IR 05000346/1978004
| ML19319C427 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 04/05/1978 |
| From: | Tambling T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Knop R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML19319C425 | List: |
| References | |
| NUDOCS 8002140806 | |
| Download: ML19319C427 (6) | |
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yggTED STATES gas aggg g[g NUCLEAR REGULATORY COMMISSION REGloN lll
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GLEN ELLYN, ILLINOi5 60137 k
April 5, 1978
Docket No. 50-346 MDiORANDLH FOR:
R. C. Knop, Chief, Reactor Projects Section 1
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FROM:
T. N. Tambling, Reactor Inspector i
SUBJECT:
RECORDING INSTRLMENTATION TO RECORD PLANNED / UNPLANNED REACTCR TRANSIENTS, DAVIS-BESSE 1 During a recent inspection (Inspection Report 50-346/78-04), it was brought to the licensee's attention that their ability to continuously record systems temperature and pressure parameters during either planned or un-planned transients appeared to be inadequate. Reference to I&E Bulletin 75-08, was made as a basis for this observation (copy had been sent to the licensee during construction phase for information only and no response was required). The inspector requested a licensee's position.
During an exit interview (Inspection Report 50-346/78-07), a representative of the licensee stated the following position:
1.
They felt that no further action was required on their part.
2.
During normal plant heatups and cooldowns, system parameters are logged from temperature and/or pressure indicating instrumentation to show that Technical Specification requirements are met.
3.
An operator has trend recorders that can be used to follow selected parameters.
4.
The station alarm and trend computer can be used to alarm and printout when selected plant parameters exceed pre-established limits.
5.
This subject had been addressed in 1976 and 1977 with NRR during the pre-license review of the generic issue on over-pressurization protec-tion, reference was made to a letter to J. Stolz from L. E. Roe dated April 7, 1977, serial no. 260.
I have reviewed this letter and it does reference Table 7-8 in the FSAR.S This table lists recording and indicating instrumentation available for readout of system parameters, (copy of table attached).
M Paragraph 11, page 13. Interim Solutions for Enclosure 1.
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-2-April 5, 1978 R. C. Knop
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It was pointed out to the licensee that availability of continuously recording instrumentation was also to their advantage so that there l
would be data to show that unplanned transfents fit pre-analyzed trans-
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ient and/or component cycle limitations. Specific examples cited were the September 24, 1977 sudden depressurization of the reactor system and November 29, 1977 loss of reactor coolant flow. As it happens l
during these events a reacttmeter/ data acquisition system was being I
used at -the time and provided very useful data. The reactimeter will The be returned to B & W at the end of power ascension testing.
licensee did state that they were looking into the feasibility of a data acquisition system but that there were no definite plans.
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The specific areas that the licensee's recording instrumentation appears to be inadequate are:
520-620 F 1.
Reactor coolant loop temperatures are recorded only in the range.
2.
Recorded temperatures are averages of loops.
Pressure wide range recorder is the average of the loops with a maxi-3.
mum pressure of 2500 psig.
4.
Steam generator pressures are not recorded.
5.
Reactor coolant flow is total, not individual loops.
Chart scales and recorder chart speeds are good for only slow transients, 6.
or maximum-minimum points. (not good for time responses).
The consequences of many accidents are time dependent.
Note:
Since it appears that criticalinstrumentationatDavps-Besse1doesnot
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meet the intent of Bulletin 75-08 and Reg Guide 1.97, to aid in deter-mining the cause and consequence of events for post accident investiga-tion, it is recommended that the above information be transmitted to I&E Headquarters for resolution.
jy Reg Guide 1.97 also suggests extended ranges for certain monitored l
It cannot be ascertained as to whether these should parameters.
be recording ranges or over range protection.
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TABLE 7-8
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INFORMATION READOUTS AVAILABLE TO THE OPERATOR FOR MONITORING CONDITIONS IN
RpCTOR, REACTOR COOLANT SYSTD4, CONTAINMENT VESSEL, ECCS SYSTD4S, AND STEAM OENERATOR Indicator Number of Accuracy,
% of Full Indicator l25 Type of Sensor Measured Parameter Readout Channels
_ Indicator Range Scale location Source range neutron level (NI)
B,F,E
10 to 10 cps
A,B,D l10-1 Source range startup rate (NI)
A,F
-1 to 10 dpm
+3 A,B,D Intermediate range neutron-11-3 level (NI)
B,F
10 to 10 amp
+3 A,B,D l10
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-3 Intermediate range neutron
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to 10 0.5 B
level (NI)
E
10
Intermediate range startup rate (NI)
A,F
-1 to 10 dpm
A,B,D Power range neutron level (NI)
A,F h
0 to 125% FP
+2 A,B,D l10 Power range neutron level (NI)
E
0 to 125% FP 10 5 B
l25 Power range neutron level imbalance (NI)
A,F
60 to +65% FP
A,B,D l10 20 RC leop outlet temperature ""
A,F, ANN.
h in each loop 520 620F
+2 A.B.C.D.
520 620F
+2 B,D y
BC unit outlet te.nperature(,(t* '
A,F, h in each loop 520 620F
[2 BD E,F, ANN.
m" RC loop inlet temperature 50-650F.
520 620F
+2 B,D
RC unit inlet temperature A,F, ANN.
520 620F
+2 B,D
AflN.
hC unit average temperature h M b,A,F, RC loop average temperature 520 620F
[2 BD
,E,F, ANN.
RC loop temperature difference A,F, ANN.
