ML20215D768
| ML20215D768 | |
| Person / Time | |
|---|---|
| Site: | La Crosse File:Dairyland Power Cooperative icon.png |
| Issue date: | 08/05/1986 |
| From: | Taylor J DAIRYLAND POWER COOPERATIVE |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML20215D753 | List: |
| References | |
| NUDOCS 8610140286 | |
| Download: ML20215D768 (5) | |
Text
C C
D DA/RYLAND hhh[ COOPERATIVE
- PO box 817
- 2615 EAST AVE SO
- LACR (608) 7S8-4000 JAMES W. TAYLOR August 5,1986 Genett Manager PRIORITY U 3fitG W=
- i +I e#z a
f M _._
_J 2_ _ _
Mr. James B. Keppler, Regional Administrator 2
2 U.S. Nuclear Regulatory Commission FILE g 799 Roosevelt Road Glen Ellyn, Illinois 60137
Dear Mr. Keppler:
SUBJECT:
Scram Reduction, La Crosse Boiling Water Reactor We have been concerned over the frequency of scrams at the La Crosse Boiling Water Reactor which, on the average, occur more frequently here than at other boiling water reactors around the country. The La Crosse reactor, as you know, is a highly sensitive " hair-triggered" reactor designed to a one out of two scram logic which, at the time of its design, was consid-ered a safe option. Today, we register concern over frequent challenges to the plant safety an'd shutdown system.
An analysis of the eighteen scrams which occurred in the past eighteen months of operation has been made by the plant staff. In this instance, I felt it appropriate to share with you an internal communication from the plant manager to me in response to a request for details on the scrari causes.
The memorandum speaks for itself.
I want to point out that several actions have been taken and are being taken to correct aging hardware systems, frequent component failures, and causes of personnel error. We have on order at the present time new nuclear instrumentation to replace the one-out-of-two scram logic with two-out-of-four in the power to flow circuit. We expect to install the new instrumentation during the next refueling outage. A new static inverter has been ordered on an expedited basis to arrive in time for replacement during the current outage for repair of the shutdown heat removal piping. Maintenance items are being addressed. Protection of scram solenoids exposed to moisture or other contaminar,ts is being reviewed. The training agenda will be modified to address personnel errors, and continued surveillance of scram causes will be maintained from here.
t On other matters, I'm happy to report resolution of our contentions l
l with the State of Iowa Office of Disaster Services. We have successfully j
negotiated an understanding of their responsibilities and obligations and our willingness to support financially the services provided by the Iowa State Government for nuclear emergency services.
j 8610140286 861003 PDR ADOCK 05000409 P
PDR AUG 7 L986
'f Mr. James B. Keppler -
August 5,1986 Page 2 Our entire training program is ready for accreditation review by INPO weeks head of schedule and, we believe, in a complete and acceptable form.
We have reorganized the upper management level here at Dairyland,.
creating an Operations Division and a Technical and Engineering Services Division out of the former Power Group and System Engineering Group.
John P. (Jack) Leifer will head the Operations Division,- and the Nuclear Plant Manager will report directly to him on administrative and operational matters. The Plant Manager will continue to report to the General Manager on all regulatory and INPO matters. This means that the General Manager will continue his overview of the nuclear plant from both a regulatory and operational standpoint with day to day details being handled by the Assistant General Manager for Operations, Jack Leifer.
' At some time in the near future, we will request a management meeting with you, and we.will come to Glen Ellyn to review LACBWR operations and directions. At that time, you will have an opportunity to meet new people who are directly involved with our nuclear operations.
If you have any questions, comments, or concerns regarding the con-tents of this communication, please let us hear from you. We will respond promptly with the best information available at that time.
Sincerely, JWT/ajm Attachment l
cc: John A. Zwolinski Zack Pate, INPO I
l
g:..'.
c c
p@DA/RYLAND@@[ COOPERATIVE MEMORANDUM August 1,1986 TO: Jim Taylor, DPC General Manager Joe Thie, LACbWR SRC Qiairman FRON: John Parkyn, LACBWR Plant Superintendent
SUBJECT:
Analysis of the Past 18 Months of Scrans at the La Crosse Boiling Water Reactor I have reviewe( the last 18 months of scrans at IACBWR and initiated a data base computer program for future review of a five year history of scrans at IACBWR and what sort of hardware modification would preclude their occurrence. It should be emphasized that in soise cases there are other methods besides hardware modifications which present an alternative path to the hardware modification, however; to determine what would be necessary regardless of practicality, hardware applications only were considered.
The conclusions are that of the 18 scrans in the last 18 months (rate of 12 per year):
- 4 ireidents sould have been avoided by the installation of nuclear instrumentation as currently being constructed by General Electric for j
the La Crosse Boiling Water Reactor and approved as a 1986 capital expenditure. Delivery is scheduled for September of 1986 and installation for March or April 1987. The scrams were caused both by personnel error and by instrumentation spiking on the one out of two logic.
