ML17194A304

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Discusses 811202 Telcon Re Diesel Generator Cooling Water Pump Operability.Confirms That Operability of Unit 3 Diesel Generator Will Be Demonstrated by Normally Required Surveillances.Ltr Supersedes 811125 Confirmation of Action
ML17194A304
Person / Time
Site: Dresden  
Issue date: 12/02/1981
From: James Keppler
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To: Reed C
COMMONWEALTH EDISON CO.
References
NUDOCS 8112080381
Download: ML17194A304 (22)
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Text

{{#Wiki_filter:UNITED STATES NUCL8t REGULATORY COMMISSION REGION Ill 799 ROOSE VE L. T ROAD GL.EN EL.L.YN, IL.L.:INOIS 60137 Docket No. 50-237 Docket No. 50~249 Commonweal th Edis.on Company ATT~: Mr. Cordell Reed Vice President Post Office Box 767 Chicago, IL 60690 Gentlemen: m .. c 2 t9s1 _. *

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,ff' This refers to the telephone conversation between Mr. K. R~ Baker and Mr. D. Scott and others of our respective staffs on December 2, 1981,* regarding diesel generator cooling water pump operability ~t the Dresden Station. With regard to the matters discussed, we understand that you ~ill declare the Unit 2/3 diesel generator cooling water pump operable with respect to fulfilling technical specification operability requi~eme~ts. Operability of the Unit 3 diesel generator will b~ demonstrated by normally required *surveillances and, additionally, by continuous operation of the Unit 3 diesel generator cooling water pump. Except during tests.which equire otherwise, you will continue to run the 2/~ diesel generator cooling ater pump.. Also, twice per shift, all operating diesel. generator cooling water pumps shall be inspected, and all non-operating diesel generator cooling water.pumps shall be vented. The inspection will include verification of acceptable pressures at the pump discharge and at the inlet and outlet of the diesel generator heat exchang~r for the operating pumps. If the Unit 3 diesel generator cooling water pump should trip for any reason, Unit 3 shall be placed in Cold Shutdown within 24 hours following discovery, unless the trip resulted from normal manual action or from an event that can be positively demonstrated to be unrelated to the events of October 23,* 1981 and November 19, 1981. These tonditions for opeiation of Unit 3 will re~ain in effect until you provide this office, in writing, either a description of circumstances that, with a high degree of credibility, accounts for the observed behavior of the Unit 2/3 and Unit 3 diesel generator cbolirig water pumps duiing the event of October 23, 1981, and the observed behavior of the Unit 3 diesel generator cooling water pump during the event of November 19, 1981, or you have provided alternate assurances that the probability of a similar event occurring has been significantly reduced and this matter is concurred in by this office. cVf ~TTACHMENT 3 CONFIRMATION OF ACTION LETTER

CONFIRMATION OF ACTION LETl'ER. . r.*.,. r ~~ \\~.. Co111110nwealth EdillOll Company..

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Thia lotter aupersedes.theConfirmation of Action Letter dated llovCmber 25~ 1981. Ple.aaa in;orm us immediately if you have any questions concerning** thica letter. .:;-}~'.~.iL.'.

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~.--.. :*.~-- Kacy Jo Murray, Office of*.. _ Assistant Attorney General*

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.. ~- Sincerely, '.~ I James G. Keppler Region.al Administrator* G!.:.p r'P .:~*.. 1c* .. *t**... ~ I*

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. /r \\ I, *eo *4 LOCATION: Dresden Nuclear Power Station DATE: TIME: Morris, Illinois Nov1Ylber Z411q g I IZ :o£p-m

  • J9 hereby inake the following volu~tary statem~nt to Robert M. Burton, who has identified himself to me as an Investigator with the United States Nuclear RegulatoryCo!nmission.