O to 70
+2 B,D
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-10 to +10F
+2 B,D RC unit temperature difference A,F, ANN.
0 to TOP O to 2500 psig
+2 A,B,C,D RC loop pressure ** hCa'b)
A,E,F, ANN.
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1700 to 2500 psig A
1 in loop twa 0 to 500 psig
+2 B
l24 A,F, ANN.
0 to 320 in.
+2 B.C D l20 RC loop low range pressure Pressurizer level **
A,E,F ANN
0 to 320 in.
[2
.D.C D l25 Pressurizer level (PS C-^b')
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12 B,D jj,
Prescurizer temperature A,F
0 to 700F 6 A,F, ANN.
k in each loop 0 - 90 x 10 lb/h
+3 A,B,D
g gea RC loop flow
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O - 180 x 10 lb/h
[3 A,B,D C*'
E F.
ANN.
r' h RC total flow Gu Mt
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TABLE 7-0 (Cont'd)
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Indicator Number of Accuracy, Type of Sensor
% of Full Indicator l2 Measured Parameter Readout Channels Indicator Range Scale Location BWST level A,F, ANN.
0-50 ft 11.5 B,D l13
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Steam generator startup range
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level **
A,F, ANN.
P in each loop 0-250 in.
B.C.D Steam generator [operatipgF <-n N h E
ANN.
1 in each loop 0-250 in.
10 5 B,D
25 range level Steam generator operating
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D range level F
2 in each loop 0-250 in.
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Steam generator full range level A, F, ANN.
1 in each loop 0 600 in.
B,D Station electrical distri-bution~
A,C,F
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B,D Auxiliary feedvater status **
C,F, ANN.
1 per loop
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B,C,D
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l10 Containment vessel pressure A,F, ANN.
0-60 paia
+1 B.A.D
0 - 5%
[2 B,D,A 10l13 tContainment vessel hydrogen ** A,F,E, ANN.kF0"'
Containment vessel radiation B,F, ANN.
tt il B.A.D l27 y
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10 - 10 cpm
B,D,Al10l13 20l26 g
tContainment vessel post-accident radiation **
B,F,E, ANN [R*'M 2 w
Containment vessel isolation B,D me C,F 1 per valve
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status Containment vessel temperature A.F,
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B,D B,D SFAS status ##
C.F.
ANh.
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Safety features equipment B,D status ##
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BD
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RPS status "a C,F, ANN.
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B,D SFRCS status ##
C,F
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B HFI system bypass status C
Manual
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B LPI system bypass status C
Manual
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Containment spray system B
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bypass status
"C Core flood system bypass B
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C Manual
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[D status B
dO BWST system bypass status C
Manual
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l23 TABLE 7-8 (Cont'd)
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Indicator Number of Accuracy,
% of Full Indicator l25 Type of Sensor Measured Parameter _
Readout Channels Indicator Range Scale Location Containment air recirculation
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B C
Manual
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system bypass status Containment air cooling sys-B
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C Manual
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tem bypass status Emergency ventilation system
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B l
C Manual
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bypass status Steam generator outlet pressure ""
A,F 1 in each loop 0-1200 psig
B,C,D
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Steam generator outlet F
1 in each loop 0-1200 psig
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D High pressure injection flow"" A.F.
ANN.
2 in each loop 0-500 gpm
E,D pressure
Iaw pressure injecticn (DUR)
flow""
A,F, AN!!.
1 in each loop 0-5000 gpm
B,D
Containment spray flow A,F, ANN.
1 in each loop 0-1500 gpn
B,D
Core flood tank pressure A,F, ANN.
2 in each tank 0-700 psig
B,D Core flood tank level A,
ANN.
2 in each tank 0-14 ft H O
+2 B
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Decay heat pump suction temp.
A, ANN.
1 in each loop 0 h00F
B
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Decay heat cooler cutlet temp. A.
ANN.
1 in each loop 0 h00F
B
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HPI system pump and valve B,D status **
C,F 1 in each loop
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LPI system pump and valve B.D status **
C,F 1 in each loop
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Containment spray pump and 1 in each loop (valves, 2 in each loop)
--
B.D valve status""
C,F B.D Core flood valve status""
C,F, ANN.
1 in each loop
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B,D BWST valve status **
C,F 1 in each loop
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Containment emergency sump B,D valve status"
C,F ANN.
1 in each valve
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--
Containment ai'i recircula-E,D
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g tion fea status""
C,F 1 in each loop
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em R in Y !r na a
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TABLE 7-6 (Cont'd)
l2h Indicator Number of Accuracy,
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Type of Sensor
% of Full Indicator l25 Measured Parameter Readout Char.nels Indicator Range Scale,__
Iocat i o n_.
Contair$ ment air cooling fan
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B,D status **
C,F 1 in each loop
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Emergency ventilation system fan and damper status **
C,F 1 in each loop
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B,D
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Indicator Location Legends: Type of Readout A - Linear scale indicator ANN. - Audiovisual alarm A - System cabinets B - Log scale indicator indication (non-B - Main control boards
25 C - Indicator light Class IE)
C - Auxiliary panel D - Digital indicator D - Station computer.1vintout
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E - Recorder F - Station computer output (this output non-Class IE)
Y Two or more signals are combined to produce the indicated parameter ll Notes:
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k Indications are required surveillance equipment on safety systems for safe shutdown and post-
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accident monitoring and utilize the design criteria listed in section 7.5.2.1 (Readout types
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A, B, and C only).
t Post-accident monitoring by redundant essential sensors with one (1) channel recorded, tt To be determined after full-power operation.
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