ML19331C549
| ML19331C549 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 07/24/1980 |
| From: | Finfrock I JERSEY CENTRAL POWER & LIGHT CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-80-17, NUDOCS 8008190032 | |
| Download: ML19331C549 (8) | |
Text
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OYSTER CREEK NUCLEAR GENERATING STATIOw s
N'".,c* 7 f g f j gElwc vium sWem (609) 693-1951 P.O. BOX 388
- FORKED RIVER
- 08731 July 24, 1980 Mr. Boyce H. Grier, Director Office of Inspection and Enforcanent Pagion I United States Nuclear Pegulatory Ccmrnission 631 Park Avenue King of Prussia, PA 19406
Dear Mr. Grier:
Subject:
OysterCreekNuclearG[.neratingStation Docket No. 50-219 I.E. Bulletin No. 80-17 The subject bulletin required certain testing pertinent to the Scram Discharge Volume (SDV) to determine adequacy of the SDV and to provide measures to assure its continued adequacy during plant operation. For the purpose of conciseness and clarity, items contained in the bulletin will not be repeated in this response, but data and responses will be referenced to the item number and letter designation.
ITEM 2 The manual and autanatic scram tests were perfonned on July 16 and July 19, 1980 respectively. Plant conditions prior to scram were as.follows:
MWt N 315 Pressure N 1003 Control RTxi Pattern -
Groups 1 thru 10 at 48 (constitutes >50% control rods fully withdrawn)
Group 11 at 24 Group 18 at 30 Group 21 at 16 Rx Water Level = 75" (Yarwny)
Recire. Temp. = 532 F.
Turbine Generator off line with steam flow through the bypass valves
'Ihe results of the testing as they apply to the bulletin are listed below on an item by itcm basis for both the nunual scram and the autanatic scram.
8008100 DM
Mr. Boyce H. Grier, Director 2
July 24, 1980 MANUAL SCRAM AUIO SCRAM a)
Control Pod Scram Times See Attachment #1 b)
All. scram solenoid valve buses deenergized at scram signal YES YES c)
Scram valve air relieved and no pressure buildup until after scram reset YES YES d)
Scram Instrument Volune Fill Titre (Secs)
High level Alarm 22.44 (1)
Pod Withdrawal Block 26.096 (1)
Scram RPS #1 25.056 (2) 20.6 Scram RPS #2 25.92 23.16 e)
Vent and drain valve opening and closing times Closing Time (seconds)
NCllA 7.00 7.00 d
NCllB 21.85 20.27 NCl2 15.80 15.62 Opening Time (sewnds) l NCllA 4.2 4.0 NCllB 4.0 3.9 NCl2 12.3 11.2 f)
Delay time frcm scram initiation to closure of vent and drain valves (semnds)
NCllA 7.00 7.00 NC11B 21.85 20.27 NCl2 15.80 15.62 g)
Results of analysis of water l
frcm SDV (ppm)
- 1 22.83 33.2
- 2 21.54 26.2 h)
Tinn to drain to: (seconds) l High level Alarm 363.9 373.5 Rod Withdrawal Block (3) 374.2 (3)376.7 Scram RPS #1 84.0 161.0 Scram RPS #2 84.2 81.8
l Mr. Boyce H. Grier, Director 3
July 24, 1980 i)
Pesults of UT eu mination for water in SDV and associated piping No water No water j)
Delay tine of 10K3 (scram reset tiner) seconds 16.44 17.4 k)
Ccmparison of two sets of Data (see Stmmary) 1)
Measure pressure variation with time on scram discharge Maders (See Attachment #2) dvswd A ccmparison of the results of the two sets of data reveals, as expected, similar results. The only item identified as being significantly different was the tine to drain to the high discharge volume water level scram point on RPS #1 during the autcmatic scram testing. It was found the drain time was 161 seconds for the auto scram test as opposed to 84.0 seconds during the manual scram test.
A review of the other drain times shows they are similar. Considering the ntr&er of data points to be evaluated for this specific item was only two the significance of this difference cannot be determined.
The results of the test revealed all ccmponents called upon to function during the scram initiation did so as designed. Control rod insertion times where detennined to be acceptable, and pressure rise on the SDV headers did not reveal any need for concern.
(1) This information not obtained because of recorder failure. This is not a major concern since the whole profile of data was obtained during the manual scram and I
the high water level scram points can be used in themselves to ccmpare fill l
tinn.
(2)
This infonnation obtained via the event recorder as opposed to the recorder I
which had been installed to nonitor it.
(3) This time is not representative of the drain time for actuation of the switch.
The tine obtained was via the annunciator in the control rocm.
The annunciator will not reset until the discharge volume high water level bypass switch is placed into the normal position. Therefore, this tinn represents the annunt of tire after the scram before the operator placed the bypass switch to its normal position.
l
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Mr. Boyce H. Grier, Director 4
July 24, 1980 Item 5 A surveillance procedure and an NDE procedure have been developed to provide the i
necessary instructions to perform an inspection of the scram discharge volume for residual water. The inspection of the scran discharge volute is being perfomed daily until a pennanent monitoring system is installed. Ttis daily inspectica began immediately after the performance of the last scram test on July 19, 1980.