I make this statement freely with no threats orpromises of reward having been made to me. Investigator.Burton has had this statement typed for me at my request. I state I am employed as an Equipment Operator at the Dresden Nuclear Power Station and have held this position since December 3, 1979. On Friday, October 23, 1981, I relieved CEO ~.3 ! f at the start of iny shift (1500~2300), during which time he advised me that the Control Room wanted the 2/3 Diesel Generator Cooling Water Pump (DGCWP) started. I went to the Control Room and asked the Center Desk operator* (I *don't recall who it was) if he still wanted me to start the 2/3 DGCWP. The operator said no, but instead instructed me to go to the Unit 2 Motor Control Center (MCC 28-3), where electricians were conducting some tests and needed my assistance, apparently to do something with the breaker. On my way there and before arriving at the U-2 MCC, I received a call on the radio from the Center Desk and was instructed to go start the 2/3 DGCWP instead. As I proceeded to the 2/3 DGCWP switch location and be-fore arriving there, I again received a call from the Center Desk and was instructed instead to go back to the MCC and see what the electricians ATTACHMENT 4

wanted. .I arrived at the MCC and was advised by the electricians that they wanted the Unit 3 DGCWP started. I started the U-3 DGCWP as re-quested. I then received a radio call and was instructed to go to-the 2/3 DGCWP and start it. When I arrived at the 2/3 DGCWP switch panei,. I observed that the pump was already running. I asked the electrician i present (El~c.~4"°'~--.4ti),who started the pump. f.le.,.~1/stated the pump .. ~- *- *-*-- - was running when he arrived. I then asked him what he wanted me to do I . since the pump was already running. El&c. ~' called someone_ (presumably the Shift Foreman), apparently received instructions and informed me that I should secure both the 2/ 3 and U-<3 DGCWP' s and leave. I secured* both the pumps and left. \\ I I have read the forego*ing statement consisting of 2 typewritten pages. I have made and i_nitialed any necessary corrections and have signed my name in ink in the margin of each page. This statement is the truth to the best of my knowledge and belief. I declare under penalty or perjury that the foregoing is true and correct. - Executed on 11/z~/16 l atl'Z;v1p.fYl *.

  • Interviewee:

Subscribed and sworn to before me this Zt.frr: day of November, 1981, at Dresden Nuclear Power Station, Morris, Illinois. Investigator: @-i.vif /);{. &At;iu Robert M. Burton Witness: ~i1cvk.-/1M Jf)z ~. c ___)

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    • LOCATION:

Dresden Nuclear Power Station Morris, Illinois

  • DATE:

November lS, 1981 l TIME:

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i' I i I, E..O. *.3 ,. hereby make the following voluntary statement to Robert M. Burton, who has identified himself to me as an Investigator with . the United States Nuclear Regulatory Commission. I make this statement

  • freely with no threats or promises of reward.having been made to me.

In-vestigator Burton has had this statement typed for me at my request. I state I am employed as an Equipment Operator at.the Dresden Nuclear Power .l Station and have held this position since /O... i../-7{f

  • On Friday, Octa-*

ber 23; 1981, at approximately 2:20 p.m., I was instructed by the Center Desk Operator in the Control Room to start all three diesel generator (DG) cooling water pumps.

  • I started the pumps as instructed.

Approximately.20 minutes '\\ later, I was advised by the Control Room via radio that the el}t~icians (who were conducting amperage checks at the pumps), had advised the Control Room that the 2/3 DG cooling water pump (CWP) was not running. I was not advised that. there was a DG trouble alarm; something I would normally be informed of

  • if one occurred, and which should have occurred if the p~p had tripped.

The Control Room instructed that the 2/3 DG CWP be restarted. Because I was in the process of being relieved by the next shift at approximately 3:00 p.m., I did not personally restart the 2/3 DG CWP, but rather instructed* my relief man to do so. On Saturday, October 24, 1981, while conducting the.DOS 6600'-2 surveillance, there were no problems.

  • Cb. Sunday, October 25, 1981, we were again conducting a DOS 6600-2 surveillance
  • Between approximately 10:00 a.m. and 11:00 a.m. I started all.three DG CWP's.

Approximately 20 minutes later, during which time I was in the Shift Foreman's office, I was advised via radio by either the Nuclear Station Operator (NSO) or

  • the. "B" man, (who was taking vibration readings at the pumps), that the 2/3 bG CWP was not running *. I. i_nformed the Shift Foreman, : Sf Jl.:!>

) directly, that we were hav.ing trouble with the 2/3 DG CWP.

