. Smart. Esq.
C.
Charnoff, Esq.
D. II. Ilauser, Esq.
W. A. Johnson J. S. Grant
-E. C. Novak C. R. Domcck /
J. D.Lenardson
-J.-C.
Evans
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R.
Rosenthal
. P. P. inas
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A. H. Lazar
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EXHIBIT E E.
Historical Log of Station Ooerations (September 24 - October 28)
Sept. 24 Reactor critical at 15% power, generator on the line at 110-140 mw, performing controls tuning i
1700 - Discovered steam leak on steam lead between No. 2 Turbine Control Valve and high pressure turbine 1830 - Turbine-generator taken off the line to repair i
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steam leak. Reactor critical at about 9%
power.
I t-2135 - Received Steam and Feedwater Rupture Control I
System Actuation, resulting in Reactor Trip, and Safety Features Actuation 2345 - Plant stable at 1800 psig, Tave + 525 F Sept. 25 0415 - Started Plant Cooldown 0645 - Completed initial survey of Containment Sept. 26 Cleanup and repairs begun Sept. 30 Completed repair and replacement of mirror insulation on No. 2 Steam Generator Oct. 3 Auxiliary Feedpump Covernors removed and sent to Woodward Covernor Factory l
I Quench Tank Rupture Disc replaced' f
Oct. 5 i
Vented Reactor Coolant System and run Reactor Coolant Pumps to get data to evaluate status of pumps and seals.
Oct. 6 Started Feedwater Cleanup in preparation for Reactor Coolant System heatup Oct. 7 1830 - Received NRC approval to proceed with plant startup Oct. 8 1530 - Checkout of Auxiliary Feedpumps (using Auxiliary Steam) completed Oct. 11 Attempted to test pressurizer power relief valve.
Unsuccessful due to electrical circuit problems.
Oct. 12
. Pressurizer power relief valve control circuit working, stroked valve and it stuck open again a
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.- p.
Oct. 13 Crosby' man on site again working on Power Relief Valve. ' Increased RCS pressure to complete testing of Reactor Coolant Pumps.
Oct. 15 Completed repairs to Power Relief Valve and tested it successfully Oct.-16 Completed testing of Auxiliary Feedpumps. Covernors had been modified by Woodward to prevent sticking 1306 - Reactor critical 2316 - Rolled the turbine Oct. 17 0307 - Generat,or synchronized 1135 - Generator off the line for overspeed tests 1805 - Commenced Reactor Shutdown for Unit Power Shutdown Test. We are now back in Power l
Escalation Lequence l-Oct. 18 0200 - Completed Unit Power Shutdown Test l
0300 - Commenced Reactor Startup lq 1036 - Generator Synchronized Oct. 19 1124 - Generator off line to repair steam leak between No. 1 Control Valve end HP Turbine Oct. 20 2241 - Generator synchronized-Oct. 23 1009 - A half trip of SFRCS caused low steam generator level, resulting in full SFRCS trip, Reactor trip and SFAS Oct. 27 2330 - Reactor Critical Oct. 28 1151 - Generator Synchronized I
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