Item 6 a)
Pranpt notification (within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />) will te made when less than full operability is available on the following systems:
Isolation Condenser, Containment Spray System, Standby Liquid Centrol System, and Main Steam Bypass Systan. Surveillance tests and p r,ventative maintenance lasting less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> will not be reported.
c)
A review of the possibility on increasing SICS flow by operation of two pumps was performed. Technical Specification changes and nodifications will be necessary to accanplish two pump operation. Therefore, two pump operation cannot be made possible under a 50.59 change.
An additional response to the reraining items shall follow pending finalization of controlling documents.
l N Ivan R. Finfrock, Jr.
Vice President IRP: pit cc: NRC Office of Inspection and Enforcement Division of Reactor Operations Inspection U.S. Nuclear Regulatory Ccmission Washington, D.C.
20555 (w/ attachments)
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Page 1 of 3 1
Attachment #1 Item 2, a)
Control Rod Insertion Times Position for 71 control rods was monitored during performance of each test. The insertion time to position "00" for each control rod nonitored is tabulated below. The longest insertion time for the manual and autmatic scram was 5.43 seconds and 5.35 seconds for control rod 26-23 respectively.
Insert Tine (seconds)
Control Rod Manual Scram Autmatic Scram 02-23 3.566 3.48 02-31 3.083 3.05 02-35 3.016 3.04 06-11 3.291 3.25 06-19 3.233 3.20 06-27 2.983 3.04 06-35 3.266 3.17 06-43 3.216 3.18 10-07 3.166 3.12 10-15 3.575 3.50 10-23 3.075 2.98 10-31 3.433 3.40 l
l 10-39 3.25 3.13 10-47 3.291 3.24 14-11 3.716 3.45 I
l 14-19 3.525 3.50 14-27 3.45 3.35 14-35 3.08 3.07 14-43 3.57 3.45 18-03 3.48 3.36 18-07 3.54 3.40 m_%
Page 2 of 3 Attach. 41 C a t'd)
Ma:rcl Scram Autcratic Scran 4
)
18-15 3.26 3.15 18-23 3.55 3.51 18-39 3.27 3.21 I
18-47 4.80 3.31 30-51 3.30 3.21 i
22-03 3.38 3.35 22-11 3.57 3.52 22-19 3.69 3.67 22-27 3.17 3.31 22-35 3.91 3.71 l
22-43 3.62 3.67 22-51 3.52 3.56 l
26-07 4.20 5.31 26-15 3.33 3.57 l
26-23 5.43 5.35 26-31 3.56 3.46 26-39 3.74 3.57 26-47 3 15 3.12 i
30-03 3.33 3.39 l
l 30-19 3.44 3.40 l
30-27 3.32 3.43 l
30-35 3.24 3.22 30-43 3.85 3.96 34-03 3.38 3.72 34-07 3.30 3.90 l
34-15 3.SS3 3.70 34-23 3.566 3.925 l
34-31 4.225 3.29 i
Page 3 of 3 Attach. #1 (Cont'd)
Mmual Scram Autcmatic Scram 34-39 3.65 3.36 34-47 3.44 3.45 34-51 3.32 3.28 38-11 3.29 3.31 38-19 3.605 3.27 38-27 3.64 3.51 38-35 3.95 3.636 38-43 2.91 2.91 42-07 3.513 2.47 42-15 3.35 3.16 42-23 3.45 3.36 42-31 3.515 3.49 42-39 3.435 3.28 42-47 4.42 3.42 46-11 3.35 3.28 46-19 3.40 3.38 46-27 3.41 3.41 46-35 3.45 3.38 46-43 3.15 3.09 50-19 3.51 3.27 50-23 3.66 2.74 50-31 3.44 3.36
. ~.
e ATDODETF #2 Itan 2,1)
MANL %L SCPAM Pressure (in psig) recorded in the SDV bandars as a function of time after the scram in the headers are designated by size and location.
(i.e. 4" NN baader located on tra north side of the building and is the ncrthern most bandar.)
TEE EIAPSED AFTER INITIATIN3 THE hMT%L SCPAM (IN Smui)
SDV Header 10 15 20 25 26 27 28 29 30 31 32 33. 34 35 4" NN
.J 34 61 99 119 136 167 201 273 392 634 921 996 99F.
4" NS 20 33 91 98 119 130 153 196 261 393 636 988 1111 1111 6" N 26 46 101 114 131 137 163 212 277 411 636 946 1027 1027 4" SN 15 24 45 75 90 126 144 180 240 330 495 816 975 993 1026 6" S 15 21 33 60 84 102 135 177 225 318 498 792 972 990 1019 4" SS 22 27 42 75 90 114 145 180 234 330 507 801 990 1020 1020 AUICMATIC SCPAM Item 2, 1)
Pressure (in psig) recorded in the SDV headers as a function of time after the scram.
Headers are designated by size ard location.
(i.e. 4" NN is a 4" Pendar located on tPa north side of the building and is tra nortbarn most header.
TIME EIAPSED APIER THE AUITATIC SCPAM (IN SECONDS)
SLv Header 10 15 20 25 26 27 28 29 30 31 32 4" NN 34 43 68 136 170 238 358 580 920 954 954 4" NS 33 65 98 179 195 261 375 603 978 978 978 6" N 32 64 96 160 192 239 367 574 941 973 973 4" SN 16 23 46 124 170 247 371 572 928 990 1005 1005 6" S 23 31 54 122 184 245 367 566 918 990 1003 1005 4" SS 23 31 54 122 184 245 367 574 926 1003 1003 1003
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