  • 5 F ~ 4- * <'l Shift Foreman~ and l SE a, 2.

/Shift E~gineer, were also in the room when I spoke with SF" ~.3. LL I SF ~J )instructed me to restart the pump. I returned to the DG room and ob-ser'Ved that 2/3 DG CWP switch indicator panel displayed a green light and a green flag. There were no audio or visual alarm indications on the 2/3 DG CWP switch indicator pa!lels. These conditions indicated to me that so_meone must_ h~ve manu-ally turned the switch lever for the 2/3 DG CWP to stop the pump. If. the pump had tripped off automatically, the audio and visual alarms would have been pre-sent, however, they were not. I restarted the 2/3 pump. and the "B" man apparently proceeded to take vibration readings after the required amount* of time. Subse-quently, the "B" man (who was in the intake room) contacted me via radio and in-formed me that he had finished with his readings. I then secured the pump. I - I _ subsequently called.the Shift Engineer's office, spoke to 5 F :tl3 ) and advised I. him everything was o.k. SF ='3 /instructed me to stop and start. the 2/3 pump a couple more times. I then started and stopped the pump 2 more times. Afterwards, I went up to Shift Foreman's office and. explained to SE. ~ 2 /what I had ob-served. SF's - 3 ~ -Al 4 ~ere also present in the room. I I have read the foregoing statement consisting of J tAfwritten pages. I have made and initialed any necessary corrections and have signed my name in ink in the margin of each... rhis statement is the truth to the best of my know-ledge and belief. I declare under penalty of perjury that the foregoing is true and correct. Executed on /{-/~ - g(

LOCATION: Dresden Nuclear Power Station Morris, Illinois DATE: *.November 24, 1981 TIME: 3 '(}_?// /r11 ( I, E \\e.c.t,-ic.\\~ ~ ~ J. hereby make the following voluntary statement to Robert M. Burton, who has identified himself to me as an Investigat?r with the United States Nuclear Regulatory Coniinission. I make this statement freely with no threats or promises of reward having been made to me. Investigator Burton has had this statement typed for me at my request. I state I am employed as an "A" Electrician at the Dresden Nuclear Power Station and have held this position for approximately 3 years. On October 23, 1981 at approximately i4:55, tlec..*.:2 /and I were directed to take amperage readings on the2/3 Diesel Generator Cooling Water Pump (DGCWP). We went to the Unit 3 Supply.Breaker at the Motor Control Center (MCC). We were informed by the Coutrol Room ()perator that the.0 2/3 DGCWP was running. When we arrived at the MCC and opened the breaker panel, I observed that the Motor Controller Contacts were open. We informed the Control Room Operator that the 2/3 DGCWP was not running. I Ele.c.. ~~ :' 1;

  • stayed at the MCC while I proceeded to. the 2/ 3 DG room to see why the pump was not running.

After arriving at the 2/3 DG room, I observed the 2/3 DGCWP Unit 2 Run Indicator (red light) for breaker 28-3 and the Unit 3 Supply (green light) for breaker 38-3. This indicated to me i:

  • that the 2/ 3 DGCWP was running and.* also explained why the Motor Con-troller Contacts in the Unit 3 Supply Breaker were open.

About then

i*'* E0~4 I /arrived and.asked me if I started the pump.

  • I told him that I did not start the pump.