- Removing partial scrans will eliminate four of the scrans in the last 18 months. This is a licensing activity combined with the some hardware modification which will cause an alarm in the Control Room when a low gas or low oil indication is received on a single control rod rather than automatic shutdown. This will require operator evaluation and either repair or eventual plant shutdown for repair.
One of these scrams could also potentially be eliminated by covering terminst strips. The schedule for removal of the partial scram function is the 1987 Refueling Outage.
- heo scrams have been caused by the 1A Static Inverter which is the remaining inverter at IAC3WR having an electro-mechanical transfer switch between its principle and backup source. A new 1A Static Inverter with a static transfer switch which should not only reduce the frequency of transfers between the principle and backup source but make them scram-free should they occur is currently being purchased.
Installation is pleaned for August 1986 depending on delivery.
l wpl.2.40
c c
l
. Analysis of the Past 18 Months of Scrass August 1,1986 Page Three In summary, actions are currently underway at 1ACBWE to deal with 11 of the 18 scrans by hardware replacement or modification. Once this is accomplished, our next priority will be to review feedwater pump control (2 of the remaining 7 scrams) and to analyze the results of studies on aging of scram solenoids (an additional 2 out of 7 scrams). This will leave the cause of three scrans during the last 18 months not under consideration for any additional hardware modification. One of these (trip of offsite breaker) has already had hardware modifications. Another (slow transfer of a breaker to a 2400 volt bus) can only be dealt with through the routine breaker maintenance program and one (burnout of SKl9 relay) cannot be dealt with practically.
As you can see, we have a very intensive program underway and we are very optimistic that with the completion of the modifications already contracted for the plant and the follow-up on the remaining two issues that we can significantly, by the end of 1987 Refueling Outage, reduce our scram frequency.
JDP/las cc: T-Sh Reading l
wpl.2.40
e P WWENT h$1
.CWENT f B4/ I/85 CHAMEL o NALED 700 900N 00e ftANUAL SMUTDWON REPLA N NUrur-- INSTRur4:NTATION pF/ps/95 ftPINE ON MI CNM*EL 5 laEN ftANGC SWTTfN Was O REPLACE DRACLEAR INSTRUMENTATION 9/08/Rm NS 04M# DER. 5 SPINF IN I OF F lor.1C REPLAN NUCLEAR INSTRUNENT ATI(N m/U9/k CI CHM *4LI. f. TURF F ail uRE CAUDING f.PikF REPLACE 94Jia.LAR INSTRUNENTATION LIS/I7/N51.and GA*. PRES $UNF aW ROD 8 OR I?
RF7t M PARTIAL 3 CRAM n//7!,/R'. s> red Nrfit WIRE s'N lasp A FAI.DFI Y THDit:AT!h 8 OW (.AG IFf9M l'ARTIAL SCRAM IO/20/H'* RAD 2 WATFR ltAr Meedtfr.D GAS Pf(SGINF RFI A f RFr*1VE PARTIAL SCRAN F13 /J2/f;d FLfrE RL(MN WitTLL AltitP".TINf6 T.F Al. IldifCII(W ( Lt.W REMOVE PANTI Al. SCRAN OR f:(Nf.H TEkNINMj.
05/13/w. 3 A STATIC INYFNIFR Fall uMF REPLACE IA STAf!C ItWERTER D7/I6/f*. I A STATIC INVF N1FR 1RANSFERRFD TO MACFile SaulHCF REPL ACE I A STATIC INYFRTER D4/27/83 LOW Rf AClOR WATER LFVEL DURINis FFEDPUNP TRANSFFH
- fW FEEDWATER CONTROL SYSTEN DA/27/6t. EyrrSS FF EDWATFH IN.TECTj0N WNil E RESPONDING TO LfM LEVEL REPLACE FEEDPUNP CONTROL LYSTEN(sracP 1 Lair CONTROL) 04/2n/R5 SOLENUID RURNOljf (H ROD I2 NULTjPLE LOGIC ON SCRAN StiLFNO!!K&
07/OR/M Ek+D I2 SCRAN SOLEWO D Cistf. BURNED (WJ1 HULTIPLE L OGIC ON SCRAN S(4.EtFilDS 09/14/85 Fu*.C 3?-I SW 'fFD DURING ffC0RDFR NAINT.
REP 9WE NGNESSENTIAw RCCORDCRS FROM VITAL Pt.WER SUPPLIFS i
03/*.7/06 SLOW TRANSFER ON IB 2400 VAC BUS AREAKER DURING SHUTDOWN NONE WITNOUT NULTIPLE LOGIC ON 24uuV BU~iES 06/22/8e N'Ilv NOT FULL OPEN CIRCUIT SKIS /I RFLAY FAILURE NULTIPLF LOGIC ON HISIV CIRCUIT 10/22/03 DPC ET&N TRIPPED SUPPLY PREAKER DtlRING WINTEHIIING No SAFE NODIFICATION WILL PROTECT SEPARATION OF SUPPLIES g.
ggIAD*%gj w1hs;
- ggg@i 3 l
l l
l i
i 1
i l
l l
t
_. _.. _ _