I then notified ~fec.~~t the MCC to take amperage readings on the Unit 2 supply side. Those readings were with-in specifications. I believe we took the amperage readings for the U-3 supply later and were also within specification *. I have read the foregoing statement consisting of 2 typed pages. I have made and initic?.led any necessary corrections. and have signed IIiy name in ink in the margin of each page.* This statement' is the truth to the best of my knowledge and belief. I declare under penalty of perjury that the foregoing is true and correct. Exe.cuted on 11/z.'l/~1 at 3-:oD f*TY). .Interviewee~ Subscribed and sworn to before me this 2~Tlf day of November, 1981, at Dresden Nuclear Power Station, Morris, Illinois. Investigator 6fj/)b1;{-1J/ ~.) Robert M. Bur'ton Witness -->=~~- .. -+--{?~

-~l \\* -~:* Location: Date: 75? .. I 5 E ~ ! ,I hereby make the following voluntary statement to ~* 1J/. -~J who has identified bjmsel f to me as an Investigator with the United States Nuclear RegulatoryCommission. I make this statement freely with no threats or promises of reward having been. made to me. Investigator ~-, is ~inglwritjng this statement for me at my reguest.

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I have read the foregoing statement consisting. of .2 * ~-

  • h.andwritten/ty;:rerl pages.

I have made and initialed any necessary corrections and have signed my name in ink in the margin of each page. This statement is-the truth* to the best of my knowledge and belief. I declar7 e un~er penalt~ of perj~ry that the foregoin~ is true and correct. Executed on <<_10/f?I at I 7.58 ~ date

  • time INTERVIEWEE:

L I Subscribed and sworn to before me this '/OTft day of /Jo11£"1!!EE, 19~,

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.. *~**.. ~ lHVESTIGATOR: -~ 1Jf, ~ 1 ~AME: '/!o8EET )/. 8llfloty ' un~1Ess: ~*Cf.C *~- ~iruiE: <=<7 /<E~ JJ A. Co1Jl'JAu~.JYT0rJ

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-I LOCATION: Dresden Nuclear Power Station Morris, Illinois DATE: November 5, 1981 TIME: /~iZ) I, SF

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) hereby make the following voluntary statement to Robert M. Burton, who has identified himself to me as an Investigator with the United States Nuclear Regulatory Commission. I make this statement freely with no threats or promises of reward having been made to me. ln-vestigator Burton has had this statement typed for me at my request. I am employed as a Shift Foreman at the Dresden Nuclear Power Station in Morris; Illinois and have held this position since September, 1980. On October Z3, 1981, at approximately 0245 hours, I was notified of a diesel gerte~ator (DG) trouble alarm. I proceeded to the 2/3 diesel generator room to investigate. I arrived there the same time as. EC M-1 /and observ~d that the 2/3 diesel generator had tripped, the diesel generator high temperature alarm and the diesel generator cooling water pump (DGCWP) not running irtdication. I directed *Eo*1 i:o start the 2/3 DGCWP and observed pump running indication. I also observed that the number 2/3 diesel generator cooling water pressure on the inlet and outlet sides of ( the DGCWP heat exchanger was low. I directed EO t61t'o trip the 2/3 DGCWP and observed no change at the DGCWP pressure inlet and outlet of the 2/3 DG heat exchanger. SF' :ili ~arrived sometime after I did. We told Eoils 1 1 to stay in the DG room and SF :i 1. 'and I proceeded to the Crib House. After arriving at the Crib House, we visually verified the DGCWP suction

.I I valve line-up to be correct. Although I don't recall exactly when, venting operations occurred during a sequence of pump starts and_ stops. While the pump was running, the strainer blow down valve was opened. I observed

  • a continuous low pressure stream of water during a purge of about 5 minutes.

During that time the gauge test connect~on isolation valve was also opened. I observed a low pressure stream of water. The jacket cooling water return felt warm to the touch. I was unable to hear any pump flow noise. After I venting, we directed *Eo*ito trip the pump. i I went with SF* 1J to the motor control center where we racked out the 2/3 DGCWP_unit 2 breaker. We -_ I directed __ EO& 1 to restart the pump and he reported observing pump running indication and that there was no cooling *water pressure increase at the DG h-eat exchanger. The pump was tripped and the 2/3 diesel was declared inoperable. A short time later the surveillance of the number 3 DG began. I was in the Crib House with s E

  • 1 r near the 2 I 3 DGCWP.

I was notified by the Control Room of a number 3 DG trouble alarm and also the high temperature alarm and _tHe cooling water pump failure. I observed the number 3 DGCWP which did not appear to be running. About then, SF' ~ i

arrived at the Crib House.

We directed E~ it !*)to start the number 3 DGCWP and observed no increase in pump discharge pressure, .and no pump flow noise. The pump was vented and I observed a low pressure stream of water. About then, the pump stopped for no apparent reaso_n. Approximately 10 to 30 seconds later, the pump restarted for no apparent reason. Shortly afterwards, I observed pump discharge pressure to increase and heard considerable cavitation, After several seconds, the pump

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\\ reached normal pressure and had normal flow noise. The cooling water. pressure at the number 3 DG heat exchanger was reported to be normal. I left the Crib House and walked down the unit 3 DG cooling water piping up to the unit 3 DG Room and I also walked down the 2/3 DG cooling water piping to the 2/3DG. Afterwards I proceeded to the number 3 DG room. The number 3 DGcwP was tripped, and after assuring that it was less than 15 minutes since the diesel was shut down, a DG hot restart was attempted. L The number 3 DGCWP and DG operated normally. Sometime later. E061}reported that he went to the 2/3 DG room and tried to start the number 2/3 DGCWP. It appeared to operate normally and he reported observing an increase in cooling water pressure at the number 2/3 DG heat exchanger. I have read the foregoing statement consisting of 3 typewritten pages. I have made any necessary corrections and have initialed them. I have signed my.name in the margin of each page. This statement is the truth to the best of my knowledge a~d belief. I declare under penalty of perjury that the foregoing is true and correct. Executed on )JDv 5' J'iglat /Soo Interviewee: Subscribed and sworn to before me this day of november, 1981, at Dresden Nuclear Power Station, Morris, Illinois Investigator: tilft1flJJ/. $.((.~ a9~e t M. Burton. Witness: ~(/@rf-... .. * ~. -r-'eii A. Lawsotl, tl'uclear Station Of'erate D. . Scott, Station Superintendent

. I, E.O -ik 2. LOCATION: Dresden Nuclear Power Station Morris; Illinois DATE: Now~mber z4) Jq'6 I TIME: tz=o3p.m. _, hereby make the following voluntary statement to Robert M. Burton, who has identified himself to me as an Investigator with the United States NucJ.ear Regulatory Commission. I make this statem~nt \\~ I freely with no threatJs--~~ promises of. reward having been made to me. *In"'-

  • vestigator Burton.has had this statement typed for me at my request.

. I.. (in +Ninin1). . / I.state I am employed as an Equipment OperatorAat toe Dresde~ Nuclear Power I Station and have held this position since March 1 IC'f'bO

  • ion October 23, 1981, at approximately 2:00 a.m., we were in the 2/3 diesel generator (DG) room conducting surveillances.

The 2/3 DG was started at 2:20 a.m. We ob-served normal air motor operation, normal DG start, and normal start of the diesel generator cooling water pump (DGCWP). After taking some initial log readings, we (: E.0* 1~ Tr~"anee, il ir .. ~ I ~ and I) left the DG room. A short time later, we were notified by radio that the 2/3 DG had tripped. We re-turned to the 2/3 DG room and observed: the DG engine high temperature alarm red light and DGCWP failure/pull to lock alarm, the 2/3 DGCWP off light (Unit 2 supply, green light and Unit 3 supply green light), low cool-ing water pressure at the DG heat exchanger (HX), and.that the diesel engine I was shut down. £oil:i/~tarted DGCWP and*I put my hand on the CW piping and I r-t~ ~l .,..... ~rr** it did not feel like there was any flow in the pipes!\\ _The Shift Foreman I SF ~;2. / ,1 arrived and told* us to* secure the D_GCWP, after which he left for the Crib House. He telephoned us from the Crib House and requested that we start the DGCWP. We did, and observed no differential pressure (DP) at the DG HX.

j. We manually tripped the DGCWP at' the request of._SF *J.. and though I am not certain, I believe we manually started and tripped the DGCWP approximately two more times before it was decided to declare. the pump inoperable..We then pre-proceeded to the Unit 3 DG room to commence operability testing of the Unit 3 DG. We requested that the Unit 3 DG be manually started from the Control Room..

  • We observed a normal DG start, DGCWP start, but there was no increase in DGCWP pressure at the DG RX, and the cylinder head temperature was increasing above normal.

We called t1Te control room and requested that they immediately tripped the Unit 3 diesel/gen. because of no cooling water flow. A *few seconds later the DG tripped on engine high cooling H20 temperature.*.We observed the engine high temp. Eoikl 1then alarm and no other alarms, DGCWP. running indication (red light). M4,* \\ amnually secured the DGCWP. by reques_t of the foreman. We were then requested by the Shift Foremen, who were in the Crib House,. to start the Unit 3 DGCWP. A total of 2:-3 pump starts and stops were manually performed. During the third pump run, we noticed an increase in DGCWP pressure at the DG HX~ .. \\ Pressure increased to normal val~s:. The Shift Foremen (SF s ~ \\ ~ ~al r returned to the DG room, observed DGCWP pressure and decided to attempt a hot restart of the Unit 3 DG. The Shift Foremen requested us to manually trip the '\\,_... DGCWP in order to observe DGCWP automatic start with . \\ ..) eontr~..:r.atoro to manually trip the DGCWP in theDG_. We~* order to observe DGCWP automatic start with the DG. We requested the Control Room operators to manually start the Unit 3 DG. The DG was successfully started and.the sur-veillance completed without further incidenL Later we ran the 2/3 DGCWP and observed normal DGCWPpressure at the 2/3 DG HX. I have read the foregoing statement consisting of 2 lfJ~J~ffitten pages. I have made and initialed any necessary corrections and have signed my name in ink in the margin of each page. this statement is the truth to the best of my knowledge and belief. I declare under penalty of perjury that the foregoing is true and correct. Executed on at 12: It/ f* m

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I Interviewee: Subscribed and sworn to before me this 2¥Ttt day of November, 1981, at Dresden Nuclear Power Station, Morris, Illinois. Investigator:

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Robert M. Burton Wifoess: /]11~ J,j3y*,P- ~ I Seett-atatiaR St:tpetintendent M - M, i,k, 1-'?-M.e;n_

~' LOCATION: Dresden Nuclear Power Station Morris, Illinois 60450 DATE: J.;'ov S 11 ~I I TIME: 1 :oo f>.1"1. I, Eo -#. 1 } hereby make the following voluntary statement to Robert M. Burton who has identified himself to me as an Investigator with the United States Nuclear Regulatory Commission. I make this statement freely with no threats or promises of reward having been made to me. Investi-gator Burton has had this statement typed for me at my request. I am employed as an Equipment Operator at the Dresden Nuclear Power Station in Morris, Illinois, and have held that position since March, 1981. On Friday, October 23, 1981, at approximately 2:20. AM, I was conducting a l I su~veillance with Eo tk ~ /and Tralf\\e& 41 / on 2/ 3 Diesel Generator (D. G.) in the 2/3 D.C~ Room. I called the Control Roo~ and requested that the D.G. be started_. Approximately 4 or 5 minutes after leaving the D. G. Room, I was informed that the D.G. had tripped. . ) I I returned t.o the D. G. Room with EO ~~ /and Tr-,.a~ t:l j_ \\ and observed the D.G. Hi Temp. Alarm, the 2/3 Diesel Generator Cooling Water Pump (DGCWP) Failure/Pull-to-Lock Alarm, and the DGCWP *unit 2 pump running indication_. The pump trip/puli-to..:.lock alarm would not reset. I noticed abnormally low cooling water pressure at the D.G. Heat Exchanger (HX). I manually tripped the DGCWP. I then manually restarted the DGCWP. It tripped by itself, and I started it again. The alarm would reset after the pump was running. The DGCWP ran until the Shift Foremen, SF ti-;}_ ~and 5F fl 1 arrived and instructed me t-o trip the DGCWP which I did. Later I was called by

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r the Shift Foremen, who had gone to the Crib House and was instructed to start the DGCWP. I started the DGCWP and observed no CW pressure increase at the DG RX. The Foreman decided to try the U-3 feed in case of a unit 2 feed breaker failure. They told me about their plan, and then called me in the D/G Room when the Unit 2 feed breaker had been racked out. i then restarted the DGCWP as instructed by the Shift Foreman. The Cooling water pressure remained abnormally low. I was instructed to manually trip the pump, which I did. The 2/3 DGCWP was declared inoperable. Subsequently the surveillance test of the unit 3 (U-3) diesel.was initiated. Similar observations of abnormally low CW pressure at the DG RX resulted in the decision to manually trip the U-3 DG from the Control Room. While the DG was on its 5 minute cooldown run, it automatically tripped on Hi temperature. The U-3 DGCWP also tripped automatically. Though it is not clear in my' mind, I recall ~hatA~ had manu~lly started and trippe4 the U-3 DGCWP several times B<>*H E.C>.,..;t/tlwO f at the request' of the ::>n::i..ft Foremen'. I seem to recall that E'06~ ;' who

  • was.working with me, noticed that the pump had spurriously started.

I have read the foregoing statement consisting of 2 typewritten pages. I* have made any necessary corrections and have initialed them. I have signed. my name in the margin of each page. This statement is the truth to the best of my knowledge and belief. I declare under penalty of perjury that the A/ e.L - 5 1981,.,f 1,:0,,..,.1*.s,* Ill/110/s

  • foregoing is true and correct.

Executed on !WV ~r 1 n 11 Interviewee: L I Subscribed and sworn to before me this.E;Ht day of November, 1981, at Dresden Nuclear Power Station, Morris, Illinois Investigator: f?tHftif 1;( &£17:ii..1 Lt M. Bur 1ton v Witness: Sc~ 6-~ St~hen A. Lawson, Nuclear Operator ,S EV~N ~

I-; ' I). .* ---- --. *- -----1 . - J I, SF A.1. LOCATION: Dresden Nuclear Power Station Morris, Illinois DATE: ~ O\\l, 5., '°' ~ \\ TIME: \\ ~~C) '4~S. \\

, hereby make the fo1lowing voluntary statement to Robert M. Burton, who has identified himself to me as an Investigator with the United States Nuclear Regulatory Counnission.

I make this state-merit freely with no threats or promises of reward having been made to me. Investigator Burton has had this statement typed for me at my request. I am employed as a Shift Foreman at the Dresden Nuclear Power Station in Morris, Illinois and have held this position since January, 1980. On October 23, 1981 at approximately 0230, I was contacted by Control Room personnel and advised that a 2/3 diesel generator trouble alarm had been received. I went to the 2/3 Diesel Generator. (DG) room and observed the engine was off and the high temperature trip alarm was on. I also observed that the DG cooling water pump uni.t 2 breaker indicated closed, and the pump indicated running. I.was either told by the auxilliary operator or observed the cooling water pump *failure or "pull to lock light". *SF :i ~ \\ and I directed EO**-~j_-** --.. :*/0 trip the cooling water pump and remain there. . land I proceeded to the Crib House with a. "B" man, B*MIVJ ti i assist if there was a fire. When we arrived at the Crib.House, we checked the suction valve line-up and visually determined that all valves were positioned correctly. We opened the strainer blow down valve on the 2/3 diesel generator cooling water pump (DGCWP) and observed a low pressure stream of water. We contacted f:O il 1 ivia radio and instructed him to restart the 2/3 DGCWP. We could not determine that the pump was running while we were standing next to it and did not hear any sounds emanating from the pump.

Placing my flashlight on the pump casing and using it to amplify, I put my ear up to the flashlight and heard what I believe was rotation of the .. e. \\ \\ impell,¢r. - Next, while the pump was running, I reopened the strainer blow down valve and again observed a low pressure stream of water. At about the same time, I also opened the.vent valve with similar results. Based on my observations, I was fairly certain that no significant quantity of air was released by venting the pump. I also observed that the pump was n.ot developing significant discharge head. I called EQ *1 } and in-structed him to trip the 2/3 DGCWP. SF #..:2 i~nd I discussed the pump mal-I function and possible reasons for the malfunction.* We called E.Otl'Ji again structed him to manually start the 2/3 DGCWP. During this pump run served the same symptoms as before, with the addition of the motor jacket cooling water return line feeling warm to the touch. We contacted . I

  • *eo* 1 and instructed him to trip the pump.

I went to the motor control center and racked out the number 2/3 DGCWP unit 2 breaker. I again called

  • -fotk~ and told him to start the pump.

I then proceeded to the Control . I Room. EO 41.1 \\eported no increase in pressure at the heat exchanger, and I directed fo*i.:to trip the pump. I then went to the motor control center and racked in the 2/3 DGCWP unit 2 breaker. I returned to the Control Room . caucased with the Shift Control Room Engineer and Shift Engineer, and the 2/3 diesel generator was declared inoperable. In accordance with the Technical Specification requiremeatsj~arted to perform a surveillance of the unit 3 diesel generator. Suhsequently the Control Room in-diesel generator trouble alarm had beeri received. As I I

  • Ii'*

J proceeded** to the unit 3 diesel generator, E0-1'.reported Via radio, that a high temperature alarm had been received.. I instructed the Control Room .JllflJJi1JJ' r1 Operator to trip the unit 3 diesel generator pjzor to my arrival at the diesel generator room. When t arrived at the unit 3 diesel generator room, I / Eo* ;;l,and E'O tl.1: were already there. I observed that the deisel generator I was off and concluded the same malfunction which occurred in the 2/3 DGGWP system, had occurred here. I did not direct that the pump be tripped. Upon arriving at the Crib House, I went to the number 3 DGCWP and observed . that the pump was apparently tripped.* \\ °'""' \\ I opened the pump discharge pressure. g~ge isolation valve and observed no indications of increase in pressure \\ ~~ ~u on the gktage *. I opened the DGGWP discharge pressure.g'tt&ge test connection ) (vent) and observed a low pressure water stream. SF*~.[opened the strainer blow down valve and we observed the same type low pressure water stream. Then, spuriously, the pump started; ran for approximately 15 seconds, and stopped. I observed no increase in water flow from the strainer blow down valve during the pump run. Then spuriously, the pump started again. I heard a lot of cavitation noise and observed an increase in discharge pressure. At about that time I seem to recall that E.O iil reported the~e I was no increase in pre~sure at the unit 3 diesel generator heat exchanger. I proceeded to walk down the unit 2 cooling water piping from the DGCWP.

  • to the unit 2 diesel generator and observed normal pressure at the diesel generator heat exchanger.

I instructed E£>A1to trip the unit 3 DGGWP, which he or tr~:"'ge B-1 did. Subsequently, I instructed f0'-1 to restart

The unit 3 DGCWP. The pump was started and pressure was observed to be normal at the unit 3 diesel generator heat exchanger *.. SF" *..:l /also returned to the unit 3 diesel generator and we decided to perform a hot restart of the unit 3 diesel generator. The unit 3 DGCWP was manually tripped to allow us to observe that the.pump automatically started with the diesel generator. The unit 3 diesel generator was started and pressure. at the diesel generator hea*t exchanger was observed to be normal. I then returned to the Control Room, and I believe that some time later E.Ot::ki :'called and reported he had run the 2/3 DGCWP and it operated normal-ly. I. instructed Eo*i\\ to run the unit 2 DGCWP and was later informed that it also performed acceptably. I have read the foregoing statement consisting of 4 typewritten pages. I have made any necessary corrections and have initialed them. I have signed my name in the margin of each page. This statement is the truth to the best of my knowledge and belief. I declare under penalty of perjury that the foregoing is true and correct.. -Executed on No~ember __ ~J l'l~I at Morris Illinoi Interviewee:

  • 1 ***

I I Subscribed and sworn to before me this 5TH-day of November, 1981, at Dresden Nuclear Power Station, Morris, Illinois Investigator: 6fl/0t,.f-0'. $,(/./'~* Q;~¥*. u~ton Witness~-""-'--~-"fr--+'-*-~L-~.-....~--~~~ ..}}

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